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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…
Path integrals for the relativistic particle: Some conceptual and pedagogical comments
T. Padmanabhan
In my textbook on Quantum Field Theory \cite{tpqft} and in a recent paper \cite{tpejc2018}, I advocated a lattice regularization procedure for defining the path integral for the re…
Zero modes and divergence of entanglement entropy
Krishnanand Mallayya, Rakesh Tibrewala, S. Shankaranarayanan +1
We investigate the cause of the divergence of the entanglement entropy for the free scalar fields in and dimensional space-times. In a canonically equivalent set…
The Physical Principle that determines the Value of the Cosmological Constant
T. Padmanabhan
Observations indicate that the evolution of our universe can be divided into three epochs consisting of early time inflation, radiation (and matter) domination and the late time ac…
Emergence and Expansion of Cosmic Space as due to the Quest for Holographic Equipartition
T. Padmanabhan
One possible interpretation of the holographic principle is the equality of the number of degrees of freedom in a bulk region of space and the number of degrees of freedom on the b…
Path integral duality modified propagators in spacetimes with constant curvature
Dawood Kothawala, L. Sriramkumar, S. Shankaranarayanan +1
The hypothesis of path integral duality provides a prescription to evaluate the propagator of a free, quantum scalar field in a given classical background, taking into account the…