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Moving black holes: energy extraction, absorption cross-section and the ring of fire / Cardoso, Vitor (Lisbon, CENTRA ; CERN) ; Vicente, Rodrigo (Lisbon, CENTRA)
We consider the interaction between a plane wave and a (counter-moving) black hole. We show that energy is transferred from the black hole to the wave, giving rise to a negative absorption cross-section. [...]
arXiv:1906.10140.- 2019-10-02 - 6 p. - Published in : Phys. Rev. D 100 (2019) 084001 Fulltext: PDF; Fulltext from Publisher: PDF;

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(91)

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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(89)

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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(47)

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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(32)

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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(28)

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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(26)

Strong Cosmic Censorship: the nonlinear story / Luna, Raimon (ICC, Barcelona U.) ; Zilhão, Miguel (Lisbon, CENTRA ; CERN) ; Cardoso, Vitor (Lisbon, CENTRA) ; Costa, João L. (ISCTE, Lisbon ; U. Lisbon (main)) ; Natário, José (IST, Lisbon (main))
A satisfactory formulation of the laws of physics entails that the future evolution of a physical system should be determined from appropriate initial conditions. The existence of Cauchy horizons in solutions of the Einstein field equations is therefore problematic, and expected to be an unstable artifact of General Relativity. [...]
arXiv:1810.00886; arXiv:2012.08413.- 2019-03-16 - 9 p. Fulltext: PDF; Fulltext from Publisher: PDF; External links: 00001 Mass function~\eqref{eq:mass} and Kretschmann scalar as functions of $\overset{\circ}{v}$ for configurations {\bf B1} (red solid line) and {\bf B2} (blue dashed line). Thin lines are evaluated at $u=u_{\rm EH} + 1$ and thick lines are evaluated at $u=u_{\rm EH} + 2$.; 00000 Scalar field derivative $\partial \Phi /\partial \overset{\circ}{v}$ as a function of $\overset{\circ}{v}$ for configurations {\bf A} (left plot), {\bf B} (middle plot), {\bf C} (right plot) with initial profiles 1 (red solid lines) and 2 (blue dashed lines). $\partial \Phi /\partial \overset{\circ}{v}$ evaluated at $u=u_{\rm EH}$.; 00011 Same as Fig.~\ref{fig:no_inflation}, for configurations {\bf C1} (red solid) and {\bf C2} (blue dashed).; 00007 Mass function~\eqref{eq:mass} and Kretschmann scalar as functions of $\overset{\circ}{v}$ for configurations {\bf A1} (red solid line) and {\bf A2} (blue dashed line). Thin lines are evaluated at $u=u_{\rm EH} + 1$ and thick lines are evaluated at $u=u_{\rm EH} + 2$. These results are consistent with the existence of mass inflation leading to a weak singularity.; 00005 Constraint violations during our evolutions of configurations {\bf B}.; 00004 Constraint violations during our evolutions of configurations {\bf B}.; 00006 Radius function for constant-$u$ slices in a configuration with $M_0 = 1.0$, $Q = 0.9$, $\Lambda = 0.06$, $\mu = 0$, $A = 0.4$, $v_c = 3.0$ and $w = 0.25$. Dashed-dotted green lines reach infinity, full blue lines hit the CH and red dashed lines hit the singularity at $r=0$.; 00010 Massless scalar field along the event horizon with corresponding ``local power'' for a configuration with $M_0 = 1.0$, $Q = 0.95$, $\Lambda = 0$, $\mu = 0$, $A = 0.01$, $v_c = 6.0$ and $w = 0.25$. The power-law decay $\Phi \sim v^{-3}$ matches to a very good precision the one expected from linearized analysis~\cite{Price:1971fb}, and reproduces well previous nonlinear results~\cite{Burko:1997tb}.; 00002 Massless scalar field along the event horizon with corresponding ``local power'' for a configuration with $M_0 = 1.0$, $Q = 0.95$, $\Lambda = 0$, $\mu = 0$, $A = 0.01$, $v_c = 6.0$ and $w = 0.25$. The power-law decay $\Phi \sim v^{-3}$ matches to a very good precision the one expected from linearized analysis~\cite{Price:1971fb}, and reproduces well previous nonlinear results~\cite{Burko:1997tb}.; Fulltext from Publisher; 00003 $\delta_{N,64} (K)$ at $u=18.2$ for configuration {\bf B1}. 20 domains were employed in the $v$ direction, where each domain has $N$ points. The plot clearly shows exponential convergence until $N\approx40$.; Fulltext; 00008 Scalar field derivative $\partial \Phi /\partial \overset{\circ}{v}$ as a function of $\overset{\circ}{v}$ for configurations {\bf A} (left plot), {\bf B} (middle plot), {\bf C} (right plot) with initial profiles 1 (red solid lines) and 2 (blue dashed lines). $\partial \Phi /\partial \overset{\circ}{v}$ evaluated at $u=u_{\rm EH}$.; 00009 Scalar field derivative $\partial \Phi /\partial \overset{\circ}{v}$ as a function of $\overset{\circ}{v}$ for configurations {\bf A} (left plot), {\bf B} (middle plot), {\bf C} (right plot) with initial profiles 1 (red solid lines) and 2 (blue dashed lines). $\partial \Phi /\partial \overset{\circ}{v}$ evaluated at $u=u_{\rm EH}$.

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(25)

Parametrized black hole quasinormal ringdown: Decoupled equations for nonrotating black holes / Cardoso, Vitor (IST, Lisbon (main) ; CERN) ; Kimura, Masashi (IST, Lisbon (main) ; Rikkyo U.) ; Maselli, Andrea (U. Rome La Sapienza (main) ; INFN, Rome) ; Berti, Emanuele (Johns Hopkins U. (main)) ; Macedo, Caio F.B. (Para U.) ; McManus, Ryan (Johns Hopkins U. (main))
Black hole solutions in general relativity are simple. The frequency spectrum of linear perturbations around these solutions (i.e., the quasinormal modes) is also simple, and therefore it is a prime target for fundamental tests of black hole spacetimes and of the underlying theory of gravity. [...]
arXiv:1901.01265.- 2019-05-29 - 11 p. - Published in : Phys. Rev. D 99 (2019) 104077 Fulltext: PDF; Fulltext from Publisher: PDF;

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Electromagnetism and hidden vector fields in modified gravity theories: spontaneous and induced vectorization / Annulli, Lorenzo (Lisbon, CENTRA) ; Cardoso, Vitor (Lisbon, CENTRA ; CERN) ; Gualtieri, Leonardo (INFN, Rome ; Rome U.)
In general relativity, Maxwell's equations are embedded in curved spacetime through the minimal prescription, but this could change if strong-gravity modifications are present. We show that with a nonminimal coupling between gravity and a massless vector field, nonperturbative effects can arise in compact stars. [...]
arXiv:1901.02461.- 2019-02-20 - 12 p. - Published in : Phys. Rev. D 99 (2019) 044038 Fulltext: PDF; Fulltext from Publisher: PDF;

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