2010/10/06 by Antonio Amariti, Amariti, A., Davide Forcella +3
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #High Energy Physics - Theory (hep-th) #Optics (physics.optics) #Other Condensed Matter (cond-mat.other) #Pulsars and Gravitational Waves Research
paper · pdf · doi:10.48550/arxiv.1010.1297
openalex publication_date 2010/10/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the phenomenon of additional light waves (ALWs), observed in crystal optics: two or more electromagnetic waves with the same polarization, but different refractive index, propagate simultaneously in a isotropic medium. We show that ALWs are common in relativistic hydrodynamics, and in particular in strongly coupled systems that admit a dual gravitational description, where the ALWs are dual to quasi normal modes in the AdS gravity. We study both the transverse and the longitudinal light wave propagation. In the longitudinal channel we find a transition between regimes with different number of excitonic resonances which resembles the transition to standard optics observed in crystals.