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Dark energy properties in DBI theory

Title
Dark energy properties in DBI theory
Authors
Ahn C.Kim C.Linder E.V.
Ewha Authors
안창림김찬주Eric V. Linder
SCOPUS Author ID
안창림scopus; 김찬주scopus
Issue Date
2009
Journal Title
Physical Review D - Particles, Fields, Gravitation and Cosmology
ISSN
1550-7998JCR Link
Citation
vol. 80, no. 12
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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. © 2009 The American Physical Society.
DOI
10.1103/PhysRevD.80.123016
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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