- #1
Whitehole
- 132
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Based on the vast cosmology texts, I have seen that the expression for the tensor-to-scalar ratio ##r## in cold inflation is,
##r=16\epsilon_H = -16\frac{\dot H}{H^2}\qquad## where, ##~~~\epsilon_H = -\frac{\dot H}{H^2}##
##H## is the Hubble parameter, and ##\epsilon_H## is the Hubble slow roll parameter.
I want to know if this expression is exact or approximation only? I want to numerically compute ##r## but in the case of warm inflation.
##r=16\epsilon_H = -16\frac{\dot H}{H^2}\qquad## where, ##~~~\epsilon_H = -\frac{\dot H}{H^2}##
##H## is the Hubble parameter, and ##\epsilon_H## is the Hubble slow roll parameter.
I want to know if this expression is exact or approximation only? I want to numerically compute ##r## but in the case of warm inflation.
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