Oscillating modulation to B-mode polarization from varying propagating speed of primordial gravitational waves

被引：21

作者：

Cai, Yong ^{[1
]}

Wang, Yu-Tong ^{[1
]}

Piao, Yun-Song ^{[1
,2
]}

机构：

[1] Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW D | 2015年 / 91卷 / 10期

关键词：

INFLATION; SPECTRUM; COSMOLOGY; EQUATIONS; UNIVERSE;

D O I：

10.1103/PhysRevD.91.103001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In low-energy effective string theory and modified gravity theories, the propagating speed c(T) of primordial gravitational waves may deviate from unity. We find that the steplike variation of c(T) during slow-roll inflation may result in an oscillating modulation to the B-mode polarization spectrum, which can hardly be imitated by adjusting other cosmological parameters, and the intensity of the modulation is determined by the dynamics of c(T). Thus provided that the foreground contribution is under control, high-precision cosmic microwave background (CMB) polarization observations will be able to put tight constraint on the variation of c(T), and so the corresponding theories.

引用

页数：8

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