12 papers
Effective field theory of quasi-hydrodynamics from kinetic theory
Lorenzo Gavassino
Quasi-hydrodynamics describes systems with quasi-conserved degrees of freedom, namely observables that relax on timescales that are finite but parametrically longer than microscopi…
Relativistic transport near moving interfaces
Lorenzo Gavassino
The paper studies linear disturbances near planar surfaces moving at constant speed in relativistic media, presenting a propagator-based geometric framework that unifies the descri…
The Lorentzian geometry of relaxation
Lorenzo Gavassino
We show that relativistic theories with purely relaxational excitation spectra, such as kinetic theory and transient hydrodynamics, naturally endow the dispersion plane $\{iÏ,ik\}…
The quasi-normal modes of relativistic Fokker-Planck kinetic theory
Lorenzo Gavassino
Employing the well-known unitary equivalence between Fokker-Planck operators and Schrödinger Hamiltonians, we compute the quasi-normal-mode spectrum of ultrarelativistic kinetic t…
The diffusion equation is compatible with special relativity
Lorenzo Gavassino
Due to its parabolic character, the diffusion equation exhibits instantaneous spatial spreading, and becomes unstable when Lorentz-boosted. According to the conventional interpreta…
How Lorentz boosts reshape relaxation spectra
Lorenzo Gavassino
In relativity, relaxation processes are often assumed to undergo time dilation under Lorentz boosts. We show that this intuition fails generically. Due to relativity of simultaneit…