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Ovcharenko, Hryhorii (Charles University, Faculty of Mathematics and Physics, Institute of Theoretical Physics, V Holesovickach 2, 18000 Prague 8, Czechia)
We present a large family of twisting and expanding solutions to the Einstein-Maxwell equations of algebraic type D, for which the two double principal null directions (PNDs) of the Weyl tensor are not aligned with the null eigendirections of the Faraday tensor. In addition to systematically deriving this new class, we present its various metric forms and convenient parameterizations. We show...
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Omarouayache, Amin (University of Sheffield)
We present a unified geometric framework for hidden
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symmetries in the broad class of Conformal St\"{a}ckel Spacetimes. While the
analytic separability of the Hamilton-Jacobi equation is well-established for
specific metrics, the geometric origin of the associated Conformal
Killing-St\"{a}ckel tensors has remained obscured by the limitations of standard
Killing-Yano theory, which often... -
Riahi, Natascha (Universität Wien)
Unimodular quantum cosmology results in a Schrödinger-like equation that governs the dynamics of the wave function of the universe.
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The explicit time dependence makes it possible to compare directly and independently the dynamics of the expectation values of the scale factor, the Hubble parameter and the matter density with their classical counterparts. We construct wave packet solutions... -
Vicente-Cano, Aitor (ICCUB - University of Barcelona)
It has recently been shown that the Schwarzschild singularity is generically resolved by the introduction of infinite towers of higher-curvature corrections to the Einstein-Hilbert action. In such theories, matter collapse leads to the formation of regular black holes. In my talk, I will present new results on spherically symmetric stars within this framework, showing how Buchdahl's...
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Estonba-Loinaz, Julen (EHU)
Domain walls arise in theories where a discrete symmetry is spontaneously broken, a mechanism that appears in a wide range of high-energy physics models and makes the formation of domain walls in the early Universe a well-motivated possibility. In this work, we study the evolution of domain wall networks by analysing their scaling regime, an attractor solution in which the network evolves...
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Martínez Lobo, Jhan Nicolás (Universidad Industrial de Santander)
Our purpose is to give a step forward in the search of nature's options to describe classical gravity. Two reasonable hypotheses are invoked: the spacetime is described by a smooth manifold, which might or might not be Riemannian, and the classical gravitational dynamics is intimately related to the laws of thermodynamics (Jacobson's programme). We have found that the Einstein-Hilbert's...
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DEL VALLE CALZADA, PELAYO (Departamento de Física, Universidad de Alicante)
We develop a statistical framework for logarithmic corrections to black-hole entropy by modeling the horizon as a collection of $N$ identical, non-interacting quantum regions, each carrying a finite set of commuting discrete observables. For fixed collective observables, the horizon is described microcanonically, and a statistical analysis yields
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$$
S_{\mathrm{micro}}(A)= \alpha\,... -
Martinez Donato, Izarne (Univesitat de València)
Nonlinear hyperbolic balance laws with stiff source terms arise in many multiphysics problems, including astrophysical flows where hydrodynamics is coupled with chemical processes. In this work we consider a system of hyperbolic balance laws describing a shock–cloud interaction with a simplified chemical network for ionisation and recombination. This framework is useful in studying the...
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Lovo, Thomas (SISSA)
Black hole perturbations in general relativity are typically governed by Heun-type differential equations, whose associated connection problem has remained largely unexplored for many years. Recent developments in 2D CFT, however, have led to partial progress on this long-standing issue, allowing for a more transparent treatment of the associated spectral problems, in particular the...
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López Oliver, Pau (Università di Genova & Universitat de València)
Quantum field theory predicts that dynamical curved spacetimes can spontaneously excite particle pairs from the quantum vacuum, a phenomenon extensively studied in expanding universes and in scenarios involving gravitational collapse. In this article, we explore particle creation driven by radial oscillations of 3+1-dimensional spherically symmetric compact objects, such as neutron stars,...
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Borgvall Gonzalez, Oskar (Instituto Superior Tecnico)
In string theory, a natural low energy effective action is the Einstein-Gauss-
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Bonnet gravity, in which a Gauss-Bonnet term accompanies the usual Einstein-
Hilbert action. Born-Infeld electrodynamics arises when considering an Abelian
gauge field coupled to the open bosonic string or open superstring. In this talk,
we analyze the superradiant behavior of a massive, charged scalar field... -
Martínez, Álvaro (Charles University-Institute of Theoretical Physics)
The \emph{classical double copy} is a correspondence between solutions of
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Yang--Mills theory and gravity that extends the color-kinematics duality,
originally discovered in the context of scattering amplitudes, to fully
classical field configurations.
Its most familiar exact realization is the Kerr--Schild double copy, which
identifies the Schwarzschild black hole as the gravitational...
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