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SUMMARY:Contributory: Background and Perturbation Constraints on Spinor Fi
 eld Dark Energy from Recent Cosmological Observations
DTSTART;VALUE=DATE-TIME:20261116T070000Z
DTEND;VALUE=DATE-TIME:20261116T071500Z
DTSTAMP;VALUE=DATE-TIME:20261027T201503Z
UID:indico-contribution-975@indico.narit.or.th
DESCRIPTION:Speakers: Mahendra Goray (Dept. of Physics\, S.P College\, Sid
 o Kanhu Murmu University\, Dumka\, Jharkhand)\nWe investigate a nonlinear 
 self-interacting spinor field as a dynamical dark-energy candidate capable
  of driving the late-time accelerated expansion of the Universe. The model
  is formulated within a spatially flat Friedmann–Lemaître–Robertson
 –Walker framework\, where the spinor field is minimally coupled to gravi
 ty and generates an effective dark-energy equation of state through its se
 lf-interaction potential. We study both the background and perturbation dy
 namics of the model\, deriving the evolution of the Hubble parameter (H(z)
 )\, equation-of-state parameter (w(z))\, deceleration parameter (q(z))\, a
 nd the growth of matter density perturbations. The background parameters a
 re constrained through a Markov Chain Monte Carlo (MCMC) analysis using re
 cent observational datasets\, including cosmic chronometers\, Pantheon sup
 ernovae\, and baryon acoustic oscillation measurements. To assess the impa
 ct on structure formation\, we implement the model at the perturbation lev
 el and examine its predictions for the growth rate ($f\\sigma_8$(z))\, mat
 ter power spectrum\, and the evolution of density fluctuations. We find th
 at the spinor dark-energy scenario successfully reproduces the observed ex
 pansion history while remaining compatible with current large-scale struct
 ure measurements. The effective equation of state evolves dynamically and 
 approaches the cosmological-constant limit at late times\, while allowing 
 mild deviations at intermediate redshifts. Statistical model comparison sh
 ows that the spinor-field framework provides a viable and competitive alte
 rnative to the standard $\\Lambda$CDM cosmology\, motivating further inves
 tigation with forthcoming high-precision surveys such as DESI\, Euclid\, a
 nd Rubin Observatory.\n\nhttps://indico.narit.or.th/event/234/contribution
 s/975/
LOCATION:Pattaya\, Thailand D Varee Jomtien Beach Pattaya Hotel
URL:https://indico.narit.or.th/event/234/contributions/975/
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