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471 papers · 1 filter
Detection of X-ray pulsations at the lowest observed luminosity of Be/X-ray binary pulsar EXO 2030+375 with AstroSat
Gaurava K. Jaisawal, Sachindra Naik, Shivangi Gupta +4
We present the results obtained from timing and spectral studies of Be/X-ray binary pulsar EXO 2030+375 using observations with the Large Area Xenon Proportional Counters and Soft…
Quantum Dynamics under continuous projective measurements: non-Hermitian description and the continuous space limit
Varun Dubey, Cedric Bernardin, Abhishek Dhar
The problem of the time of arrival of a quantum system in a specified state is considered in the framework of the repeated measurement protocol and in particular the limit of conti…
Origin of destruction of multiferroicity in Tb2BaNiO5 by Sr doping and its implications
Ram Kumar, S. Rajput, T. Maitra +6
The orthorhombic Haldane spin chain compound Tb2BaNiO5 (Neel order, TN1= 63 K) has been shown to be an exotic multiferroic system below (TN2) 25 K due to various fascinating featur…
Ultraviolet Imaging Telescope (UVIT) observation of the Galactic Globular Cluster NGC 7492
Ranjan Kumar, Ananta C. Pradhan, Abhisek Mohapatra +4
We present detailed photometric observations of the Galactic globular cluster NGC 7492 using the data obtained with two far-ultraviolet (FUV: 1300 - 1800 Å) and three near-ultravio…
Performance of the UVIT Level-2 Pipeline
S. K. Ghosh, S. N. Tandon, P. Joseph +3
Performance of the Level-2 pipeline, which translates the UVIT data created by the ISRO's ground segment processing systems (Level-1) into astronomer ready scientific data products…
In orbit performance of UVIT over the 5 years
S. K. Ghosh, P. Joseph, A. Kumar +21
Over the last 5 years, UVIT has completed observations of more than 500 proposals with ~ 800 unique pointings. In addition, regular planned monitoring observations have been made a…
Superconductivity in amorphous RexZr (x ~ 6) thin films
Surajit Dutta, Vivas Bagwe, Gorakhnath Chaurasiya +4
We report the growth, characterization and superconducting properties of a new amorphous superconductor, RexZr ( x ~ 6 ), in thin film form. Films were grown by pulsed laser deposi…
New Temperature and Metallicity Scale of Cool Giants from K-band Spectra
Supriyo Ghosh, D. K. Ojha, J. P. Ninan
We present here quantitative diagnostic tools for cool giants that employ low-resolution near-infrared spectroscopy in the -band for stellar population studies. In this study, a…
Planetary Nebulae with UVIT: A Progress Report
N. Kameswara Rao, Sutaria F., Murthy J. +2
The spectral region between 1250 Angstroms - 3000 Angstroms contains important spectral lines to understand the morphological structures and evolution of planetary nebulae. This is…
Broadband Modelling of Orphan Gamma Ray Flares
S. R. Patel, D. Bose, N. Gupta +1
Blazars, a class of highly variable active galactic nuclei, sometimes exhibit Orphan -ray flares. These flares having high flux only in -ray energies do not show significant…
Study of Galactic Structure Using UVIT/AstroSat Star Counts
Ranjan Kumar, Ananta C. Pradhan, Devendra K. Ojha +3
The structure of our Galaxy has been studied from ultraviolet (UV) star counts obtained with the Ultra-Violet Imaging Telescope (UVIT) on board the {\em AstroSat} satellite, in Far…
Long-range connectivity in a superconducting quantum processor using a ring resonator
Sumeru Hazra, Anirban Bhattacharjee, Madhavi Chand +4
Qubit coherence and gate fidelity are typically considered the two most important metrics for characterizing a quantum processor. An equally important metric is inter-qubit connect…
UVIT study of UV bright stars in the globular cluster NGC 4147
Ranjan Kumar, Ananta C. Pradhan, Mudumba Parthasarathy +4
We present far ultraviolet (FUV) observations of globular cluster NGC 4147 using three FUV filters, BaF2 (F154W), Sapphire (F169M), and Silica (F172M) of Ultra-Violet Imaging Teles…
Double-peaked Lines, Dual VLBI Components, and Precessing Jets in J1328+2751
S. Nandi, A. Caproni, P. Kharb +2
In this work, we report a radio galaxy with precessing jets, double-peaked emission lines and the presence of two compact radio components with a projected separation of ~6 parsec…
Exceptional Dirac states in a non-centrosymmetric superconductor, BiPd
Arindam Pramanik, Ram Prakash Pandeya, D. V. Vyalikh +9
Quantum materials having Dirac fermions in conjunction with superconductivity is believed to be the candidate materials to realize exotic physics as well as advanced technology. An…
Evidence of non-trivial Berry phase and Kondo physics in SmBi
Anup Pradhan Sakhya, P. L. Paulose, A. Thamizhavel +1
Realization of semimetals with non-trivial topologies such as Dirac and Weyl semimetals, have provided a boost in the study of these quantum materials. Presence of electron correla…
Accessing tens-to-hundreds femtoseconds nuclear state lifetimes with low-energy binary heavy-ion reactions
M. Ciemala, S. Ziliani, F. C. L. Crespi +52
A novel Monte Carlo technique has been developed to determine lifetimes of excited states in the tens-to-hundreds femtoseconds range. The method is applied to low-energy heavy-ion…
The DAQ system of the 12,000 Channel CMS High Granularity Calorimeter Prototype
B. Acar, G. Adamov, C. Adloff +327
The CMS experiment at the CERN LHC will be upgraded to accommodate the 5-fold increase in the instantaneous luminosity expected at the High-Luminosity LHC (HL-LHC). Concomitant wit…
Nanophotonic structures with optical surface modes for tunable spin current generation
P. V. Shilina, D. O. Ignatyeva, P. O. Kapralov +9
Heat generated by spin currents in spintronics-based devices is typically much less than that generated by charge current flows in conventional electronic devices. However, the con…
An upper limit calculator (UL-CALC) for undetected extended sources with radio interferometers: radio halo upper limits
Lijo T. George, Ruta Kale, Yogesh Wadadekar
Radio halos are diffuse, extended sources of radio emission detected primarily in massive, merging galaxy clusters. In smaller and/or relaxed clusters, where no halos are detected,…
Irrelevant Deformations of Chiral Bosons
Subhroneel Chakrabarti, Divyanshu Gupta, Arkajyoti Manna +1
We study deformations of chiral bosons using the formalism due to Sen. For arbitrary numbers of left- and right-chiral bosons, we find that the $ \t…
Observations of bright stars with AstroSat Soft X-ray Telescope
K. P. Singh, G. Stewart, S. Chandra +5
We present observations of four bright stars observed with the AstroSat Soft X-ray Telescope (SXT). Visible light from bright stars like these can leak through the very thin filter…
Decoding Multivariate Multiplicity Codes on Product Sets
Siddharth Bhandari, Prahladh Harsha, Mrinal Kumar +1
The multiplicity Schwartz-Zippel lemma bounds the total multiplicity of zeroes of a multivariate polynomial on a product set. This lemma motivates the multiplicity codes of Koppart…
Fun with colours: the standard model with two colour QCD has radically different long distance physics
Saumen Datta, Sourendu Gupta, Rishi Sharma
In our world the standard model of particle physics contains within it the fairly intractable theory called QCD. A toy version with two colours is often studied as a model confinin…