Post-inflationary gravitino production revisited

被引:67
作者
Ellis, John [1 ,2 ]
Garcia, Marcos A. G. [3 ]
Nanopoulos, Dimitri V. [6 ,7 ,8 ]
Olive, Keith A. [3 ]
Peloso, Marco [4 ,5 ]
机构
[1] Kings Coll London, Dept Phys, Theoret Particle Phys & Cosmol Grp, London WC2R 2LS, England
[2] CERN, Dept Theoret Phys, CH-1211 Geneva 23, Switzerland
[3] Univ Minnesota, William I Fine Theoret Phys Inst, Sch Phys & Astron, 116 Church St SE, Minneapolis, MN 55455 USA
[4] Univ Minnesota, Sch Phys & Astron, 116 Church St SE, Minneapolis, MN 55455 USA
[5] Univ Minnesota, Minnesota Inst Astophys, 116 Church St SE, Minneapolis, MN 55455 USA
[6] Texas A&M Univ, George P & Cynthia W Mitchell Inst Fundamental Ph, College Stn, TX 77843 USA
[7] Houston Adv Res Ctr, Astroparticle Phys Grp, Mitchell Campus, The Woodlands, TX 77381 USA
[8] Acad Athens, Div Nat Sci, 28 Panepistimiou Ave, Athens 10679, Greece
来源
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2016年 / 03期
基金
欧洲研究理事会;
关键词
inflation; particle physics - cosmology connection; supersymmetry and cosmology; dark matter theory; LATE-DECAYING PARTICLES; COSMOLOGICAL CONSTRAINTS; NUCLEOSYNTHESIS; SUPERGRAVITY; REGENERATION; MODELS; SAVE;
D O I
10.1088/1475-7516/2016/03/008
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We revisit gravitino production following inflation. As a first step, we review the standard calculation of gravitino production in the thermal plasma formed at the end of post-inflationary reheating when the inflator has completely decayed. Next we consider gravitino production prior to the completion of reheating, assuming that the inflaton decay products thermalize instantaneously while they are still dilute. We then argue that instantaneous thermalization is in general a good approximation, and also show that the contribution of non-thermal gravitino production via the collisions of inflaton decay products prior to thermalization is relatively small. Our final estimate of the gravitino-to-entropy ratio is approximated well by a standard calculation of gravitino production in the post-inflationary thermal plasma assuming total instantaneous decay and thermalization at a time t similar or equal to 1.2/Gamma(phi). Finally, in light of our calculations, we consider potential implications of upper limits on the gravitino abundance for models of inflation, with particular attention to scenarios for inflator decays in supersymmetric Starobinsky-like models.
引用
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页数:33
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