skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Light W-ino dark matter in brane world cosmology

Abstract

The thermal relic density of W-ino-like neutralino dark matter in brane world cosmology is studied. The expansion law at a high energy regime in brane world cosmology is modified from the one in standard cosmology, and the resultant relic density can be enhanced if the five-dimensional Planck mass M{sub 5} is low enough. We calculate the W-ino-like neutralino relic density in the anomaly mediated supersymmetry breaking scenario and show that the allowed region is dramatically modified from the one in standard cosmology and the W-ino-like neutralino with mass of order 100 GeV can be a good candidate for dark matter. Since the allowed region disappears eventually as M{sub 5} decreases, we can find a lower bound on M{sub 5} > or approx. 100 TeV according to the neutralino dark matter hypothesis, namely, the lower bound in order for the allowed region of neutralino dark matter to exist.

Authors:
; ;  [1];  [2];  [3]
  1. Department of Physics, College of Science and Technology, Nihon University, 1-8-14, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-8308 (Japan)
  2. (Sokendai), Oho 1-1, Tsukuba, Ibaraki 305-0801 (Japan)
  3. (United Kingdom)
Publication Date:
OSTI Identifier:
20782622
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevD.73.063518; (c) 2006 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; COSMOLOGY; DENSITY; GEV RANGE; MASS; MEMBRANES; NONLUMINOUS MATTER; PARTICLE IDENTIFICATION; SPARTICLES; SYMMETRY BREAKING; TEV RANGE

Citation Formats

Nihei, Takeshi, Okada, Nobuchika, Seto, Osamu, Theory Division, KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan and Department of Particle and Nuclear Physics, The Graduate University for Advanced Studies, and Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QJ. Light W-ino dark matter in brane world cosmology. United States: N. p., 2006. Web. doi:10.1103/PHYSREVD.73.063518.
Nihei, Takeshi, Okada, Nobuchika, Seto, Osamu, Theory Division, KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan and Department of Particle and Nuclear Physics, The Graduate University for Advanced Studies, & Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QJ. Light W-ino dark matter in brane world cosmology. United States. doi:10.1103/PHYSREVD.73.063518.
Nihei, Takeshi, Okada, Nobuchika, Seto, Osamu, Theory Division, KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan and Department of Particle and Nuclear Physics, The Graduate University for Advanced Studies, and Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QJ. Wed . "Light W-ino dark matter in brane world cosmology". United States. doi:10.1103/PHYSREVD.73.063518.
@article{osti_20782622,
title = {Light W-ino dark matter in brane world cosmology},
author = {Nihei, Takeshi and Okada, Nobuchika and Seto, Osamu and Theory Division, KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan and Department of Particle and Nuclear Physics, The Graduate University for Advanced Studies and Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QJ},
abstractNote = {The thermal relic density of W-ino-like neutralino dark matter in brane world cosmology is studied. The expansion law at a high energy regime in brane world cosmology is modified from the one in standard cosmology, and the resultant relic density can be enhanced if the five-dimensional Planck mass M{sub 5} is low enough. We calculate the W-ino-like neutralino relic density in the anomaly mediated supersymmetry breaking scenario and show that the allowed region is dramatically modified from the one in standard cosmology and the W-ino-like neutralino with mass of order 100 GeV can be a good candidate for dark matter. Since the allowed region disappears eventually as M{sub 5} decreases, we can find a lower bound on M{sub 5} > or approx. 100 TeV according to the neutralino dark matter hypothesis, namely, the lower bound in order for the allowed region of neutralino dark matter to exist.},
doi = {10.1103/PHYSREVD.73.063518},
journal = {Physical Review. D, Particles Fields},
number = 6,
volume = 73,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}
  • We investigate the thermal relic density of cold dark matter in the context of brane world cosmology. Since the expansion law in a high energy regime is modified from the one in the standard cosmology, if the dark matter decouples in such a high energy regime its relic number density is affected by this modified expansion law. We derive analytic formulas for the number density of dark matter. It is found that the resultant relic density is characterized by the 'transition temperature' at which the modified expansion law in brane world cosmology is connecting with the standard one, and canmore » be considerably enhanced compared to that in the standard cosmology, if the transition temperature is low enough.« less
  • The thermal relic density of neutralino dark matter in the brane world cosmology is studied. Since the expansion law at a high energy regime in the brane world cosmology is modified from the one in the standard cosmology, the resultant relic density can be altered. It has been found that, if the five-dimensional Planck mass M{sub 5} is lower than 10{sup 4} TeV, the brane world cosmological effect is significant at the decoupling time, and the resultant relic density is enhanced. We calculate the neutralino relic density in the constrained minimal supersymmetric standard model and show that the allowed regionmore » is dramatically modified from the one in the standard cosmology and eventually disappears as M{sub 5} is decreasing. We also find a new lower bound on M{sub 5} > or approx. 600 TeV based on the neutralino dark matter hypothesis, namely, the lower bound in order for the allowed region of neutralino dark matter to exist.« less
  • We investigate the dark matter prospects of supersymmetric models with nonuniversal gaugino masses at low values of tan{beta}. We find that for particular values of the ratio of soft supersymmetry-breaking gaugino masses, M{sub 2}/M{sub 1}, an enhanced coannihilation efficiency between the lightest chargino and the lightest neutralino occurs. As a specific example, we investigate models of hidden sector gaugino condensation. These models exhibit high scalar masses and the requisite freedom in the ratio of gaugino masses. The cosmologically viable regions of parameter space are investigated, allowing very specific statements to be made about the content of the supersymmetry-breaking hidden sector.
  • No abstract prepared.
  • We investigate the phenomenology of a wino lightest superparticle as obtained in anomaly mediated supersymmetry breaking and some string models. The Wilkinson Microwave Anisotropy Probe constraint on the dark matter relic density implies a wino lightest superparticle mass of 2.0-2.3 TeV. We find a viable signature for such a heavy wino at CLIC, operating at its highest center of mass energy of 5 TeV. One also expects a viable monochromatic {gamma}-ray signal from its pair-annihilation at the galactic center at least for cuspy dark matter halo profiles.