6 research outputs found
Collapse of non-spherically symmetric scalar field distributions
In the present work the collapse scenario of some exact non-spherical models
with a minimally coupled scalar field is studied. Scalar field collapse with
planar as well as toroidal, cylindrical and pseudoplanar symmetries have been
investigated. It is shown that the scalar field may have collapsing modes even
if it has the equation of state corresponding to that of a dark energy.Comment: 13 pages, 9 figures; Accepted for publication in Gen Relativ Gravit
(2011
Chameleon field and the late time acceleration of the universe
In the present work, it is shown that a chameleon scalar field having a
nonminimal coupling with dark matter can give rise to a smooth transition from
a decelerated to an accelerated phase of expansion for the universe. It is
surprising to note that the coupling with the chameleon scalar field hardly
affects the evolution of the dark matter sector, which still redshifts as
.Comment: 7 pages, 2 figure