Phys. Rev. Lett. 100, 131302 (2008) [4 pages]Nearly Scale Invariant Spectrum of Gravitational Radiation from Global Phase TransitionsReceived 5 December 2007; revised 22 February 2008; published 2 April 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.131302
DOI:
10.1103/PhysRevLett.100.131302
PACS:
98.80.Cq, 04.30.Tv, 98.70.Vc
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