16 citations · 121 across the 20 of their papers we have counts for
21 papers
Can a quantum circuit detect the Unruh effect?
Pravin Kumar Dahal, Timothy C. Ralph, William J. Munro +2
The Unruh effect predicts that an accelerating observer perceives the Minkowski vacuum as a thermal bath, yet direct detection remains experimentally inaccessible. Its timelike cou…
Collective Enhancement of Nuclear Excitation for a Nuclear Quantum Battery
Pravin Kumar Dahal, Kieran Hymas, Jack Muir +1
Current implementations of quantum batteries are constrained by limited energy density and short retention times associated with the electronic or molecular excitations. Here we pr…
Spatiotemporal entanglement of the vacuum
Pravin Kumar Dahal, Kieran Hymas
We demonstrate that the future and left Rindler wedges of Minkowski spacetime are entangled, leading to the Unruh effect. Similarly, the past and right Rindler wedges are also enta…
The Hawking temperature of dynamical black holes via conformal transformations
Pravin Kumar Dahal, Swayamsiddha Maharana
In this second part of our two-series on extracting the Hawking temperature of dynamical black holes, we focus into spacetimes that are conformal transformations of static spacetim…
Models of cosmological black holes
Pravin K. Dahal, Swayamsiddha Maharana, Fil Simovic +2
We study various aspects of modeling astrophysical black holes using the recently introduced semiclassical formalism of physical black holes (PBHs). This approach is based on the m…
Horizon-bound objects: Kerr--Vaidya solutions
Pravin K. Dahal, Swayamsiddha Maharana, Fil Simovic +1
Kerr-Vaidya metrics are the simplest dynamical axially-symmetric solutions, all of which violate the null energy condition and thus are consistent with the formation of a trapped r…
Surface gravity from tidal acceleration
Pravin Kumar Dahal
Surface gravity plays a pivotal role in the characterization of black holes and also in formulating the laws of black hole thermodynamics. Despite its significance, defining surfac…
The Hawking temperature of dynamical black holes via Rindler transformations
Pravin Kumar Dahal, Fil Simovic
The Vaidya metric serves as a useful model-building tool that captures many essential features of dynamical and/or evaporating black hole spacetimes. Working in a semiclassical set…
Light propagation in Kerr spacetime
Pravin Kumar Dahal
We explicitly solve the equations for the propagation of an electromagnetic wave up to the subleading order geometric optics expansion in the Kerr spacetime. This is done in two no…
Black holes as spherically-symmetric horizon-bound objects
Pravin K. Dahal, Fil Simovic, Ioannis Soranidis +1
Working in a semi-classical setting, we consider solutions of the Einstein equations that exhibit light trapping in finite time according to distant observers. In spherical symmetr…
Matter and forces near physical black holes
Pravin Kumar Dahal, Ioannis Soranidis, Daniel R. Terno
We describe general features of formation and disappearance of regular spherically symmetric black holes in semiclassical gravity. The allowed models are critically dependent on th…
Covariant formulation of spin optics for electromagnetic waves
Pravin Kumar Dahal
We develop geometric optics expansion up to the subleading order for circularly polarized electromagnetic waves on curved spacetime. This subleading order geometric optics expansio…
Alternative characterization of a black hole boundary
Pravin Kumar Dahal
After reviewing the shortcomings of existing definitions used to characterize the boundary of a black hole, we present a new method for its characterization. This definition could…
Light rays in the Solar system experiments: phases and displacements
Pravin Kumar Dahal, Daniel R. Terno
Geometric optics approximation is sufficient to describe the effects in the near-Earth environment. In this framework Faraday rotation is purely a reference frame (gauge) effect. H…
Semiclassical black holes and horizon singularities
Pravin K. Dahal, Sebastian Murk, Daniel R. Terno
In spherical symmetry, solutions of the semiclassical Einstein equations belong to one of two possible classes. Both classes contain solutions that -- depending on the dynamic beha…
Spin optics for gravitational waves
Pravin Kumar Dahal
We present the geometric optics expansion for circularly polarized gravitational waves on a curved spacetime background, to subleading order. We call spin optics to the subleading…
Polarization rotation and near-Earth quantum communications
Pravin Kumar Dahal, Daniel R. Terno
We revisit polarization rotation due to gravity, known as the gravitational Faraday effect, with a view on its role in quantum communications with Earth-orbiting satellites. In a s…
Trapped region in Kerr-Vaidya space-time
Pravin Kumar Dahal
We review the basic definitions and properties of trapped surfaces and discuss them in the context of Kerr-Vaidya line-element. Our study shows that the apparent horizon does not e…
Properties of space-time in the vicinity of trapped regions
Pravin Kumar Dahal
We investigate the near horizon geometry of the simplest representative of the class of axisymmetric space-times: the Kerr Vaidya metrics. Kerr Vaidya metrics can be derived from t…
Kerr-Vaidya black holes
Pravin Kumar Dahal, Daniel R. Terno
Kerr-Vaidya metrics are the simplest nonstationary extensions of the Kerr metric. We explore their properties and compare them with the near-horizon limits of the spherically symme…
Review of Pulsar Timing Array for Gravitational Wave Research
Pravin Kumar Dahal
Ongoing research on Pulsar Timing Array (PTA) to detect gravitational radiation is reviewed. Here, we discuss the use of millisecond pulsars as a gravitational wave detector, the s…