Ghosh, SnigdhaSnigdhaGhoshSarkar, SouravSouravSarkarMitra, SukanyaSukanyaMitra2025-08-302025-08-302017-03-0110.1103/PhysRevD.95.0560102-s2.0-85019863315https://d8.irins.org/handle/IITG2025/22523The self-energy of the Δ baryon is evaluated at a finite temperature and density using the real-time formalism of thermal field theory. The Dyson-Schwinger equation is used to get the exact thermal propagator followed by the spectral function of Δ. The πN scattering cross section obtained using an explicit Δ exchange is normalized to the experimental data in the vacuum, and its medium modification is implemented by means of the exact thermal propagator. A significant suppression of the peak of the cross section is observed at a higher temperature and baryon density. Effects on the mean relaxation time of nucleons and the temperature dependence of the shear viscosity of a pion nucleon gas are demonstrated.falseReviewhttps://arxiv.org/pdf/1603.0669924700029March 20178058701reJournal10