Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Della Monica, Riccardo"'
The Parameterized Post-Newtonian (PPN) formalism offers an agnostic framework for evaluating theories of gravity that extend beyond General Relativity. Departures from General Relativity are represented by a set of dimensionless parameters that, at t
Externí odkaz:
http://arxiv.org/abs/2410.22864
Fuzzy Dark Matter (FDM) is among the most suitable candidates to replace WIMPs and to resolve the puzzling mystery of dark matter. A galactic dark matter halo made of these ultralight bosonic particles leads to the formation of a solitonic core surro
Externí odkaz:
http://arxiv.org/abs/2410.18659
We consider a static, spherically symmetric space-time with an electric field arising from a quadratic metric-affine extension of General Relativity. Such a space-time is free of singularities in the centre of the black holes, while at large distance
Externí odkaz:
http://arxiv.org/abs/2311.08031
We investigate whether the oblate, spheroidal morphology of common dwarf spheroidal galaxies (dSph) may result from the slow relaxation of stellar orbits within a halo of Wave Dark Matter ($\psi$DM) when starting from an initial disk of stars. Stella
Externí odkaz:
http://arxiv.org/abs/2308.14664
We derive new constraints on the dilaton parameter appearing in the spherically-symmetric black hole solution of Einstein-Maxwell-dilaton-axion gravity, by studying the geodesic motion of the S2 star in the Galactic Center. Einstein-Maxwell-dilaton-a
Externí odkaz:
http://arxiv.org/abs/2306.06937
We developed a numerical methodology to compute the fully-relativistic propagation time of photons emitted by a pulsar in orbit around a massive compact object, like the supermassive black hole Sagittarius A* in the Galactic Center, whose gravitation
Externí odkaz:
http://arxiv.org/abs/2305.18178
Publikováno v:
Phys. Rev. D 108, L101303 (2023)
Dark matter is undoubtedly one of the fundamental, albeit unknown, components of the standard cosmological model. The failure to detect WIMPs, the most promising candidate particle for cold dark matter, actually opens the way for the exploration of v
Externí odkaz:
http://arxiv.org/abs/2305.10242
The explicit derivation for the orbital precession of the S2 star in the Galactic Center in the Scalar-Tensor-Vector Gravity is discussed and compared with previous research. The two different predictions are validated by numerically integrating the
Externí odkaz:
http://arxiv.org/abs/2302.12296
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 519, Issue 2, pp.1981-1988
We have explored a completely new and alternative way to restrict the parameter space of Horndeski theory of gravity. Using its Newtonian limit, it is possible to test the theory at a regime where, given its complexity and the small magnitude of the
Externí odkaz:
http://arxiv.org/abs/2212.05082
Publikováno v:
Rep. Prog. Phys. 86 104901 (2023)
The Galactic Center of the Milky Way, thanks to its proximity, allows to perform astronomical observations that investigate physical phenomena at the edge of astrophysics and fundamental physics. As such, it offers a unique laboratory to probe gravit
Externí odkaz:
http://arxiv.org/abs/2211.07008