Speaker
Valerio Faraoni
Description
In General Relativity, the ``ugly duckling'' of the Segre-Plebanski-Hawking-Ellis classification of stress-energy tensors (type III) is very difficult (and was believed to be impossible) to realise. Effective stress-energy tensors in alternative gravity cover a wider range of possibilities. We report a class of type III realisations in first-generation scalar-tensor and in Horndeski gravity, together with their physical interpretation. The ugly duckling may be a freak of nature of limited importance but it is not physically impossible.
[Based on N. Banerjee, V. Faraoni, R. Vanderwee, A. Giusti 2023, Phys. Rev. D 108, 084047 (arXiv:2307.13846)]
| Keyword-1 | Type III stress energy tensor |
|---|---|
| Keyword-2 | General Relativity |
| Keyword-3 | Horndeski gravity |
Primary author
Valerio Faraoni
