Aldrovandi, R.Almeida, JPBNPereira, J. G.2014-05-202014-05-202004-12-01International Journal of Modern Physics D. Singapore: World Scientific Publ Co Pte Ltd, v. 13, n. 10, p. 2241-2248, 2004.0218-2718http://hdl.handle.net/11449/23423A 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 Poincare 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.2241-2248engcosmological constantde Sitter kinematicsearly universeArtigo10.1142/S0218271804006279WOS:000227504500011Acesso restrito1599966126072450