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hep-th2026
Near-Light-Cone Nonhydrodynamic Structure from Boosted Hydrodynamics
Navid Abbasi, Jewel Kumar Ghosh, Dirk H. Rischke
Hydrodynamics provides a universal description of many-body systems at long wavelengths. Its long-lived collective excitations, known as hydrodynamic modes, admit long-wavelength e…
hep-th2025
Comparison between Causal and Acausal Diffusion: a Schwinger-Keldysh Effective Field Theory Perspective
Navid Abbasi, Matthias Kaminski, Dirk H. Rischke
In Fick's time-honored theory of diffusion, the system responds instantaneously to external perturbations, resulting in acausal behavior. Maxwell-Cattaneo theory addresses this iss…
hep-th2025
Three-point functions from a Schwinger-Keldysh effective action, resummed in derivatives
Navid Abbasi, Dirk H. Rischke
The search for the conjectured QCD critical point in heavy-ion collisions requires to account for far-from equilibrium effects as well as fluctuations, and in particular non-Gaussi…