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3 giorni fa · On 29 May 2023, the LIGO Livingston observatory detected the gravitational-wave signal GW230529_181500 from the merger of a neutron star with a lower mass-gap compact object. Its long inspiral signal provides a unique opportunity to test General Relativity (GR) in a parameter space previously unexplored by strong-field tests. In this work, we performed parameterized inspiral tests of GR with ...
4 giorni fa · View PDF HTML (experimental) Abstract: We review the solution space for the field equations of Einstein's General Relativity for various static, spherically symmetric spacetimes. We consider the vacuum case, represented by the Schwarzschild black hole; the de Sitter-Schwarzschild geometry, which includes a cosmological constant; the Reissner-Nordström geometry, which accounts for the presence ...
5 giorni fa · For example, general relativity teaches us to understand the macroscopic motion of stars by looking at the geometry of spacetime, leading to striking discoveries such as black holes.
1 giorno fa · It modifies general relativity with high-order terms universally generated within quantum gravity at the one-loop level [17–19]. We found another example of an extremely simple model consistent with the observational data. The model describes general relativity with a single massive scalar field minimally coupled to gravity.
4 giorni fa · Abstract: We review the solution space for the field equations of Einstein's General Relativity for various static, spherically symmetric spacetimes. We consider the vacuum case, represented by the Schwarzschild black hole; the de Sitter-Schwarzschild geometry, which includes a cosmological constant; the Reissner-Nordstr\"{o}m geometry, which accounts for the presence of charge.
2 giorni fa · Subjects: General Relativity and Quantum Cosmology (gr-qc) Gravitational-wave signals detected to date are commonly interpreted under the paradigm that they originate from pairs of black holes or neutron stars. Here, we explore the alternative scenario of boson-star signals being present in the data stream.
4 giorni fa · The relativistic Lagrangian can be derived in relativistic mechanics to be of the form: Although, unlike non-relativistic mechanics, the relativistic Lagrangian is not expressed as difference of kinetic energy with potential energy, the relativistic Hamiltonian corresponds to total energy in a similar manner but without including rest energy.
