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29/06/2026, 13:30
We investigate static, spherically symmetric black holes in regularised four-dimensional Einstein–scalar–Gauss–Bonnet gravity, with the aim of determining whether the theory admits non-asymptotically flat solutions beyond the known special cases. Working in standard spherical coordinates, we use a Frobenius-type expansion of the symmetry-reduced field equations to classify possible local...
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29/06/2026, 13:55
I will talk about static spacetimes that are spherically symmetric in three space dimensions, and have also n extra dimensions with Euclidean symmetry. I show that a specific ansatz leads to a limited set of vacuum solutions of the Einstein field equations, which can also be classified as Weyl solutions. I will talk about properties of these spacetimes investigated through the Kretschmann...
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29/06/2026, 14:20
Resonant excitations during inflation can amplify the primordial curvature perturbation within a narrow range of k values. This suggests a novel mechanism to generate Primordial Black Holes (PBHs). We study such resonances within the context of the Running-Mass-Inflation model. Generated PBHs can explain the totality of Dark Matter. The mechanism also predicts enhanced induced Gravitational...
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29/06/2026, 14:45
We investigate the phase structures of Lorentzian Dyonic Taub-NUT-AdS spacetimes with spherical, flat, and hyperbolic horizon geometries. First, we construct a consistent approach for the thermodynamics of these solution, which is verified through the first law, the Gibbs-Duhem relation, and the generalized Smarr relation. Second, to analyze these phases we consider both canonical and mixed...
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