246 citations · 1.6k across the 57 of their papers we have counts for
8 papers · 1 filter
Unruh model for the Einstein-Rosen charge: Squealing Wormholes?
K. K. Nandi, D. H. Xu
We present two kinds of acoustic models for the massless electric charge conceived by Einstein and Rosen in the form of a bridge (wormhole throat). It is found that the first kind…
omega dependence of the scalar field in Brans-Dicke theory
A. Bhadra, K. K. Nandi
This article examines the claim that the Brans-Dicke scalar field ϕ\to ϕ_{0} + O(1/\sqrtω) for large when the matter field is traceless. It is argued that such a claim can not…
Acoustic Wormholes
Kamal Kanti Nandi, Yuan-Zhong Zhang, Rong-Gen Cai
Acoustic analogs of static, spherically symmetric massive traversable Lorentzian wormholes are constructed as a {\em formal} extension of acoustic black holes. The method is straig…
A Semiclassical ANEC Constraint On Classical Traversable Lorentzian Wormholes
Kamal K. Nandi, Yuan-Zhong Zhang, Nail G. Migranov
The present article lies at the interface between gravity, a highly nonlinear phenomenon, and quantum field theory. The nonlinear field equations of Einstein permit the theoretical…
Semiclassical and Quantum Field Theoretic Bounds for Traversable Lorentzian Stringy Wormholes
Kamal Kanti Nandi, Yuan-Zhong Zhang, K. B. Vijaya Kumar
A lower bound on the size of a Lorentzian wormhole can be obtained by semiclassically introducing the Planck cut-off on the magnitude of tidal forces (Horowitz-Ross constraint). Al…
Volume Integral Theorem for Exotic Matter
Kamal Kanti Nandi, Yuan-Zhong Zhang, K. B. Vijaya Kumar
We answer an important question in general relativity about the volume integral theorem for exotic matter by suggesting an exact integral quantifier for matter violating Averaged N…