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19/12/2022, 16:30
We investigate general relativistic (GR) solutions in the Minimal Theory of Bigravity (MTBG). MTBG does not contain potentially problematic scalar and vector polarizations in the gravitational sectors and can be a promissing model for the origin of the cosmic acceleration of the present day. We show that a pair of Schwarzschild-de Sitter spacetimes written in the spatially-flat coordinates is...
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19/12/2022, 16:45
In the framework of Metric-Affine Gravity, the existing correspondence between the Einstein tensor and the energy-momentum tensor of matter provided by General Relativity is extended towards a post- Riemannian description in terms of the torsion and nonmetricity fields, which are sourced by the spin, dilation and shear currents of matter. In this talk, we discuss the dynamical role of the...
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19/12/2022, 17:00
After a brief description of what is a traversable wormhole we describe the connection between traversability, the Casimir effect and Yukawa deformations. With the help of an equation of state we also discuss other different solutions generated by the Casimir source. Speculations on these results are also presented including the effect of an additional electric charge.
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19/12/2022, 17:15
In this presentation we report on our study of the evolution in time of spherical excited scalar boson stars under the framework of General Relativity. We see that spherically symmetric excited scalar boson stars can be made dynamically stable (up to timescales of tμ ~ 10^4, where μ is the mass of the scalar particle) with a quartic self-interaction, for certain values of the self-interaction...
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19/12/2022, 17:30
Virial (a.k.a. scaling) identities are integral identities that are useful for a variety of purposes in non- linear field theories, including establishing no-go theorems for solitonic and black holes solutions as well as checking the accuracy of numerical solutions. In this presentation, we provide an algorithm for the derivation of such integral identities. We show that a complete treatment...
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19/12/2022, 17:45
In the present work, we investigate the consequences of running gravitational coupling on the properties of the three-dimensional BTZ black hole. We take as starting point the functional form of gravitational coupling obtained in the context of asymptotic safe gravity theory. By using the standard scale setting relation where k ∼ ξ / r^n, we compute the solution of the Einstein field...
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