منابع مشابه
Thoughts on tachyon cosmology
After a pedagogical review of elementary cosmology, I go on to discuss some obstacles to obtaining inflationary or accelerating universes in M/string theory. In particular, I give an account of an old ‘no-go theorem’ to this effect. I then describe some recent ideas about the possible role of the tachyon in cosmology. I stress that there are many objections to a naive inflationary model based o...
متن کاملTachyon field in cosmology
We study cosmological effects of homogeneous tachyon field as dark energy. We concentrate on two different scalar field potentials, the inverse square potential and the exponential potential. These models have a unique feature that the matter density parameter and the density parameter for tachyons remain comparable for a large range in redshift. It is shown that there exists a range of paramet...
متن کاملCosmology of rolling tachyon
Recent analysis of string theory 1,2,3 suggests that classical dynamics of tachyon on an unstable D-brane is described by a scalar Born-Infeld type action with a runaway potential 4. Characteristic of such tachyon effective theory is absence of perturbative tachyonic modes around the potential minimum and existence of spatially homogeneous rolling tachyon configuration 5. In the background of t...
متن کاملInstanton Solution in Tachyon Cosmology
We find an exact classical solution in Euclidean gravity coupled to a scalar field with a particular form of potential commonly used in tachyon cosmology. This solution represents a tunneling between two vacua.
متن کاملRemarks on Tachyon Driven Cosmology
We begin by reviewing the results on the decay of unstable D-branes in type II string theory, and the open-closed string duality proposal that arises from these studies. We then apply this proposal to the study of tachyon driven cosmology, namely cosmological solutions describing the decay of unstable space filling D-branes. This naturally gives rise to a time reversal invariant bounce solution...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2007
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2007/04/029