Brane cosmology driven by the rolling tachyon

By S. Mukohyama. 2002

141 citations recorded by the source corpus.

Brane cosmology driven by the tachyon rolling down to its ground state is investigated. We adopt an effective field theoretical description for the tachyon and Randall-Sundrum type brane-world scenario. After formulating the basic equations, we show that the standard cosmology with the usual scalar field can mimic the low-energy behavior of the system near the tachyon ground state. We also investigate the qualitative behavior of the system beyond the low-energy regime for a positive, negative, and vanishing four-dimensional effective cosmological constant ${\ensuremath{\Lambda}}_{4}={\ensuremath{\kappa}}_{5}^{4}{V(T}_{0}{)}^{2}/12\ensuremath{-}|{\ensuremath{\Lambda}}_{5}|/2,$ where ${\ensuremath{\kappa}}_{5}$ and ${\ensuremath{\Lambda}}_{5}$ are the five-dimensional gravitational coupling constant and (negative) cosmological constant, respectively, and ${V(T}_{0})$ is the (positive) tension of the brane in the tachyon ground state. In particular, for ${\ensuremath{\Lambda}}_{4}l0,$ the tachyon never settles down to its potential minimum and the universe eventually hits a big-crunch singularity.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/a727bf85c320f5dda979e2138b4a3965042778ea

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Citations in the corpus

Power-Law Inflation from the Rolling Tachyon (2002, background): “Based on these works, several papers studying such a fluid in the cosmological context [5], [6], [7], [8] have appeared most recently.”
Prospects and problems of tachyon matter cosmology (2002, background): “Still, in the low energy limit, one expects that the brane gravity is reduced to the four dimensional Einstein theory [13].”
Cosmological parameters from supernova observations: A critical comparison of three data sets (2003, background): “…Wang, & Steinhardt 1999) and the other corresponding to the tachyonic scalar fields (Padmanabhan 2002; Padmanabhan & Choudhury 2002; Frolov, Kofman, & Starobinsky 2002; Shiu & Wasserman 2002; Gibbons 2002; Fairbairn & Tytgat 2002; Mukohyama 2002; Feinstein 2002; Bagla, Jassal, & Padmanabhan 2003).”