نتایج جستجو برای: gravitational waves

تعداد نتایج: 147803  

1992
Asghar Qadir

Ehlers and Kundt have provided an approximate procedure to demonstrate that gravitational waves impart momentum to test particles. This was extended to cylindrical gravitational waves by Weber and Wheeler. Here a general, exact, formula for the momentum imparted to test particles in arbitrary spacetimes is presented.

2007
Dominik J. Schwarz

The spectrum of gravitational waves that have been produced in innation is modiied during cosmological transitions. Large drops in the number of relativistic particles, like in the QCD transition or at the e + e ?-annihilation, lead to steps in the energy spectrum of gravitational waves.

2004
Shiho Kobayashi Pablo Laguna

Gravitational waves and X-ray flares are expected from tidal disruption of stars by a massive black hole. Using a relativistic smoothed particle hydrodynamics code, we investigate the fate of main sequence and Helium stars in plunge orbits passing near Schwarzschild or a Kerr black holes of mass ∼ 10M⊙. We show that quadrupole gravitational waves emitted during the tidal disruption process are ...

2002
Shiho Kobayashi

We study gravitational radiation from various proposed gamma-ray burst (GRB) progenitor models, in particular compact mergers and massive stellar collapses. These models have in common a high angular rotation rate, and the final stage involves a rotating black hole and accretion disk system. We consider the in-spiral, merger and ringing phases, and for massive collapses we consider the possible...

2014
Devin Hansen Nicolás Yunes Kent Yagi

Gravitational waves are excellent tools to probe the foundations of General Relativity in the strongly dynamical and non-linear regime. One such foundation is Lorentz symmetry, which can be broken in the gravitational sector by the existence of a preferred time direction, and thus, a preferred frame at each spacetime point. This leads to a modification in the orbital decay rate of binary system...

2004
Nils Andersson Kostas D Kokkotas

As several large scale interferometers are beginning to take data at sensitivities where astrophysical sources are predicted, the direct detection of gravitational waves may well be imminent. This would (finally) open the long anticipated gravitational-wave window to our Universe, and should lead to a much improved understanding of the most violent processes imaginable; the formation of black h...

2003
Fredrick A. Jenet Andrea Lommen Shane L. Larson Linqing Wen

Data from long term timing observations of the radio pulsar PSR B1855+09 have been searched for the signature of gravitational waves (G-waves) emitted by the proposed supermassive binary black hole system in 3C66B. For the case of a circular orbit, the emitted G-waves would generate detectable fluctuations in the pulse arrival times of PSR B1855+09. General expressions for the expected timing r...

2007
H. Asada

None of N-body gravitating systems have been considered to emit periodic gravitational waves because of their chaotic orbits when N = 3 (or more). We employ a figure-eight orbit as a specific model for a 3-body system in order to illustrate that some of triple stars are capable of generating periodic waves. This illustration would imply that a certain class of N-body gravitating systems may be ...

2016
Emanuele Berti

F or decades, scientists have hoped they could “listen in” on violent astrophysical events by detecting their emission of gravitational waves. The waves, which can be described as oscillating distortions in the geometry of spacetime, were first predicted to exist by Einstein in 1916, but they have never been observed directly. Now, in an extraordinary paper, scientists report that they have det...

Journal: :Physical review letters 2017
B P Abbott R Abbott T D Abbott M R Abernathy F Acernese K Ackley C Adams T Adams P Addesso R X Adhikari V B Adya C Affeldt M Agathos K Agatsuma N Aggarwal O D Aguiar L Aiello A Ain P Ajith B Allen A Allocca P A Altin A Ananyeva S B Anderson W G Anderson S Appert K Arai M C Araya J S Areeda N Arnaud K G Arun S Ascenzi G Ashton M Ast S M Aston P Astone P Aufmuth C Aulbert A Avila-Alvarez S Babak P Bacon M K M Bader P T Baker F Baldaccini G Ballardin S W Ballmer J C Barayoga S E Barclay B C Barish D Barker F Barone B Barr L Barsotti M Barsuglia D Barta J Bartlett I Bartos R Bassiri A Basti J C Batch C Baune V Bavigadda M Bazzan C Beer M Bejger I Belahcene M Belgin A S Bell B K Berger G Bergmann C P L Berry D Bersanetti A Bertolini J Betzwieser S Bhagwat R Bhandare I A Bilenko G Billingsley C R Billman J Birch R Birney O Birnholtz S Biscans A S Biscoveanu A Bisht M Bitossi C Biwer M A Bizouard J K Blackburn J Blackman C D Blair D G Blair R M Blair S Bloemen O Bock M Boer G Bogaert A Bohe F Bondu R Bonnand B A Boom R Bork V Boschi S Bose Y Bouffanais A Bozzi C Bradaschia P R Brady V B Braginsky M Branchesi J E Brau T Briant A Brillet M Brinkmann V Brisson P Brockill J E Broida A F Brooks D A Brown D D Brown N M Brown S Brunett C C Buchanan A Buikema T Bulik H J Bulten A Buonanno D Buskulic C Buy R L Byer M Cabero L Cadonati G Cagnoli C Cahillane J Calderón Bustillo T A Callister E Calloni J B Camp W Campbell M Canepa K C Cannon H Cao J Cao C D Capano E Capocasa F Carbognani S Caride J Casanueva Diaz C Casentini S Caudill M Cavaglià F Cavalier R Cavalieri G Cella C B Cepeda L Cerboni Baiardi G Cerretani E Cesarini S J Chamberlin M Chan S Chao P Charlton E Chassande-Mottin B D Cheeseboro H Y Chen Y Chen H-P Cheng A Chincarini A Chiummo T Chmiel H S Cho M Cho J H Chow N Christensen Q Chu A J K Chua S Chua S Chung G Ciani F Clara J A Clark F Cleva C Cocchieri E Coccia P-F Cohadon A Colla C G Collette L Cominsky M Constancio L Conti S J Cooper T R Corbitt N Cornish A Corsi S Cortese C A Costa E Coughlin M W Coughlin S B Coughlin J-P Coulon S T Countryman P Couvares P B Covas E E Cowan D M Coward M J Cowart D C Coyne R Coyne J D E Creighton T D Creighton J Cripe S G Crowder T J Cullen A Cumming L Cunningham E Cuoco T Dal Canton S L Danilishin S D'Antonio K Danzmann A Dasgupta C F Da Silva Costa V Dattilo I Dave M Davier G S Davies D Davis E J Daw B Day R Day S De D DeBra G Debreczeni J Degallaix M De Laurentis S Deléglise W Del Pozzo T Denker T Dent V Dergachev R De Rosa R T DeRosa R DeSalvo J Devenson R C Devine S Dhurandhar M C Díaz L Di Fiore M Di Giovanni T Di Girolamo A Di Lieto S Di Pace I Di Palma A Di Virgilio Z Doctor V Dolique F Donovan K L Dooley S Doravari I Dorrington R Douglas M Dovale Álvarez T P Downes M Drago R W P Drever J C Driggers Z Du M Ducrot S E Dwyer T B Edo M C Edwards A Effler H-B Eggenstein P Ehrens J Eichholz S S Eikenberry R C Essick Z Etienne T Etzel M Evans T M Evans R Everett M Factourovich V Fafone H Fair S Fairhurst X Fan S Farinon B Farr W M Farr E J Fauchon-Jones M Favata M Fays H Fehrmann M M Fejer A Fernández Galiana I Ferrante E C Ferreira F Ferrini F Fidecaro I Fiori D Fiorucci R P Fisher R Flaminio M Fletcher H Fong S S Forsyth J-D Fournier S Frasca F Frasconi Z Frei A Freise R Frey V Frey E M Fries P Fritschel V V Frolov P Fulda M Fyffe H Gabbard B U Gadre S M Gaebel J R Gair L Gammaitoni S G Gaonkar F Garufi G Gaur V Gayathri N Gehrels G Gemme E Genin A Gennai J George L Gergely V Germain S Ghonge Abhirup Ghosh Archisman Ghosh S Ghosh J A Giaime K D Giardina A Giazotto K Gill A Glaefke E Goetz R Goetz L Gondan G González J M Gonzalez Castro A Gopakumar M L Gorodetsky S E Gossan M Gosselin R Gouaty A Grado C Graef M Granata A Grant S Gras C Gray G Greco A C Green P Groot H Grote S Grunewald G M Guidi X Guo A Gupta M K Gupta K E Gushwa E K Gustafson R Gustafson J J Hacker B R Hall E D Hall G Hammond M Haney M M Hanke J Hanks C Hanna M D Hannam J Hanson T Hardwick J Harms G M Harry I W Harry M J Hart M T Hartman C-J Haster K Haughian J Healy A Heidmann M C Heintze H Heitmann P Hello G Hemming M Hendry I S Heng J Hennig J Henry A W Heptonstall M Heurs S Hild D Hoak D Hofman K Holt D E Holz P Hopkins J Hough E A Houston E J Howell Y M Hu E A Huerta D Huet B Hughey S Husa S H Huttner T Huynh-Dinh N Indik D R Ingram R Inta H N Isa J-M Isac M Isi T Isogai B R Iyer K Izumi T Jacqmin K Jani P Jaranowski S Jawahar F Jiménez-Forteza W W Johnson D I Jones R Jones R J G Jonker L Ju J Junker C V Kalaghatgi V Kalogera S Kandhasamy G Kang J B Kanner S Karki K S Karvinen M Kasprzack E Katsavounidis W Katzman S Kaufer T Kaur K Kawabe F Kéfélian D Keitel D B Kelley R Kennedy J S Key F Y Khalili I Khan S Khan Z Khan E A Khazanov N Kijbunchoo Chunglee Kim J C Kim Whansun Kim W Kim Y-M Kim S J Kimbrell E J King P J King R Kirchhoff J S Kissel B Klein L Kleybolte S Klimenko P Koch S M Koehlenbeck S Koley V Kondrashov A Kontos M Korobko W Z Korth I Kowalska D B Kozak C Krämer V Kringel A Królak G Kuehn P Kumar R Kumar L Kuo A Kutynia B D Lackey M Landry R N Lang J Lange B Lantz R K Lanza A Lartaux-Vollard P D Lasky

We employ gravitational-wave radiometry to map the stochastic gravitational wave background expected from a variety of contributing mechanisms and test the assumption of isotropy using data from the Advanced Laser Interferometer Gravitational Wave Observatory's (aLIGO) first observing run. We also search for persistent gravitational waves from point sources with only minimal assumptions over th...

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