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Department of Physics: Recent submissions

  • Cosmoglobe DR1 results II. Constraints on isotropic cosmic birefringence from reprocessed WMAP and Planck LFI data 
    Eskilt, J.R.; Watts, D.J.; Aurlien, R.; Basyrov, A; Patel, S.K.; Sanyal, S.; Verma, A. (EDP Sciences, 2023-11-01)
    Cosmic birefringence is a parity-violating effect that might have rotated the plane of the linearly polarized light of the cosmic microwave background (CMB) by an angle β since its emission. This angle has recently been ...
  • Randomness assisted in-line holography with deep learning 
    Manisha; Mandal, Aditya Chandra; Rathor, Mohit; Zalevsky, Zeev; Singh, Rakesh Kumar (Nature Research, 2023-12)
    We propose and demonstrate a holographic imaging scheme exploiting random illuminations for recording hologram and then applying numerical reconstruction and twin image removal. We use an in-line holographic geometry to ...
  • Large-scale turbulence cascade in the spiral galaxy NGC 6946 
    Nandakumar, Meera; Dutta, Prasun (Oxford University Press, 2023-10-05)
    The generation mechanism of compressible fluid turbulence at kiloparsec scales in the interstellar medium is a long-lasting puzzle. In this work, we explore the nature of large-scale turbulence in the external spiral galaxy ...
  • Exploring the reliability of polar field rise rate as a precursor for an early prediction of solar cycle 
    Biswas, Akash; Karak, Bidya Binay; Kumar, Pawan (Oxford University Press, 2023-09-28)
    The prediction of the strength of an upcoming solar cycle has been a long-standing challenge in the field of solar physics. The inherent stochastic nature of the underlying solar dynamo makes the strength of the solar cycle ...
  • Flavonic dark matter 
    Abbas, Gauhar; Adhikari, Rathin; Chun, Eung Jin (American Physical Society, 2023-12-27)
    We show for the first time that a common solution to dark matter and the flavor problem of the standard model can be obtained in the framework of the ZN×ZM flavor symmetry where the flavonic Goldstone boson of this flavor ...
  • Towards 21-cm intensity mapping at z = 2.28 with uGMRT using the tapered gridded estimator - III. Foreground removal 
    Elahi, Kh Md Asif; Bharadwaj, Somnath; Pal, Srijita; Ghosh, Abhik; Ali, Sk Saiyad; Choudhuri, Samir; Chakraborty, Arnab; Datta, Abhirup; Roy, Nirupam; Choudhury, Madhurima; Dutta, Prasun (Oxford University Press, 2023-11-01)
    Neutral hydrogen () 21-cm intensity mapping (IM) is a promising probe of the large-scale structures in the Universe. However, a few orders of magnitude brighter foregrounds obscure the IM signal. Here, we use the tapered ...
  • Did Kepler-444 have a long-lived convective core? 
    Winther, Mark Lykke; Aguirre Børsen-Koch, Víctor; Rørsted, Jakob Lysgaard; Stokholm, Amalie; Verma, Kuldeep (Oxford University Press, 2023-10-01)
    With the greater power to infer the state of stellar interiors provided by asteroseismology, it has become possible to study the survival of initially convective cores within stars during their main-sequence evolution. ...
  • Probing the variations in the timing of the Sun's polar magnetic field reversals through observations and surface flux transport simulations 
    Golubeva, Elena M.; Biswas, Akash; Khlystova, Anna I.; Kumar, Pawan; Karak, Bidya Binay (Oxford University Press, 2023-10-01)
    The polar field reversal is a crucial process in the cyclic evolution of the large-scale magnetic field of the Sun. Various important characteristics of a solar cycle, such as its duration and strength, and also the cycle ...
  • COSMOGLOBE DR1 results: I. Improved Wilkinson Microwave Anisotropy Probe maps through Bayesian end-to-end analysis 
    Watts, D.J.; Basyrov, A.; Eskilt, J.R.; Galloway, M.; Gjerløw, E.; Hergt, L.T.; Herman, D.; Ihle, H.T.; Paradiso, S.; Rahman, F.; Thommesen, H.; Aurlien, R.; Bersanelli, M.; Bianchi, L.A.; Brilenkov, M.; Colombo, L.P.L.; Eriksen., H.K; Franceschet, C.; Fuskeland, U.; Hensley, B.; Hoerning, G.A.; Patel, S.K.; Verma, A. (EDP Sciences, 2023-11-01)
    We present COSMOGLOBE Data Release 1, which implements the first joint analysis of WMAP and Planck LFI time-ordered data, processed within a single Bayesian end-to-end framework. This framework directly builds on a similar ...
  • Metrewave Galactic Plane with the uGMRT (MeGaPluG) Survey: Lessons from the pilot study 
    Dokara, Rohit; Roy, Nirupam; Menten, Karl; Vig, Sarita; Dutta, Prasun; Beuther, Henrik; Pandian, Jagadheep D.; Rugel, Michael; Rashid, Md; Brunthaler, Andreas (EDP Sciences, 2023-10-01)
    Context. The advent of wide-band receiver systems on interferometer arrays has enabled the undertaking of high-sensitivity and highresolution radio continuum surveys of the Galactic plane in a reasonable amount of telescope ...
  • AutoTAB: Automatic Tracking Algorithm for Bipolar Magnetic Regions 
    Sreedevi, Anu; Jha, Bibhuti Kumar; Karak, Bidya Binay; Banerjee, Dipankar (American Astronomical Society, 2023-10-04)
    Bipolar magnetic regions (BMRs) provide crucial information about solar magnetism. They exhibit varying morphology and magnetic properties throughout their lifetime, and studying these properties can provide valuable ...
  • COSMOGLOBE: Towards end-to-end CMB cosmological parameter estimation without likelihood approximations 
    Eskilt, J.R.; Lee, K.; Watts, D.J.; Anshul, V.; Aurlien, R.; Basyrov, A.; Bersanelli, M.; Colombo, L.P.L.; Eriksen, H.K.; Fornazier, K.S.F.; Fuskeland, U.; Galloway, M. (EDP Sciences, 2023-10-01)
    We implement support for a cosmological parameter estimation algorithm in Commander and quantify its computational efficiency and cost. For a semi-realistic simulation similar to Planck LFI 70 GHz, we find that the ...
  • Quantum information diode based on a magnonic crystal 
    Shukla, Rohit K; Chotorlishvili, Levan; Vijayan, Vipin; Verma, Harshit; Ernst, Arthur; Parkin, Stuart S P; Mishra, Sunil K (Institute of Physics, 2023-08-01)
    Exploiting the effect of nonreciprocal magnons in a system with no inversion symmetry, we propose a concept of a quantum information diode (QID), i.e. a device rectifying the amount of quantum information transmitted in ...
  • Numerical Simulations of the Decaying Transverse Oscillations in the Cool Jet 
    Srivastava, Abhishek K.; Singh, Balveer (Multidisciplinary Digital Publishing Institute (MDPI), 2023-06-25)
    In the present paper, we describe a 2.5D (two-and-a-half-dimensional) magnetohydrodynamic (MHD) simulation that provides a detailed picture of the evolution of cool jets triggered by initial vertical velocity perturbations ...
  • Impact of crystal structure on optical properties and temperature sensing behavior of NaYF4:Yb3+/Er3+ nanoparticles 
    Dubey, Charu; Yadav, Anjana; Baloni, Diksha; Kachhap, Santosh; Singh, Sunil Kumar; Singh, Akhilesh Kumar (Royal Society of Chemistry, 2023-07-11)
    We report a comprehensive study of the structural, morphological, and optical properties, and UC-based ratiometric temperature sensing behavior of (α) cubic and (β) hexagonal phases of NaYF4:Yb3+/Er3+ nanoparticles. The ...
  • Al-doped ZnO based long range optical fibre sensor for efficient low refractive index detection 
    Kumar, Hemant; Kumar, Raj; Ramani, Umang; Singh, Bipin K.; Pandey, Praveen C. (Springer, 2023-05-14)
    In this article, a simulation of surface plasmon resonance (SPR) based Al-doped ZnO (AZO) coated long-range low refractive index detections in infrared range sensor by the finite element method is presented. Plasmonic ...
  • Transverse oscillations and an energy source in a strongly magnetized sunspot 
    Yuan, Ding; Fu, Libo; Cao, Wenda; Kuźma, Błażej; Geeraerts, Michaël; Trelles Arjona, Juan C.; Murawski, Kris; Van Doorsselaere, Tom; Srivastava, Abhishek K.; Miao, Yuhu; Feng, Song; Feng, Xueshang (Nature Research, 2023-05-25)
    The solar corona is two to three orders of magnitude hotter than the underlying photosphere, and the energy loss of coronal plasma is extremely strong, requiring a heating flux of over 1,000 W m −2 to maintain its high ...
  • Phase separation kinetics of block copolymer melts confined under moving parallel walls: A DPD study 
    Singh, Ashish Kumar; Singh, Awaneesh (Elsevier B.V., 2023-04-28)
    We use dissipative particle dynamics (DPD) simulations to study the effect of shear on domain morphology and kinetics of microphase separating critical diblock copolymer (BCP) bulk melts. The melt is confined within two ...
  • Investigations on tailoring physical properties of RF magnetron sputtered Cadmium Sulphide thin films 
    Trivedi, Harshita; Ghorannevis, Zohreh; Chaudhary, Shilpi; Parmar, Avanish S. (Elsevier B.V., 2023-02-02)
    The effect of nitrogen (N2) partial pressure on the structure and bandgap tunability of RF magnetron sputtered Cadmium Sulphide (CdS) thin films is investigated by varying N2 partial pressure in Ar/N2 mixture. In presence ...
  • Dynamo modelling for cycle variability and occurrence of grand minima in Sun-like stars: rotation rate dependence 
    Vashishth, Vindya; Karak, Bidya Binay; Kitchatinov, Leonid (Oxford University Press, 2023-06)
    Like the solar cycle, stellar activity cycles are also irregular. Observations reveal that rapidly rotating (young) Sun-like stars exhibit a high level of activity with no Maunder-like grand minima and rarely display smooth ...

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