Implications of Raychaudhuri equation and geodesic focusing in interacting two fluid systems Madhukrishna Chakraborty and Subenoy Chakraborty Eur. Phys. J. C, 85 1 (2025) 114 Published online: 30 January 2025 DOI: 10.1140/epjc/s10052-025-13850-6