COMMENT: Wavefront speeds in power-law inflation driven by bulk viscosity and matter creation

Details COMMENT: Wavefront speeds in power-law inflation driven by bulk viscosity and matter creation COMMENT: Wavefront speeds in power-law inflation driven by bulk viscosity and matter creation

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997cqgra..14.1387g&link_type=abstract

Classical and Quantum Gravity, Volume 14, Issue 5, pp. 1387-1391 (1997).

Computer Science

4

Scientific paper

In the framework of a spatially flat FLRW model, we account for dissipative effects in a simple fluid, namely bulk viscosity and matter creation. For an isentropic evolution, we study the wavefront speeds associated with the characteristics of the fluid. With the assumption of a barotropic equation of state, we investigate the consequences on these speeds of power-law behaviour for the scale factor. Our conclusion is that, in contrast to the exponential inflation, the isentropic power-law inflation is compatible with causality, under conditions linking the generalized `adiabatic' index 0264-9381/14/5/036/img7 to the exponent m of the power law.

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