TY - JOUR
T1 - Late-time entropy production and relic abundances of neutralinos
AU - Nagano, Takaaki
AU - Yamaguchi, Masahiro
N1 - Funding Information:
This work was supported in part by the Grant–in–Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan No. 09640333.
PY - 1998/10/22
Y1 - 1998/10/22
N2 - Many models possess unwanted relics, which should be diluted by entropy production just before the big-bang nucleosynthesis. A field responsible for the entropy production may produce stable weakly interacting massive particles, if kinematically accessible. We compute their relic abundances by integrating out coupled equations numerically. Applying our results to supersymmetric standard models, we argue that the neutralino lightest superparticles will overdose the universe in most of the parameter space if the reheat temperature is of the order of 10 MeV.
AB - Many models possess unwanted relics, which should be diluted by entropy production just before the big-bang nucleosynthesis. A field responsible for the entropy production may produce stable weakly interacting massive particles, if kinematically accessible. We compute their relic abundances by integrating out coupled equations numerically. Applying our results to supersymmetric standard models, we argue that the neutralino lightest superparticles will overdose the universe in most of the parameter space if the reheat temperature is of the order of 10 MeV.
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U2 - 10.1016/S0370-2693(98)00989-7
DO - 10.1016/S0370-2693(98)00989-7
M3 - Article
AN - SCOPUS:0348116338
SN - 0370-2693
VL - 438
SP - 267
EP - 272
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 3-4
ER -