Faculty at School of Natural Sciences

Bhaskar Biswas

Bhaskar Biswas

Assistant Professor

School of Natural Sciences


Contact Information

Dr. Bhaskar Biswas is an Assistant Professor in the Department of Physics at Shiv Nadar Institution of Eminence. His research focuses on gravitational-wave astronomy, neutron-star astrophysics, multimessenger astronomy, numerical relativity, Bayesian inference, and neural-network and machine-learning applications in astrophysics.

  • Neutron-star astrophysics and the dense-matter equation of state
  • Gravitational-wave and multimessenger astronomy
  • Binary neutron-star mergers and numerical relativity
  • Tests of general relativity and alternative theories of gravity using compact objects
  • Cosmology with gravitational waves, including inference of the Hubble constant
  • Neutron-star population modelling and hierarchical Bayesian inference
  • Dark-matter-admixed neutron stars and exotic compact objects
  • Bayesian statistics, scienti`ic machine learning, and astrophysical data analysis

  • Ph.D. in Astrophysics, IUCAA, Pune, India (2016–2021).
    Thesis: "Constraining the equation of state of neutron stars using multimessenger observations."
    Supervisor: Prof. Sukanta Bose.
  • M.Sc. in Physics, Presidency University, Kolkata, India (2014–2016).
  • B.Sc. in Physics, Presidency University, Kolkata, India (2011–2014).

  • Assistant Professor, Department of Physics, Shiv Nadar Institution of Eminence, Delhi NCR, India (August 2026–Present).
  • Humboldt Research Fellow, Hamburg Observatory, University of Hamburg, Germany (March 2025–July 2026).
  • Postdoctoral Researcher, Hamburg Observatory, University of Hamburg, Germany (March 2023–February 2025).
  • Postdoctoral Researcher, Oskar Klein Centre, Stockholm University, Sweden (October 2021–February 2023).

  • Humboldt Postdoctoral Fellowship; Host Institute: Hamburg Observatory, University of Hamburg; Host Scientist: Prof. Stephan Rosswog.
  • Seal of Excellence, Marie Skłodowska-Curie Actions 2023 Individual Fellowships (awarded in 2024).
  • IOP Publishing Top Cited Paper Award for India for the article “Impact of PREX-II and Combined Radio/NICER/XMM-Newton’s Mass–radius Measurement of PSR J0740+6620 on the Dense-matter Equation of State.”
  • AHEAD-2020 A05 Travel Grant (€2,000), research visit to Aristotle University of Thessaloniki, Greece (2023).
  • AHEAD-2020 A03 Travel Grant (€2,000), research visit to Aristotle University of Thessaloniki, Greece (2022).
  • Honourable Mention, 2021 GWIC–Braccini Thesis
  • JEST All India Rank 10 (2016).
  • JEST All India Rank 20 (2015).
  • CSIR–UGC Junior Research Fellowship through the National Eligibility Test (2015).
  • INSPIRE Fellowship, Ministry of Science and Technology, Government of India (2010–2015).

  • Author or co-author of 56 research publications, including papers from the LIGO–Virgo–KAGRA
  • More than 13,000 citations and an h-index of
  • 17 publications outside the LIGO–Virgo–KAGRA Collaboration, including 12 `irst-author and 3 single-author papers.
  • Invited speaker at universities and research institutions in India, Germany, Greece, Sweden, and the United States.
  • Referee for Nature, Physical Review, The Astrophysical Journal Letters, and MDPI

  • Member, LIGO Scienti`ic Collaboration (2018–2021).

Select Publications

  1. B. Biswas, S. Rosswog, P. Diener, and L. Schnabel, "Binary neutron star mergers with SPHINCS_BSSN: temperature-dependent equations of state and damping of constraint violations," arXiv preprint, 2026.
  2. B. Biswas, "Equation of State Extrapolation Systematics: Parametric vs. Nonparametric Inference of Neutron Star Structure," Physical Review D, 2026.
  3. B. Biswas and P. Char, "Systematics from NICER pulse profiles drive uncertainty in multimessenger inference of the neutron star equation of state," Physical Review D, 2025.
  4. B. Biswas and S. Rosswog, "Simultaneously constraining the neutron star equation of state and mass distribution through multimessenger observations and nuclear benchmarks," Physical Review D, 2025.
  5. T. Ghosh, B. Biswas, S. Bose, and S. J. Kapadia, "Joint Inference of Population, Cosmology, and Neutron Star Equation of State from Gravitational Waves of Dark Binary Neutron Stars," The Astrophysical Journal Supplement Series, 2025.
  6. Z. Wu, B. Biswas, and S. Rosswog, "PSR J0952-0607: Probing the Stiffest Equations of State and r-Mode Suppression Mechanisms," arXiv preprint, 2025.
  7. B. Biswas, E. Smyrniotis, I. Liodis, and N. Stergioulas, "Bayesian investigation of the neutron star equation of state vs gravity degeneracy," Physical Review D, 2024.
  8. P. Char and B. Biswas, "The compact object of HESS J1731-347 and its implication on neutron star matter," Physical Review D, 2026.
  9. P. Tiwari, D. Zhou, B. Biswas, M. M. Forbes, and S. Bose, "Framework for Multi-messenger Inference from Neutron Stars: Combining Nuclear Theory Priors," arXiv preprint, 2023.
  10. B. Biswas, "Bayesian Model Selection of Neutron Star Equations of State Using Multi-messenger Observations," The Astrophysical Journal, 2022.
  11. B. Biswas and S. Datta, "Constraining neutron star properties with a new equation of state insensitive approach," Physical Review D, 2022.
  12. T. Ghosh, B. Biswas, and S. Bose, "Simultaneous inference of neutron star equation of state and the Hubble constant with a population of merging neutron stars," Physical Review D, 2022.
  13. B. Biswas, "Impact of PREX-II and Combined Radio/NICER/XMM-Newton’s Mass–radius Measurement of PSR J0740+6620 on the Dense-matter Equation of State," The Astrophysical Journal, 2021.
  14. B. Biswas, P. Char, R. Nandi, and S. Bose, "Towards mitigation of apparent tension between nuclear physics and astrophysical observations by improved modeling of neutron star matter," Physical Review D, 2021.
  15. B. Biswas, R. Nandi, P. Char, S. Bose, and N. Stergioulas, "GW190814: on the properties of the secondary component of the binary," Monthly Notices of the Royal Astronomical Society, 2021.
  16. B. Biswas and S. Bose, "Tidal deformability of an anisotropic compact star: Implications of GW170817," Physical Review D, 2019.
  17. B. Biswas, R. Nandi, P. Char, and S. Bose, "Role of crustal physics in the tidal deformation of a neutron star," Physical Review D, 2019.

Journals

  • Physical Review D
  • The Astrophysical Journal
  • The Astrophysical Journal Supplement Series
  • Monthly Notices of the Royal Astronomical Society (MNRAS)

  • October 2020: “Constraining Neutron star equation of state using existing and upcoming astrophysical observations,” Presidency University, Kolkata, India (online).
  • October 2020: “Constraining Neutron star equation of state using existing and upcoming astrophysical observations,” Nuclear Theory Group, India (online).
  • July 2022: “Constraining the equation of state of neutron stars using multimessenger observations,” Aristotle University of Thessaloniki, Greece.
  • October 2022: “Constraining the neutron star equation of state and the Hubble constant using existing and upcoming astrophysical observations,” Hamburg Observatory, Germany.
  • January 2023: “Constraining the neutron star equation of state and the Hubble constant using existing and upcoming astrophysical observations,” IUCAA, Pune, India.
  • July 2023: “Probing nuclear physics and cosmology with neutron stars,” Online workshop, NIT Rourkella, India.
  • September 2024: “Measuring nuclear physics and the expansion rate of the universe with neutron stars,” Washington State University, Pullman, USA.
  • October 2024: “Probing the Dense Matter Equation of State: Neutron Stars in General Relativity and Beyond,” IUCAA, Pune, India.
  • May 2025: “One Framework to Rule Them All: EoS, Populations, H0, and Gravity from Multimessenger Data,” Oskar Klein Centre, Stockholm, Sweden.

  • B. Biswas, "LIGO-Virgo finds an enigmatic object in the mass gap," Gravity Matters – LIGO-India Blog, 2020.

  • Humboldt Postdoctoral Fellowship, Hamburg Observatory, University of Hamburg (2025–2026); Host Scientist: Prof. Stephan Rosswog.
  • AHEAD-2020 A03 Travel Grant (€2,000), research visit to Aristotle University of Thessaloniki, Greece (2022).
  • AHEAD-2020 A05 Travel Grant (€2,000), research visit to Aristotle University of Thessaloniki, Greece (2023).

Conference Presentations

  • January 2019: "Accounting for realistic effects in tidal deformation of Neutron star," 30th Meeting of the Indian Association for General Relativity and Gravitation (IAGRG), BITS Pilani, Hyderabad, India.
  • July 2019: "Tidal deformability of an anisotropic compact star: Implications for GW170817," 22nd International Conference on General Relativity and Gravitation (GR22 and AMALDI13), Valencia.
  • January 2020: "Accounting realistic effects in tidal deformation of Neutron stars," Advances in Astroparticle Physics and Cosmology (AAPCOS-2020), Saha Institute of Nuclear Physics, Kolkata, India.
  • February 2021: "GW190814: On the properties of the secondary component of the binary," Astronomical Society of India (Online).
  • March 2021: "GW190814: On the properties of the secondary component of the binary," Meeting of the National Research Group on Gravitational Waves, Institut Henri Poincaré (Online).
  • July 2021: "Constraining the equation of state of neutron stars using multimessenger observations," Edoardo Amaldi Conference on Gravitational Waves (Online).
  • July 2022: "Constraining the equation of state of neutron stars using multimessenger observations," 23rd International Conference on General Relativity and Gravitation (GR23, Online).
  • April 2023: "Exploring fundamental physics with neutron stars," Quantum Universe Day, DESY Campus, Germany.
  • June 2023: "Constraining the equation of state of neutron stars using multi-messenger observations," GWsNS Summer School, Aussois-Modane, France.
  • July 2023: "Constraining neutron star properties with a new equation of state insensitive approach," Amaldi15 (Online).
  • September 2023: "Multimessenger inference of neutron star equation of state and gravity," MICRA Conference, Trento, Italy.
  • October 2023: "Multimessenger investigation on the neutron star equation-of-state-gravity degeneracy," OKC@15 Workshop, Stockholm, Sweden.
  • February 2024: "Multimessenger inference of neutron star equation of state and gravity," GWPFP Workshop, Rome, Italy.
  • August 2024: "Simultaneously Constraining the Neutron Star Equation of State and Mass Distribution through Multimessenger Observations and Nuclear Benchmarks," INT Workshop, Seattle, USA.
  • October 2024: "Constraining the Neutron Star Equation of State through Multimessenger Observations and Nuclear Data," NEOSGrav2024 Conference, Goa, India.
  • May 2025: "Combined nuclear physics and multimessenger inference of neutron star equation of state," 2nd Workshop on Modern Equations of State and Spectroscopy in Neutron-Star Matter, Madrid, Spain.
  • September 2025: "Inference of Neutron Star Equation of State: Where We Stand in 2025," Rattle and Shine: Gravitational Waves and More, Hamburg, Germany.
  • November 2025: "Post-Merger Gravitational Waves as Probes of the Finite-Temperature Neutron Star Equation of State," Quantum Universe Day, Hamburg, Germany.
  • November 2025: "Understanding the Neutron Star Equation of State: From Cold Observables to Hot Merger Dynamics," IISc, Bangalore, India.
  • November 2025: "Neutron Star Matter Under Extreme Conditions: Insights from Observations and Numerical Simulations," RRI, Bangalore, India.
  • May 2026: "Probing the Finite-Temperature Neutron Star Equation of State with Post-Merger Gravitational Waves," Compact Stars in the QCD Phase Diagram Conference, Barcelona, Spain.

  • December 2020: “GW190814: On the properties of the secondary component of the binary,” online poster, 31st Meeting of the Indian Association for General Relativity and Gravitation (IAGRG).

  • Teaching Assistant, IUCAA Graduate School, Statistical Mechanics (2017–2019).
  • Teaching Assistant, University of Hamburg, “Astrophysical Gasdynamics” taught by Stephan Rosswog (2025–2026).
  • Mentoring and research guidance for Tathagata Ghosh and Kexuan Wu (2021–Present).
  • Master’s thesis supervision of Zeyue Wu and Kaushikk Venkatesh Narayan at Hamburg Observatory (2024–Present).
  • Public outreach and organization of poster sessions for National Science Day at IUCAA, Pune (2016–2021).

  • Referee for Physical Review C, D, L, and X, The Astrophysical Journal Letters, Nature, and MDPI journals (2022–Present).

  • Member of the Local Organizing Committee, “Rattle and Shine: Gravitational Waves and More,” Hamburg Observatory (September 2025).