Constraining light gravitino mass from cosmic microwave background

被引：12

作者：

Ichikawa, Kazuhide ^{[1
]}

Kawasaki, Masahiro ^{[2
,3
]}

Nakayama, Kazunori ^{[2
]}

Sekiguchi, Toyokazu ^{[2
]}

Takahashi, Tomo ^{[4
]}

机构：

[1] Kyoto Univ, Dept Microengn, Kyoto 6068501, Japan

[2] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

[3] Univ Tokyo, Inst Phys & Math Universe, Chiba 2778568, Japan

[4] Saga Univ, Dept Phys, Saga 8408502, Japan

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2009年 / 08期

基金：

日本学术振兴会;

关键词：

gravitational lensing; cosmological parameters from CMBR; supersymmetry and cosmology; cosmology of theories beyond the SM; MODEL SELECTION;

D O I：

10.1088/1475-7516/2009/08/013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the possibilities of constraining the light gravitino mass m(3/2) from future cosmic microwave background (CMB) surveys. A model with light gravitino with the mass m(3/2) < O(10) eV is of great interest since it is free from the cosmological gravitino problem and, in addition, can be compatible with many baryogenesis/leptogenesis scenarios such as the thermal leptogenesis. We show that the lensing of CMB anisotropies can be a good probe for m(3/2) and obtain an expected constraint on m(3/2) from precise measurements of lensing potential in the future CMB surveys, such as the PolarBeaR and CMBpol experiments. If the gravitino mass is m(3/2) = 1 eV, we will obtain the constraint for the gravitino mass as m(3/2) = 3.2 eV (95% C.L.) for the case with Planck+PolarBeaR combined and m(3/2) = 1.04(-0.26)(+0.22) eV (68% C.L.) for CMBpol. The issue of Bayesian model selection is also discussed.

引用

页数：19

共 47 条

[41] Cosmological information from lensed CMB power spectra [J].