Spinor field dark energy in FLRW space-time

Laboratory of Information Technologies

Joint Laboratory Seminar

Date and Time: Wednesday, 3 December 2025, at 11:00 AM

Venue: room 310, Meshcheryakov Laboratory of Information Technologies, online on Webinar

Link to join the seminar

1. Seminar topic: “Spinor field dark energy in FLRW space-time: Theory and observation”

   Speaker: Bijan Saha

   Authors: Bijan Saha, Mahendra Goray

   Abstract:
   

   This study explores the cosmological parameters within the framework of a spherically symmetric Friedmann-Lemaître-Robertson-Walker (FLRW) cosmological model, focusing on the influence of a nonlinear spinor field on the evolution of the universe. To validate this approach, researchers utilise recent data from Cosmic Chronometers, Supernovae, and the Sloan Digital Sky Survey.
   
   Our findings indicate that in spherical coordinates, the FLRW model reveals the energy-momentum tensor (EMT) of the spinor field to have nontrivial non-diagonal components. Notably, these non-diagonal components of the EMT are independent of the nonlinear characteristics of the spinor field and the parameter k, which defines the type of curvature in the FLRW model.
   
   Based on this framework, we develop a dark energy model and perform a Markov Chain Monte Carlo (MCMC) simulation to obtain the best-fit values for the parameters. The results align well with the current Hubble parameter and deceleration parameter, suggesting that the universe is undergoing accelerated expansion.




2. Seminar topic: “Report on scientific activities in the period 2020–2025”

   Speaker: Genis Musulmanbekov

   Abstract:
   

   • Participation in the BM@N, SRC, and MPD Collaborations
   • Participation in the development of modification of the DCM-QGSM incorporating the statistical multifragmentation mechanism (SMM).
   • Modeling and analysis of proton-nucleus and nucleus-nucleus collisions for the BM@N, SRC, and MPD Experiments
   • Development of the quark model of nuclear structure (SCQM).