157 citations · 1.6k across the 42 of their papers we have counts for
42 papers
BRST Symmetry and the Convolutional Double Copy
Mahdi Godazgar, C. N. Pope, A. Saha +1
Motivated by the results of Anastasiou et al., we consider the convolutional double copy for BRST and anti-BRST covariant formulations of gravitational and gauge theories in more d…
Gravitational memory effects and higher derivative actions
Mahdi Godazgar, George Macaulay, Ali Seraj
We show that charges associated with the internal Lorentz symmetries of general relativity, with higher derivative boundary terms included in the action, capture observable gravita…
Eigenvalue repulsions and quasinormal mode spectra of Kerr-Newman: an extended study
Oscar J. C. Dias, Mahdi Godazgar, Jorge E. Santos
The frequency spectra of the gravito-electromagnetic perturbations of the Kerr-Newman (KN) black hole with the slowest decay rate have been computed recently. It has been found tha…
Dual Charges for AdS Spacetimes and the First Law of Black Hole Mechanics
Mahdi Godazgar, Simon Guisset
We apply the recent derivations of dual charges in asymptotically flat spacetimes to asymptotically locally AdS spacetimes. In contrast to the results in the flat case, in the AdS…
Higher derivative asymptotic charges and internal Lorentz symmetries
Mahdi Godazgar, George Macaulay
In line with a recent proposal for the study of asymptotic gravitational charges, we investigate higher derivative asymptotic charges. We show that the higher derivative BMS charge…
Eigenvalue repulsions in the quasinormal spectra of the Kerr-Newman black hole
Oscar J. C. Dias, Mahdi Godazgar, Jorge E. Santos +3
We study the gravito-electromagnetic perturbations of the Kerr-Newman (KN) black hole metric and identify the two photon sphere and near-horizon families of quasinormal mod…
Constraints on Kerr-Newman black holes from merger-ringdown gravitational-wave observations
Gregorio Carullo, Danny Laghi, Nathan K. Johnson-McDaniel +4
We construct a template to model the post-merger phase of a binary black hole coalescence in the presence of a remnant charge. We include the quasi-normal modes typically do…
Asymptotic Weyl Double Copy
Hadi Godazgar, Mahdi Godazgar, Ricardo Monteiro +2
A characteristic value formulation of the Weyl double copy leads to an asymptotic formulation. We find that the Weyl double copy holds asymptotically in cases where the full soluti…
The Weyl Double Copy for Gravitational Waves
Hadi Godazgar, Mahdi Godazgar, Ricardo Monteiro +2
We establish the status of the Weyl double copy relation for radiative solutions of the vacuum Einstein equations. We show that all type N vacuum solutions, which describe the radi…
BMS charges in polyhomogeneous spacetimes
Mahdi Godazgar, George Long
We classify the asymptotic charges of a class of polyhomogeneous asymptotically-flat spacetimes with finite shear, generalising recent results on smooth asymptotically-flat spaceti…
Hamiltonian derivation of dual gravitational charges
Hadi Godazgar, Mahdi Godazgar, Malcolm J. Perry
We provide a Hamiltonian derivation of recently discovered dual BMS charges. In order to do so, we work in the first order formalism and add to the usual Palatini action, the Holst…
Asymptotic gravitational charges
Hadi Godazgar, Mahdi Godazgar, Malcolm J. Perry
We present a method for finding, in principle, all asymptotic gravitational charges. The basic idea is that one must consider all possible contributions to the action that do not a…
Taub-NUT from the Dirac monopole
Hadi Godazgar, Mahdi Godazgar, C. N. Pope
Writing the metric of an asymptotically flat spacetime in Bondi coordinates provides an elegant way of formulating the Einstein equation as a characteristic value problem. In this…
Dual gravitational charges and soft theorems
Hadi Godazgar, Mahdi Godazgar, C. N. Pope
We consider the consequences of the dual gravitational charges for the phase space of radiating modes, and find that they imply a new soft NUT theorem. In particular, we argue that…
New dual gravitational charges
Hadi Godazgar, Mahdi Godazgar, C. N. Pope
We show that there are a further infinite number of, previously unknown, supertranslation charges. These can be viewed as duals of the known BMS charges corresponding to supertrans…
Tower of subleading dual BMS charges
Hadi Godazgar, Mahdi Godazgar, C. N. Pope
We supplement the recently found dual gravitational charges with dual charges for the whole BMS symmetry algebra. Furthermore, we extend the dual charges away from null infinity, d…
Subleading BMS charges and fake news near null infinity
Hadi Godazgar, Mahdi Godazgar, C. N. Pope
In this paper we establish a relation between the non-linearly conserved Newman-Penrose charges and certain subleading terms in a large- expansion of the BMS charges in an asymp…
Penrose quasi-local energy and Kerr-Schild metrics
Mahdi Godazgar, Andre Kaderli
Specialising to the case of Kerr-Schild spacetimes, which include the Kerr black hole and gravitational wave solutions, we propose a modification of the Penrose quasi-local energy.…
Aretakis Charges and Asymptotic Null Infinity
Hadi Godazgar, Mahdi Godazgar, C. N. Pope
We construct a relation between the Aretakis charge of any extreme black hole and the Newman-Penrose charge. This is achieved by constructing a conformal correspondence between ext…
Symmetries at the black hole horizon
Emil T. Akhmedov, Mahdi Godazgar
We determine the asymptotic symmetry group of Killing horizons by choosing Gaussian null coordinates in the neighbourhood of the horizon and boundary conditions that respect the le…
Entanglement entropy, the Einstein equation and the Sparling construction
Mahdi Godazgar
We relate the recent derivation of the linearised Einstein equation on an AdS background from holographic entanglement entropy arguments to the Sparling construction: we derive the…
The Embedding of Gauged STU Supergravity in Eleven Dimensions
Arash Azizi, Hadi Godazgar, Mahdi Godazgar +1
The consistency of the embedding of four-dimensional SO(8) gauged N=8 supergravity into eleven-dimensional supergravity, where the internal directions are compactified on a seven-s…
Twisting algebraically special solutions in five dimensions
Gabriel Bernardi de Freitas, Mahdi Godazgar, Harvey S. Reall
We determine the general form of the solutions of the five-dimensional vacuum Einstein equations with cosmological constant for which (i) the Weyl tensor is everywhere type II or m…
Consistent 4-form fluxes for maximal supergravity
Hadi Godazgar, Mahdi Godazgar, Olaf Krueger +1
We derive new ansaetze for the 4-form field strength of D=11 supergravity corresponding to uplifts of four-dimensional maximal gauged supergravity. In particular, the ansaetze dire…