TY - JOUR
T1 - Cosmic gravitational-wave background in a cyclic universe
AU - Boyle, Latham A.
AU - Steinhardt, Paul J.
AU - Turok, Neil
PY - 2004
Y1 - 2004
N2 - Inflation predicts a primordial gravitational wave spectrum that is slightly “red.” In this Brief Report, we compute both the amplitude and spectral form of the primordial tensor spectrum predicted by cyclic or ekpyrotic models under the assumption that perturbations pass smoothly through the bounce. The spectrum is exponentially suppressed compared to inflation on long wavelengths. The strongest constraint is that the energy density in gravitational waves is less than 10% of the critical density at nucleosynthesis.
AB - Inflation predicts a primordial gravitational wave spectrum that is slightly “red.” In this Brief Report, we compute both the amplitude and spectral form of the primordial tensor spectrum predicted by cyclic or ekpyrotic models under the assumption that perturbations pass smoothly through the bounce. The spectrum is exponentially suppressed compared to inflation on long wavelengths. The strongest constraint is that the energy density in gravitational waves is less than 10% of the critical density at nucleosynthesis.
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U2 - 10.1103/PhysRevD.69.127302
DO - 10.1103/PhysRevD.69.127302
M3 - Article
AN - SCOPUS:3843144919
VL - 69
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 12
ER -