A Nearly Scale Invariant Spectrum of Gravitational Radiation from Global Phase Transitions

Details A Nearly Scale Invariant Spectrum of Gravitational Radiation from Global Phase Transitions A Nearly Scale Invariant Spectrum of Gravitational Radiation from Global Phase Transitions

2007-12-05

arxiv.org/abs/0712.0778v2

Phys.Rev.Lett.100:131302,2008

Astronomy and Astrophysics

Astrophysics

4 pages, PRL published version

Scientific paper

10.1103/PhysRevLett.100.131302

Using a large N sigma model approximation we explicitly calculate the power spectrum of gravitational waves arising from a global phase transition in the early universe and we confirm that it is scale invariant, implying an observation of such a spectrum may not be a unique feature of inflation. Moreover, the predicted amplitude can be over 3 orders of magnitude larger than the naive dimensional estimate, implying that even a transition that occurs after inflation may dominate in Cosmic Microwave Background polarization or other gravity wave signals.

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