Ashadul Halder

Scopus Publications

Bridging the gap between virtual and physical laboratories: a web-based interactive platform for undergraduate physics practicals
Ashadul Halder, Shibaji Banerjee
Physics Education, 2026
The COVID-19 pandemic highlighted the challenges of maintaining hands-on laboratory instruction in undergraduate physics education. In response, we developed and deployed an interactive online physics laboratory platform designed to closely replicate the experimental setups available and curriculum of St. Xavier’s College (Autonomous), Kolkata. The platform is designed to closely replicate real experimental arrangements and is aligned with the curriculum, allowing students to prepare effectively before performing physical experiments. Student feedback revealed that 100% of the respondents rated the platform as beneficial (rating 4 or 5 on a 5-point scale) to improve conceptual understanding and increase confidence in conducting physical experiments. Furthermore, all students agreed that having access to the online prelab simulations is advantageous and recommended its regular use. These findings highlight the effectiveness of web-based simulations as a complementary and sustainable resource for physics education.
Addressing the self-interaction for ELDER dark matter from the 21-cm signal
Rupa Basu, Debasish Majumdar, Ashadul Halder, Shibaji Banerjee
International Journal of Modern Physics A, 2025
The self-interacting dark matter can affect various cosmological processes. Such interactions can be number conserving (e.g. [Formula: see text]) or number violating (e.g. [Formula: see text]). The latter processes where three (or more) dark matter particles undergo self-annihilation/scattering to produce less number of dark matter is termed as Cannibalism process. In this work, the self-interaction of dark matter and the strength of such interactions are investigated in the light of experimental results of the global 21-cm spectrum of neutral hydrogen from the era of cosmic dawn. From the present work, it appears that [Formula: see text] process is much more dominant over the [Formula: see text] process. It is also found that such interactions affect the dark matter-baryon elastic scattering cross-section. The study also indicates the presence of multi-component dark matter of different mass ranges in the Universe.
Exploring the effects of dark matter–dark energy interaction on cosmic evolution in viscous dark energy scenario
Ashadul Halder, Madhurima Pandey, Rupa Basu, Debasish Majumdar
European Physical Journal Plus, 2025
Analyzing the 21-cm Signal Brightness Temperature in the Universe with Inhomogeneities
Shashank Shekhar Pandey, Ashadul Halder, Archan S. Majumdar
Springer Proceedings in Physics, 2025
Exploring the Effects of Dark Matter-Dark Energy Interaction on Cosmic Evolution in Viscous Dark Energy Scenario
Madhurima Pandey, Ashadul Halder, Debasish Majumdar, Rupa Basu
Springer Proceedings in Physics, 2025
Analyzing the 21-cm signal brightness temperature in the Universe with inhomogeneities
Shashank Shekhar Pandey, Ashadul Halder, A. S. Majumdar
Physical Review D, 2024
We explore the 21-cm signal in our Universe containing inhomogeneous matter distribution at considerably large scales. Employing Buchert's averaging procedure in the context of a model of spacetime with multiple inhomogeneous domains, we evaluate the effect of our model parameters on the observable 21-cm signal brightness temperature. Our model parameters are constrained through the Markov Chain Monte Carlo method using the Union 2.1 supernova Ia observational data. We find that a significant dip in the brightness temperature compared to the $\\Lambda$CDM prediction could arise as an effect of the inhomogeneities present in the Universe.
Detecting Solar Dark Matter Neutrinos at KM3NeT from Dark Matter Annihilations at the Solar Core
Aman Gupta, Debasish Majumdar, Ashadul Halder
Springer Proceedings in Physics, 2024
Future deceleration due to backreaction in a Universe with multiple inhomogeneous domains
Ashadul Halder, Shashank Shekhar Pandey, A.S. Majumdar
Journal of Cosmology and Astroparticle Physics, 2023
We formulate a model of spacetime with inhomogeneous matter distribution in multiple domains. In the context of the backreaction framework using Buchert's averaging procedure, we evaluate the effect of backreaction due to the inhomogeneities on the late time global evolution of the Universe. Examining the future evolution of this universe, we find that it can transit from the presently accelerating phase to undergo future deceleration. The future deceleration is governed by our model parameters. We constrain the model parameters using observational analysis of the Union 2.1 supernova Ia data employing the Markov Chain Monte Carlo method.
Erratum to: Late time cosmology in f(R, G) gravity with exponential interactions (The European Physical Journal C, (2023), 83, 1, (23), 10.1140/epjc/s10052-022-11116-z)
A. Chanda, A. Halder, A. S. Majumdar, B. C. Paul
European Physical Journal C, 2023
KM3NeT upper bounds of detection rates of solar neutrinos from annihilations of dark matter at the solar core
Aman Gupta, Debasish Majumdar, Ashadul Halder
Modern Physics Letters A, 2022
The Weakly Interacting Massive Particles (WIMPs) so far remain one of the most popular candidates for dark matter. If captured gravitationally inside the core of the Sun, these WIMPs may produce high-energy neutrinos as the end product in case they undergo self-annihilations at the solar core. In this work, we address the detectability of such neutrinos at the proposed KM3NeT detector. Upper bounds of the detection rate for such neutrinos at KM3NeT are computed for the case of a generic dark matter scenario and also when specific models for particle dark matter are chosen. In this work, upper bounds of muon event rates for different annihilating dark matter masses are computed for each of the cases of dark matter annihilation channels (e.g. [Formula: see text], [Formula: see text], [Formula: see text], etc.). These upper bounds are also computed by considering the dark matter scattering cross-section using upper bounds obtained from PandaX-4T direct dark matter search experiment.
Global 21-cm brightness temperature in viscous dark energy models
Ashadul Halder, Shashank Shekhar Pandey, A.S. Majumdar
Journal of Cosmology and Astroparticle Physics, 2022
Constraining PBH mass distributions from 21cm brightness temperature results and an analytical mapping between probability distribution of 21cm signal and PBH masses
Upala Mukhopadhyay, Debasish Majumdar, Ashadul Halder
Journal of Cosmology and Astroparticle Physics, 2022
Probing the effects of primordial black holes on 21-cm EDGES signal along with interacting dark energy and dark matter-baryon scattering
Ashadul Halder, Madhurima Pandey
Monthly Notices of the Royal Astronomical Society, 2021
The violation of equivalence principle and four neutrino oscillations for long baseline neutrinos
Madhurima Pandey, Debasish Majumdar, Amit Dutta Banik, Ashadul Halder
Modern Physics Letters A, 2021
Exploring multimessenger signals from heavy dark matter decay with EDGES 21-cm result and IceCube
Ashadul Halder, Madhurima Pandey, Debasish Majumdar, Rupa Basu
Journal of Cosmology and Astroparticle Physics, 2021
Estimation of baryon asymmetry from dark matter decaying into IceCube neutrinos
Tista Mukherjee, Madhurima Pandey, Debasish Majumdar, Ashadul Halder
International Journal of Modern Physics A, 2021
Bounds on abundance of primordial black hole and dark matter from EDGES 21-cm signal
Ashadul Halder, Shibaji Banerjee
Physical Review D, 2021
Chandrasekhar limit for rotating quark stars
Ashadul Halder, Shibaji Banerjee, Sanjay K. Ghosh, Sibaji Raha
Physical Review C, 2021
Addressing γ-ray emissions from dark matter annihilations in 45 Milky Way satellite galaxies and in extragalactic sources with particle dark matter models
Ashadul Halder, Shibaji Banerjee, Madhurima Pandey, Debasish Majumdar
Monthly Notices of the Royal Astronomical Society, 2021
Mass and life time of heavy dark matter decay into icecube pev neutrinos
Madhurima Pandey, Debasish Majumdar, Ashadul Halder, Shibaji Banerjee
Springer Proceedings in Physics, 2020
Mass and life time of heavy dark matter decaying into IceCube PeV neutrinos
Madhurima Pandey, Debasish Majumdar, Ashadul Halder, Shibaji Banerjee
Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 2019

Ashadul Halder

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Scopus Publications