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pro vyhledávání: '"Thanu Padmanabhan"'
Autor:
Thanu Padmanabhan
Publikováno v:
Entropy, Vol 17, Iss 11, Pp 7420-7452 (2015)
The fact that the equations of motion for matter remain invariant when a constant is added to the Lagrangian suggests postulating that the field equations of gravity should also respect this symmetry. This principle implies that: (1) the metric canno
Externí odkaz:
https://doaj.org/article/81fcf1eebfd54fc0ba8c003bb9d6d457
Autor:
Thanu Padmanabhan
Quantum theory is one of the more abstract branches of theoretical physics, yet it makes clear and concrete predictions which are repeatedly verified experimentally. More recently, there has been some confluence between the concepts of microphysics a
Autor:
Thanu Padmanabhan
This unique book provides a clear and lucid description of several aspects of astrophysics and cosmology in a language understandable to a physicist or beginner in astrophysics. It presents the key topics in all branches of astrophysics and cosmology
Autor:
Thanu Padmanabhan
Publikováno v:
International Journal of Modern Physics D. 30
The gravitational dynamics of the coarse-grained spacetime geometry should emerge from extremizing the number of microscopic configurations, [Formula: see text], of the pre-geometric variables corresponding to a given geometry. This [Formula: see tex
Autor:
Thanu Padmanabhan
The (Feynman) propagator $G(x_2,x_1)$ encodes the entire dynamics of a massive, free scalar field propagating in an arbitrary curved spacetime. The usual procedures for computing the propagator -- either as a time ordered correlator or from a partiti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::43212a84a8787fb7c0b3db06f1014b83
http://arxiv.org/abs/2104.07041
http://arxiv.org/abs/2104.07041
Autor:
Sumanta Chakraborty, Thanu Padmanabhan
Publikováno v:
Physical Review D. 103
We describe an action principle, within the framework of the Eddington gravity, which incorporates the matter fields in a simple manner. Interestingly, the gravitational field equations derived from this action is identical to the Einstein's equation
Publikováno v:
Powers of Two ISBN: 9783030583446
Both in physics (in vivo) and in Information Theory (in vitro) the total amount of information in a confined system is perceived as entropy: S in physics, i in Information Technology.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9809fef01f56feaf9e7059bcadedcd5e
https://doi.org/10.1007/978-3-030-58345-3_5
https://doi.org/10.1007/978-3-030-58345-3_5
Autor:
Thanu Padmanabhan
Publikováno v:
Physics Letters
Physics Letters B, Vol 811, Iss, Pp 135912-(2020)
Physics Letters B, Vol 811, Iss, Pp 135912-(2020)
Given any (Feynman) propagator which is Lorentz and translation invariant, it is possible to construct an action functional for a scalar field such that the quantum field theory, obtained by path integral quantization, leads to this propagator. In ge
Autor:
Thanu Padmanabhan
Publikováno v:
Physics Letters B, Vol 809, Iss, Pp 135774-(2020)
Physics Letters
Physics Letters
At mesoscopic scales, close to but somewhat larger than Planck length, one can describe the spacetime in terms of an effective geometry. The key feature of such an effective (quantum) geometry is the existence of a zero-point-length which, for exampl
Autor:
Thanu Padmanabhan
Publikováno v:
General Relativity and Gravitation. 52
Principle of Equivalence makes effects of classical gravity vanish in local inertial frames. What role does the Principle of Equivalence play as regards quantum gravitational effects in the local inertial frames? I address this question here from a s