| Autor: |
Waleed El Hanafy |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
European Physical Journal C: Particles and Fields, Vol 84, Iss 4, Pp 1-22 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1434-6052 |
| DOI: |
10.1140/epjc/s10052-024-12713-w |
| Popis: |
Abstract Similar to Rastall gravity we introduce matter-geometry nonminimal coupling which is proportional to the gradient of quadratic curvature invariants. Those are mimicking the conformal trace anomaly when backreaction of the quantum fields to a curved spacetime geometry is considered. We consider a static spherically symmetric stellar structure with anisotropic fluid and Krori-Barua metric potentials model to examine the theory. Confronting the model with NICER + XMM-Newton observational constraints on the pulsar PSR J0740 $$+$$ + 6620 quantifies the amount of the nonminimal coupling via a dimensionless parameter $$\epsilon \simeq -0.01$$ ϵ ≃ - 0.01 . We verify that the conformal symmetry is broken everywhere inside the pulsar as the trace anomaly $$\varDelta >0$$ Δ > 0 , or equivalently the trace of the stress-energy tensor $${\mathfrak {T}} |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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