Abstract
Hubble constant is found relating velocities and distances of galaxies. Actually Cepheid stars and cosmic background radiation present two distinct values for the Hubble constant. Theoretically such a Hubble parameter naturally emerges from the scale factor variations considered in cosmological models. On the other hand Unruh effect relates temperature to accelerated observers. Such a relation plots a search for physical constraints aiming to justify the referred effect. Here we establish a relation between the Unruh temperature and that one from ensemble fugacity, which can be obtained from an generalized chemical potential. Then, we find a dependence on the quantities involved in the generalized chemical potential for the cosmological constant. Finally, we determine a new relation for the Hubble parameter.
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