Probing the equation of state of the early universe with a space laser interferometer
Naoki Seto, Jun'Ichi Yokoyama
Abstract
We propose a method to probe the equation of state of the early universe and its evolution, using the stochastic gravitational wave background from inflation. A small deviation from purely radiation dominated universe (w= 1/3) would be clearly imprinted on the gravitational wave spectrum ΩGW(f) due to the nearly scale invariant nature of inflationary generated waves.
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