TY - JOUR
T1 - Nearly scale invariant spectrum of gravitational radiation from global phase transitions
AU - Jones-Smith, Katherine
AU - Krauss, Lawrence M.
AU - Mathur, Harsh
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/4/2
Y1 - 2008/4/2
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.100.131302
DO - 10.1103/PhysRevLett.100.131302
M3 - Article
AN - SCOPUS:41749110000
SN - 0031-9007
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
IS - 13
M1 - 131302
ER -