| 1. |
- Bah, Ibrahima, et al.
(author)
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AdS(5) compactifications with punctures in massive IIA supergravity
- 2017
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In: Journal of High Energy Physics (JHEP). - 1126-6708 .- 1029-8479. ; :11
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Journal article (peer-reviewed)abstract
- We find AdS(5) solutions holographically dual to compactifications of six-dimensional N=(1,0) supersymmetric field theories on Riemann surfaces with punctures. We simplify a previous analysis of supersymmetric AdS(5) IIA solutions, and with a suitable Ansatz we find explicit solutions organized in three classes, where an O8-D8 stack, D6- and D4-branes are simultaneously present, localized and partially localized. The D4-branes are smeared over the Riemann surface and this is interpreted as the presence of a uniform distribution of punctures. For the first class we identify the corresponding six-dimensional theory as an E-string theory coupled to a quiver gauge theory. The second class of solutions lacks D6-branes and its central charge scales as n(5/2), suggesting a five-dimensional origin for the dual field theory. The last class has elements of the previous two.
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| 2. |
- Bah, Ibrahima, et al.
(author)
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Holographic duals of five-dimensional SCFTs on a Riemann surface
- 2019
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In: Journal of High Energy Physics (JHEP). - 1126-6708 .- 1029-8479. ; :1
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Journal article (peer-reviewed)abstract
- We study the twisted compacti fi cations of fi ve-dimensional Seiberg SCFTs, with SU M (2) ENf+1 avor symmetry, on a generic Riemann surface that preserves four supercharges. The fi ve-dimensional SCFTs are obtained from the decoupling limit of N D4-branes probing a geometry of Nf < 8 D8-branes and an O8-plane. In addition to the R-symmetry, we can also twist the avor symmetry by turning on background ux on the Riemann surface. In particular, in the string theory construction of the fi ve-dimensional SCFTs, the background ux for the SU M (2) has a geometric origin, similar to the topological twist of the R-symmetry. We argue that the resulting low-energy three-dimensional theories describe the dynamics on the world-volume of the N D4-branes wrapped on the Riemann surface in the O8/D8 background. The Riemann surface can be described as a curve in a Calabi-Yau three-fold that is a sum of two line bundles over it. This allows for an explicit construction of AdS 4 solutions in massive IIA supergravity dual to the worldvolume theories, thereby providing strong evidence that the three-dimensional SCFTs exist in the low-energy limit of the compacti fi cation of the fi ve-dimensional SCFTs. We compute observables such as the free energy and the scaling dimensions of operators dual to D2-brane probes; these have non-trivial dependence on the twist parameter for the U(1) in SU M (2). The free energy exhibits the N5=2 scaling that is emblematic of fi ve-dimensional SCFTs.
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| 3. |
- Dibitetto, Giuseppe, et al.
(author)
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AdS(2) x S-7 solutions from D0-F1-D8 intersections
- 2018
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In: Journal of High Energy Physics (JHEP). - 1126-6708 .- 1029-8479. ; :10
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Journal article (peer-reviewed)abstract
- We study an exhaustive analytic class of massive type IIA backgrounds pre-serving sixteen real supercharges and enjoying SL(2, ) x SO(8) bosonic symmetry. The corresponding geometry is described by AdS(2) x S-7 warped over a line, which turns out to emerge from taking the near-horizon limit of D0-F1-D8 intersections. By studying the singularity structure of these solutions we find the possible presence of localized O8/D8 sources, as well as of fundamental strings smeared over the S-7. Finally we discuss the relation between the aforementioned solutions and the known AdS(7) x S-2 class through double analytic continuation.
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| 4. |
- Dibitetto, Giuseppe, et al.
(author)
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AdS3 solutions with exceptional supersymmetry
- 2018
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In: Fortschritte der Physik. - : Wiley. - 0015-8208 .- 1521-3978. ; 66:10
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Journal article (peer-reviewed)abstract
- Among the possible superalgebras that contain the AdS3 isometries, two interesting possibilities are the exceptional F (4) and G(3). Their R-symmetry is respectively SO(7) and G(2), and the amount of supersymmetry N = 8 and N = 7. We find that there exist two (locally) unique solutions in type IIA supergravity that realize these superalgebras, and we provide their analytic expressions. In both cases, the internal space is obtained by a round six-sphere fibred over an interval, with an O8-plane at one end. The R-symmetry is the symmetry group of the sphere; in the G(3) case, it is broken to G(2) by fluxes. We also find several numerical N = 1 solutions with G(2) flavor symmetry, with various localized sources, including O2-planes and O8-planes.
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| 5. |
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| 6. |
- Hosseini, Seyed Morteza, et al.
(author)
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Holographic microstate counting for AdS4 black holes in massive IIA supergravity
- 2017
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In: Journal of High Energy Physics (JHEP). - 1126-6708 .- 1029-8479. ; :10
-
Journal article (peer-reviewed)abstract
- We derive the Bekenstein-Hawking entropy for a class of BPS black holes in the massive type IIA supergravity background AdS(4) x S-6 from a microscopic counting of supersymmetric ground states in a holographically dual field theory. The counting is performed by evaluating the topologically twisted index of three-dimensional N = 2 Chern-Simons-matter gauge theories in the large N limit. The I-extremization principle is shown to match the attractor mechanism for the near-horizon geometries constructed in the four-dimensional dyonic N = 2 gauged supergravity, that arises as a consistent truncation of massive type IIA supergravity on S-6. In particular, our results prove that the imaginary part of the three-dimensional partition functions plays a crucial role in holography.
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| 7. |
- Passias, Achilleas, et al.
(author)
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A massive class of N=2 AdS(4) IIA solutions
- 2018
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In: Journal of High Energy Physics (JHEP). - : SPRINGER. - 1126-6708 .- 1029-8479. ; :10
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Journal article (peer-reviewed)abstract
- We initiate a classification of N = 2 supersymmetric AdS4 solutions of (massive) type IIA supergravity. The internal space is locally equipped with either an SU(2) or an identity structure. We focus on the SU(2) structure and determine the conditions it satisfies, dictated by supersymmetry. Imposing as an Ansatz that the internal space is complex, we reduce the problem of finding solutions to a Riccati ODE, which we solve analytically. We obtain in this fashion a large number of new families of solutions, both regular as well as with localized O8-planes and conical Calabi-Yau singularities. We also recover many solutions already discussed in the literature.
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| 8. |
- Passias, Achilleas, et al.
(author)
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N=2 supersymmetric AdS(4) solutions of type IIB supergravity
- 2018
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In: Journal of High Energy Physics (JHEP). - : SPRINGER. - 1126-6708 .- 1029-8479. ; :4
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Journal article (peer-reviewed)abstract
- We analyze general N = 2 supersymmetric AdS(4) solutions of type IIB super gravity. Utilizing a set of pure spinor equations directly adapted to N = 2, the necessary and sufficient conditions for supersymmetry are reduced to a concise system of partial differential equations for two functions which determine the solutions. We show that using this system analytic solutions can be generated, thus potentially expanding the rather limited set of known AdS(4) solutions in type IIB supergravity.
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| 9. |
- Passias, Achilleas, et al.
(author)
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Perturbing AdS(6) x S-w(4) : linearised equations and spin-2 spectrum
- 2018
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In: Journal of High Energy Physics (JHEP). - : SPRINGER. - 1126-6708 .- 1029-8479. ; :7
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Journal article (peer-reviewed)abstract
- We initiate the analysis of the Kaluza-Klein mass spectrum of massive IIA supergravity on the warped AdS(6) x S-w(4) background, by deriving the linearised equations of motion of bosonic and fermionic fl uctuations, and determining the mass spectrum of those of spin-2. The spin-2 modes are given in terms of hypergeometric functions and a careful analysis of their boundary conditions uncovers the existence of two branches of mass spectra, bounded from below. The modes that saturate the bounds belong to short multiplets which we identify in the representation theory of the f (4) symmetry superalgebra of the AdS(6) x S-w(4) solution.
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