Observational Constraints on Theories with a Blue Spectrum of Tensor Modes

Details Observational Constraints on Theories with a Blue Spectrum of Tensor Modes Observational Constraints on Theories with a Blue Spectrum of Tensor Modes

2007-11-28

arxiv.org/abs/0711.4602v3

JCAP 0808:012,2008

Astronomy and Astrophysics

Astrophysics

12 pages, 1 figure, 2 references added, relationship of this work with Ref. 20 added

Scientific paper

10.1088/1475-7516/2008/08/012

Motivated by the string gas cosmological model, which predicts a blue tilt of the primordial gravitational wave spectrum, we examine the constraints imposed by current and planned observations on a blue tilted tensor spectrum. Starting from an expression for the primordial gravitational wave spectrum normalized using cosmic microwave background observations, pulsar timing, direct detection and nucleosynthesis bounds are examined. If we assume a tensor to scalar ratio on scales of the CMB which equals the current observational upper bound, we obtain from these current observations constraints on the tensor spectral index of $n_{T} \lesssim 0.79$, $n_{T} \lesssim 0.53$, and $n_{T} \lesssim 0.15$ respectively.

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