Inhomogeneous cosmologies with tachyonic dust as dark matter

Details Inhomogeneous cosmologies with tachyonic dust as dark matter Inhomogeneous cosmologies with tachyonic dust as dark matter

2003-04-02

arxiv.org/abs/gr-qc/0304017v2

Gen.Rel.Grav.36:1741-1763,2004

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

23 pages, four figures. Updated version incorporates some changes in the introduction. Clarification on why the term tachyonic

Scientific paper

10.1023/B:GERG.0000035949.09056.

A cosmology is considered driven by a stress-energy tensor consisting of a perfect fluid, an inhomogeneous pressure term (which we call a ``tachyonic dust'' for reasons which will become apparent) and a cosmological constant. The inflationary, radiation dominated and matter dominated eras are investigated in detail. In all three eras, the tachyonic pressure decreases with increasing radius of the universe and is thus minimal in the matter dominated era. The gravitational effects of the dust, however, may still strongly affect the universe at present time. In case the tachyonic pressure is positive, it enhances the overall matter {\em density} and is a candidate for dark matter. In the case where the tachyonic pressure is negative, the recent acceleration of the universe can be understood without the need for a cosmological constant. The ordinary matter, however, has positive energy density at all times. In a later section, the extension to a variable cosmological term is investigated and a specific model is put forward such that recent acceleration and future re-collapse is possible.

Affiliated with

Also associated with

No associations

Rating

Inhomogeneous cosmologies with tachyonic dust as dark matter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Inhomogeneous cosmologies with tachyonic dust as dark matter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inhomogeneous cosmologies with tachyonic dust as dark matter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-730053