Cosmological Signature of Tachyon Condensation

Abstract

We consider the dynamics of the open string tachyon condensation in a framework of the cubic fermionic String Field Theory including a non-minimal coupling with closed string massless modes, the graviton and the dilaton. Coupling of the open string tachyon and the dilaton is motivated by the open String Field Theory in a linear dilaton background and the flat space-time. We note that the dilaton gravity provides several restrictions on the tachyon condensation and show explicitly that the influence of the dilaton on the tachyon condensation is essential and provides a significant effect: oscillations of the Hubble parameter and the state parameter become of a cosmological scale. We give an estimation for the period of these oscillations (0.1-1) Gyr and note a good agreement of this period with the observed oscillations with a period (0.15-0.65) Gyr in a distribution of quasar spectra.

19 pages, JHEP3 class; v2: presentation in Section 3 improved

Cited by in corpus (7)

• Towards a Resolution of the Cosmological Singularity in Non-local Higher Derivative Theories of Gravity
• Nonlocal gravity and the diffusion equation
• The transient and the late time attractor tachyon dark energy: Can we distinguish it from quintessence ?
• Generalized non-local $R^2$-like inflation
• Formation of caustics in Dirac-Born-Infeld type scalar field systems
• Multi-scalar field cosmology from SFT: an exactly solvable approximation
• Cosmology in nonlocal gravity