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Gauge-invariant analysis of perturbations in Chaplygin gas unified models of dark matter and dark energy
V. Gorini, A. Y. Kamenshchik, U. Moschella +2
We exploit the gauge-invariant formalism to analyse the perturbative behaviour of two cosmological models based on the generalized Chaplygin gas describing both dark matter and dar…
New Universal Local Feature in the Inflationary Perturbation Spectrum
Minu Joy, Varun Sahni, Alexei A. Starobinsky
A model is developed in which the inflaton potential experiences a sudden small change in its second derivative (the effective mass of the inflaton). An exact treatment demonstrate…
What do WMAP and SDSS really tell about inflation?
Julien Lesgourgues, Alexei A. Starobinsky, Wessel Valkenburg
We derive new constraints on the Hubble function H(phi) and subsequently on the inflationary potential V(phi) from WMAP 3-year data combined with the Sloan Luminous Red Galaxy surv…
On Axial and Plane--Mirror Inhomogeneities in the WMAP3 Cosmic Microwave Background Maps
V. G. Gurzadyan, A. A. Starobinsky, A. L. Kashin +2
We study inhomogeneities in the distribution of the excursion sets in the Cosmic Microwave Background (CMB) temperature maps obtained by the three years survey of the Wilkinson Mic…
Disappearing cosmological constant in f(R) gravity
Alexei A. Starobinsky
For higher-derivative f(R) gravity where R is the Ricci scalar, a class of models is proposed which produce viable cosmology different from the LambdaCDM one at recent times and sa…