Shadows of charged rotating black holes: Kerr-Newman versus Kerr-Sen
| Autor: | Pedro V. P. Cunha, Luís C. B. Crispino, Carlos A. R. Herdeiro, Sérgio Vinicius Monteiro C. B. Xavier |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Event Horizon Telescope
Physics Heterotic string theory Black holes 010308 nuclear & particles physics General relativity Physics beyond the Standard Model Strong gravitational lensing FOS: Physical sciences Astronomy and Astrophysics General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences General Relativity and Quantum Cosmology Theoretical physics Gravitational field Space and Planetary Science 0103 physical sciences Effective field theory Quantum gravity 010303 astronomy & astrophysics Mathematical Physics Shadows |
| Zdroj: | International Journal of Modern Physics D Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | Celebrating the centennial of its first experimental test, the theory of General Relativity (GR) has successfully and consistently passed all subsequent tests with flying colours. It is expected, however, that at certain scales new physics, in particular in the form of quantum corrections, will emerge, changing some of the predictions of GR, which is a classical theory. In this respect, black holes (BHs) are natural configurations to explore the quantum effects on strong gravitational fields. BH solutions in the low-energy effective field theory description of the heterotic string theory, which is one of the leading candidates to describe quantum gravity, have been the focus of many studies in the last three decades. The recent interest in strong gravitational lensing by BHs, in the wake of the Event Horizon Telescope observations, suggests comparing the BH lensing in both GR and heterotic string theory, in order to assess the phenomenological differences between these models. In this work, we investigate the differences in the shadows of two charged BH solutions with rotation: one arising in the context of GR, namely the Kerr-Newman solution, and the other within the context of low-energy heterotic string theory, the Kerr-Sen solution. We show and interpret, in particular, that the stringy BH always has a larger shadow, for the same physical parameters and observation conditions. 11 pages, 11 figures, Contribution to Selected Papers of the Fifth Amazonian Symposium on Physics, v2: references added, v3: typos corrected, matches published version |
| Databáze: | OpenAIRE |
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