Is cosmology compatible with blue gravity waves?

被引：15

作者：

Camerini, Roberta ^{[1
]}

Durrer, Ruth ^{[2
]}

Melchiorri, Alessandro ^{[1
,3
]}

Riotto, Antonio ^{[4
,5
]}

机构：

[1] Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy

[2] Univ Geneva, Dept Theoret Phys, CH-1211 Geneva 4, Switzerland

[3] Univ Roma La Sapienza, INFN, I-00185 Rome, Italy

[4] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[5] CERN, Div Theory, CH-1211 Geneva, Switzerland

来源：

PHYSICAL REVIEW D | 2008年 / 77卷 / 10期

关键词：

D O I：

10.1103/PhysRevD.77.101301

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A primordial gravitational wave background with positive (blue) spectral index is expected in several nonstandard inflationary cosmologies where the stress-energy tensor violates the null energy condition. Here we show that a sizable amount of blue gravitational waves is compatible with current cosmological and astrophysical data. So far most of the works on parameter estimation from cosmic microwave background data have assumed a negative or negligible spectral index. The present limits on cosmological parameters, especially on the scalar spectral index, widen up considerably when one allows also for blue tilts of the tensor spectrum. Since the amplitude of the cosmic microwave background (CMB) B-mode polarization is larger in these models, future data from Planck are likely to provide crucial measurements.

引用

页数：5

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