Nonlocal String Tachyon as a Model for Cosmological Dark Energy

Journal Article · Wed Mar 29 00:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2193132· OSTI ID:20800059

Aref'eva, Irina Ya ^[1]

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1. Steklov Mathematical Institute, Russian Academy of Sciences, Gubkin st. 8, Moscow, 119991 (Russian Federation)

There are many different phenomenological models describing the cosmological dark energy and accelerating Universe by choosing adjustable functions. In this paper we consider a specific model of scalar tachyon field which is derived from the NSR string field theory and study its cosmological applications. We find that in the effective field theory approximation the equation of state parameter w < -1, i.e. one has a phantom Universe. It is shown that due to nonlocal effects there is no quantum instability that the usual phantom models suffer from. Moreover due to a flip effect of the potential the Universe does not enter to a future singularity.

• OSTI ID: 20800059
• Journal Information: AIP Conference Proceedings, Vol. 826, Issue 1; Conference: 2. international conference on p-adic mathematical physics, Belgrade (Serbia and Montenegro), 15-21 Sep 2005; Other Information: DOI: 10.1063/1.2193132; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
APPROXIMATIONS
COSMOLOGY
EQUATIONS OF STATE
INSTABILITY
NONLUMINOUS MATTER
QUANTUM FIELD THEORY
SCALARS
SINGULARITY
STRING MODELS
TACHYONS
UNIVERSE