10 citations · 35 across the 14 of their papers we have counts for
14 papers
Necessary conditions for causality from linearized stability at ultra-high boosts
Shuvayu Roy, Sukanya Mitra, Rajeev Singh
In this work, we provide a novel method to constrain the causal parameter space of a relativistic hydrodynamic system exclusively from its linear stability analysis at non-zero mom…
Stochastic Evolution of Primordial Black Holes to near-extremality in EFTs of Gravity
Soham Acharya, Shuvayu Roy, Sudipta Sarkar
The search for dark matter candidates includes primordial black holes (PBHs) as possible constituents. Recent studies show that some PBHs can survive to the present epoch by gainin…
Relativistic Dispersion Spectra across Lorentz boosted frames: Spurious modes and the enigma of causality
Sayantani Bhattacharyya, Sukanya Mitra, Shuvayu Roy +1
The analysis of excitation spectra in gradient-expanded relativistic fluid theories frequently leads to pathologies under Lorentz boosts. However, extracting the dispersion modes i…
Ladder Symmetry: The Necessary and Sufficient Condition for Vanishing Love Numbers
Chanchal Sharma, Shuvayu Roy, Sudipta Sarkar
Black holes in four-dimensional, asymptotically flat general relativity have vanishing static tidal Love numbers (TLNs), a property tied to a hidden symmetry of the perturbation eq…
EFT Corrections to Majumdar-Papapetrou Black Holes
Soham Acharya, Shuvayu Roy, Sudipta Sarkar
Recent studies on extremal black holes within effective field theories (EFT) of gravity have revealed an intriguing phenomenon: tidal forces near the horizon experience significant…
Relativistic fluid dynamics in a 'hydro' frame
Sayantani Bhattacharyya, Sukanya Mitra, Shuvayu Roy +1
In this letter, we investigate how field redefinition influences the spectrum of linearized perturbations in relativistic fluid dynamics. We show that the hydrodynamic modes do not…
Field redefinition and its impact in relativistic hydrodynamics
Sayantani Bhattacharyya, Sukanya Mitra, Shuvayu Roy +1
In this paper, we explore the impact of field redefinition on the spectrum of linearized perturbations in relativistic hydrodynamics. We observe that the spectrum of hydrodynamics…
Causality and stability in relativistic hydrodynamic theory -- a choice to be endured
Sayantani Bhattacharyya, Sukanya Mitra, Shuvayu Roy
In this work, it has been indicated that the key features requisite for preserving causality and stability of the popularly existing relativistic hydrodynamic theories, can be tran…
Iyer-Wald ambiguities and gauge covariance of Entropy current in Higher derivative theories of gravity
Alokananda Kar, Prateksh Dhivakar, Shuvayu Roy +2
In [arXiv:2105.06455, arXiv:2206.04538], the authors have been able to argue for an ultra-local version of the second law of black hole mechanics, for arbitrary diffeomorphism inva…
Frame transformation and stable-causal hydrodynamic theory
Sayantani Bhattacharyya, Sukanya Mitra, Shuvayu Roy
In this work, a connection has been indicated between the different existing formulations of relativistic hydrodynamic theories, which, in order to be causal and stable, (i) either…
Causality Criteria from Stability Analysis at Ultra-High Boost
Shuvayu Roy, Sukanya Mitra
In this work, we have exclusively employed the linear stability analysis at ultra-high boost on two well-known stable-causal theories - second-order MIS and first-order BDNK, to id…
Entropy Current and Fluid-Gravity Duality in Gauss-Bonnet theory
Chandranathan A, Sayantani Bhattacharyya, Milan Patra +1
Working within the approximation of small amplitude expansion, recently an entropy current has been constructed on the horizons of dynamical black hole solution in any higher deriv…
Reparametrization Symmetry of Local Entropy Production on a Dynamical Horizon
Sayantani Bhattacharyya, Pooja Jethwani, Milan Patra +1
Recently, it has been shown that for a dynamical black hole in any higher derivative theory of gravity, one could construct a spatial entropy current, characterizing the in/outflow…
An entropy current and the second law in higher derivative theories of gravity
Sayantani Bhattacharyya, Prateksh Dhivakar, Anirban Dinda +3
We construct a proof of the second law of thermodynamics in an arbitrary diffeomorphism invariant theory of gravity working within the approximation of linearized dynamical fluctua…