Beyond the Einstein Equation of State: Wald Entropy and Thermodynamical Gravity (2009)
Parikh, Maulik K., Sarkar, Sudipta
We show that the classical equations of gravity follow from a thermodynamic relation, dQ = T dS, where S is taken to be the Wald entropy, applied to a local Rindler horizon at any point in spacetime....
Is gravitational entropy quantized ? (2008)
Kothawala, Dawood, Padmanabhan, T., Sarkar, Sudipta
In Einstein's gravity, the entropy of horizons is proportional to their area. Several arguments given in the literature suggest that, in this context, both area and entropy should be quantized with...
Nicholas A. Friedenberg, Sudipta Sarkar, Nicholas Kouchoukos, Ronald F. Billings, Matthew P. Ayres
Previous studies of the southern pine beetle, Dendroctonus frontalis Zimm., established that its population in east Texas responds to a delayed density-dependent process, whereas no clear role of...
Subleading contributions to the black hole entropy in the brick wall approach (2008)
Sarkar, Sudipta, Shankaranarayanan, Subramaniam, Sriramkumar, L.
The brick wall model is a semiclassical approach to understand the microscopic origin of black hole entropy. In this approach, the black hole geometry is assumed to be a fixed classical background on...
Reservoir monitoring using induced seismicity at a petroleum field in Oman (2008)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2008.
Reservoir monitoring using induced seismicity at a petroleum field in Oman (2008)
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2008.
Sub-leading contributions to the black hole entropy in the brick wall approach (2007)
Sarkar, Sudipta, Shankaranarayanan, S., Sriramkumar, L.
[Abridged] We compute the canonical entropy of a quantum scalar field around static and spherically symmetric black holes through the brick wall approach at the higher orders (in fact, up to the...
Hawking radiation as tunneling for spherically symmetric black holes: A generalized treatment (2007)
Sarkar, Sudipta, Kothawala, Dawood
We present a derivation of Hawking radiation through tunneling mechanism for a general class of asymptotically flat, spherically symmetric spacetimes. The tunneling rate $\Gamma \sim \exp{(\Delta...
Thermodynamics of Horizons from a Dual Quantum System (2007)
Sudipta Sarkar, T. Padmanabhan
It was shown recently that, in the case of Schwarschild black hole, one can obtainthe correct thermodynamic relations by studying a model quantum system and using a partic-ular duality...
Kothawala, Dawood, Sarkar, Sudipta, Padmanabhan, T.
There is an intriguing analogy between the gravitational dynamics of the horizons and thermodynamics. In case of general relativity, as well as for a wider class of Lanczos-Lovelock theories of...
Thermodynamic route to Field equations in Lanczos-Lovelock Gravity (2006)
Paranjape, Aseem, Sarkar, Sudipta, Padmanabhan, T.
Spacetimes with horizons show a resemblance to thermodynamic systems and one can associate the notions of temperature and entropy with them. In the case of Einstein-Hilbert gravity, it is possible to...
Thermodynamics of horizons from a dual quantum system (2006)
Sarkar, Sudipta, Padmanabhan, T.
It was shown recently that, in the case of Schwarschild black hole, one can obtain the correct thermodynamic relations by studying a model quantum system and using a particular duality...
Gupta, Anil K, Sarkar, Sudipta, Mukherjee, Baidehi
Deep-sea benthic foraminifera have been quantitatively analyzed in samples (>125 µm size fraction) from Ocean Drilling Program (ODP) Site 238, to understand paleoceanographic changes in the Central...
Casimir Effect confronts Cosmological Constant (2006)
Mahajan, Gaurang, Sarkar, Sudipta, Padmanabhan, T.
It has been speculated that the zero-point energy of the vacuum, regularized due to the existence of a suitable ultraviolet cut-off scale, could be the source of the non-vanishing cosmological...