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Confronting Braneworld Cosmology with Supernova data and Baryon Oscillations
Ujjaini Alam, Varun Sahni
Braneworld cosmology has several attractive and distinctive features. For instance the effective equation of state in braneworld models can be both quintessence-like (w_0 \geq -1)…
The case for dynamical dark energy revisited
Ujjaini Alam, Varun Sahni, A. A. Starobinsky
We investigate the behaviour of dark energy using the recently released supernova data of Riess et al ~(2004) and a model independent parameterization for dark energy (DE). We find…
Is there Supernova Evidence for Dark Energy Metamorphosis ?
Ujjaini Alam, Varun Sahni, Tarun Deep Saini +1
We reconstruct the equation of state of dark energy (DE) using a recently released data set containing 172 type Ia supernovae without assuming the prior (in c…
Exploring the Expanding Universe and Dark Energy using the Statefinder Diagnostic
Ujjaini Alam, Varun Sahni, Tarun Deep Saini +1
The coming few years are likely to witness a dramatic increase in high quality Sn data as current surveys add more high redshift supernovae to their inventory and as newer and deep…
Can dark energy be decaying?
Ujjaini Alam, Varun Sahni, A. A. Starobinsky
We explore the fate of the universe given the possibility that the density associated with `dark energy' may decay slowly with time. Decaying dark energy is modeled by a homogeneou…
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…