Nearly Scale Invariant Spectrum of Gravitational Radiation from Global Phase Transitions

Katherine Jones-Smith, Lawrence M. Krauss, and Harsh Mathur
Phys. Rev. Lett. 100, 131302 – Published 2 April 2008

Abstract

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.

  • Figure
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  • Received 5 December 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.131302

©2008 American Physical Society

Authors & Affiliations

Katherine Jones-Smith1, Lawrence M. Krauss1,2, and Harsh Mathur1

  • 1CERCA, Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106-7079, USA
  • 2Department of Astronomy, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106-7079, USA

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Issue

Vol. 100, Iss. 13 — 4 April 2008

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