Theoretical Consistency and Observational Constraints on Entropic Cosmology
Abstract
Recent DESI DR2 results suggest that dark energy may evolve with time, which motivates a re-examination of entropic cosmology. In this work, we study three representative entropic models, denoted as Models A, B, and C, corresponding to the driving terms H2, H2+Ḣ, and H2+Ḣ+H4, respectively. We establish a general framework for entropic cosmology and examine these models through early universe consistency, the Trans-Planckian Censorship Conjecture (TCC), and the realization of Quintom-B crossing. We constrain these models using the Pantheon+ sample, DESI DR2 BAO measurements, and Planck 2018 CMB distance priors, and compare their fits to the data. For Model C, we adopt a first-order perturbative treatment in the full data analysis to maintain numerical stability in the presence of the higher-order term. We find that Model A is the simplest among the three models, but it is difficult to make it compatible with both early universe consistency and the TCC condition. Model B, which includes a derivative correction term, shows a small difference in the fit to observational data compared to Model A, and is more consistent with the theoretical constraints. Model C includes more correction terms, but does not provide a better fit to the data. The parameter region favored by observations does not fully overlap with that preferred by theoretical consistency, which suggests that entropic cosmology may require further development to achieve a self-consistent description across different cosmic epochs.
Versions
Related
- Gravitational Wave Propagation in K-essence Cosmology: Theory and Observational Constraints
- Kruglov-entropy cosmology from apparent-horizon thermodynamics: background dynamics and observational constraints
- Running Vacuum Cosmology in f(R,T) Gravity: Observational Constraints and Thermodynamic Analysis
- On entropic cosmology, late-time acceleration and the quantum bounce
- Entropic Chaplygin-Gas cosmology and late-universe tension diagnostics
BibTeX
@misc{ren2026theoretical,
title = {{Theoretical Consistency and Observational Constraints on Entropic Cosmology}},
author = {Yunliang Ren and Xiaofeng Yang and Xuwei Zhang and Shuangnan Chen and Yangjun Shi and Hoernisa Iminniyaza},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.40205},
eprint = {2610.40205},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.40205},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Theoretical Consistency and Observational Constraints on Entropic Cosmology
AU - Yunliang Ren
AU - Xiaofeng Yang
AU - Xuwei Zhang
AU - Shuangnan Chen
AU - Yangjun Shi
AU - Hoernisa Iminniyaza
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.40205
UR - https://arxiv.org/abs/2610.40205
AB - Recent DESI DR2 results suggest that dark energy may evolve with time, which motivates a re-examination of entropic cosmology. In this work, we study three representative entropic models, denoted as Models A, B, and C, corresponding to the driving terms H^2, H^2+Ḣ, and H^2+Ḣ+H^4, respectively. We establish a general framework for entropic cosmology and examine these models through early universe consistency, the Trans-Planckian Censorship Conjecture (TCC), and the realization of Quintom-B crossing. We constrain these models using the Pantheon+ sample, DESI DR2 BAO measurements, and Planck 2018 CMB distance priors, and compare their fits to the data. For Model C, we adopt a first-order perturbative treatment in the full data analysis to maintain numerical stability in the presence of the higher-order term. We find that Model A is the simplest among the three models, but it is difficult to make it compatible with both early universe consistency and the TCC condition. Model B, which includes a derivative correction term, shows a small difference in the fit to observational data compared to Model A, and is more consistent with the theoretical constraints. Model C includes more correction terms, but does not provide a better fit to the data. The parameter region favored by observations does not fully overlap with that preferred by theoretical consistency, which suggests that entropic cosmology may require further development to achieve a self-consistent description across different cosmic epochs.
ER -