Cosmological Term and Fundamental Physics
Abstract
A nonvanishing cosmological term in Einstein's equations implies a nonvanishing spacetime curvature even in the absence of any kind of matter. It would, in consequence, affect many of the underlying kinematic tenets of physical theory. The usual commutative spacetime translations of the Poincaré group would be replaced by the mixed conformal translations of the de Sitter group, leading to obvious alterations in elementary concepts such as time, energy and momentum. Although negligible at small scales, such modifications may come to have important consequences both in the large and for the inflationary picture of the early Universe. A qualitative discussion is presented, which suggests deep changes in Hamiltonian, Quantum and Statistical Mechanics. In the primeval universe as described by the standard cosmological model, in particular, the equations of state of the matter sources could be quite different from those usually introduced.
 Publication:

International Journal of Modern Physics D
 Pub Date:
 2004
 DOI:
 10.1142/S0218271804006279
 arXiv:
 arXiv:grqc/0405104
 Bibcode:
 2004IJMPD..13.2241A
 Keywords:

 Cosmological constant;
 de Sitter kinematics;
 early universe;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 RevTeX, 4 pages. Selected for Honorable Mention in the Annual Essay Competition of the Gravity Research Foundation for the year 2004