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85 papers
Microscopic origin of Einstein's field equations and the raison d'être for a positive cosmological constant
T. Padmanabhan, Sumanta Chakraborty
In the paradigm of effective field theory, one hierarchically obtains the effective action for some low(er) energy degrees of freedom , by int…
Thermal nature of a generic null surface
Surojit Dalui, Bibhas Ranjan Majhi, T. Padmanabhan
Dynamical properties of a generic null surface are known to have a thermodynamic interpretation. Such an interpretation is completely based on an analogy between the usual law of t…
World-line Path integral for the Propagator expressed as an ordinary integral: Concept and Applications
T. Padmanabhan
The (Feynman) propagator encodes the entire dynamics of a massive, free scalar field propagating in an arbitrary curved spacetime. The usual procedures for computing t…
Eddington gravity with matter: An emergent perspective
Sumanta Chakraborty, T. Padmanabhan
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 equa…
A class of QFTs with higher derivative field equations leading to standard dispersion relation for the particle excitations
T. Padmanabhan
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, o…
Gravitational effective action at mesoscopic scales from the quantum microstructure of spacetime
T. Padmanabhan
At mesoscopic scales, the quantum corrected field equations of gravity should arise from extremizing, , the number of microscopic configurations of pre-geometric variables consi…