165 citations · 2.7k across the 80 of their papers we have counts for
80 papers
Holographic timelike complexity for de Sitter
Arpan Bhattacharyya, Md Khalid Hossain, Sanhita Parihar +1
We investigate the recent proposal of holographic volume complexity for timelike subregions \cite{Alishahiha:2025xml} in the framework of static patch holography for de Sitter spac…
Probing the self-coherence of primordial quantum fluctuations with complexity
Arpan Bhattacharyya, Suddhasattwa Brahma, S. Shajidul Haque +2
A smoking gun for our current paradigm of the early universe would be direct evidence for the quantum mechanical origin of density perturbations which are conjectured to seed the l…
Benchmarking quantum chaos from geometric complexity
Arpan Bhattacharyya, Suddhasattwa Brahma, Satyaki Chowdhury +1
Recent studies have shown that there is a strong interplay between quantum complexity and quantum chaos. In this work, we consider a new method to study geometric complexity for in…
The Early Universe as an Open Quantum System: Complexity and Decoherence
Arpan Bhattacharyya, Suddhasattwa Brahma, S. Shajidul Haque +2
In this work, we extend previous results, demonstrating how complexity in an open quantum system can identify decoherence between two fields, even in the presence of an acceleratin…
Kibble-Zurek mechanism and errors of gapped quantum phases
Amit Jamadagni, Javad Kazemi, Arpan Bhattacharyya
Kibble-Zurek mechanism relates the domain of non-equilibrium dynamics with the critical properties at equilibrium. It establishes a power law connection between non-equilibrium def…
CFT reconstruction of local bulk operators in half-Minkowski space
Arpan Bhattacharyya, Manas Dogra, Shubho R. Roy
We construct a holographic map that reconstructs massless fields (scalars, Maxwell field \& Fierz-Pauli field) in half-Minkowski spacetime in dimensions terms of smeared prim…
Krylov Complexity and Spectral Form Factor for Noisy Random Matrix Models
Arpan Bhattacharyya, S. Shajidul Haque, Ghadir Jafari +2
We study the spectral properties of two classes of random matrix models: non-Gaussian RMT with quartic and sextic potentials, and RMT with Gaussian noise. We compute and analyze th…
Probing astrophysical environment with eccentric extreme mass-ratio inspirals
Mostafizur Rahman, Shailesh Kumar, Arpan Bhattacharyya
The discovery of gravitational waves and black holes has started a new era of gravitational wave astronomy that allows us to probe the underpinning features of gravity and astrophy…
Gravitational Radiation from hyperbolic encounters in the presence of dark matter
Abhishek Chowdhuri, Rishabh Kumar Singh, Kaushik Kangsabanik +1
In this study, we look into binaries undergoing gravitational radiation during a hyperbolic passage. Such hyperbolic events can be a credible source of gravitational waves in futur…
Operator growth and Krylov Complexity in Bose-Hubbard Model
Arpan Bhattacharyya, Debodirna Ghosh, Poulami Nandi
We study Krylov complexity of a one-dimensional Bosonic system, the celebrated Bose-Hubbard Model. The Bose-Hubbard Hamiltonian consists of interacting bosons on a lattice, describ…
Quantum state complexity meets many-body scars
Sourav Nandy, Bhaskar Mukherjee, Arpan Bhattacharyya +1
Scar eigenstates in a many-body system refers to a small subset of non-thermal finite energy density eigenstates embedded into an otherwise thermal spectrum. This novel non-thermal…
Worldline effective field theory of inspiralling black hole binaries in presence of dark photon and axionic dark matter
Arpan Bhattacharyya, Saptaswa Ghosh, Sounak Pal
We investigate the correction to the potential that gives rise to the bound orbits and radiation from non-spinning inspiralling binary black holes in a dark matter environment cons…
Holographic complexity of Jackiw-Teitelboim gravity from Karch-Randall braneworld
Aranya Bhattacharya, Arpan Bhattacharyya, Ayan K. Patra
Recently, it has been argued in [1] that Jackiw-Teitelboim (JT) gravity can be naturally realized in the Karch-Randall braneworld in dimensions. Using the `complexity=volum…
A review on analytical studies in Gravitational Lensing
Abhishek Chowdhuri, Saptaswa Ghosh, Arpan Bhattacharyya
In this study, we review some current studies on Gravitational Lensing for black holes, mainly in the context of general relativity. We mainly focus on the analytical studies relat…
Circuit Complexity for Carrollian Conformal (BMS) Field Theories
Arpan Bhattacharyya, Poulami Nandi
We systematically explore the construction of Nielsen's circuit complexity to a non-Lorentzian field theory keeping in mind its connection with flat holography. We consider a 2d bo…
Decoherence, Entanglement Negativity and Circuit Complexity for Open Quantum System
Arpan Bhattacharyya, Tanvir Hanif, S. Shajidul Haque +1
In this paper, we compare the saturation time scales for complexity, linear entropy and entanglement negativity for two open quantum systems. Our first model is a coupled harmonic…
Pseudo complexity of purification for free scalar field theories
Aranya Bhattacharya, Arpan Bhattacharyya, Sabyasachi Maulik
We compute the pseudo complexity of purification corresponding to the reduced transition matrices for free scalar field theories with an arbitrary dynamical exponent. We plot the b…
Bootstrapping the Kronig-Penney Model
Matthew J. Blacker, Arpan Bhattacharyya, Aritra Banerjee
Recently, bootstrap methods from conformal field theory have been adapted for studying the energy spectrum of various quantum mechanical systems. In this paper, we consider the app…
Disorder driven cluster glass state in a geometrically frustrated hexagonal perovskite
Shruti Chakravarty, Øystein Slagtern Fjellvåg, Arpan Bhattacharyya +2
We report the observation of cluster glass-like properties in a double perovskite ruthenate BaCoRuO through structural (neutron and synchrotron X-ray diffraction), magnetic…
From CFTs to theories with Bondi-Metzner-Sachs symmetries: Complexity and out-of-time-ordered correlators
Aritra Banerjee, Arpan Bhattacharyya, Priya Drashni +1
We probe the contraction from relativistic CFTs to theories with Bondi-Metzner-Sachs (BMS) symmetries, or equivalently Conformal Carroll symmetries, using diagnostics of quant…
Study of eccentric binaries in Horndeski theory
Abhishek Chowdhuri, Arpan Bhattacharyya
We study the orbital evolution of eccentric binary systems in Horndeski gravity. This particular theory provides a testbed to give insightful comparisons with data. We compute the…
Complexity of warped conformal field theory
Arpan Bhattacharyya, Gaurav Katoch, Shubho R. Roy
Warped conformal field theories in two dimensions are exotic nonlocal, Lorentz violating field theories characterized by Virasoro-Kac-Moody symmetries and have attracted a lot of a…
Bath deformations, islands and holographic complexity
Aranya Bhattacharya, Arpan Bhattacharyya, Pratik Nandy +1
Considering a doubly holographic model, we study the evolution of holographic subregion complexity corresponding to deformations of bath state by a relevant scalar operator, which…
Complexity for Open Quantum System
Arpan Bhattacharyya, Tanvir Hanif, S. Shajidul Haque +1
We study the complexity for an open quantum system. Our system is a harmonic oscillator coupled to a one-dimensional massless scalar field, which acts as the bath. Specifically, we…