Einstein-Grisaru-Zanon gravity
| Autor: | Delgado, Ruben Campos, Ketov, Sergei V. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Physics Letters B 855 (2024) 138811 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physletb.2024.138811 |
| Popis: | The leading $(\alpha')^3$-correction to the gravitational low-energy effective action of closed (type II) superstring theory in four-spacetime dimensions defines the Einstein-Grisaru-Zanon gravity action that is applied for a calculation of the leading corrections to the Schwarzschild solution and the Hubble function in the Friedmann-Lemaitre-Robertson-Walker universe, in the first order with respect to the effective string-generated coupling. The solutions found are compared to the corresponding solutions in the Einstein-Bel-Robinson gravity that also modifies the Einstein gravity by the terms quartic in the spacetime curvature. We consider the black hole shadows in the Einstein-Grisaru-Zanon gravity theory and derive the upper bound on the string coupling parameter from the Hawking temperature of a black hole. Comment: 10 pages, no figures, LaTeX; references added |
| Databáze: | arXiv |
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