Entropy - Some Cosmological Questions Answered by Model of Expansive Nondecelerative Universe

The paper summarizes the background of Expansive Nondecelerative Universe model and its potential to offer answers to some open cosmological questions related to entropy. Three problems are faced in more detail, namely that of Hawking's phenomenon of black holes evaporation, maximum entropy of the Universe during its evolution, and time evolution of specific entropy. 1. Background of Expansive Nondecelerative Universe model Starting from the beginning of 80's, the inflation model of the universe acquired dominant position in cosmology. The model has been able to eliminate certain cosmological problems, at the same time it has, however, open new questions, such as the Universe age, Hubble's constant or deceleration parameter values. It has not contributed to deepen our understanding of the gravitation and its relation to the other physical interactions. Moreover, in accordance with some analyses [1], the initial nonhomogenities should not be eliminated but they are rather enhanced within the inflation period. Open questions have been a challenge for developing further models of the Universe, one of them being Expansive Nondecelerative Universe (ENU) model [2-5]. The cornerstones of ENU are as follows: a) The Universe, throughout the whole expansive evolutionary phase, expands by a constant rate equals the speed of light c obeying thus relation