Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Gopakumar, Achamveedu"'
Autor:
Valtonen, Mauri J., Dey, Lankeswar, Gopakumar, Achamveedu, Zola, Staszek, Lähteenmäki, Anne, Tornikoski, Merja, Gupta, Alok C., Pursimo, Tapio, Knudstrup, Emil, Gomez, Jose L., Hudec, Rene, Jelínek, Martin, Štrobl, Jan, Berdyugin, Andrei V., Ciprini, Stefano, Reichart, Daniel E., Kouprianov, Vladimir V., Matsumoto, Katsura, Drozdz, Marek, Mugrauer, Markus, Sadun, Alberto, Zejmo, Michal, Sillanpää, Aimo, Lehto, Harry J., Nilsson, Kari, Imazawa, Ryo, Uemura, Makoto
We present a summary of the results of the OJ 287 observational campaign, which was carried out during the 2021/2022 observational season. This season is special in the binary model because the major axis of the precessing binary happens to lie almos
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______1106::2503e3d4db7bd2e7ec5f3b19e98d8a09
http://hdl.handle.net/10261/330416
http://hdl.handle.net/10261/330416
Gravitational Waves from Black-Hole Encounters: Prospects for Ground- and Galaxy-Based Observatories
Autor:
Dandapat, Subhajit, Ebersold, Michael, Susobhanan, Abhimanyu, Rana, Prerna, Gopakumar, Achamveedu, Tiwari, Shubhanshu, Haney, Maria, Lee, Hyung Mok, Kolhe, Neel
Close hyperbolic encounters of black holes (BHs) generate certain Burst With Memory (BWM) events in the frequency windows of the operational, planned, and proposed gravitational wave (GW) observatories. We present detailed explorations of the detecta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93b80f649e6ee1632dfaf69911c6f9b0
http://arxiv.org/abs/2305.19318
http://arxiv.org/abs/2305.19318
We present the first polarimetric space very long baseline interferometry (VLBI) observations of OJ 287, observed with RadioAstron at 22 GHz during a perigee session on 2014 April 4 and five near-in-time snapshots, together with contemporaneous groun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::659396c537454c5ecdf456117000b8c5
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3033802
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3033802
We compute the third post-Newtonian (3PN) accurate instantaneous contributions to the radiated gravitational wave (GW) energy and angular momentum arising from the hyperbolic passages of non-spinning compact objects. The present computations employ 3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8b51fdbd78b5cc7c8560dd371ae267a
We compute the third post-Newtonian (3PN) accurate instantaneous contributions to the radiated gravitational wave (GW) energy and angular momentum arising from the hyperbolic passages of non-spinning compact objects. The present computations employ 3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______1108::e59be426e74bdca4946949ba6b4a61ac
https://bib-pubdb1.desy.de/record/474336
https://bib-pubdb1.desy.de/record/474336
Publikováno v:
Physical review / D
Physical review / D 105(8), 084018 (2022). doi:10.1103/PhysRevD.105.084018
Physical review / D 105(8), 084018 (2022). doi:10.1103/PhysRevD.105.084018
Physical review / D 105(8), 084018 (2022). doi:10.1103/PhysRevD.105.084018
We compute the third post-Newtonian (3PN) accurate instantaneous contributions to the radiated gravitational wave energy and angular momentum arising from the hyperbolic
We compute the third post-Newtonian (3PN) accurate instantaneous contributions to the radiated gravitational wave energy and angular momentum arising from the hyperbolic
Autor:
Tiwari, Srishti, Gopakumar, Achamveedu
Observations of transient gravitational wave (GW) events with non-negligible orbital eccentricity can be highly rewarding from astrophysical considerations. Ready-to-use fully analytic frequency domain inspiral GW templates are crucial ingredients to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c14eb1078140d2e9b27f0540acbeb3d8
Autor:
Dey, Lankeswar, Gopakumar, Achamveedu, Valtonen, Mauri, Zola, Stanislaw, Susobhanan, Abhimanyu, Hudec, Rene, Pihajoki, Pauli, Pursimo, Tapio, Berdyugin, Andrei, Piirola, Vilppu, Ciprini, Stefano, Nilsson, Kari, Jermak, Helen, Kidger, Mark, Komossa, Stefanie
The bright blazar OJ 287 is the best-known candidate for hosting a nanohertz gravitational wave (GW) emitting supermassive binary black hole (SMBBH) in the present observable universe. The binary black hole (BBH) central engine model, proposed by Leh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______1593::49591a35902e90cd91898b45ed4cf74f
http://hdl.handle.net/10138/303521
http://hdl.handle.net/10138/303521
Autor:
Valtonen, Mauri, Zola, Stanislaw, Jermak, Helen, Ciprini, Stefano, Hudec, Rene, Dey, Lankeswar, Gopakumar, Achamveedu, Reichart, Daniel L., Caton, Daniel B., Gazeas, Kosmas, Matsumoto, Katsura, Ogloza, Waldemar, Drozdz, Marek, Alicavus, Fahri, Baransky, Oleksandr, Berdyugin, Andrei, Boumis, Panos, Bufan, Yurii, Debski, Bartlomiej, Er, Huseyin
We report optical photometric and polarimetric observations of the blazar OJ 287 gathered during 2016/17. The high level of activity, noticed after the General Relativity Centenary flare, is argued to be part of the follow-up flares that exhibited hi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=r39c86a4b39b::263c4bcc94f946a44d5af83ef726603f
https://aperta.ulakbim.gov.tr/record/50731
https://aperta.ulakbim.gov.tr/record/50731
Autor:
Gupta, Anuradha, Gopakumar, Achamveedu
We present a prescription to compute the time-domain gravitational wave (GW) polarization states associated with spinning compact binaries inspiraling along quasi-circular orbits. We invoke the orbital angular momentum ${\bf L}$ rather than its Newto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::494faf9947067eb48aa76f09821526c6