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  • Lestinsky, M., et al. (författare)
  • Physics book: CRYRING@ESR
  • 2016
  • Ingår i: European Physical Journal: Special Topics. - 1951-6401 .- 1951-6355. ; 225:5, s. 797-882
  • Tidskriftsartikel (refereegranskat)abstract
    • The exploration of the unique properties of stored and cooled beams of highly-charged ions as provided by heavy-ion storage rings has opened novel and fascinating research opportunities in the realm of atomic and nuclear physics research. Since the late 1980s, pioneering work has been performed at the CRYRING at Stockholm (Abrahamsson et al. 1993) and at the Test Storage Ring (TSR) at Heidelberg (Baumann et al. 1988). For the heaviest ions in the highest charge-states, a real quantum jump was achieved in the early 1990s by the commissioning of the Experimental Storage Ring (ESR) at GSI Helmholtzzentrum für Schwerionenforschung (GSI) in Darmstadt (Franzke 1987) where challenging experiments on the electron dynamics in the strong field regime as well as nuclear physics studies on exotic nuclei and at the borderline to atomic physics were performed. Meanwhile also at Lanzhou a heavy-ion storage ring has been taken in operation, exploiting the unique research opportunities in particular for medium-heavy ions and exotic nuclei (Xia et al. 2002).
  • Forssen, C., et al. (författare)
  • The Ab Initio No-core Shell Model
  • 2009
  • Ingår i: Workshop on Critical Stability of Few-Body Quantum Systems,Erice, Italy,2008-10-10. - Springer.
  • Konferensbidrag (refereegranskat)abstract
    • This contribution reviews a number of applications of the ab initio no-core shell model (NCSM) within nuclear physics and beyond. We will highlight a nuclear-structure study of the A = 12 isobar using a chiral NN + 3NF interaction. In the spirit of this workshop we will also mention the new development of the NCSM formalism to describe open channels and to approach the problem of nuclear reactions. Finally, we will illustrate the universality of the many-body problem by presenting the recent adaptation of the NCSM effective-interaction approach to study the many-boson problem in an external trapping potential with short-range interactions.
  • Tornsö, Marcus, 1993- (författare)
  • Holographic descriptions of collective modes in strongly correlated media
  • 2019
  • Ingår i: Tillämpad strängteori - holografiska metoder för starkt kopplade system. - Gothenburg : Chalmers tekniska högskola.
  • Licentiatavhandling (övrigt vetenskapligt)abstract
    • Solving the puzzle of high temperature superconductivity may be one of the most desired scientific breakthroughs of our time, as access to room temperature superconductivity could revolutionize society as we know it. In this thesis, we strive to increase the theoretical understanding of such matter, by studying the phase above, in temperature, the superconducting phase - the "strange metal". The strange metal phase is a phase characterized by the absence of a quasi-particle description. The electrons in this phase are strongly coupled, which means that conventional methods, such as perturbation theory in quantum field theory and Monte Carlo methods fall short of being able to describe their dynamics. Perhaps surprisingly, string theory provides a different method, capable of describing precisely such systems - the holographic duality. Whereas there has been significant effort devoted to the applications of the duality since its inception in 1997, and even more so in the last decade after it was observed that it worked remarkably well for condensed matter theory, it wasn't until our project that the dynamical polarization of such strongly coupled systems where properly treated. In this thesis, we introduce the minimal constraints required for a sensible description of a polarizing medium, and convert those to boundary conditions to the equations of motion provided by the holographic dual. These boundary conditions deviate from previous holographic studies, and we contrast the quasinormal modes previously studied with the emergent collective modes we find for some different models. We find novel results, as well as confirm the predictions of less general models in their respective regions of validity and pave the way for more complex future models.
  • Cederwall, Martin, 1961- (författare)
  • An off-shell superspace reformulation of D=4, N=4 super-Yang–Mills theory
  • 2017
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • D = 4, N = 4 super-Yang-Mills theory has an off-shell superspace formulation in terms of pure spinor superfields, which is directly inherited from the D = 10 theory. That superspace, in particular the choice of pure spinor variables, is less suitable for dealing with fields that are inherently 4-dimensional, such as the superfields based on the scalars, which are gauge-covariant, and traces of powers of scalars, which are gauge-invariant. We give a reformulation of D = 4, N = 4 super-Yang-Mills theory in N = 4 superspace, using inherently 4-dimensional pure spinors. All local degrees of freedom reside in a superfield based on the physical scalars. The formalism should be suited for calculations of correlators of traces of scalar superfields.
  • Mårtensson-Pendrill, Ann-Marie, 1952- (författare)
  • The Manhattan Project - a part of physics history
  • 2006
  • Ingår i: Physics Education. - ISSN 0031-9120. ; 41:6, s. 493-501
  • Tidskriftsartikel (refereegranskat)abstract
    • Current physics textbooks tend to exclude military applications, but it is explained here how a study of the Manhattan project—the devastatingly successful attempt to develop an atomic bomb—can show students how the lives and work of physicists are shaped by events in society. Much of the original source material is available in books and on the internet (and referenced here), which allows students to discover the views of the scientists for themselves.
  • Johannesson, Henrik, 1953-, et al. (författare)
  • Conformal field theory approach to the two-channel Anderson model
  • 2004
  • Ingår i: Journal of Magnetism and Magnetic Materials. - 0304-8853. ; 272-276:SUPPL. 1
  • Tidskriftsartikel (refereegranskat)abstract
    • The two-channel Anderson impurity model serves as a prototype for describing heavy-fermion materials with a possible mixed-valent regime with both quadrupolar and magnetic character. We report on the low-energy physics of the model, using a conformal field theory approach with exact Bethe Ansatz results as input.
  • Litvinov, Yu.A., et al. (författare)
  • Nuclear physics experiments with ion storage rings
  • 2013
  • Ingår i: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 317, Part B, s. 603--616
  • Konferensbidrag (refereegranskat)abstract
    • In the last two decades a number of nuclear structure and astrophysics experiments were performed at heavy-ion storage rings employing unique experimental conditions offered by such machines. Furthermore, building on the experience gained at the two facilities presently in operation, several new storage ring projects were launched worldwide. This contribution is intended to provide a brief review of the fast growing field of nuclear structure and astrophysics research at storage rings. © 2013 Elsevier B.V. All rights reserved.
  • Warbinek, Jessica, et al. (författare)
  • A graphene-based neutral particle detector
  • 2019
  • Ingår i: Applied Physics Letters. - 0003-6951. ; 114:6
  • Tidskriftsartikel (refereegranskat)abstract
    • A neutral particle detector is presented, in which the traditionally used target material, indium tin oxide (ITO), is replaced by graphene. The graphene-based detector enables collinear photodetachment measurements at a significantly shorter wavelength of light down to 230nm compared to ITO-based detectors, which are limited at 335 nm. Moreover, the background signal from the photoelectric effect is drastically reduced when using graphene. The graphene based detector, reaching 1.7 eV further into the UV energy range, allows increased possibilities for photodetachment studies of negatively charged atoms, molecules, and clusters. Published under license by AIP Publishing.
  • Bergstrom, S., et al. (författare)
  • J-factors for self-interacting dark matter in 20 dwarf spheroidal galaxies
  • 2018
  • Ingår i: Physical Review D. - 2470-0010 .- 2470-0029. ; 98:4
  • Tidskriftsartikel (refereegranskat)abstract
    • Dwarf spheroidal galaxies are among the most promising targets for indirect dark matter (DM) searches in gamma rays. The gamma-ray flux from DM annihilation in a dwarf spheroidal galaxy is proportional to the J-factor of the source. The J-factor of a dwarf spheroidal galaxy is the line-of-sight integral of the DM mass density squared times <sigma(ann)v(rel)>/<sigma(ann)v(rel)>(0), where sigma(ann)v(rel) is the DM annihilation cross-section times relative velocity v(rel) = vertical bar v(rel)vertical bar angle brackets denote average over v(rel), and (sigma(ann)v(rel)) is the v(rel)-independent part of sigma(ann)v(rel). If sigma(ann)v(rel) is constant in v(rel), J-factors only depend on the DM space distribution in the source. However, if sigma(ann)v(rel) varies with v(rel), as in the presence of DM self-interactions, J-factors also depend on the DM velocity distribution, and on the strength and range of the DM self-interaction. Models for self interacting DM are increasingly important in the study of the small scale clustering of DM, and are compatible with current astronomical and cosmological observations. Here we derive the J-factor of 20 dwarf spheroidal galaxies from stellar kinematic data under the assumption of Yukawa DM self-interactions. J-factors are derived through a profile likelihood approach, assuming either NavarroFrenk-White (NEW) or cored DM profiles. We also compare our results with J-factors derived assuming the same velocity for all DM particles in the target galaxy. We find that this common approximation overestimates the Mactors by up to 1 order of magnitude. J-factors for a sample of DM particle masses and self-interaction coupling constants, as well as for NFW and cored density profiles, are provided electronically, ready to he used in other projects.
  • Gran, Ulf, 1973-, et al. (författare)
  • Plasmons in Holographic Graphene
  • 2018
  • Ingår i: Tillämpad strängteori - holografiska metoder för starkt kopplade system.
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • For strongly correlated systems, holography is an ideal framework for computing plasmon properties. We identify all these self-sourced collective modes in holographic Maxwell theories via a specific choice of boundary condition. This method's potential to improve holographic models of e.g. graphene is demonstrated by computing the 2D-plasmon dispersion, which naturally connects to regions in parameter space accessible to conventional methods. Beyond that, this method also allows to compute the dynamical charge response of strange metals, which could be compared to experiments using (M-EELS).
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