Is the energy density ##\rho## in the early universe and the Hubble scale ##H## during inflation related by the formula(adsbygoogle = window.adsbygoogle || []).push({});

$$H^{4} = \frac{9}{64\pi^{2}} \frac{\rho^{2}}{M_{P}^{4}}?$$

Here, ##M_{P}## is the Planck mass.

Can you suggest any resources where this is explained?

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# A Hubble scale and energy density during inflation

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