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Title: Dark energy and the MSSM

Abstract

We consider the coupling of quintessence to observable matter in supergravity and study the dynamics of both supersymmetry breaking and quintessence in this context. We investigate how the quintessence potential is modified by supersymmetry breaking and analyze the structure of the soft supersymmetry-breaking terms. We pay attention to their dependence on the quintessence field and to the electroweak symmetry breaking, i.e. the pattern of fermion masses at low energy within the minimal supersymmetric standard model (MSSM) coupled to quintessence. In particular, we compute explicitly how the fermion masses generated through the Higgs mechanism depend on the quintessence field for a general model of quintessence. Fifth force and equivalence principle violations are potentially present as the vacuum expectation values of the Higgs bosons become quintessence field dependent. We emphasize that equivalence principle violations are a generic consequence of the fact that, in the MSSM, the fermions couple differently to the two Higgs doublets. Finally, we also discuss how the scaling of the cold dark and baryonic matter energy density is modified and comment on the possible variation of the gauge coupling constants, among which is the fine structure constant, and of the proton-electron mass ratio.

Authors:
;  [1];  [2]
  1. Service de Physique Theorique, CEA-Saclay, Gif/Yvette cedex, F-91191 (France)
  2. (France)
Publication Date:
OSTI Identifier:
21020349
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevD.75.083507; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COUPLING; COUPLING CONSTANTS; ELECTRONS; ENERGY DENSITY; EQUIVALENCE PRINCIPLE; FINE STRUCTURE; HIGGS BOSONS; HIGGS MODEL; NONLUMINOUS MATTER; POTENTIALS; PROTONS; REST MASS; STANDARD MODEL; SUPERGRAVITY; SUPERSYMMETRY; SYMMETRY BREAKING

Citation Formats

Brax, Philippe, Martin, Jerome, and Institut d'Astrophysique de Paris, UMR 7095-CNRS, Universite Pierre et Marie Curie, 98bis boulevard Arago, 75014 Paris. Dark energy and the MSSM. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.083507.
Brax, Philippe, Martin, Jerome, & Institut d'Astrophysique de Paris, UMR 7095-CNRS, Universite Pierre et Marie Curie, 98bis boulevard Arago, 75014 Paris. Dark energy and the MSSM. United States. doi:10.1103/PHYSREVD.75.083507.
Brax, Philippe, Martin, Jerome, and Institut d'Astrophysique de Paris, UMR 7095-CNRS, Universite Pierre et Marie Curie, 98bis boulevard Arago, 75014 Paris. Sun . "Dark energy and the MSSM". United States. doi:10.1103/PHYSREVD.75.083507.
@article{osti_21020349,
title = {Dark energy and the MSSM},
author = {Brax, Philippe and Martin, Jerome and Institut d'Astrophysique de Paris, UMR 7095-CNRS, Universite Pierre et Marie Curie, 98bis boulevard Arago, 75014 Paris},
abstractNote = {We consider the coupling of quintessence to observable matter in supergravity and study the dynamics of both supersymmetry breaking and quintessence in this context. We investigate how the quintessence potential is modified by supersymmetry breaking and analyze the structure of the soft supersymmetry-breaking terms. We pay attention to their dependence on the quintessence field and to the electroweak symmetry breaking, i.e. the pattern of fermion masses at low energy within the minimal supersymmetric standard model (MSSM) coupled to quintessence. In particular, we compute explicitly how the fermion masses generated through the Higgs mechanism depend on the quintessence field for a general model of quintessence. Fifth force and equivalence principle violations are potentially present as the vacuum expectation values of the Higgs bosons become quintessence field dependent. We emphasize that equivalence principle violations are a generic consequence of the fact that, in the MSSM, the fermions couple differently to the two Higgs doublets. Finally, we also discuss how the scaling of the cold dark and baryonic matter energy density is modified and comment on the possible variation of the gauge coupling constants, among which is the fine structure constant, and of the proton-electron mass ratio.},
doi = {10.1103/PHYSREVD.75.083507},
journal = {Physical Review. D, Particles Fields},
number = 8,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}
  • Searches for the Minimal Supersymmetric Standard Model (MSSM) Higgs bosons are among the most promising channels for exploring new physics at the Tevatron. In particular, interesting regions of large tan {beta} and small m{sub A} are probed by searches for heavy neutral Higgs bosons, A and H, when they decay to {tau}{sup +}{tau}{sup -} and b{bar b}. At the same time, direct searches for dark matter, such as CDMS, attempt to observe neutralino dark matter particles scattering elastically off nuclei. This can occur through t-channel Higgs exchange, which has a large cross section in the case of large tan {beta}more » and small m{sub A}. As a result, there is a natural interplay between the heavy, neutral Higgs searches at the Tevatron and the region of parameter space explored by CDMS. We show that if the lightest neutralino makes up the dark matter of our universe, current limits from CDMS strongly constrain the prospects of heavy, neutral MSSM Higgs discovery at the Tevatron (at 3{sigma} with 4 fb{sup -1} per experiment) unless |{mu}| {approx}> 400 GeV. The limits of CDMS projected for 2007 will increase this constraint to |{mu}| {approx}> 800 GeV. On the other hand, if CDMS does observe neutralino dark matter in the near future, it will make the discovery of heavy, neutral MSSM Higgs bosons far more likely at the Tevatron.« less
  • We calculate the relic density of dark matter in the MSSM with CP violation. We analyze various scenarios of neutralino annihilation: the cases of a b-ino, b-ino-W-ino and b-ino-Higgsino LSP, annihilation through Higgs, as well as sfermion coannihilation scenarios. Large phase effects are found--on the one hand, due to shifts in the masses; on the other hand, due to modifications of the couplings. Taking special care to disentangle the effects in masses and couplings, we demonstrate that the presence of CP phases can have a significant influence on the neutralino relic abundance. Typical variations in {omega}h{sup 2} solely from modificationsmore » in the couplings are O (10%-100%), but can reach an order of magnitude in some cases.« less
  • In the MSSM, the presence of CP phases can have a significant impact on the neutralino relic abundance. These phase effects are on the one hand due to shifts in the masses, on the other hand due to modifications of the couplings. Typical variations in {omega}h2 solely from modifications in the couplings are O(10%-100%)