Kishore Ananda
University of Cape Town
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Publication
Featured researches published by Kishore Ananda.
Physical Review D | 2009
Chris Clarkson; Kishore Ananda; Julien Larena
We investigate the effect that the average backreaction of structure formation has on the dynamics of the cosmological expansion, within the concordance model. Our approach in the Poisson gauge is fully consistent up to second order in a perturbative expansion about a flat Friedmann background, including a cosmological constant. We discuss the key length scales which are inherent in any averaging procedure of this kind. We identify an intrinsic homogeneity scale that arises from the averaging procedure, beyond which a residual offset remains in the expansion rate and deceleration parameter. In the case of the deceleration parameter, this can lead to a quite large increase in the value, and may therefore have important ramifications for dark energy measurements, even if the underlying nature of dark energy is a cosmological constant. We give the intrinsic variance that affects the value of the effective Hubble rate and deceleration parameter. These considerations serve to add extra intrinsic errors to our determination of the cosmological parameters, and, in particular, may render attempts to measure the Hubble constant to percent precision overly optimistic.
Physical Review D | 2009
Naureen Goheer; Rituparno Goswami; Peter K. S. Dunsby; Kishore Ananda
Working within the theory of modified Gauss-Bonnet gravity, we show that Friedmann-Lema\^{\i}tre-Robertson-Walker--like power-law solutions only exist for a very special class of
Physical Review D | 2008
Kishore Ananda; Sante Carloni; Peter K. S. Dunsby
f(\mathcal{G})
Journal of Cosmology and Astroparticle Physics | 2009
Teresa Hui-Ching Lu; Kishore Ananda; Chris Clarkson; Roy Maartens
theories. Furthermore, we point out that any transition from decelerated to accelerated expansion must pass through
Physical Review D | 2008
Teresa Hui-Ching Lu; Kishore Ananda; Chris Clarkson
\mathcal{G}=0
Classical and Quantum Gravity | 2009
Kishore Ananda; Sante Carloni; Peter K. S. Dunsby
, and no function
arXiv: Astrophysics | 2011
Kishore Ananda; Sante Carloni; Peter K. S. Dunsby
f(\mathcal{G})
Classical and Quantum Gravity | 2008
Karim A. Malik; David Seery; Kishore Ananda
that is differentiable at this point can admit both a decelerating power-law solution and any accelerating solution. This strongly constrains the cosmological viability of
Journal of Cosmology and Astroparticle Physics | 2010
Iain A. Brown; Lily Schrempp; Kishore Ananda
f(\mathcal{G})
INVISIBLE UNIVERSE: Proceedings of the Conference | 2010
Naureen Goheer; Rituparno Goswami; Julien Larena; Peter K. S. Dunsby; Kishore Ananda
gravity, since it may not be possible to obtain an expansion history of the Universe which is compatible with observations. We explain why the same issue does not occur in