AG
A. Gopakumar
gr-qcastro-ph.HEastro-ph.COastro-ph.GAastro-ph.IMastro-ph.SRastro-phData analysisElectromagnetic counterpartsGravitational-wave detectors
On Valency
published · living versionsW_cysfnubj·v1 · currentpublished
The second data release from the European Pulsar Timing Array: IV. Implications for massive black holes, dark matter and the early Universe
with J. Antoniadis, P. Arumugam, S. Arumugam, P. Auclair +109
1 version
W_7v884hrf·v1published
Preprints & journals
197 papers in the corpus · 1997–2026The October 2022 flare in OJ 287 and the mass of its primary black hole2609.04998v1 · Mauri J. Valtonen, Staszek Zola, Manpreet Singh et al.2026 · 0 citationsarXiv
Efficient time-domain eccentric model for Galactic binaries in LISA2608.24546v1 · Shubhanshu Tiwari, Johan O. A. Robertsson, A. Gopakumar et al.2026 · 0 citationsarXiv
The Indian Pulsar Timing Array Data Release 2: III. Search for a Stochastic Gravitational Wave Background2608.02808v1 · Hemanga Tahbildar, Kunjal Vara, Mayuresh Surnis et al.2026 · 0 citationsarXiv
Constraining Orbital Eccentricity of a Supermassive Black Hole Binary Candidate PKS 2131-02112606.05343v1 · Avinash Kumar Paladi, A. Gopakumar, Sushmita Agarwal et al.2026 · 0 citationsarXiv
On the Presence of a Tertiary Compact Object in GW1908142605.21955v1 · Lalit Pathak, Hemantakumar Phurailatpam, Achamveedu Gopakumar2026 · 0 citationsarXiv
On Constraining the Proposed Hierarchical Triple Scenario for an Eccentric Milli-Second Pulsar Binary PSR J1618-39212512.02857v1 · Adya Shukla, A. Gopakumar, Paramasivan Arumugam2025 · 0 citationsarXiv
Identifying the secondary jet in the RadioAstron image of OJ~2872510.06744v1 · Mauri J. Valtonen, Lankeswar Dey, Staszek Zola et al.2025 · 5 citationsThe Astrophysical Journal, October 9, 2025
The Indian Pulsar Timing Array Data Release 2: I. Dataset and Timing Analysis2506.16769v1 · Prerna Rana, Pratik Tarafdar, Nobleson K et al.2025 · 8 citationsarXiv
External Attention Transformer: A Robust AI Model for Identifying Initial Eccentricity Signatures in Binary Black Hole Events in Simulated Advanced LIGO Data2506.03634v2 · Elahe Khalouei, Cristiano G. Sabiu, Hyung Mok Lee et al.2025 · 2 citationsarXiv
On the evidence of a dark matter density spike around the primary black hole in OJ 2872504.05715v1 · Debabrata Deb, Achamveedu Gopakumar, Mauri J. Valtonen2025 · 4 citationsarXiv
Gravitational physics in the context of Indian astronomy: A vision document2501.04333v1 · P. Ajith, K. G. Arun, Sukanta Bose et al.2025 · 1 citationJournal of Astrophysics and Astronomy, 46, 1 (2025)
Evidence of jet activity from the secondary black hole in the OJ287 binary system2405.08627v1 · Mauri J. Valtonen, Staszek Zola, Alok C. Gupta et al.2024 · 17 citationsarXiv
Efficient prescription to search for linear gravitational wave memory from hyperbolic black hole encounters and its application to the NANOGrav 12.5-year dataset2402.03472v3 · Subhajit Dandapat, Abhimanyu Susobhanan, Lankeswar Dey et al.2024 · 3 citationsPhys. Rev. D 109, 103018, 2024
The NANOGrav 12.5-year data set: A computationally efficient eccentric binary search pipeline and constraints on an eccentric supermassive binary candidate in 3C 66B2309.17438v2 · Gabriella Agazie, Zaven Arzoumanian, Paul T. Baker et al.2023 · 18 citationsAstrophysical Journal, 2024
Improving DM estimates using low-frequency scattering-broadening estimates2309.16765v2 · Jaikhomba Singha, Bhal Chandra Joshi, M. A. Krishnakumar et al.2023 · 2 citationsarXiv
Comparing recent PTA results on the nanohertz stochastic gravitational wave background2309.00693v1 · G. Agazie, J. Antoniadis, A. Anumarlapudi et al.2023 · 17 citationsarXiv
On the need of an ultramassive black hole in OJ 2872308.03017v1 · Mauri J. Valtonen, Staszek Zola, Achamveedu Gopakumar et al.2023 · 8 citationsarXiv
Observational Implications of OJ 287's Predicted 2022 Disk Impact in the Black Hole Binary Model2308.01878v1 · Mauri J. Valtonen, Lankeswar Dey, Achamveedu Gopakumar et al.2023 · 8 citationsarXiv
The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals2306.16214v1 · J. Antoniadis, P. Arumugam, S. Arumugam et al.2023 · 1,047 citationsA&A 678, A50 (2023)on Valency
The second data release from the European Pulsar Timing Array II. Customised pulsar noise models for spatially correlated gravitational waves2306.16225v1 · J. Antoniadis, P. Arumugam, S. Arumugam et al.2023 · 100 citationsA&A 678, A49 (2023)
The second data release from the European Pulsar Timing Array V. Search for continuous gravitational wave signals2306.16226v3 · J. Antoniadis, P. Arumugam, S. Arumugam et al.2023 · 94 citationsA&A 690, A118 (2024)
The second data release from the European Pulsar Timing Array: IV. Implications for massive black holes, dark matter and the early Universe2306.16227v2 · J. Antoniadis, P. Arumugam, S. Arumugam et al.2023 · 67 citationsarXivon Valency
Gravitational Waves from Black-Hole Encounters: Prospects for Ground- and Galaxy-Based Observatories2305.19318v1 · Subhajit Dandapat, Michael Ebersold, Abhimanyu Susobhanan et al.2023 · 19 citationsarXiv
Multi-band Extension of the Wideband Timing Technique2304.13072v2 · Avinash Kumar Paladi, Churchil Dwivedi, Prerna Rana et al.2023 · 5 citationsarXiv
Refining the 2022 OJ 287 impact flare arrival epoch2303.15886v2 · Mauri J. Valtonen, Staszek Zola, Gopakumar et al.2023 · 23 citationsarXiv
Noise analysis of the Indian Pulsar Timing Array data release I2303.12105v2 · Aman Srivastava, Shantanu Desai, Neel Kolhe et al.2023 · 17 citationsarXiv
Refining the prediction for OJ 287 next impact flare arrival epoch2209.08360v1 · Mauri J. Valtonen, Staszek Zola, A. Gopakumar et al.2022 · 3 citationsarXiv
Observational limits on the rate of radiation-driven binary black hole capture events2208.07762v3 · Michael Ebersold, Shubhanshu Tiwari, Leigh Smith et al.2022 · 12 citationsPhys. Rev. D 106, 104014 (2022)
Search for Subsolar-Mass Binaries in the First Half of Advanced LIGO's and Advanced Virgo's Third Observing Run.36018635 · Abbott, R, Abbott, T D, Acernese, F et al.2025 · 70 citationsPhysical review letters. 2022;129(6):061104
Nanohertz Gravitational Wave Astronomy during the SKA Era: An InPTA perspective2207.06461v1 · Bhal Chandra Joshi, Achamveedu Gopakumar, Arul Pandian et al.2022 · 24 citationsarXiv
The Indian Pulsar Timing Array: First data release2206.09289v3 · Pratik Tarafdar, Nobleson K., Prerna Rana et al.2022 · 85 citationsPublications of the Astronomical Society of Australia, Volume 39, 2022, e053
Host galaxy magnitude of OJ 287 from its colours at minimum light2205.15589v1 · Mauri J. Valtonen, Lankeswar Dey, S. Zola et al.2022 · 5 citationsarXiv
Unravelling the Innermost Jet Structure of OJ 287 with the First GMVA+ALMA Observations2205.00554v1 · Guang-Yao Zhao, Jose L. Gomez, Antonio Fuentes et al.2022 · 28 citationsApJ 932 (2022) 72
Search for Gravitational Waves Associated with Fast Radio Bursts Detected by CHIME/FRB During the LIGO--Virgo Observing Run O3a2203.12038v1 · the CHIME/FRB Collaboration: R. Abbott, T. D. Abbott, F. Acernese et al.2022 · 32 citationsarXiv
Narrowband searches for continuous and long-duration transient gravitational waves from known pulsars in the LIGO-Virgo third observing run2112.10990v2 · R. Abbott, T. D. Abbott, F. Acernese et al.2021 · 69 citationsApJ, 932, 133 (2022)
Promise of persistent multi-messenger astronomy with the blazar OJ 2872112.10102v2 · Mauri J. Valtonen, Lankeswar Dey, A. Gopakumar et al.2021 · 31 citationsarXiv
Search of the Early O3 LIGO Data for Continuous Gravitational Waves from the Cassiopeia A and Vela Jr. Supernova Remnants2111.15116v2 · R. Abbott, T. D. Abbott, F. Acernese et al.2021 · 40 citationsarXiv
Probing the innermost regions of AGN jets and their magnetic fields with RadioAstron. V. Space and ground millimeter-VLBI imaging of OJ 2872111.11200v2 · Jose L. G'omez, Efthalia Traianou, Thomas P. Krichbaum et al.2021 · 49 citationsApJ 924 (2022) 122
GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo During the Second Part of the Third Observing Run2111.03606v3 · R. Abbott, T. D. Abbott, F. Acernese et al.2021 · 1,761 citationsPhys. Rev. X; 13(4):041039; 2023
The population of merging compact binaries inferred using gravitational waves through GWTC-32111.03634v5 · R. Abbott, T. D. Abbott, F. Acernese et al.2021 · 889 citationsPhysical Review X 13, 011048 (2023)
Third order post-Newtonian gravitational radiation from two-body scattering: Instantaneous energy and angular momentum radiation2111.00818v3 · Gihyuk Cho, Subhajit Dandapat, Achamveedu Gopakumar2021 · 16 citationsPhys. Rev. D 105, 084018 (2022)
All-sky, all-frequency directional search for persistent gravitational-waves from Advanced LIGO's and Advanced Virgo's first three observing runs2110.09834v2 · R. Abbott, T. D. Abbott, F. Acernese et al.2021 · 32 citationsPhys.Rev.D 105 (2022) 12, 122001
Generalized quasi-Keplerian solution for eccentric, non-spinning compact binaries at 4PN order and the associated IMR waveform2110.09608v3 · Gihyuk Cho, Sashwat Tanay, Achamveedu Gopakumar et al.2021 · 46 citationsPhys. Rev. D 105, 064010 (2022)
Search for continuous gravitational waves from 20 accreting millisecond X-ray pulsars in O3 LIGO data2109.09255v2 · R. Abbott, T. D. Abbott, F. Acernese et al.2021 · 59 citationsPhys. Rev. D 105, 022002 (2022)
GWTC-2.1: Deep Extended Catalog of Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run2108.01045v2 · R. Abbott, T. D. Abbott, F. Acernese et al.2021 · 638 citationsarXiv
All-sky search for long-duration gravitational-wave bursts in the third Advanced LIGO and Advanced Virgo run2107.13796v1 · R. Abbott, T. D. Abbott, F. Acernese et al.2021 · 48 citationsarXiv
Evidence for profile changes in PSR J1713+0747 using the uGMRT2107.04607v2 · Jaikhomba Singha, Mayuresh P Surnis, Bhal Chandra Joshi et al.2021 · 35 citationsarXiv
All-sky search for short gravitational-wave bursts in the third Advanced LIGO and Advanced Virgo run2107.03701v1 · R. Abbott, T. D. Abbott, F. Acernese et al.2021 · 79 citationsarXiv
All-sky Search for Continuous Gravitational Waves from Isolated Neutron Stars in the Early O3 LIGO Data2107.00600v2 · R. Abbott, T. D. Abbott, S. Abraham et al.2021 · 66 citationsPhys. Rev. D 104, 082004 (2021)
Observation of gravitational waves from two neutron star-black hole coalescences2106.15163v1 · R. Abbott, T. D. Abbott, S. Abraham et al.2021 · 763 citationsApJL, 915, L5 (2021)
Career total: at least 276 works. 197 are in this corpus.Showing the 50 most recent.
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