THERMODYNAMIC CONSTRAINTS ON A TIME-DEPENDENT LAMBDA-MODEL

Authors
SALIM JM WAGA I
Citation
Jm. Salim et I. Waga, THERMODYNAMIC CONSTRAINTS ON A TIME-DEPENDENT LAMBDA-MODEL, Classical and quantum gravity, 10(9), 1993, pp. 1767-1774
Citations number
10
Categorie Soggetti
Physics
Journal title
Classical and quantum gravity → ACNP
ISSN journal
02649381
Volume
10
Issue
9
Year of publication
1993
Pages
1767 - 1774
Database
ISI
SICI code
0264-9381(1993)10:9<1767:TCOATL>2.0.ZU;2-R
Abstract
The general expression for the entropy production in cosmologies with variable effective cosmological 'constant' (LAMBDA) is presented. By a ssuming that LAMBDA decays as LAMBDA = alphaR(-m)+beta(R/R)2, where R( t) is the scale factor of the FRW models, the second law of thermodyna mics and the Landau-Lifshitz theory for non-equilibrium fluctuations a re used to establish constraints on the parameters alpha, beta and m.