Is Cosmology Compatible with Blue Gravity Waves ?

Details Is Cosmology Compatible with Blue Gravity Waves ? Is Cosmology Compatible with Blue Gravity Waves ?

2008-02-11

arxiv.org/abs/0802.1442v1

Phys.Rev.D77:101301,2008

Astronomy and Astrophysics

Astrophysics

5 Pages, 5 Figures

Scientific paper

10.1103/PhysRevD.77.101301

A primordial gravitational wave background with positive(blue) spectral index is expected in several non-standard 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 CMB B-mode polarization is larger in these models, future data from Planck are likely to provide crucial measurements.

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