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  • 1.
    Gran, U.
    et al.
    Chalmers Univ Technol, Div Theoret Phys, Dept Phys, SE-41296 Gothenburg, Sweden..
    Tornso, M.
    Chalmers Univ Technol, Div Theoret Phys, Dept Phys, SE-41296 Gothenburg, Sweden..
    Zingg, Tobias
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..
    Holographic plasmons2018In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 11, article id 176Article in journal (Refereed)
    Abstract [en]

    Since holography yields exact results, even in situations where perturbation theory is not applicable, it is an ideal framework for modeling strongly correlated systems. We extend previous holographic methods to take the dynamical charge response into account and use this to perform the first holographic computation of the dispersion relation for plasmons. As the dynamical charge response of strange metals can be measured using the new technique of momentum-resolved electron energy-loss spectroscopy (M-EELS), plasmon properties are the next milestone in verifying predictions from holographic models of new states of matter.

  • 2. Hossenfelder, Sabine
    et al.
    Zingg, Tobias
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Analogue gravity models from conformal rescaling2017In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 34, no 16, article id 165004Article in journal (Refereed)
    Abstract [en]

    Analogue gravity is based on a mathematical identity between quantum field theory in curved space-time and the propagation of perturbations in certain condensed matter systems. But not every curved space-time can be simulated in such a way. For analogue gravity to work, one needs not only a condensed matter system that generates the desired metric tensor, but this system then also has to obey its own equations of motion. However, the relation to the metric tensor usually overdetermines the equations of the underlying condensed matter system, such that they in general cannot be fulfilled. In this case the desired metric does not have an analogue. Here, we show that the class of metrics that have an analogue is larger than previously thought. The reason is that the analogue metric is only defined up to a choice of parametrization of the perturbation in the underlying condensed matter system. In this way, the class of analogue gravity models can be vastly expanded.

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