تقرير
Thermodynamics inconsistencies in cosmological unimodular gravity models
| العنوان: | Thermodynamics inconsistencies in cosmological unimodular gravity models |
|---|---|
| المؤلفون: | Cruz, Miguel, Cruz, Norman, Lepe, Samuel |
| سنة النشر: | 2024 |
| المجموعة: | General Relativity and Quantum Cosmology |
| مصطلحات موضوعية: | General Relativity and Quantum Cosmology |
| الوصف: | In this work we study the thermodynamics of a cosmological unimodular gravity model at late times by considering two different energy diffusion functions that emerges in these scenarios, and that encodes the current for the non-conservation of the energy-momentum tensor, usually termed as $Q(t)$. Specifically, we discuss the barotropic and the continuous spontaneous localization models as energy diffusion functions. The consistency conditions demanded for the entropy of the system in terms of the cosmological parameters of the model: positive production ($dS/dt>0$) and convexity condition ($d^{2}S/dt^{2} <0$), are investigated. We show that these conditions strongly constraint the viavility of these models. Additionally, we comment about our results and compare with those obtained in recent works where the restriction of the parameters for these two diffusion models was implemented with the use of cosmological data. Comment: 8 pages, no figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2407.15207 |
| رقم الأكسشن: | edsarx.2407.15207 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |