Tilting the Primordial Power Spectrum with Bulk Viscosity

Details Tilting the Primordial Power Spectrum with Bulk Viscosity Tilting the Primordial Power Spectrum with Bulk Viscosity

1993-12-16

arxiv.org/abs/astro-ph/9312037v1

Mon.Not.Roy.Astron.Soc. 266 (1994) 489

Astronomy and Astrophysics

Astrophysics

17 pages of plain LaTex, Fermilab-Pub-93/099-A

Scientific paper

Within the context of the cold dark matter model, current observations suggest that inflationary models which generate a tilted primordial power spectrum with negligible gravitational waves provide the most promising mechanism for explaining large scale clustering. The general form of the inflationary potential which produces such a spectrum is a hyperbolic function and is interpreted physically as a bulk viscous stress contribution to the energy-momentum of a perfect baryotropic fluid. This is equivalent to expanding the equation of state as a truncated Taylor series. Particle physics models which lead to such a potential are discussed.

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