Problems with Tachyon Inflation
By Lev Kofman, Andrei Linde. 2002
185 citations recorded by the source corpus.
We consider cosmological consequences of string theory tachyon condensation. We show that it is very difficult to obtain inflation in the simplest versions of this theory. Typically, inflation in these theories could occur only at super-Planckian densities, where the effective 4D field theory is inapplicable. Reheating and creation of matter in models where the minimum of the tachyon potential V(T) is at T?? is problematic because the tachyon field in such theories does not oscillate. If the universe after inflation is dominated by the energy density of the tachyon condensate, it will always remain dominated by the tachyons. It might happen that the tachyon condensation is responsible for a short stage of inflation at a nearly Planckian density, but one would need to have a second stage of inflation after that. This would imply that the tachyon played no role in the post-inflationary universe until the very late stages of its evolution. These problems do not appear in the recently proposed models of hybrid inflation where the complex tachyon field has a minimum at T << Mp.
Subfields: Astronomy and Astrophysics, Atmospheric Science, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/6db9d4ecd3d869a0be32bb7102ce69bbb8ebb32a
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Citations in the corpus
- Inflation from a tachyon fluid (2002, background): “The problem with this is that the universe would never become radiation dominated and for tachyon matter to be relevant in cosmology requires some fine-tuning [17, 16].”
- Towards inflation in string theory (2003, background): “Here we will show that one of the possible problems of this scenario, the overproduction of cosmic strings [42,43], is ameliorated by the warped geometry.”
- Coupling of rolling tachyon to closed strings (2002, background): “It also implies the reheating problem in tachyon inflation scenarios [12] as pointed out in [13].”
- Caustics in Tachyon Matter and Other Born-Infeld Scalars (2002, background): “1) triggered significant interest in the investigation of the role of tachyons in cosmology [5, 6, 7, 8, 9] and field theory of tachyon [10].”