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In Carroll's there is a brief introduction to a dynamical dark energy in which the equation of motion for slowly rolling scalar field is discussed.

Then to give an idea about the mass scale of this field it is compared to the Hubble constant, saying that it has an energy of almost [itex] H_0= 10^-33 eV [/itex].

If we assume that the Hubble constant is almost 70 km/s/Mpc can someone please show how we infer and compute that energy scale in particle physics?

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# Energy scale of Hubble constant for dark energy scalar field

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