Dynamical stability and observational constraints on a late-time dark-matter particle-creation model
Abstract
We investigate the cosmological dynamics of gravitational particle creation in a spatially flat FLRW Universe comprising radiation, baryons, dark matter (DM), and a separately conserved dark-energy component. The DM sector is described as an effective open thermodynamic fluid incorporating intrinsic pressure and particle-creation-induced negative pressure. Introducing the compact variable u=H0/(H0+H), we construct a four-dimensional autonomous system and systematically investigate its critical points, dynamical stability, and physical admissibility. The model is constrained using three observational combinations: PPS+BAO+OHD, Union3+BAO+OHD, and DES-DOV+BAO+OHD. The observationally preferred parameter regions exclude the nontrivial DM-dominated de Sitter-like branches from the physical phase space, while identifying a stable, physically admissible, dark-energy-dominated accelerating attractor. The reconstructed cosmological evolution consistently reproduces the radiation--matter--acceleration sequence, with a transition redshift ztr≃0.71--$0.73$. Posterior-level analysis reveals that approximately 92%--97% of the samples support this accelerating attractor. The asymptotic evolution approaches a quintessence-like power-law expansion with H→0, rather than a de Sitter state. These findings establish a connection between observational constraints, gravitational particle creation, and the global dynamical structure governing the distant cosmic future.
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BibTeX
@misc{chatterjee2026dynamical,
title = {{Dynamical stability and observational constraints on a late-time dark-matter particle-creation model}},
author = {Anirban Chatterjee},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.18531},
eprint = {2610.18531},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.18531},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Dynamical stability and observational constraints on a late-time dark-matter particle-creation model
AU - Anirban Chatterjee
PY - 2026
DA - 2026/10/13
PB - arXiv
DO - 10.48550/arxiv.2610.18531
UR - https://arxiv.org/abs/2610.18531
AB - We investigate the cosmological dynamics of gravitational particle creation in a spatially flat FLRW Universe comprising radiation, baryons, dark matter (DM), and a separately conserved dark-energy component. The DM sector is described as an effective open thermodynamic fluid incorporating intrinsic pressure and particle-creation-induced negative pressure. Introducing the compact variable u=H_0/(H_0+H), we construct a four-dimensional autonomous system and systematically investigate its critical points, dynamical stability, and physical admissibility. The model is constrained using three observational combinations: PPS+BAO+OHD, Union3+BAO+OHD, and DES-DOV+BAO+OHD. The observationally preferred parameter regions exclude the nontrivial DM-dominated de Sitter-like branches from the physical phase space, while identifying a stable, physically admissible, dark-energy-dominated accelerating attractor. The reconstructed cosmological evolution consistently reproduces the radiation--matter--acceleration sequence, with a transition redshift z_tr≃0.71--$0.73$. Posterior-level analysis reveals that approximately 92%--97% of the samples support this accelerating attractor. The asymptotic evolution approaches a quintessence-like power-law expansion with H→0, rather than a de Sitter state. These findings establish a connection between observational constraints, gravitational particle creation, and the global dynamical structure governing the distant cosmic future.
ER -