Dark energy properties in DBI theory

Journal Article · Tue Dec 15 04:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.123016· OSTI ID:21313551

Ahn, Changrim; Kim, Chanju ^[1]; Linder, Eric V ^[1]

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1. Institute for the Early Universe and Department of Physics, Ewha Womans University, Seoul 120-750 (Korea, Republic of)

The Dirac-Born-Infeld (DBI) action from string theory provides several new classes of dark energy behavior beyond quintessence due to its relativistic kinematics. We constrain parameters of natural potentials and brane tensions with cosmological observations as well as showing how to design these functions for a desired expansion history. We enlarge the attractor solutions, including new ways of obtaining cosmological constant behavior, to the case of generalized DBI theory with multiple branes. An interesting novel signature of DBI attractors is that the sound speed is driven to zero, unlike for quintessence where it is the speed of light.

• OSTI ID: 21313551
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 12 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
ATTRACTORS
BORN-INFELD THEORY
BRANES
COSMOLOGICAL CONSTANT
EXPANSION
MATHEMATICAL SOLUTIONS
NONLUMINOUS MATTER
POTENTIALS
RELATIVISTIC RANGE
SOUND WAVES
STRING MODELS
STRING THEORY
VELOCITY