TY  - JOUR
A1  - Gündelman, Eduardo
A1  - Singleton, Douglas
A1  - Yongram, N.
T1  - A two measure model of dark energy and dark matter
JF  - Journal of cosmology and astroparticle physics
N2  - In this work we construct a unified model of dark energy and dark matter. This is done with the following three elements: a gravitating scalar field, phi with a non-conventional kinetic term, as in the string theory tachyon; an arbitrary potential, V (phi); two measures - a metric measure (root-g) and a non-metric measure (Phi). The model has two interesting features: (i) For potentials which are unstable and would give rise to tachyonic scalar field, this model can stabilize the scalar field. (ii) The form of the dark energy and dark matter that results from this model is fairly insensitive to the exact form of the scalar field potential.
KW  - modified gravity
KW  - dark matter theory
KW  - dark energy theory
Y1  - 2012
U6  - https://doi.org/10.1088/1475-7516/2012/11/044
SN  - 1475-7516
IS  - 11
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  - 
TY  - JOUR
A1  - Kaeonikhom, Chakkrit
A1  - Singleton, Douglas
A1  - Sushkov, Sergey V.
A1  - Yongram, N.
T1  - Dynamics of Dirac-Born-Infeld dark energy interacting with dark matter
JF  - Physical review : D, Particles, fields, gravitation, and cosmology
N2  - We study the dynamics of Dirac-Born-Infeld (DBI) dark energy interacting with dark matter. The DBI dark energy model considered here has a scalar field with a nonstandard kinetic energy term, and has potential and brane tension that are power-law functions. The new feature considered here is an interaction between the DBI dark energy and dark matter through a phenomenological interaction between the DBI scalar field and the dark matter fluid. We analyze two different types of interactions between the DBI scalar field and the dark matter fluid. In particular we study the phase-space diagrams of and look for critical points of the phase space that are both stable and lead to accelerated, late-time expansion. In general we find that the interaction between the two dark components does not appear to give rise to late-time accelerated expansion. However, the interaction can make the critical points in the phase space of the system stable. Whether such stabilization occurs or not depends on the form of the interaction between the two dark components.
Y1  - 2012
U6  - https://doi.org/10.1103/PhysRevD.86.124049
SN  - 1550-7998
VL  - 86
IS  - 12
PB  - American Physical Society
CY  - College Park
ER  -