Abstract:A hydro-dynamical model for gravity by using an analogy with the attraction of spherical sources in incompressible fluids is proposed. Information regarding a photon-like particle called graviton is taken using an author's previous paper [6]. The substance and radiation interaction due to emission of gravitons takes place via an energy field made of the emitted gravitons and filling the entire universe. The energy distribution is considered uniform at the universe scale. A consequence of the proposed model is the increasing of the universal "constant" of gravity, as a function of the age of universe.
Based on a new physical-geometrical model for a possible evolution of early universe, the resulting thermodynamic aspects and consequences are studied. By considering an initial singularity, similar to BIG BANG, containing the total energy of the universe, the apparition of this energy from chaos is justified by using the uncertainty relation of Heisenberg. In this way, the violation of the energy conservation law - therefore of the first law of Thermodynamics - is justified. Then, by applying the second and the third laws, one shows that Big Bang (more correct name would be Big Flash) is entropy increasing as any natural process. The emerging energy expands as a spherical wave at the speed of light generating space and time. A structuring model of the primary wave is adopted by reason of geometrical simplicity and satisfying the conservation laws. From thermodynamic point of view, an adiabatic transformation leads to an exponent close to the evolution of a mono-atomic gas. The entropy variation confirms by comparison the ordering character of universe structuring
The problem of energy is one of the most important problems of the present and future. By consuming energy from various sources and for various purposes, one produces pollution: the human activity generates entropy. One question is: what happens at the Universe scale where large energy transformations are taking place? Is the entropy production leading to some kind of a pollution accumulated in known or unknown regions of the Universe? In the following, several possibilities to examine the problem of the energy changes at diverse scales in Universe are proposed.
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