Stealth configurations in vector-tensor theories of gravity
| Autor: | Gianmassimo Tasinato, Javier Chagoya |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
High Energy Physics - Theory Gravity (chemistry) 010308 nuclear & particles physics General relativity Degrees of freedom (statistics) FOS: Physical sciences Astronomy and Astrophysics General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences Alternatives to general relativity General Relativity and Quantum Cosmology Black hole Theoretical physics High Energy Physics - Theory (hep-th) 0103 physical sciences Vector field Tensor Gauge theory 010306 general physics |
| DOI: | 10.48550/arxiv.1707.07951 |
| Popis: | Studying the physics of compact objects in modified theories of gravity is important for understanding how future observations can test alternatives to General Relativity. We consider a subset of vector-tensor Galileon theories of gravity characterized by new symmetries, which can prevent the propagation of the vector longitudinal polarization, even in absence of Abelian gauge invariance. We investigate new spherically symmetric and slowly rotating solutions for these systems, including an arbitrary matter Lagrangian. We show that, under certain conditions, there always exist stealth configurations whose geometry coincides with solutions of Einstein gravity coupled with the additional matter. Such solutions have a non-trivial profile for the vector field, characterized by independent integration constants, which extends to asymptotic infinity. We interpret our findings in terms of the symmetries and features of the original vector-tensor action, and on the number of degrees of freedom that it propagates. These results are important to eventually describe gravitationally bound configurations in modified theories of gravity, such as black holes and neutron stars, including realistic matter fields forming or surrounding the object. Comment: 20 pages, 3 figures |
| Databáze: | OpenAIRE |
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