170 citations · 528 across the 11 of their papers we have counts for
11 papers
Information retrieval from black holes
Kinjalk Lochan, Sumanta Chakraborty, T. Padmanabhan
It is generally believed that, when matter collapses to form a black hole, the complete information about the initial state of the matter cannot be retrieved by future asymptotic o…
Unruh effect for inertial observers through vacuum correlations
Kinjalk Lochan, Sumanta Chakraborty, T. Padmanabhan
We study a dynamic version of the Unruh effect in a two dimensional collapse model forming a black hole. In this two-dimensional collapse model a scalar field coupled to the dilato…
Variational Principle for Gravity with Null and Non-null boundaries: A Unified Boundary Counter-term
Krishnamohan Parattu, Sumanta Chakraborty, T. Padmanabhan
It is common knowledge that the Einstein-Hilbert action does not furnish a well-posed variational principle. The usual solution to this problem is to add an extra boundary term to…
Thermodynamical interpretation of the geometrical variables associated with null surfaces
Sumanta Chakraborty, T. Padmanabhan
The emergent gravity paradigm interprets gravitational field equations as describing the thermodynamic limit of the underlying statistical mechanics of microscopic degrees of freed…
A quantum peek inside the black hole event horizon
Sumanta Chakraborty, Suprit Singh, T. Padmanabhan
We solve the Klein-Gordon equation for a scalar field, in the background geometry of a dust cloud collapsing to form a black hole, everywhere in the (1+1) spacetime: that is, both…
A Boundary Term for the Gravitational Action with Null Boundaries
Krishnamohan Parattu, Sumanta Chakraborty, Bibhas Ranjan Majhi +1
Constructing a well-posed variational principle is a non-trivial issue in general relativity. For spacelike and timelike boundaries, one knows that the addition of the Gibbons-Hawk…
Black Hole Motion as Catalyst of Orbital Resonances
C. M. Boily, T. Padmanabhan, A. Paiement
The motion of a black hole about the centre of gravity of its host galaxy induces a strong response from the surrounding stellar population. We treat the case of a harmonic potenti…
Response of distance measures to the equation of state
Tarun Deep Saini, T. Padmanabhan, Sarah Bridle
We show that the distance measures (such as the luminosity and angular diameter distances) are linear functionals of the equation-of-state function w(z) of the dark energy to a fai…
The effects of anti-correlation on gravitational clustering
Nissim Kanekar, T. Padmanabhan
We use non-linear scaling relations (NSRs) to investigate the effects arising from the existence of negative correlations on the evolution of gravitational clustering in an expandi…
Nonlinear density evolution from an improved spherical collapse model
S. Engineer, Nissim Kanekar, T. Padmanabhan
We investigate the evolution of non-linear density perturbations by taking into account the effects of deviations from spherical symmetry of a system. Starting from the standard sp…
Pattern in Nonlinear Gravatational Clustering: A Numerical Investigation
T. Padmanabhan, Renyue Cen, Jeremiah P. Ostriker +1
The nonlinear clustering of dark matter particles in an expanding universe is usually studied by N-body simulations. One can gain some insight into this complex problem if simple r…