74 citations · 1.1k across the 62 of their papers we have counts for
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Index saddle for the D1-D5-P black string and its decoupling limit
Kanhu Kishore Nanda, P Shanmugapriya, Amitabh Virmani
Boruch, Emparan, Iliesiu, and Murthy recently discussed index saddles for 5d black strings, showing that the black string saddle admits a decoupling limit to a complex, finite-temp…
Index saddle for supersymmetric F1-P black ring
Pavan Dharanipragada, Gurmeet Singh Punia, Amitabh Virmani
We construct the index saddle for the supersymmetric F1--P black ring. Our construction proceeds by taking a supersymmetric limit of a non-supersymmetric doubly spinning F1--P blac…
Non-supersymmetric F1-P black rings
Pavan Dharanipragada, Gurmeet Singh Punia, Amitabh Virmani
We construct singly and doubly spinning non-supersymmetric F1--P black ring solutions in five-dimensional supergravity. These black rings have regular horizons and non-zero tempera…
BPS Solutions of 4d Euclidean N=2 Supergravity with Higher Derivative Interactions
Soumya Adhikari, Abhinava Bhattacharjee, Amitabh Virmani
We study fully BPS and a broad class of half-BPS stationary configurations of four-dimensional Euclidean N=2 supergravity with higher-derivative interactions. Working within the of…
The gravitational index of a small black ring
Subhodip Bandyopadhyay, Gurmeet Singh Punia, Yogesh K. Srivastava +1
Certain supersymmetric elementary string states with angular momentum can be viewed as small black rings in a five-dimensional string theory. These black rings have zero area event…
Supersymmetric Index for Half BPS Black Holes in N=2 Supergravity with Higher Curvature Corrections
Subramanya Hegde, Ashoke Sen, P Shanmugapriya +1
We compute the supersymmetric index of half BPS black holes in N=2 supergravity with higher curvature corrections and show that the result agrees with the degeneracy of supersymmet…
Attractor saddle for 5D black hole index
Soumya Adhikari, Pavan Dharanipragada, Kaberi Goswami +1
In a recent paper, Anupam, Chowdhury, and Sen [arXiv:2308.00038] constructed the non-extremal saddle that reproduces the supersymmetric index of the BMPV black hole with three inde…
Supersymmetric Black Hole Hair and AdS_3 x S^3
Subhodip Bandyopadhyay, Yogesh K. Srivastava, Amitabh Virmani
The 4D-5D connection allows us to view the same near horizon geometry as part of a 4D black hole or a 5D black hole. A much studied example of this phenomenon is the BMPV black hol…
Supersymmetric Index for Small Black Holes
Chandramouli Chowdhury, Ashoke Sen, P. Shanmugapriya +1
Supersymmetric elementary string states in the compactified heterotic string theory are described by small black holes that have zero area event horizon. In this paper we compute t…
Killing Spinors for Finite Temperature Euclidean Solutions at the BPS Bound
Subramanya Hegde, Amitabh Virmani
In a recent paper [arXiv:2308.00038], Anupam, Chowdhury, and Sen conjectured that the finite temperature Euclidean five-dimensional Cvetic-Youm solution saturating the BPS bound is…
Positivity of discrete information for CHL black holes
Suresh Govindarajan, Sutapa Samanta, P Shanmugapriya +1
Black holes carry more information about the microstates than just the total degeneracy. As a concrete example, the Z(N)-twined helicity trace indices for 1/4-BPS black holes of th…
Thermodynamics of BPS and Near-BPS AdS6 Black Holes
Madhu Mishra, Amitabh Virmani
We develop the thermodynamics of BPS and near-BPS AdS6 black holes. We study the phase diagram of BPS black holes in the grand canonical ensemble. We highlight two distinct deforma…
Supertranslations at Timelike Infinity
Sumanta Chakraborty, Debodirna Ghosh, Sk Jahanur Hoque +2
We propose a definition of asymptotic flatness at timelike infinity in four spacetime dimensions. We present a detailed study of the asymptotic equations of motion and the action o…
Black Hole Hair Removal For N=4 CHL Models
Subhroneel Chakrabarti, Suresh Govindarajan, P Shanmugapriya +2
Although BMPV black holes in flat space and in Taub-NUT space have identical near-horizon geometries, they have different indices from the microscopic analysis. For K3 compactifica…
Horizon Hair from Inversion Symmetry
Karan Fernandes, Debodirna Ghosh, Amitabh Virmani
The extreme Reissner-Nordström solution has a discrete conformal isometry that maps the future event horizon to future null infinity and vice versa, the Couch-Torrence inversion is…
First law of black hole mechanics with fermions
P. B. Aneesh, Sumanta Chakraborty, Sk Jahanur Hoque +1
In the last few years, there has been significant interest in understanding the stationary comparison version of the first law of black hole mechanics in the vielbein formulation o…
Quasinormal modes of supersymmetric microstate geometries from the D1-D5 CFT
Bidisha Chakrabarty, Debodirna Ghosh, Amitabh Virmani
We revisit the study of the probe scalar quasinormal modes of a class of three-charge supersymmetric microstate geometries. We compute the real and imaginary parts of the quasinorm…
Conserved charges in asymptotically de Sitter spacetimes
P B Aneesh, Sk Jahanur Hoque, Amitabh Virmani
We present a covariant phase space construction of hamiltonian generators of asymptotic symmetries with `Dirichlet' boundary conditions in de Sitter spacetime, extending a previous…
Generalised Garfinkle-Vachaspati Transform With Dilaton
Subhroneel Chakrabarti, Deepali Mishra, Yogesh K. Srivastava +1
The generalised Garfinkle-Vachaspati transform (GGV) introduced in our previous work (arXiv:1808.04981) is a powerful technique to add hair modes to a class of known D1-D5 solution…
A Generalised Garfinkle-Vachaspati Transform
Deepali Mishra, Yogesh K. Srivastava, Amitabh Virmani
The Garfinkle-Vachaspati transform is a deformation of a metric in terms of a null, hypersurface orthogonal, Killing vector . We explore a generalisation of this deformation i…
Geroch Group Description of Bubbling Geometries
Pratik Roy, Amitabh Virmani
The Riemann-Hilbert approach to studying solutions of supergravity theories allows us to associate spacetime independent monodromy matrices (matrices in the Geroch group) with solu…
Oscillating Shells and Oscillating Balls in AdS
Avik Banerjee, Arnab Kundu, Pratik Roy +1
It has recently been reported that certain thin timelike shells undergo oscillatory motion in AdS. In this paper, we compute two-point function of a probe field in the geodesic app…
Hair on non-extremal D1-D5 bound states
Pratik Roy, Yogesh K. Srivastava, Amitabh Virmani
We consider a truncation of type IIB supergravity on four-torus where in addition to the Ramond-Ramond 2-form field, the Ramond-Ramond axion (w) and the NS-NS 2-form field (B) are…
Internal Structure of Charged AdS Black Holes
Srijit Bhattacharjee, Sudipta Sarkar, Amitabh Virmani
When an electrically charged black hole is perturbed its inner horizon becomes a singularity, often referred to as the Poisson-Israel mass inflation singularity. Ori constructed a…