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Cosmological N-Body Simulations
J. S. Bagla, T. Padmanabhan
In this review we discuss Cosmological N-Body codes with a special emphasis on Particle Mesh codes. We present the mathematical model for each component of N-Body codes. We compare…
Dark Energy: the Cosmological Challenge of the Millennium
T. Padmanabhan
Recent cosmological observations suggest that nearly seventy per cent of the energy density in the universe is unclustered and has negative pressure. Several conceptual issues rela…
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 ($…
Concept of temperature in multi-horizon spacetimes: Analysis of Schwarzschild-De Sitter metric
T. Roy Choudhury, T. Padmanabhan
In case of spacetimes with single horizon, there exist several well-established procedures for relating the surface gravity of the horizon to a thermodynamic temperature. Such proc…
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…