714 citations · 810 across the 6 of their papers we have counts for
7 papers · 1 filter
Cosmic Acceleration and Extra Dimensions
Varun Sahni, Yuri Shtanov
Brane cosmology presents many interesting possibilities including: phantom acceleration (w<-1), self-acceleration, unification of dark energy with inflation, transient acceleration…
Two new diagnostics of dark energy
Varun Sahni, Arman Shafieloo, Alexei A. Starobinsky
We introduce two new diagnostics of dark energy (DE). The first, Om, is a combination of the Hubble parameter and the cosmological redshift and provides a "null test" of dark energ…
Gravitational instability on the brane: the role of boundary conditions
Yuri Shtanov, Alexander Viznyuk, Varun Sahni
An outstanding issue in braneworld theory concerns the setting up of proper boundary conditions for the brane-bulk system. Boundary conditions (BC's) employing regulatory branes or…
Cosmological Surprises from Braneworld models of Dark Energy
Varun Sahni
Properties of Braneworld models of dark energy are reviewed. Braneworld models admit the following interesting possibilities: (i) The effective equation of state can be w < -1 as w…
Exploring dark energy using the Statefinder
Varun Sahni
Observations of high redshift supernovae indicate that the universe is accelerating. The hypothesis of `Dark energy' (cosmological constant, scalar field tracker potentials, branew…
Supernova Constraints on Braneworld Dark Energy
Ujjaini Alam, Varun Sahni
Braneworld models of dark energy are examined in the light of observations of high redshift type Ia supernovae. Braneworld models admit several novel and even exotic possibilities…