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Gravitational waves in massive gravity theories: waveforms, fluxes and constraints from extreme-mass-ratio mergers
/ Cardoso, Vitor (Lisbon, CENTRA ; Lisbon, IST ; CERN) ; Castro, Gonçalo (Lisbon, CENTRA ; Lisbon, IST) ; Maselli, Andrea (Lisbon, CENTRA ; Lisbon, IST)
Is the graviton massless? This problem was addressed in the literature at a phenomenological level, using modified dispersion relations for gravitational waves, in linearized calculations around flat space. Here, we perform a detailed analysis of the gravitational waveform produced when a small particle plunges or inspirals into a large non-spinning black hole. [...]
arXiv:1809.00673.-
2018-12-18 - 6 p.
- Published in : Phys. Rev. Lett. 121 (2018) 251103
Fulltext: PDF; Fulltext from Publisher: PDF;
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Cosmological analogies in the search for new physics in high-energy collisions
/ Sanchis-Lozano, Miguel-Angel (Valencia U., IFIC ; Valencia U.) ; Sarkisyan-Grinbaum, Edward K. (CERN ; Texas U., Arlington) ; Domenech-Garret, Juan-Luis (Madrid, Polytechnic U.) ; Sanchis-Gual, Nicolas (Lisbon, IST)
In this paper, analogies between multiparticle production in high-energy collisions and the time evolution of the early universe are discussed. A common explanation is put forward under the assumption of an unconventional early state: a rapidly expanding universe before recombination (last scattering surface), followed by the CMB, later evolving up to present days, versus the formation of hidden/dark states in hadronic collisions followed by a conventional QCD parton shower yielding final-state particles. [...]
arXiv:2006.06569; IFIC/20-28; FTUV-20-06-11.-
2020-08-11 - 7 p.
- Published in : Phys. Rev. D 102 (2020) 035013
Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF;
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Gravitational-wave signatures of exotic compact objects and of quantum corrections at the horizon scale
/ Cardoso, Vitor (Lisbon, CENTRA ; Lisbon, IST ; Perimeter Inst. Theor. Phys. ; CERN) ; Hopper, Seth (Lisbon, CENTRA ; Lisbon, IST) ; Macedo, Caio F. B. (Lisbon, CENTRA ; Lisbon, IST) ; Palenzuela, Carlos (U. Iles Balears, Palma) ; Pani, Paolo (Rome U. ; INFN, Rome ; Lisbon, CENTRA ; Lisbon, IST)
Gravitational waves from binary coalescences provide one of the cleanest signatures of the nature of compact objects. It has been recently argued that the post-merger ringdown waveform of exotic ultracompact objects is initially identical to that of a black-hole, and that putative corrections at the horizon scale will appear as secondary pulses after the main burst of radiation. [...]
arXiv:1608.08637.-
2016-10-21 - 13 p.
- Published in : Phys. Rev. D 94 (2016) 084031
APS Open Access article: PDF; Fulltext: arXiv:1608.08637 - PDF; 10.1103_PhysRevD.94.084031 - PDF; External link: Preprint
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Holographic Bubbles with Jecco: Expanding, Collapsing and Critical
/ Bea, Yago (Helsinki Inst. of Phys. ; ICC, Barcelona U.) ; Casalderrey-Solana, Jorge (ICC, Barcelona U.) ; Giannakopoulos, Thanasis (Lisbon, CENTRA) ; Jansen, Aron (ICC, Barcelona U.) ; Mateos, David (ICC, Barcelona U. ; ICREA, Barcelona) ; Sanchez-Garitaonandia, Mikel (ICC, Barcelona U.) ; Zilhão, Miguel (Lisbon, CENTRA ; Aveiro U.)
Cosmological phase transitions can proceed via the nucleation of bubbles that subsequently expand and collide. [...]
arXiv:2202.10503.
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60 p.
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Spinodal Gravitational Waves
/ Bea, Yago (Helsinki Inst. of Phys. ; Helsinki U. ; ICC, Barcelona U.) ; Casalderrey-Solana, Jorge (ICC, Barcelona U.) ; Giannakopoulos, Thanasis (Lisbon, CENTRA) ; Jansen, Aron (ICC, Barcelona U.) ; Krippendorf, Sven (Munich U., ASC) ; Mateos, David (ICC, Barcelona U. ; ICREA, Barcelona) ; Sanchez-Garitaonandia, Mikel (ICC, Barcelona U.) ; Zilhão, Miguel (Lisbon, CENTRA ; Aveiro U.)
We uncover a new gravitational-wave production mechanism in cosmological, first-order, thermal phase transitions. [...]
arXiv:2112.15478.
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46 p.
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Superradiance in rotating stars and pulsar-timing constraints on dark photons
/ Cardoso, Vitor (Lisbon, CENTRA ; Lisbon, IST ; Perimeter Inst. Theor. Phys.) ; Pani, Paolo (INFN, Rome ; Lisbon, CENTRA ; Lisbon, IST ; Rome U.) ; Yu, Tien-Tien (CERN)
In the presence of massive bosonic degrees of freedom, rotational superradiance can trigger an instability that spins down black holes. This leads to peculiar gravitational-wave signatures and distribution in the spin-mass plane, which in turn can impose stringent constraints on ultralight fields. [...]
arXiv:1704.06151; CERN-TH-2017-082.-
2017-06-30 - 13 p.
- Published in : Phys. Rev. D 95 (2017) 124056
APS Open Access Article: PDF; Fulltext: 10.1103_PhysRevD.95.124056 - PDF; arXiv:1704.06151 - PDF;
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Anisotropic stars as ultracompact objects in General Relativity
/ Raposo, Guilherme (Rome U. ; INFN, Rome) ; Pani, Paolo (INFN, Rome) ; Bezares, Miguel (U. Iles Balears, Palma ; Barcelona, IEEC) ; Palenzuela, Carlos (Barcelona, IEEC) ; Cardoso, Vitor (Lisbon, CENTRA ; CERN)
Anisotropic stresses are ubiquitous in nature, but their modeling in General Relativity is poorly understood and frame dependent. We introduce the first study on the dynamical properties of anisotropic self-gravitating fluids in a covariant framework. [...]
arXiv:1811.07917.-
2019-05-28 - 9 p.
- Published in : Phys. Rev. D 99 (2019) 104072
Fulltext: PDF; Fulltext from Publisher: PDF;
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