Ish Gupta

I am an N3AS Postdoctoral Fellow at the University of California, Berkeley, and a Visiting Scholar at CIERA, Northwestern University.

I earned my PhD in Physics from Penn State in August 2025 under the supervision of Prof. B. Sathyaprakash. My research focuses on the science unlocked by neutron star-black hole mergers.

In my dissertation, I demonstrated the detectability of these sources, quantified how well their parameters can be measured, and highlighted their multi-messenger potential. I further showed that neutron star-black hole mergers can serve as powerful cosmic probes, enabling sub-percent measurements of the universe’s expansion rate.

I am a member of the LIGO–Virgo–KAGRA (LVK) Collaboration the Cosmic Explorer (CE) Consortium, and the Einstein Telescope (ET) Collaboration. In the LVK, I primarily contribute to the Tests of General Relativity subgroup, where I lead one analysis and contribute to two others. I have also worked within the Cosmology subgroup, building the case for host-galaxy identification of well-localized mergers through targeted follow-up. In addition, I have served on paper-writing teams for LVK publications during the fourth observing run.

As part of the CE Consortium, I led the technical study that developed the scientific case for CE, a next-generation network of gravitational-wave detectors proposed in the United States, with sensitivity more than ten times greater than current instruments. I am currently contributing to the Science Traceability Matrix study for CE and co-leading the Cosmology subgroup. For the ET Collaboration, I have contributed to science studies, with a particular focus on cosmology and multi-messenger science.

news

Sep 14, 2025	Looking for remote research interns 📢
Sep 02, 2025	Started as an N3AS Postdoctoral Fellow at UC Berkeley
Aug 16, 2025	Graduated with a PhD in Physics from Penn State 🏫

selected publications

arXiv

Testing general relativity with amplitudes of subdominant gravitational-wave modes

Ish Gupta, Purnima Narayan, Lionel London, and 2 more authors

Nov 2025

Bib

@article{Gupta:2025paz,
  author = {Gupta, Ish and Narayan, Purnima and London, Lionel and Tiwari, Shubhanshu and Sathyaprakash, Bangalore},
  title = {{Testing general relativity with amplitudes of subdominant gravitational-wave modes}},
  eprint = {2511.11886},
  archiveprefix = {arXiv},
  primaryclass = {gr-qc},
  month = nov,
  year = {2025},
}

PRD

Foreground signals minimally affect inference of high-mass binary black holes in next-generation gravitational-wave detectors

Ish Gupta, Koustav Chandra, and B. S. Sathyaprakash

Phys. Rev. D, May 2025

DOI Bib

@article{Gupta:2024lft,
  author = {Gupta, Ish and Chandra, Koustav and Sathyaprakash, B. S.},
  title = {{Foreground signals minimally affect inference of high-mass binary black holes in next-generation gravitational-wave detectors}},
  eprint = {2410.22302},
  archiveprefix = {arXiv},
  primaryclass = {gr-qc},
  doi = {10.1103/PhysRevD.111.104013},
  journal = {Phys. Rev. D},
  volume = {111},
  number = {10},
  pages = {104013},
  year = {2025},
  month = may,
}

ApJ

Inferring Small Neutron Star Spins with Neutron Star–Black Hole Mergers

Ish Gupta

Astrophys. J., Jul 2024

DOI Bib

@article{Gupta:2024bqn,
  author = {Gupta, Ish},
  title = {{Inferring Small Neutron Star Spins with Neutron Star{\textendash}Black Hole Mergers}},
  eprint = {2402.07075},
  archiveprefix = {arXiv},
  primaryclass = {astro-ph.HE},
  doi = {10.3847/1538-4357/ad49a0},
  journal = {Astrophys. J.},
  volume = {970},
  number = {1},
  pages = {12},
  year = {2024},
  month = jul,
}

CQG

Cosmography with next-generation gravitational wave detectors

Hsin-Yu Chen, Jose Marı́a Ezquiaga, and Ish Gupta

Class. Quant. Grav., Jul 2024

DOI Bib

@article{Chen:2024gdn,
  author = {Chen, Hsin-Yu and Ezquiaga, Jose Mar{\'\i}a and Gupta, Ish},
  title = {{Cosmography with next-generation gravitational wave detectors}},
  eprint = {2402.03120},
  archiveprefix = {arXiv},
  primaryclass = {gr-qc},
  doi = {10.1088/1361-6382/ad424f},
  journal = {Class. Quant. Grav.},
  volume = {41},
  number = {12},
  pages = {125004},
  year = {2024},
}

CQG

Characterizing gravitational wave detector networks: from A^♯to cosmic explorer

Ish Gupta and others

Class. Quant. Grav., Jul 2024

DOI Bib

@article{Gupta:2023lga,
  author = {Gupta, Ish and others},
  title = {{Characterizing gravitational wave detector networks: from A$^\sharp$ to cosmic explorer}},
  eprint = {2307.10421},
  archiveprefix = {arXiv},
  primaryclass = {gr-qc},
  reportnumber = {CE Document No. P2300019, CE Document No. P2300019-v2},
  doi = {10.1088/1361-6382/ad7b99},
  journal = {Class. Quant. Grav.},
  volume = {41},
  number = {24},
  pages = {245001},
  year = {2024},
}

PRD

Neutron star-black hole mergers in next generation gravitational-wave observatories

Ish Gupta, Ssohrab Borhanian, Arnab Dhani, and 4 more authors

Phys. Rev. D, Jul 2023

DOI Bib

@article{Gupta:2023evt,
  author = {Gupta, Ish and Borhanian, Ssohrab and Dhani, Arnab and Chattopadhyay, Debatri and Kashyap, Rahul and Villar, V. Ashley and Sathyaprakash, B. S.},
  title = {{Neutron star-black hole mergers in next generation gravitational-wave observatories}},
  eprint = {2301.08763},
  archiveprefix = {arXiv},
  primaryclass = {gr-qc},
  doi = {10.1103/PhysRevD.107.124007},
  journal = {Phys. Rev. D},
  volume = {107},
  number = {12},
  pages = {124007},
  year = {2023},
}

MNRAS

Using grey sirens to resolve the Hubble–Lemaı̂tre tension

Ish Gupta

Mon. Not. Roy. Astron. Soc., Jul 2023

DOI Bib

@article{Gupta:2022fwd,
  author = {Gupta, Ish},
  title = {{Using grey sirens to resolve the Hubble{\textendash}Lema{\^\i}tre tension}},
  eprint = {2212.00163},
  archiveprefix = {arXiv},
  primaryclass = {gr-qc},
  doi = {10.1093/mnras/stad2115},
  journal = {Mon. Not. Roy. Astron. Soc.},
  volume = {524},
  number = {3},
  pages = {3537--3558},
  year = {2023},
}