Accelerated expansion of the universe driven by tachyonic matter
Top Cited Papers
- 28 June 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 66 (2), 021301
- https://doi.org/10.1103/physrevd.66.021301
Abstract
It is an accepted practice in cosmology to invoke a scalar field with a potential when the observed evolution of the universe cannot be reconciled with theoretical prejudices. Since one function degree of freedom in the expansion factor can be traded off for the function it is always possible to find a scalar field potential which will reproduce a given evolution. I provide a recipe for determining from in two cases: (i) a normal scalar field with the Lagrangian used in quintessence or dark energy models; (ii) a tachyonic field with the Lagrangian motivated by recent string theoretic results. In the latter case, it is possible to have accelerated expansion of the universe during the late phase in certain cases.
Keywords
This publication has 16 references indexed in Scilit:
- Rolling TachyonJournal of High Energy Physics, 2002
- Inflation frombrane annihilationPhysical Review D, 2001
- Assisted inflation via tachyon condensationNuclear Physics B, 2001
- Robustness of quintessencePhysical Review D, 2000
- Quintessence and supergravityPhysics Letters B, 1999
- k-InflationPhysics Letters B, 1999
- Cosmology with a primordial scaling fieldPhysical Review D, 1998
- Cosmology with Ultralight Pseudo Nambu-Goldstone BosonsPhysical Review Letters, 1995
- Cosmological consequences of a rolling homogeneous scalar fieldPhysical Review D, 1988
- Cosmology and the fate of dilatation symmetryNuclear Physics B, 1988