121 citations · 302 across the 20 of their papers we have counts for
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Gravitational-wave signatures of spinning particles around rotating hairy black holes
Surojit Dalui, Xian-Hui Ge
We study how the spin of a compact secondary and a gravitational-decoupling deformation of the Kerr geometry are imprinted on gravitational waves from strong-field eccentric motion…
Spin-Hair Induced Chaos of Spinning Test Particles in Rotating Hairy Black Holes
Surojit Dalui, Xian-Hui Ge
We investigate the finite-time instability of massive spinning test particles around a rotating hairy black hole generated through gravitational decoupling. The particle motion is…
Chaotic Dynamics in Extremal Black Holes: A Challenge to the Chaos Bound
Surojit Dalui, Chiranjeeb Singha, Krishnakanta Bhattacharya
We investigate chaotic dynamics in extremal black holes by analyzing the motion of massless particles in both Reissner-Nordström and Kerr geometries. Two complementary approaches (…
Chaotic Imprints in Gravitational Waves from Extreme-Mass-Ratio-Inspirals Embedded in Dark Matter Halo
Surajit Das, Surojit Dalui, Bum-Hoon Lee +1
We investigate imprints of chaos in gravitational waves from extreme-mass-ratio inspirals configuration, where a stellar massive object, confined in an external potential as a harm…
Extreme-Mass-Ratio Inspirals Embedded in Dark Matter Halo: Existence of Homoclinic Orbit and Horizon-Induced Chaos
Surajit Das, Surojit Dalui, Bum-Hoon Lee +1
We study the existence of homoclinic orbit and the onset of chaotic motion for a massive particle moving around a Schwarzschild-like black hole embedded in a Dehnen-(1,4,5/2) type…
Dynamical analog spacetimes from nonlinear perturbations in a topological material
Surajit Das, Surojit Dalui, Hrishit Banerjee +1
Emergent spacetime analogs in condensed matter systems have opened a fascinating window into simulating aspects of gravitational physics in controlled laboratory environments. In t…
Probing Chaos in Schwarzschild-de Sitter Spacetime: The Role of Black Hole and Cosmological Horizons
Surojit Dalui, Soumya Bhattacharya, Chiranjeeb Singha
In this paper, we study the motion of a massless, chargeless particle in Schwarzschild-de Sitter spacetime, revealing exponential radial growth and potential chaos in an integrable…
Near-horizon chaos beyond Einstein gravity
Surajit Das, Surojit Dalui, Rickmoy Samanta
We investigate chaos in the dynamics of massless particles near the horizon of static spherically symmetric black holes in two well-motivated models of gravity. In both thes…
Spinning Black Hole in a Fluid
Surojit Dalui, Arpan Krishna Mitra, Deeshani Mitra +1
In this paper, we propose a new Analogue Gravity example - a spinning (or Kerr) Black Hole in an extended fluid model. The fluid model receives Berry curvature contributions and ap…
Unveilling Chaos in Particle Motion: Analyzing the Impact of Horizon in Gravity
Surajit Das, Surojit Dalui
This article is devoted to investigate the effects of theory in the dynamics of a massless particle near the horizon of a static spherically symmetric (SSS) black hole. Deri…
Acoustic Kerr Metric in Analogue Gravity
Deeshani Mitra, Surojit Dalui, Subir Ghosh +1
The present paper is based on a previous work (involving two of the present authors) where a generalized fluid dynamical model was proposed. The underlying symplectic structure of…
Thermal nature of a generic null surface
Surojit Dalui, Bibhas Ranjan Majhi, T. Padmanabhan
Dynamical properties of a generic null surface are known to have a thermodynamic interpretation. Such an interpretation is completely based on an analogy between the usual law of t…
Quantum corrections enhance chaos: study of particle motion near a generalized Schwarzschild black hole
Avijit Bera, Surojit Dalui, Subir Ghosh +1
The paper is devoted to a detailed study of the effects of quantum corrections on the chaotic behavior in the dynamics of a (massless) probe particle near the horizon of a generali…
Horizon thermalization of Kerr black hole through local instability
Surojit Dalui, Bibhas Ranjan Majhi
The validity of our already proposed conjecture -- {\it horizon creates a local instability which acts as the source of the quantum temperature of black hole} -- is being tested he…
Near horizon local instability and quantum thermality
Surojit Dalui, Bibhas Ranjan Majhi
We revisit our previous proposed conjecture -- horizon creates a local instability which acts as the source of quantum temperature of black hole. It is found that a chargesless mas…
Horizon induces instability locally and creates quantum thermality
Surojit Dalui, Bibhas Ranjan Majhi, Pankaj Mishra
The classical Hamiltonian for a chargeless and massless particle in a very near horizon region is shown to be of the form as long as radial motion is concerned. This is…
Induction of chaotic fluctuations in particle dynamics in a uniformly accelerated frame
Surojit Dalui, Bibhas Ranjan Majhi, Pankaj Mishra
The ongoing conjecture that the presence of horizon may induce chaos in an integrable system, is further investigated from the perspective of a uniformly accelerated frame. Particu…
How robust is the indistinguishability between quantum fluctuation seen from non-inertial frame and real thermal bath
Chandramouli Chowdhury, Susmita Das, Surojit Dalui +1
We re-advocated the conjecture of indistinguishability between the quantum fluctuation observed from a Rindler frame and a real thermal bath, for the case of a free massless scalar…
Conformal Vacuum and Fluctuation-Dissipation in de-Sitter Universe and Black Hole Spacetimes
Ashmita Das, Surojit Dalui, Chandramouli Chowdhury +1
In the studies of quantum field theory in curved spacetime, the ambiguous concept of vacuum state and the particle content is a long-standing debatable aspect. So far it is well kn…
Presence of horizon makes particle motion chaotic
Surojit Dalui, Bibhas Ranjan Majhi, Pankaj Mishra
We analyze the motion of a {\it massless} and {\it chargeless} particle very near to the event horizon. It reveals that the radial motion has exponential growing nature which indic…