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CERN Document Server Encontrados 2,024 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.62 segundos. 
1.
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Nonlinear gravitational-wave memory from cusps and kinks on cosmic strings / Jenkins, Alexander C. (King's Coll. London) ; Sakellariadou, Mairi (King's Coll. London ; CERN)
The nonlinear memory effect is a fascinating prediction of general relativity (GR), in which oscillatory gravitational-wave (GW) signals are generically accompanied by a monotonically-increasing strain which persists in the detector long after the signal has passed. This effect presents a unique opportunity to test GR in the dynamical and nonlinear regime. [...]
arXiv:2102.12487; KCL-PH-TH/2021-04; CERN-TH-2021-016.- 2021-07-22 - 29 p. - Published in : Class. Quantum Gravity 38 (2021) 165004 Fulltext: document - HTM; 2102.12487 - PDF; Fulltext from publisher: PDF;
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Detecting circular polarisation in the stochastic gravitational-wave background from a first-order cosmological phase transition / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Fairbairn, Malcolm (King's Coll. London) ; Lewicki, Marek (King's Coll. London ; Warsaw U.) ; Vaskonen, Ville (King's Coll. London ; NICPB, Tallinn) ; Wickens, Alastair (King's Coll. London)
We discuss the observability of circular polarisation of the stochastic gravitational-wave background (SGWB) generated by helical turbulence following a first-order cosmological phase transition, using a model that incorporates the effects of both direct and inverse energy cascades. We explore the strength of the gravitational-wave signal and the dependence of its polarisation on the helicity fraction, $\zeta_*$, the strength of the transition, $\alpha$, the bubble size, $R_*$, and the temperature, $T_*$, at which the transition finishes. [...]
arXiv:2005.05278; KCL-PH-TH/2020-25; CERN-TH-2020-070.- 2020-10-12 - 31 p. - Published in : JCAP 2010 (2020) 032 Fulltext: PDF;
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(54)
Searching for parity violation with the LIGO-Virgo-KAGRA network / Martinovic, Katarina (Royal Holloway, U. of London) ; Badger, Charles (Royal Holloway, U. of London) ; Sakellariadou, Mairi (Royal Holloway, U. of London ; CERN) ; Mandic, Vuk (Minnesota U.)
A stochastic gravitational wave background is expected to emerge from the superposition of numerous gravitational wave sources of both astrophysical and cosmological origin. A number of cosmological models can have a parity violation, resulting in the generation of circularly polarised gravitational waves. [...]
arXiv:2103.06718.- 2021-10-04 - 6 p. - Published in : Phys. Rev. D 104 (2021) L081101 Fulltext: Fulltext from publisher - PDF; 2103.06718 - PDF;
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4.
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On the Maximal Strength of a First-Order Electroweak Phase Transition and its Gravitational Wave Signal / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Lewicki, Marek (King's Coll. London) ; No, José Miguel (King's Coll. London ; Madrid, IFT)
What is the maximum possible strength of a first-order electroweak phase transition and the resulting gravitational wave (GW) signal? While naively one might expect that supercooling could increase the strength of the transition to very high values, for strong supercooling the Universe is no longer radiation-dominated and the vacuum energy of the unstable minimum of the potential dominates the expansion, which can jeopardize the successful completion of the phase transition. After providing a general treatment for the nucleation, growth and percolation of broken phase bubbles during a first-order phase transition that encompasses the case of significant supercooling, we study the conditions for successful bubble percolation and completion of the electroweak phase transition in theories beyond the Standard Model featuring polynominal potentials. [...]
arXiv:1809.08242; KCL-PH-TH/2018-46; CERN-TH/2018-197; IFT-UAM/CSIC-18-94; CERN-TH-2018-197.- 2019 - 36 p. - Published in : JCAP 04 (2019) 003 Fulltext: PDF;
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Scattering of scalar, electromagnetic and gravitational waves from binary systems / Annulli, Lorenzo (Lisbon, CENTRA) ; Bernard, Laura (Lisbon, CENTRA) ; Blas, Diego (King's Coll. London ; CERN) ; Cardoso, Vitor (Lisbon, CENTRA ; CERN)
The direct detection of gravitational waves crowns decades of efforts in the modelling of sources and of increasing detectors' sensitivity. With future third-generation Earth-based detectors or space-based observatories, gravitational-wave astronomy will be at its full bloom. [...]
arXiv:1809.05108; CERN-TH-2018-184; KCL-PH-TH/2018-34.- 2018-10-02 - 20 p. - Published in : Phys. Rev. D 98 (2018) 084001 Fulltext: PDF; Fulltext from Publisher: PDF;
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(46)
Simultaneous estimation of astrophysical and cosmological stochastic gravitational-wave backgrounds with terrestrial detectors / Martinovic, Katarina (King's Coll. London (main)) ; Meyers, Patrick M. (Melbourne U.) ; Sakellariadou, Mairi (CERN) ; Christensen, Nelson (ARTEMIS, Nice)
The recent Advanced LIGO and Advanced Virgo joint observing runs have not claimed a stochastic gravitational-wave background detection, but one expects this to change as the sensitivity of the detectors improves. The challenge of claiming a true detection will be immediately succeeded by the difficulty of relating the signal to the sources that contribute to it. [...]
arXiv:2011.05697.- 2021-02-27 - 8 p. - Published in : Phys. Rev. D 103 (2021) 043023 Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;
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Mirage of Luminal Modified Gravitational-Wave Propagation / Romano, Antonio Enea (CERN ; ICRA, Pescara ; Antioquia U.) ; Sakellariadou, Mairi (King's Coll. London)
Using conformal invariance of gravitational waves, we show that for a luminal modified gravity theory, the gravitational-wave propagation and luminosity distance are the same as in general relativity. The relation between the gravitational-wave and electromagnetic-wave luminosity distance gets however modified for electromagnetism minimally coupled to the Jordan frame metric. [...]
arXiv:2302.05413; CERN-TH-2023-017; KCL-PH-TH-2023-08.- 2023-06-08 - 5 p. - Published in : Phys. Rev. Lett. 130 (2023) 231401 Fulltext: 2302.05413 - PDF; Publication - PDF;
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Probing modified Hawking evaporation with gravitational waves from the primordial black hole dominated universe / Balaji, Shyam (King's Coll. London) ; Domènech, Guillem (Hannover U. ; Hannover, Max Planck Inst. Grav.) ; Franciolini, Gabriele (CERN) ; Ganz, Alexander (Hannover U.) ; Tränkle, Jan (Hannover U.)
It has been recently proposed that Hawking evaporation might slow down after a black hole has lost about half of its mass. Such an effect, called "memory burden", is parameterized as a suppression in the mass loss rate by negative powers $n$ of the black hole entropy and could considerably extend the lifetime of a black hole. [...]
arXiv:2403.14309.- 2024-11-19 - 18 p. - Published in : JCAP 2411 (2024) 026 Fulltext: 2403.14309 - PDF; document - PDF;
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Implications for First-Order Cosmological Phase Transitions from the Third LIGO-Virgo Observing Run / Romero, Alba (Barcelona, IFAE) ; Martinovic, Katarina (King's Coll. London) ; Callister, Thomas A. (Flatiron Inst., New York) ; Guo, Huai-Ke (Oklahoma U.) ; Martínez, Mario (Barcelona, IFAE ; ICREA, Barcelona) ; Sakellariadou, Mairi (King's Coll. London ; CERN) ; Yang, Feng-Wei (Utah U.) ; Zhao, Yue (Utah U.)
We place constrains on the normalised energy density in gravitational waves from first-order strong phase transitions using data from Advanced LIGO and Virgo's first, second and third observing runs. First, adopting a broken power law model, we place $95 \%$ confidence level upper limits simultaneously on the gravitational-wave energy density at 25 Hz from unresolved compact binary mergers, $\Omega_{\rm cbc} < 5.9 \times 10^{-9}$, and strong first-order phase transitions, $\Omega_{\rm bpl} < 2.8 \times 10^{-9}$. [...]
arXiv:2102.01714.- 2021-04-17 - 7 p. - Published in : Phys. Rev. Lett. 126 (2021) 151301 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from publisher: PDF;
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(39)
Gravitational wave energy budget in strongly supercooled phase transitions / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Lewicki, Marek (King's Coll. London) ; No, José Miguel (Madrid, IFT) ; Vaskonen, Ville (King's Coll. London)
We derive efficiency factors for the production of gravitational waves through bubble collisions and plasma-related sources in strong phase transitions, and find the conditions under which the bubble collisions can contribute significantly to the signal. We use lattice simulations to clarify the dependence of the colliding bubbles on their initial state. [...]
arXiv:1903.09642; KCL-PH-TH/2019-32; CERN-TH-2019-032; IFT-UAM/CSIC-19-32.- 2019-06-10 - 25 p. - Published in : JCAP 06 (2019) 024 Fulltext: PDF;
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