Электронный каталог

Статья

Goray, M.
Spinor-Field Realization of Modified Chaplygin Gas Dark Energy in FLRW Cosmology and Observational Constraints / M.Goray, B.Saha. – Text : electronic // Nuclear Physics B. – 2026. – Vol. 1027. – P. 117468. – URL: https://doi.org/10.1016/j.nuclphysb.2026.117468. – Bibliogr.: 51.

This work investigates a nonlinear spinor field unified dark energy model in a spherically symmetric Friedmann–Lemaître–Robertson–Walker (FLRW) spacetime, where the spinor self-interaction naturally reproduces a Modified Chaplygin Gas (MCG) equation of state. Unlike scalar-field or *LCDM models, the spinor field generates non-diagonal components of the energy–momentum tensor as a consequence of spacetime geometry, providing new insight into the coupling between spinor dynamics and cosmic expansion. We confront the model with recent late-time observations, including cosmic chronometer measurements of 𝐻(𝑧), Type Ia supernovae from the Pantheon+ compilation, and baryon acoustic oscillations (DESI DR2). A Markov Chain Monte Carlo analysis yields tight constraints on the model parameters, with a best-fit Hubble constant H&sub(0) *= 67.78 km s&sup(−1) Mpc&sup(−1) . The model reproduces late-time cosmic acceleration with a present-day deceleration parameter q(0) *= −0.493 and yields information criteria values that are competitive with ΛCDM. These results demonstrate that the spinor-field realization of MCG provides a viable and geometrically enriched alternative to standard dark energy scenarios.



Спец.(статьи,препринты) = С 322.2 - Космология. Гравитационные волны
Спец.(статьи,препринты) = С 324.2 - Нелокальные и нелинейные теории поля. Теории с высшими производными. Теории с индефинитной метрикой. Квантовая теория протяженных объектов. Струны. Мембраны. Мешки$
ОИЯИ = ОИЯИ (JINR)2026