Semiclassical Gravity Beyond General Relativity: Insights from Torsion
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908851585941504 |
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| author | Morales-Cabrera, R. Bonder, Y. |
| author_facet | Morales-Cabrera, R. Bonder, Y. |
| contents | We develop a semiclassical theory of modified gravity with nontrivial spacetime torsion. In particular, we show that the semiclassical treatment can be axiomatized in the case of Einstein--Cartan theory with a nonminimally coupled, free Klein--Gordon field, in four dimensions. Using Hadamard renormalization, we obtain well-defined expectation values for both, the energy--momentum and spin--density operators. These objects exhibit scale and renormalization ambiguities; we identify the latter by constructing a renormalization Lagrangian in terms of differential forms, which are particularly well suited for this purpose. Furthermore, we analyze the conformal anomaly, which persists in the presence of torsion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_01684 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Semiclassical Gravity Beyond General Relativity: Insights from Torsion Morales-Cabrera, R. Bonder, Y. General Relativity and Quantum Cosmology We develop a semiclassical theory of modified gravity with nontrivial spacetime torsion. In particular, we show that the semiclassical treatment can be axiomatized in the case of Einstein--Cartan theory with a nonminimally coupled, free Klein--Gordon field, in four dimensions. Using Hadamard renormalization, we obtain well-defined expectation values for both, the energy--momentum and spin--density operators. These objects exhibit scale and renormalization ambiguities; we identify the latter by constructing a renormalization Lagrangian in terms of differential forms, which are particularly well suited for this purpose. Furthermore, we analyze the conformal anomaly, which persists in the presence of torsion. |
| title | Semiclassical Gravity Beyond General Relativity: Insights from Torsion |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2511.01684 |