Entropy at the early Universe

OSVALDO M. MORESCHI

Paris, Francia

Simposio; 19th Texas Symposium of Relativistic Astrophysics; 1998

We report on the behavior of the entropy at the early Universe when the causal law is applied in the calculations of statistical mechanics. Without assuming a particular geometry, the result is that the entropy of a small unit volume tends to zero as one approaches the initial singularity. This implies that the initial data of the physical fields where asymptotically homogeneous and isotropic in that limit. It is so deduced, from Einstein equation, that the spacetime must show the same behavior as one approaches the initial singularity.