Realisations of type III stress-energy tensors of the Hawking-Ellis classification in scalar-tensor gravity
Autor: | Banerjee, Narayan, Faraoni, Valerio, Vanderwee, Robert, Giusti, Andrea |
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Rok vydání: | 2023 |
Předmět: | |
Druh dokumentu: | Working Paper |
Popis: | The ``ugly duckling'' of the Segr\'e-Pleba\'nski-Hawking-Ellis classification of stress-energy tensors is believed to be either impossible or extremely difficult to realise in Einstein gravity. Effective stress-energy tensors in alternative gravity offer a wider range of possibilities. We report a class of type III realisations in ``first-generation'' scalar-tensor and in Horndeski gravity, and their physical interpretation. The ugly duckling may be a freak of nature of limited importance but it is not physically impossible. Comment: Added explanation and an appendix, bibliography expanded. Matches version to appear in Phys. Rev. D |
Databáze: | arXiv |
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