Momentum dissipation and effective theories of coherent and incoherent transport
2015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, no 1, 039Article in journal (Refereed) Published
We study heat transport in two systems without momentum conservation: a hydrodynamic system, and a holographic system with spatially dependent, massless scalar fields. When momentum dissipates slowly, there is a well-defined, coherent collective excitation in the AC heat conductivity, and a crossover between sound-like and diffusive transport at small and large distance scales. When momentum dissipates quickly, there is no such excitation in the incoherent AC heat conductivity, and diffusion dominates at all distance scales. For a critical value of the momentum dissipation rate, we compute exact expressions for the Green's functions of our holographic system due to an emergent gravitational self-duality, similar to electric/magnetic duality, and SL(2,R) symmetries. We extend the coherent/incoherent classification to examples of charge transport in other holographic systems: probe brane theories and neutral theories with non-Maxwell actions.
Place, publisher, year, edition, pages
2015. no 1, 039
Holography and condensed matter physics (AdS/CMT), AdS-CFT Correspondence
IdentifiersURN: urn:nbn:se:su:diva-115461DOI: 10.1007/JHEP01(2015)039ISI: 000347687300002OAI: oai:DiVA.org:su-115461DiVA: diva2:798436