Torsional four-fermion interaction and the Raychaudhuri equation Shibendu Gupta Choudhury, Sagar Kumar Maity and Amitabha Lahiri Eur. Phys. J. C, 84 12 (2024) 1304 Published online: 20 December 2024 DOI: 10.1140/epjc/s10052-024-13618-4