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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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(91)

Type-I Seesaw with eV-Scale Neutrinos / Branco, G.C. (Lisbon, CFTP) ; Penedo, J.T. (Lisbon, CFTP) ; Pereira, Pedro M.F. (Lisbon, CFTP) ; Rebelo, M.N. (Lisbon, CFTP ; CERN) ; Silva-Marcos, J.I. (Lisbon, CFTP)
We consider seesaw type-I models including at least one (mostly-)sterile neutrino with mass at the eV scale. Three distinct situations are found, where the presence of light extra neutrinos is naturally justified by an approximately conserved lepton number symmetry. [...]
arXiv:1912.05875.- 2020-07-23 - 43 p. - Published in : JHEP 2007 (2020) 164 Article from SCOAP3: PDF; Fulltext: PDF;

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(80)

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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(76)

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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(74)

Domain Collisions / Bea, Yago (CERN ; Helsinki U.) ; Casalderrey-Solana, Jorge (Barcelona U.) ; Giannakopoulos, Thanasis (Lisbon U.) ; Mateos, David (Barcelona U. ; ICREA, Barcelona) ; Sanchez-Garitaonandia, Mikel (Barcelona U.) ; Zilhão, Miguel (Lisbon U.)
We use holography to study collisions of phase domains formed in a four-dimensional, strongly-coupled gauge theory with a first-order, thermal phase transition. [...]
arXiv:2111.03355 ; HIP-2021-34/TH. - 25 p.
Fulltext

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(74)

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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(65)

Path-sum calculations for rf current drive / Belo, Jorge H (Centro de Fusão Nuclear, Associação Euratom-IST, Instituto Superior Técnico, 1049-001 Lisboa, Portugal) ; Bizarro, Joao P S (Centro de Fusão Nuclear, Associação Euratom-IST, Instituto Superior Técnico, 1049-001 Lisboa, Portugal) ; Rodrigues, Paulo (Centro de Fusão Nuclear, Associação Euratom-IST, Instituto Superior Técnico, 1049-001 Lisboa, Portugal)
2001 - Published in : AIP Conf. Proc. 595 (2001) 442-445
In : Conference on Radio Frequency Power in Plasmas, Oxnard, CA, USA, 7 - 9 May 2001, pp.442-445

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(64)

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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(61)

Fokker-Planck calculations in nonuniform grids for rf current drive / Rodrigues, Paulo (Centro de Fusão Nuclear, Associação Euratom-IST, Instituto Superior Técnico, 1049-001 Lisboa, Portugal) ; Bizarro, Joao P S (Centro de Fusão Nuclear, Associação Euratom-IST, Instituto Superior Técnico, 1049-001 Lisboa, Portugal)
2001 - Published in : AIP Conf. Proc. 595 (2001) 446-449
In : Conference on Radio Frequency Power in Plasmas, Oxnard, CA, USA, 7 - 9 May 2001, pp.446-449

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(60)

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. - 46 p.
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