Dr. Ofek Birnholtz is the PI of Bar-Ilan's LIGO group, as part of the international LIGO Scientific Collaboration, with a focus on studying Gravitational Waves, and through them Astrophysical systems of Black Holes, Neutron Stars, and phenomena in General Relativity, and beyond.

• Y. Dandekar, E. Springer, S. Zard, A. A. Trani, B. Kol, O. Birnholtz, "Planar Three-Body Problem: theoretical predictions and simulation results", arXiv:2608.30414

• M. Sade, A. Tsarfati, O. Birnholtz, "Gamma Ray Bursts Effects on Extinction and Survivability in the Galaxy", arXiv:2603.18250

• O. Dan & O. Birnholtz, "TROYE: Modeling Dynamic Phase Transitions in Gravitational Waves from Neutron Star-Black Hole Mergers", arXiv:2602.18105

• LIGO-Virgo-KAGRA Collaboration, "GWTC-5.0: Tests of General Relativity", arXiv:2607.19293

• LIGO-Virgo-KAGRA Collaboration, "GWTC-5.0: Constraints on the Cosmic Expansion Rate and Modified Gravitational-wave", arXiv:2605.27227

• LIGO-Virgo-KAGRA Collaboration, "GWTC-4.0: Tests of General Relativity. I. Overview and General Tests", arXiv2603.19019

• LIGO-Virgo-KAGRA Collaboration, "GWTC-4.0: Tests of General Relativity. II. Parameterized Tests", arXiv:2603.19020

• LIGO-Virgo-KAGRA Collaboration, "GWTC-4.0: Tests of General Relativity. III. Tests of the Remnants", arXiv:2603.19021

• I. Hamoudy, J. Westerweck, O. Birnholtz, "Constraining Black Hole Horizon Properties Through Long-Duration Gravitational Wave Observations", arXiv:2511.06536

• Daniel Skorohod & Ofek Birnholtz, "Two-Step Localization Method for Electromagnetic Follow-Up of LIGO-Virgo-KAGRA Gravitational-Wave Triggers", Universe 2026, 12(1), 21, https://www.mdpi.com/2218-1997/12/1/21

• I. Hamoudy, J. Westerweck, O. Birnholtz, "Constraining Black Hole Horizon Properties Through Long-Duration Gravitational Wave Observations", arXiv:2511.06536

• E. D. Emtsova, O. Birnholtz, "Are the Circular Polarizations of Observed Gravitational-Waves Even-Handed?", arXiv:2508.17103

• Yehu I. Maimon, Alex B. Nielsen, Ofek Birnholtz, "Constraining Dirty Black Holes and pseudo-complex General Relativity with the Gravitational Waves Transient Catalog 3.0", Class. Quantum Grav. 42 185011, arXiv:2505.10199

• Daniel Rozental, Ofek Birnholtz, "κ-General-Relativity II: An Astrophysical Observable from a 2-Body system", Phys. Rev. D 112, 064072, arXiv:2504.18669

• Yogesh Dandekar, Barak Kol, "Distribution of regularized three-body phase-volume", arXiv:2501.02013

• E. D. Emtsova, A. N. Petrov, A. V. Toporensky, "Mass and angular momentum for the Kerr black hole in TEGR and STEGR", arXiv:2409.10529

• Daniel Rozental, Ofek Birnholtz, "κ-General-Relativity I: a Non-Commutative GR Theory with the κ-Minkowski Spacetime as its Flat Limit", Class. Quantum Grav. 42 185006, arXiv:2408.11955

• Elise M. Sänger, Soumen Roy, Michalis Agathos, Ofek Birnholtz et al., "Tests of General Relativity with GW230529: a neutron star merging with a lower mass-gap compact object", arXiv:2406.03568