| 1. |
- Ananth, S., et al.
(författare)
-
A hidden symmetry in quantum gravity
- 2018
-
Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 2018:11
-
Tidskriftsartikel (refereegranskat)abstract
- The action integral contains more information than the equations of motion. Since it is an integral, changes of the integration variables occasionally also expose symmetries more easily than working directly with the equations of motion. We have previously shown that there are signs of an extended exceptional symmetry for N= 8 supergravity in four dimensions. The symmetry is such that the fields used in the Lagrangian are not representations of the symmetry. Instead one has to add representations to obtain a representation of the extended symmetry group. In this paper we discuss an extended symmetry in four-dimensional gravity which is the “Ehlers Symmetry” in three dimensions. It cannot be spanned by the helicity states of four-dimensional gravity but it can be realised once we treat the helicity states just as field variables of the functional integral, which can be changed like variables in any integral. We also explain how this symmetry is inherent in formulations of N= 8 supergravity in four dimensions through a truncation in the field space to pure gravity. The establishment of these “hidden” symmetries should play an important role in the perturbative behaviour of the quantum theories. Since the method used n this paper is purely algebraic we will not provide any information on the geometric role of these symmetries.
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| 2. |
- Ananth, Sudarshan, et al.
(författare)
-
BMS algebra from residual gauge invariance in light-cone gravity
- 2021
-
Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 2021:11
-
Tidskriftsartikel (refereegranskat)abstract
- We analyze the residual gauge freedom in gravity, in four dimensions, in the light-cone gauge, in a formulation where unphysical fields are integrated out. By checking the invariance of the light-cone Hamiltonian, we obtain a set of residual gauge transformations, which satisfy the BMS algebra realized on the two physical fields in the theory. Hence, the BMS algebra appears as a consequence of residual gauge invariance in the bulk and not just at the asymptotic boundary. We highlight the key features of the light-cone BMS algebra and discuss its connection with the quadratic form structure of the Hamiltonian.
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| 3. |
- Ananth, S., et al.
(författare)
-
Bondi-Metzner-Sachs algebra as an extension of the Poincaré symmetry in light-cone gravity
- 2021
-
Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 2021:7
-
Tidskriftsartikel (refereegranskat)abstract
- We analyze possible local extensions of the Poincaré symmetry in light-cone gravity in four dimensions. We use a formalism where we represent the algebra on the two physical degrees of freedom, one with helicity 2 and the other with helicity −2. The representation is non-linearly realized and one of the light-cone momenta is the Hamiltonian, which is hence a non-linear generator of the algebra. We find that this can be locally realized and the Poincaré algebra extended to the BMS symmetry without any reference to asymptotic limits.
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| 4. |
- Ananth, S., et al.
(författare)
-
E 8 in N= 8 supergravity in four dimensions
- 2018
-
Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 2018:1
-
Tidskriftsartikel (refereegranskat)abstract
- We argue that N= 8 supergravity in four dimensions exhibits an exceptional E 8(8) symmetry, enhanced from the known E 7(7) invariance. Our procedure to demonstrate this involves dimensional reduction of the N= 8 theory to d = 3, a field redefinition to render the E 8(8) invariance manifest, followed by dimensional oxidation back to d = 4.
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| 5. |
- Ananth, S., et al.
(författare)
-
Eleven-dimensional supergravity in light-cone superspace
- 2005
-
Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479 .- 1126-6708. ; 5:5, s. 56-71
-
Tidskriftsartikel (refereegranskat)abstract
- We show that Supergravity in eleven dimensions can be described in terms of a constrained superfield on the light-cone, without the use of auxiliary fields. We build its action to first order in the gravitational coupling constant \kappa, by "oxidizing" (N=8,d=4) Supergravity. This is simply achieved, as for N=4 Yang-Mills, by extending the transverse derivatives into superspace. The eleven-dimensional SuperPoincare algebra is constructed and a fourth order interaction is conjectured.
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| 6. |
- Ananth, S., et al.
(författare)
-
Exceptional versus superPoincaré algebra as the defining symmetry of maximal supergravity
- 2016
-
Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 2016:3
-
Tidskriftsartikel (refereegranskat)abstract
- © 2016, The Author(s). We describe how one may use either the superPoincaré algebra or the exceptional algebra to construct maximal supergravity theories in the light-cone formalism. The d = 4 construction shows both symmetries albeit in a non-linearly realized manner. In d = 11, we find that we have to choose which of these two symmetries to use, in constructing the theory. In order to understand the other “unused” symmetry, one has to perform a highly non-trivial field redefinition. We argue that this shows that one cannot trust counterterm arguments that do not take the full symmetry of the theory into account. Finally we discuss possible consequences for Superstring theory and M-theory.
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| 7. |
- Ananth, S., et al.
(författare)
-
Gravitation and quadratic forms
- 2017
-
Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479 .- 1126-6708. ; 2017:3
-
Tidskriftsartikel (refereegranskat)abstract
- The light-cone Hamiltonians describing both pure (N = 0) Yang-Mills and N = 4 super Yang-Mills may be expressed as quadratic forms. Here, we show that this feature extends to theories of gravity. We demonstrate how the Hamiltonians of both pure gravity and N = 8 supergravity, in four dimensions, may be written as quadratic forms. We examine the effect of residual reparametrizations on the Hamiltonian and the resulting quadratic form.
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| 8. |
- Ananth, Sudarshan, et al.
(författare)
-
Maximal supergravity and the quest for finiteness
- 2018
-
Ingår i: International Journal of Modern Physics D. - 0218-2718. ; 27:14
-
Forskningsöversikt (refereegranskat)abstract
- We show that N = 8 supergravity may possess an even larger symmetry than previously believed. Such an enhanced symmetry is needed to explain why this theory of gravity exhibits ultraviolet behavior reminiscent of the finite N = 4 Yang-Mills theory. We describe a series of three steps that leads us to this result.
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| 9. |
- Ananth, S., et al.
(författare)
-
Yang-Mills theories and quadratic forms
- 2015
-
Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 2015:8
-
Tidskriftsartikel (refereegranskat)abstract
- Abstract: We show that the Hamiltonian of (N=1, d = 10) super Yang-Mills can be expressed as a quadratic form in a very similar manner to that of the (N=4, d = 4) theory. We find a similar quadratic form structure for pure Yang-Mills theory but this feature, in the non-supersymmetric case, seems to be unique to four dimensions. We discuss some consequences of this feature. © 2015, The Author(s).
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| 10. |
- Antoniadis, I., et al.
(författare)
-
Extensions of the Poincare group
- 2011
-
Ingår i: Journal of Mathematical Physics. - : AIP Publishing. - 1089-7658 .- 0022-2488. ; 52:7
-
Tidskriftsartikel (refereegranskat)abstract
- We construct an extension of the Poincare group which involves a mixture of internal and space-time supersymmetries. The resulting group is an extension of the superPoincare group with infinitely many generators which carry internal and space-time indices. It is a closed algebra since all Jacobi identities are satisfied and it has, therefore, explicit matrix representations. We investigate the massless case and construct the irreducible representations of the extended symmetry. They are divided into two sets, longitudinal and transversal representations. The transversal representations involve an infinite series of integer and half-integer helicities. Finally, we suggest an extension of the conformal group along the same line.
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| 11. |
- Belyaev, D., et al.
(författare)
-
The BLG theory in light-cone superspace
- 2010
-
Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 2010:4
-
Tidskriftsartikel (refereegranskat)abstract
- The light-cone superspace version of the d = 3, N = 8 superconformal theory of Bagger, Lambert and Gustavsson (BLG) is obtained as a solution to constraints imposed by OSp(2, 2 vertical bar 8) superalgebra. The Hamiltonian of the theory is shown to be a quadratic form of the dynamical supersymmetry transformation.
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| 12. |
- Bengtsson, Anders, 1988, et al.
(författare)
-
Counterterms in gravity in the light-front formulation and a D=2 conformal-like symmetry in gravity
- 2013
-
Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479 .- 1126-6708. ; 58:5-6, s. 485-501
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper we discuss gravity in the light-front formulation (light-cone gauge) and show how possible counterterms arise. We find that Poincare invariance is not enough to find the three-point counterterms uniquely. Higher-spin fields can intrude and mimic three-point higher derivative gravity terms. To select the correct term we have to use the remaining reparametrization invariance that exists after the gauge choice. We finally sketch how the corresponding programme for N = 8 Supergravity should work.
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| 13. |
- Bengtsson, Anders K.H., et al.
(författare)
-
Uniqueness of superstring actions
- 1984
-
Ingår i: Nucl.Phys.B254 (1985) 625.
-
Tidskriftsartikel (refereegranskat)abstract
- We consider local counterterms to 4-dimensional gravity and 4- and 10-dimensional super-gravity theories in the light-front gauge. With the technique developed, we show that there are no local counterterms other than the lagrangian possible in the superstring thoeries. This is a strong indication that these theories are finite or at least renormalizable to allorders in the perturbation expansions.
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| 14. |
- Berkovits, Nathan, et al.
(författare)
-
Memorial Volume For Stanley Mandelstam
- 2017
-
Bok (övrigt vetenskapligt/konstnärligt)abstract
- Stanley Mandelstam (1928-2016) was one of the most influential and respected particle theorists. Coming as a young chemical engineer from South Africa to study theoretical physics in England, he quickly became a leading physicist in his field. With his deep understanding of quantum field theory, he pioneered the development of the analytic S-matrix theory as well as the path-dependent formulations for quantum gauge theories and for quantum general relativity. They are being actively used for the electroweak theory and having their imprints in lattice gauge theory and loop quantum gravity. Also he elucidated the mechanisms for quark confinement in quantum chromodynamics, constructed non-perturbative bosonization methods in 1+1 dimensions, and proved the perturbative finiteness and ß=0 of N=4 supersymmetric Yang-Mills theory. His work also led to the discovery of dual resonance models, which in turn became superstring theory. He was a leader in these developments, devoting much of his later years to the proof that the theory is perturbatively finite so it can be considered as a contender for the theory of quantum gravity. He was also a very modest and friendly man, impressing everyone with his sharp intellect as well as his humanity. This volume contains essays written by many of his friends and students, including both detailed reports on his scientific achievements as well as personal reminiscences. Also collected in the volume are some selected reprints of Mandelstam's early seminal papers and abstracts of selected papers representing the full spectrum of his contributions.
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| 15. |
- Brink, Lars, 1943, et al.
(författare)
-
60 years of Yang-Mills gauge field theories: C.N. Yang's contributions to physics
- 2016
-
Bok (övrigt vetenskapligt/konstnärligt)abstract
- During the last six decades, Yang-Mills theory has increasingly become the cornerstone of theoretical physics. It is seemingly the only fully consistent relativistic quantum many-body theory in four space-time dimensions. As such it is the underlying theoretical framework for the Standard Model of Particle Physics, which has been shown to be the correct theory at the energies we now can measure. It has been investigated also from many other perspectives, and many new and unexpected features have been uncovered from this theory. In recent decades, apart from high energy physics, the theory has been actively applied in other branches of physics, such as statistical physics, condensed matter physics, nonlinear systems, etc. This makes the theory an indispensable topic for all who are involved in physics. The conference celebrated the exceptional achievements using Yang-Mills theory over the years but also many other truly remarkable contributions to different branches of physics from Prof C N Yang. This volume collects the invaluable talks by Prof C N Yang and the invited speakers reviewing these remarkable contributions and their importance for the future of physics.
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| 16. |
- Brink, Lars, 1943
(författare)
-
A Non-BRST Approach to Gauge Field Theories
- 2005
-
Ingår i: Calimaneste 2004.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Gauge field theory is usually used to describe particles with spins higher than 1/2. The gauge invariance represented in terms of the BRST invariance is often crucial for studying the quantum properties of those theories. Yet there is a another very different formulation sometimes called the light-cone gauge approach or the light-front approach used to study quantum properties, where the only symmetries present in the theory are the Poincar\'e symmetry and perhaps some global external symmetries. There are no unphysical degrees of freedom in the fields. The elementary particles are related to the irreducible representations of the Poincar\'e algebra. In this formulation of quantum field theory one can extend these representations to depend also on a coupling constant. The representations then become non-linear and contain the interaction terms which are shown to have strong uniqueness. Extending the algebra to supersymmetry it is shown that two field theories stick out, N=4 Yang-Mills and N=8 Supergravity and their higher dimensional analogues. I also discuss string theory from this starting point.
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| 17. |
- Brink, Lars, 1943
(författare)
-
A Non-Geometric Approach to 11-Dimensional Supergravity
- 2004
-
Ingår i: Proceedings of the Deserfest: A celebration of the life and works of Stanley Deser.
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- I describe the light-cone gauge formulation of supersymmetric theories. In particular I show the great resemblance of $10$-dimensional superYang-Mills theory and $11$-dimensional supergravity.
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| 18. |
|
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| 19. |
- Brink, Lars, 1943
(författare)
-
Counterterms in Gravity in the Light-Front Formulation and a D = 2 Conformal-like Symmetry in Gravity
- 2012
-
Ingår i: 7th Mathematical Physics Meeting: Summer School and Conference on Modern Mathematical Physics 2012, MPHYS 2012; Belgrade; Serbia; 9 September 2012 through 19 September 2012. ; , s. 67-84
-
Konferensbidrag (refereegranskat)abstract
- In this lecture I discuss gravity in the light-front formulation (light-cone gauge) and show how possible counterterms arise. We find that Poincaré invariance is not enough to find the three-point counterterms uniquely. Higher-spin fields can intrude and mimic three-point higher derivative gravity terms. To select the correct term we have to use the remaining reparametrization invariance that exists after the gauge choice. We finally sketch how the corresponding programme for N = 8 Supergravity should work.
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| 20. |
- Brink, Lars, 1943, et al.
(författare)
-
E7(7) on the Light Cone
- 2008
-
Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479 .- 1126-6708. ; 2008:6
-
Tidskriftsartikel (refereegranskat)abstract
- We use the Cremmer-Julia E-7(7) non-linear symmetry of N = 8 Supergravity to derive its order k(2) on-shell Hamiltonian in terms of one chiral light-cone superfield. By requiring that E-7(7) commute with the super-Poincare group, we deduce to lowest non-trivial order in k, the light cone E-7(7) transformations of all fields of the theory, including the gravition. We then derive the dynamical supersymmetry transformation to order k(2), and express the Hamiltonian as a quadratic form in the chiral superfield.
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| 21. |
- Brink, Lars, 1943, et al.
(författare)
-
E8(8) in Light Cone Superspace
- 2008
-
Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479 .- 1126-6708. ; 2008:7
-
Tidskriftsartikel (refereegranskat)abstract
- We derive the non-linear action of E-8(8) on the constrained chiral superfield in the light-cone superspace with eight complex Grassmann variables. We construct (to lowest order in the coupling) the sixteen dynamical supersymmetries which generate a Hamiltonian with E-8(8) invariance in three space-time dimensions, and show that it has only interactions with even powers of the coupling constant.
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| 22. |
- Brink, Lars, 1943
(författare)
-
From the nambu–goto to the σ-model action
- 2012
-
Ingår i: The Birth of String Theory. - 9780511977725 ; 9780521197908, s. 474-483
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- © Cambridge University Press 2012. Introduction My generation of string theorists was very fortunate. We were there when the first ideas leading up to string theory were proposed, and we were young and inexperienced enough not to ask too deep questions. We could accept working in 26 dimensions of spacetime, even when more experienced people laughed at it (and us). We were not more clever than they were, not at all, rather we became so attached to the ideas that we did not listen to good advice. The average age of the active people was probably well under thirty, and it was one of the rare occasions where a young generation could form its scientific future. There were a number of older heroes, most notably Yoichiro Nambu, Stanley Mandelstam, Sergio Fubini and Daniele Amati. Also, the leading theoretical physicist of those days, Murray Gell-Mann, was sympathetic. His words, always carefully phrased, were listened to by everyone in particle physics. This blend made the field so exciting that once hooked it was difficult to leave it. After some years many had to change field in order to find positions, but most of us had the secret wish to return to this subject. The formative years. I started as a graduate student in 1967. Sweden still had the old system, which meant that there were no graduate schools. You had to study on your own, and you had to work on your own.
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| 23. |
|
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| 24. |
- Brink, Lars, 1943
(författare)
-
Héctor Rubinstein from a swedish prospective
- 2010
-
Ingår i: Hector Rubinstein Memorial Symposium: Quarks, Strings and the Cosmos, HRMS 2010; Stockholm; Sweden; 9 August 2010 through 11 August 2010. - 1824-8039.
-
Konferensbidrag (refereegranskat)
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| 25. |
|
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| 26. |
- Brink, Lars, 1943
(författare)
-
Light-cone field theory, maximal supersymmetric theories and E7 (7) in light-cone superspace
- 2009
-
Ingår i: ; Code 103197 Light-cone field theory, maximal supersymmetric theories and E7 (7) in light-cone superspace(Conference Paper) Brink, L.Email Author View Correspondence (jump link) Chalmers University of Technology, Göteborg, Sweden Abstract View references (27) In this lecture I describe the light-cone formulation of quantum field theories especially the maximally supersymmetric ones. This is a formalism in which we keep only the physical degrees of freedom for both bosons and fermio. - New York, NY : Springer New York. - 9780387874982 ; , s. 33-69
-
Konferensbidrag (refereegranskat)abstract
- In this lecture I describe the light-cone formulation of quantum field theories especially the maximally supersymmetric ones. This is a formalism in which we keep only the physical degrees of freedom for both bosons and fermions. I show how N = 4 Yang-Mills Theory and N = 8 supergravity come out very naturally and that they look very much alike. I finally show how to implement the E7(7)symmetry for the supergravity theory. The new feature in this formulation is that all fields of the supermultiplet including the graviton transform under E7(7).
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| 27. |
- Brink, Lars, 1943, et al.
(författare)
-
Looking Beyond the Frontiers of Science : Dedicated to the 80th Birthday of K.K. Phua
- 2022
-
Bok (övrigt vetenskapligt/konstnärligt)abstract
- Professor Kok Khoo Phua is the Founding Director and Emeritus Professor of the Institute of Advanced Studies (IAS) at Nanyang Technological University (NTU) and Adjunct Professor of Department of Physics both at Nanyang Technological University (NTU) and National University of Singapore (NUS). He is the Chairman and Editor-in-Chief of World Scientific Publishing Co Pte Ltd. When he was elected a Fellow of the American Physical Society (APS) in 2009, the citation read: “For tireless efforts to strengthen scientific research throughout Asia and promote international physics education and scholarly exchanges, and for enriching science and education through the World Scientific Publishing Co. he founded.” This unique volume on the occasion of his 80th birthday is a compilation of tributes from his friends who have known him for decades along with scientific articles that celebrate his visionary approach to promote science worldwide.
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| 28. |
- Brink, Lars, 1943
(författare)
-
Maximal supersymmetry and exceptional groups
- 2010
-
Ingår i: Modern Physics Letters A. - 0217-7323. ; 25:32, s. 2715-2725, s. 262-272
-
Tidskriftsartikel (refereegranskat)abstract
- The article is a tribute to my old mentor, collaborator and friend Murray Gell-Mann. In it I describe work by P. Ramond, S.-S. Kim and myself where we describe the N = 8 supergravity in the light-cone formalism. We show how the Cremmer-Julia E-7(7) nonlinear symmetry is implemented and how the full supermultiplet is a representation of the E-7(7) symmetry. I also show how the E-7(7) symmetry is a key to understand the higher order couplings in the theory and is very useful when we discuss possible counterterms for this theory.
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| 29. |
- Brink, Lars, 1943
(författare)
-
Maximal supersymmetry, light-front dynamics and exceptional symmetries
- 2011
-
Ingår i: Annals of the University of Craiova, Physics. - 1223-6039. ; 21:1, s. 145-153
-
Tidskriftsartikel (refereegranskat)abstract
- In this talk I describe some recent work by Kim, Ramond and myself where we formulate N = 8 Supergravity in the light-front form. In this form the E 7(7) symmetry, which in the covariant formulation is just a duality symmetry and a non-linear σ-model symmetry in the bosonic fields at the level of the equations of motion, is shown to be a genuine symmetry much like the SuperPoincaré symmetry and it is found that they are spanned on the same multiplet. Hence in this formulation the E 7(7) symmetry transforms all the physical degrees of freedom. Finally I argue that this formalism is well suited to discuss possible counterterms in order to examine the divergence properties of the perturbation expansion, a much discussed issue these days.
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| 30. |
- Brink, Lars, 1943
(författare)
-
Maximally Supersymmetric Yang-Mills in five dimensions in light-cone superspace
- 2012
-
Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 1012, s. 059-
-
Tidskriftsartikel (refereegranskat)abstract
- We formulate maximally supersymmetric Yang-Mills theory in five dimensions in light-cone superspace. The light-cone Hamiltonian is of the quadratic form and the theory can be understood as an oxidation of the N=4 Super Yang-Mills Theory in four dimensions. We specifically study three-point counterterms and show how these counterterms vanish on-shell. This study is a preliminary to set up the technique in order to study possible four-point counterterms.
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| 31. |
- Brink, Lars, 1943, et al.
(författare)
-
Maximally Supersymmetric Yang-Mills in five dimensions in light-cone superspace
- 2010
-
Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708.
-
Tidskriftsartikel (refereegranskat)abstract
- We formulate maximally supersymmetric Yang-Mills theory in five dimensions in light-cone superspace. The light-cone Hamiltonian is of the quadratic form and the theory can be understood as an oxidation of the N=4 Super Yang-Mills Theory in four dimensions. We specifically study three-point counterterms and show how these counterterms vanish on-shell. This study is a preliminary to set up the technique in order to study possible four-point counterterms.
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| 32. |
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| 33. |
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| 34. |
- Brink, Lars, 1943, et al.
(författare)
-
N=8 superconformal algebra and the superstring
- 1993
-
Ingår i: Phys.Lett.B311 (1993) 76.
-
Tidskriftsartikel (refereegranskat)abstract
- The superstring in D=3,4 and 6 is invariant under an N=D-2 superconformal algebra based on S^{D-3}. There is a direct relationship between this (world-sheet) symmetry and the super-Poincaré (target space) symmetry. We establish this relationship using the light-cone gauge, show how the statement generalizes to D=10 and examine the properties of the N=8 superconformal algebra and the possible implications of its existence.
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| 35. |
- Brink, Lars, 1943, et al.
(författare)
-
Non-linear realization of PSU(2,2|4) on the light-cone
- 2005
-
Ingår i: Nuclear Physics B. - : Elsevier BV. - 0550-3213. ; 722:1-2, s. 166-190
-
Tidskriftsartikel (refereegranskat)abstract
- The symmetries of the N=4 SuperYang-Mills theory on the light-cone are discussed, solely in terms of its physical degrees of freedom. We derive explicit expressions for the generators of the PSU(2,2|4) superalgebra, both in the free theory, and to all orders in the gauge coupling of the classical theory. We use these symmetries to construct its Hamiltonian, and show that it can be written as a quadratic form of a fermionic superfield.
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| 36. |
- Brink, Lars, 1943
(författare)
-
OXIDIZING SUPERYANG-MILLS FROM (N=4,D = 4) TO (N=1,D = 10).
- 2004
-
Ingår i: JHEP. ; 0407, s. 82-
-
Tidskriftsartikel (refereegranskat)abstract
- We introduce superspace generalizations of the transverse derivatives to rewrite the four-dimensional N=4 Yang-Mills theory into the fully ten-dimensional N=1 Yang-Mills in light-cone form. The explicit SuperPoincare algebra is constructed and invariance of the ten-dimensional action is proved.
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| 37. |
- Brink, Lars, 1943
(författare)
-
PARTICLE PHYSICS AS REPRESENTATIONS OF THE POINCARE ALGEBRA.
- 2005
-
Ingår i: Symposium Henri Poincare, Brussels 2004.
-
Konferensbidrag (refereegranskat)abstract
- Eugene Wigner showed already in 1939 that the elementary particles are related to the irreducible representations of the Poincare algebra. In the light-cone frame formulation of quantum field theory one can extend these representations to depend also on a coupling constant. The representations then become non-linear and contain the interaction terms which are shown to have strong uniqueness. Extending the algebra to supersymmetry it is shown that two field theories stick out, N=4 Yang-Mills and N=8 Supergravity and their higher dimensional analogues. I also discuss string theory from this starting point.
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| 38. |
- Brink, Lars, 1943, et al.
(författare)
-
Preface
- 2022
-
Ingår i: Looking Beyond the Frontiers of Science: Dedicated to the 80th Birthday of K.K. Phua. - : WORLD SCIENTIFIC. ; , s. v-vi
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 39. |
- Brink, Lars, 1943, et al.
(författare)
-
Preface - Topological phase transitions and new developments
- 2018
-
Ingår i: Topological phase transitions and new developments. ; , s. v-vi
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Geometry and topology have been a fascination in physics since the start of the 20th century. A leading example is Einstein's geometrical theory of gravity. At the beginning of the 1970s, topological ideas entered areas of condensed matter physics. These advances were driven by new seminal ideas resolving a serious contradiction between experiment and the standard interpretation of a rigorous mathematical theorem which led to the study of new exotic topological phases of matter. Topological defect driven phase transitions in thin, two dimensional films of superfluids, superconductors and crystals have provided great insight into the mechanism governing these topological phases present in those physical systems. Moreover, many of these topological properties remain 'protected' against disorder and topological distortion perturbations. An example of possible applications of such robustness to perturbations is in the search for encoding information in quantum computers, potentially providing the platform for fault-tolerant quantum computations. In the past four decades, the discovery of topological phases engendered great interest in condensed matter physics. It also attracted the attention of researchers working on quantum information, quantum materials and simulations, high energy physics and string theory. This unique volume contains articles written by some of the most prominent names in the field, including Nobel Laureate John Michael Kosterlitz and Professor Jorge V José. They originate from talks and discussions by leading experts at a recent workshop. They review previous works as well as addressing contemporary developments in the most pressing and important issues on various aspects of topological phases and topological phase transitions.
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| 40. |
- Brink, Lars, 1943
(författare)
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Some reminiscences from a long friendship
- 2016
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Ingår i: Progress of Theoretical and Experimental Physics. - : Oxford University Press (OUP). - 2050-3911. ; 2016:7
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Tidskriftsartikel (refereegranskat)
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| 41. |
- Brink, Lars, 1943
(författare)
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Stanley Mandelstam and me and life on the light-cone
- 2017
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Ingår i: International Journal of Modern Physics A. - 0217-751X. ; 32:1
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Tidskriftsartikel (refereegranskat)abstract
- Stanley Mandelstam has always been one of my heroes in physics. Here I will describe my meetings with Stanley over the years and how our respective work sometimes coincided.
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| 42. |
- Brink, Lars, 1943
(författare)
-
Stanley Mandelstam and me and life on the light-cone
- 2017
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Ingår i: Memorial Volume For Stanley Mandelstam. - : WORLD SCIENTIFIC. - 9789813207851 ; , s. 97-111
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Stanley Mandelstam has always been one of my heroes in physics. Here I will describe my meetings with Stanley over the years and how our respective work sometimes coincided.
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| 43. |
- Brink, Lars, 1943, et al.
(författare)
-
String field theory with chiral coordinates
- 1987
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Ingår i: Nucl.Phys.B293 (1987) 114.
-
Tidskriftsartikel (refereegranskat)abstract
- Interesting string theories, such as the heterotic string, involve chiral coordinates, that is coordinates which are either right-moving or left-moving on the world sheet. In this paper the field theoretic formulation of such theories is studied with most emphasis on the light-cone gauge method although the main techniques would also apply in the various covariant approaches to string field theory. In the heterotic string the internal symmetry is described in terms of eight left-moving complex bosonic coordinates in a manner which parallels the treatment of fermionic Grassmann coordinates. The wave functions, and hence the free string fields, are described in these coordinates and the three-string interaction is derived from the requirements of supersymmetry and Lorentz invariance both in its functional form and in terms of its oscillator modes.
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| 44. |
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| 45. |
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| 46. |
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| 47. |
- Brink, Lars, 1943
(författare)
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The nobel prize in physics 2013 the BEH - Mechanism, interactions with short range forces and scalar particles
- 2014
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Ingår i: Proceedings of Science. - 1824-8039. ; 2014-September
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Konferensbidrag (refereegranskat)abstract
- On July 4, 2012, CERN announced the long awaited discovery of a new fundamental particle with properties similar to those expected for the missing link of the Standard Model (SM) of particle physics, the Higgs boson. The discovery was made independently by two experimental collaborations ATLAS and CMS at the Large Hadron Collider both working with huge all- purpose multichannel detectors. With significance at the level of five standard deviations, the new particle was mainly observed decaying into two channels: two photons and four leptons. This high significance implies that the probability of background fluctuations conspiring to produce the observed signal is less than 3×10 -7 . It took another nine months, however, and dedicated efforts from hundreds of scientists working hard to study additional decay channels and extract pertinent characteristics, before CERN boldly announced that the new particle was indeed the long-sought Higgs particle. Today we believe that "Beyond any reasonable doubt, it is a Higgs boson." [1]. An extensive review of Higgs searches prior to the July 2012 discovery may be found in [2] .
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| 48. |
- Brink, Lars, 1943, et al.
(författare)
-
Topological Phase Transitions and New Developments
- 2018
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Geometry and topology have been a fascination in physics since the start of the 20th century. A leading example is Einstein's geometrical theory of gravity. At the beginning of the 1970s, topological ideas entered areas of condensed matter physics. These advances were driven by new seminal ideas resolving a serious contradiction between experiment and the standard interpretation of a rigorous mathematical theorem which led to the study of new exotic topological phases of matter. Topological defect driven phase transitions in thin, two dimensional films of superfluids, superconductors and crystals have provided great insight into the mechanism governing these topological phases present in those physical systems. Moreover, many of these topological properties remain 'protected' against disorder and topological distortion perturbations. An example of possible applications of such robustness to perturbations is in the search for encoding information in quantum computers, potentially providing the platform for fault-tolerant quantum computations. In the past four decades, the discovery of topological phases engendered great interest in condensed matter physics. It also attracted the attention of researchers working on quantum information, quantum materials and simulations, high energy physics and string theory. This unique volume contains articles written by some of the most prominent names in the field, including Nobel Laureate John Michael Kosterlitz and Professor Jorge V José. They originate from talks and discussions by leading experts at a recent workshop. They review previous works as well as addressing contemporary developments in the most pressing and important issues on various aspects of topological phases and topological phase transitions.
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| 49. |
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Memorial volume on Abdus Salam’s 90th birthday
- 2017
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Samlingsverk (redaktörskap) (refereegranskat)abstract
- In honor of one of the most prolific and exciting scientists of the second half of the last century, a memorial meeting was organized by the Institute of Advanced Studies at Nanyang Technological University for Professor Abdus Salam’s 90th Birthday in January 2016. Salam believed that “scientific thought is the common heritage of all mankind” and that the developing world should play its part, not merely by importing technology but by being the arbiter of its own scientific destiny. That belief saw him rise from humble beginnings in a village in Pakistan to become one of the world’s most original and influential particle physicists, culminating in the 1979 Nobel Prize (shared with Glashow and Weinberg) for contributions to electroweak unification, which forms an integral part of the Standard Model. The book collected the papers presented at this memorable event which saw many distinguished scientists participating as speakers to reflect on Prof Salam’s great passion for the science and achievements.
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| 50. |
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Preface
- 2018
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Samlingsverk (redaktörskap) (refereegranskat)
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