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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
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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
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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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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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