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8 papers · 1 filter
Gravitational Collapse in an Expanding Universe: Scaling Relations for Two-Dimensional Collapse Revisited
S. Ray, J. S. Bagla, T. Padmanabhan
We investigate non-linear scaling relations for two-dimensional gravitational collapse in an expanding background using a 2D TreePM code and study the strongly non-linear regime ($…
Nonlinear current helicity fluxes in turbulent dynamos and alpha quenching
Kandaswamy Subramanian, Axel Brandenburg
Large scale dynamos produce small scale current helicity as a waste product that quenches the large scale dynamo process (alpha effect). This quenching can be catastrophic (i.e.int…
Loop Quantum Gravity and the Cyclic Universe
Martin Bojowald, Roy Maartens, Parampreet Singh
Loop quantum gravity introduces strong non-perturbative modifications to the dynamical equations in the semi-classical regime, which are responsible for various novel effects, incl…
Possible evidence of surface vibration of strange stars from stellar observations
Subharthi Ray, Jishnu Dey, Mira Dey +1
Emission lines in the eV and keV range by certain stellar candidates from their recent analysis invoke the question of their possible origin. These stars under consideration, are t…
CMB power spectrum estimation using noncircular beams
Sanjit Mitra, Anand S. Sengupta, Tarun Souradeep
The measurements of the angular power spectrum of the Cosmic Microwave Background (CMB) anisotropy has proved crucial to the emergence of cosmology as a precision science in recent…
WMAP constraints on low redshift evolution of dark energy
H. K. Jassal, J. S. Bagla, T. Padmanabhan
The conceptual difficulties associated with a cosmological constant have led to the investigation of alternative models in which the equation of state parameter, , of the da…