Dark Energy Properties in DBI Theory

Details Dark Energy Properties in DBI Theory Dark Energy Properties in DBI Theory

2009-09-14

arxiv.org/abs/0909.2637v2

Phys.Rev.D80:123016,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 6 figures; v2 - minor changes, clearer figures, matches PRD version

Scientific paper

10.1103/PhysRevD.80.123016

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.

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