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2 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 ...
3 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 ...
4 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.
21 ore 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.
3 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.
1 giorno 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.
3 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.
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