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8,802 papers
Spectral-Timing Evolution of the Black Hole X-ray Binary LMC X-3: An XPoSat View
Sayantan Bhattacharya, Aman Kaushik, Sudip Bhattacharyya
LMC X-3 is a persistent black hole high-mass X-ray binary and serves as an important laboratory for studying accretion disk evolution across different spectral states. We present a…
Compression-controlled dynamic buckling in thin soft sheets
Harsh Jain, Shankar Ghosh, Kirti Chandra Sahu
We investigate experimentally the dynamic phase transition from compressed to buckled phases for thin sheets of rubber. We find that the rubber strips enter a highly compressed, me…
Finding the evolutionary link between ULIRGs and radio galaxies
Ayisha Fida, Sumana Nandi, Mousumi Das +4
Ultraluminous infrared galaxies (ULIRGs) are the remnants of the major mergers of gas-rich galaxies. They are dusty systems and are extremely luminous in the infrared. Both starbur…
Transmutation Timescales for Dark Matter Induced Collapse of Compact Stars into Black Holes
H. A. Adarsha, Chandrachur Chakraborty, Sudip Bhattacharyya
Ultra-heavy asymmetric dark matter (DM) particles captured by compact stars can thermalize, self-gravitate, and collapse to form an endoparasitic black hole (EBH), whose subsequent…
Authentication over Arbitrarily Varying Channels with Causal Adversaries
Mayank Bakshi, Vinod M. Prabhakaran, Bikash Kumar Dey +1
We study authentication over a discrete memoryless arbitrarily varying channel (AVC) in which the adversary selects the channel state causally based on past channel outputs. We pro…
Filaments within filaments: unraveling the hierarchy of the cosmic web
Saee Dhawalikar, Aseem Paranjape, Shadab Alam
Cosmic filaments are the most striking feature of the hierarchical cosmic web. Yet, their own sub-structure remains unexplored, unlike the well-known, universal halo/sub-halo hiera…
Tilted thin accretion disks in the full Kerr spacetime and their implications
K. S. Sruthy, Chandrachur Chakraborty, Sudip Bhattacharyya
We derive a steady-state warped-disk equation in the full Kerr spacetime to study the tilt dynamics of a thin, viscous accretion disk around a spinning collapsed object. The formul…
A Quiet Host in an Active Planet-Forming Disk: Optical Spectroscopy of WISPIT 2
C. Swastik, M. Bestha, L. S. Sonith +11
WISPIT 2 is a young pre-main-sequence star hosting a multi-ringed transition disk and two directly imaged protoplanets, including the accreting WISPIT 2b, making it the closest kno…
Enhancing the Cherenkov Telescope Array Observatory high-level performance through an event-type-based analysis
Juan Bernete, Silvia García-Soto, Tarek Hassan +4
The analysis traditionally employed by Imaging Atmospheric Cherenkov Telescopes involves optimizing quality cuts to select a sub-sample of high-quality events. These events are use…
The SPOTLIGHT Pulsar Search Pipeline: A GPU-Accelerated FFT Approach
Jyotirmoy Das, Jayanta Roy, Nishant Pradeep Deo +20
We present the pulsar search component of SPOTLIGHT (Survey for sPoradic radiO bursTs via a commensaL multI-beam Gpu-powered Hpc at the gmrT), a GPU-accelerated commensal backend o…
The Deep Learning Cosmic Ray Energy Reconstruction Pipeline for the GRAPES-3 Experiment
Sambit Sarkar, Mansi Talwar, Pravata K. Mohanty
The mass independent energy reconstruction of cosmic rays is crucial for understanding their origin, acceleration, and propagation. Precise measurement of the primary energy can al…
Machine learning pipeline for identifying tracks of muons and hadrons at GRAPES-3 muon telescope
Mansi Talwar, Sambit Sarkar, Pravata K. Mohanty
The GRAPES-3 experiment is a ground-based extensive air shower array which consists of approximately closely packed plastic scintillator detectors and a large area muon teles…
The Variability of Radio Stars
Laura N. Driessen, Alex Andersson, Joseph R. Callingham +6
Stellar radio emission is highly variable with stellar flares lasting from milliseconds to hours. For some stars, their flares or bursts can repeat once every couple of hours, whil…
Radio emission from ultra-diffuse galaxies residing in galaxy clusters
Dharam V. Lal, Jeyasiona Murugesh
Ultra-diffuse galaxies (UDGs), defined by their extremely low surface brightness (-band mag arcsec) and large effective radii (3--10 arcsec), remain one of…
Superconducting cavity probes sliding ferroelectricity in small-angle twisted WSe
Krishnendu Maji, Supriya Mandal, Sriram H. +8
Ferroelectricity is a property of materials that exhibit spontaneous charge polarization. Ferroelectricity in 2D materials is interesting because of their applications in memory de…
Star Formation at the Periphery of a Molecular Superbubble: The Case of G12.79+0.43
Arun Seshadri, Veena V. S., Sarita Vig +1
We present a multiwavelength investigation of the molecular cloud complex G12.79+0.43, which extends over on the sky. Several infrared- and radio-bright regions are arran…
Tunable Chaos in the Finite Mean SYK Model
Arkaprava Mukherjee, Sumilan Banerjee, Sandip P. Trivedi +1
The complex Sachdev-Ye-Kitaev (SYK) model, featuring fermions with all-to-all interactions, serves as a dual paradigm for understanding non-Fermi liquid behavior and the holographi…
Summary of the First Year of the Space Weather Around Young Suns Program: 900 Hours of Low-frequency Radio and Optical Data Dedicated to Young, Solar-type Stars
Ivey Davis, Gregg Hallinan, Nikita Kosogorov +51
The Space Weather Around Young Suns (SWAYS) program was introduced in \citet{Davis2025} as a multi-wavelength monitoring program for studying the activity and particle environments…
Pantheon+ supernovae corrected for progenitor age indicate the universe is decelerating
Animesh Sah, Mohamed Rameez, Subir Sarkar
We examine the impact of progenitor age-dependent luminosity evolution of Type Ia supernovae on a cosmographic measurement of the deceleration parameter . Our recent redshift…
Constraining Orbital Eccentricity of a Supermassive Black Hole Binary Candidate PKS 2131-0211
Avinash Kumar Paladi, A. Gopakumar, Sushmita Agarwal +1
A detailed analysis of the decades-long radio light curve of blazar PKS 2131-021 showed epochs of sinusoidal variations in the radio flux density time-series as detailed in O'Neill…
uGMRT and MeerKAT observation of RXCJ0232-4420: a quiet cluster with a giant radio halo
Pralay Biswas, Ramananda Santra, Ruta Kale +1
Giant radio halos are the Mpc-scale extended sources associated with the merging clusters, while the mini-halos are preferentially associated with cool-core clusters. Both trace th…
Phase diagram of the vortex state in an amorphous Re6Zr thin film exhibiting inverse melting
Pritam Das, Subhamita Sengupta, Anjan Jana +6
In Type II superconductors, the vortex lattice can exhibit "inverse melting," transitioning from a liquid to a crystalline solid as temperature increases. While recently observed v…
A NICER and AstroSat view of the neutron star low-mass X-ray binary 1A 1246-588
Vaidehi Poojyam, Vikas Mistry, Yash Bhargava +2
Neutron star (NS) low-mass X-ray binary (LMXB) systems depict a variety of X-ray spectral and timing features, which can be useful to probe the accretion-ejection mechanism in the…
GW240925 and GW250207: Astrophysical Calibration of Gravitational-wave Detectors
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1839
GW240925 and GW250207 are two loud gravitational-wave signals from binary black hole coalescences observed with network signal-to-noise ratios and , respectively…