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Dive into the research topics where Kishore Ananda is active.

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Featured researches published by Kishore Ananda.


Physical Review D | 2009

Influence of structure formation on the cosmic expansion

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

Coexistence of matter dominated and accelerating solutions in f ( G ) gravity

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

Evolution of cosmological gravitational waves in f(R) gravity

Kishore Ananda; Sante Carloni; Peter K. S. Dunsby

f(\mathcal{G})


Journal of Cosmology and Astroparticle Physics | 2009

The cosmological background of vector modes

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

Vector modes generated by primordial density fluctuations

Teresa Hui-Ching Lu; Kishore Ananda; Chris Clarkson

\mathcal{G}=0


Classical and Quantum Gravity | 2009

Structure growth in f(R) theories of gravity with a dust equation of state

Kishore Ananda; Sante Carloni; Peter K. S. Dunsby

, and no function


arXiv: Astrophysics | 2011

A characteristic signature of fourth order gravity

Kishore Ananda; Sante Carloni; Peter K. S. Dunsby

f(\mathcal{G})


Classical and Quantum Gravity | 2008

Different approaches to the second-order Klein-Gordon equation

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

Accelerating the Universe with Gravitational Waves

Iain A. Brown; Lily Schrempp; Kishore Ananda

f(\mathcal{G})


INVISIBLE UNIVERSE: Proceedings of the Conference | 2010

On the co‐existence of matter dominated and accelerating solutions in f(G)‐gravity and the case of f(R)‐gravity

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

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Sante Carloni

Instituto Superior Técnico

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Sante Carloni

Instituto Superior Técnico

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