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      "material": "Article", 
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      "year": "2018"
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  "authors": [
    {
      "affiliations": [
        {
          "country": "UK", 
          "value": "Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Department of Physics, Clarendon Laboratory, Oxford, OX1 3NU, U.K.", 
          "organization": "Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Department of Physics, Clarendon Laboratory"
        }
      ], 
      "surname": "Gushterov", 
      "email": "nikola.gushterov@physics.ox.ac.uk", 
      "full_name": "Gushterov, Nikola", 
      "given_names": "Nikola"
    }, 
    {
      "affiliations": [
        {
          "country": "UK", 
          "value": "STAG Research Centre, Physics and Astronomy, University of Southampton Highfield, Southampton, SO17 1BJ, U.K.", 
          "organization": "University of Southampton Highfield"
        }
      ], 
      "surname": "O\u2019Bannon", 
      "email": "a.obannon@soton.ac.uk", 
      "full_name": "O\u2019Bannon, Andy", 
      "given_names": "Andy"
    }, 
    {
      "affiliations": [
        {
          "country": "UK", 
          "value": "STAG Research Centre, Physics and Astronomy, University of Southampton Highfield, Southampton, SO17 1BJ, U.K.", 
          "organization": "University of Southampton Highfield"
        }
      ], 
      "surname": "Rodgers", 
      "email": "r.j.rodgers@soton.ac.uk", 
      "full_name": "Rodgers, Ronnie", 
      "given_names": "Ronnie"
    }
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  "titles": [
    {
      "source": "Springer", 
      "title": "Holographic zero sound from spacetime-filling branes"
    }
  ], 
  "collections": [
    {
      "primary": "Journal of High Energy Physics"
    }
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    {
      "value": "10.1007/JHEP10(2018)076"
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  "publication_info": [
    {
      "page_end": "58", 
      "journal_title": "Journal of High Energy Physics", 
      "material": "article", 
      "journal_volume": "2018", 
      "year": 2018, 
      "page_start": "1", 
      "journal_issue": "10"
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  "$schema": "http://repo.scoap3.org/schemas/hep.json", 
  "abstracts": [
    {
      "source": "Springer", 
      "value": "We use holography to study sound modes of strongly-interacting conformal field theories with non-zero temperature, T , and U(1) chemical potential, \u03bc. Specifically, we consider charged black brane solutions of Einstein gravity in (3+1)-dimensional Anti-de Sitter space coupled to a U(1) gauge field with Dirac-Born-Infeld action, representing a spacetime-filling brane. The brane action has two free parameters: the tension and the non-linearity parameter, which controls higher-order terms in the field strength. For all values of the tension, non-linearity parameter, and T /\u03bc, and at sufficiently small momentum, we find sound modes with speed given by the conformal value and attenuation constant of hydrodynamic form. In particular we find sound at arbitrarily low T /\u03bc, outside the usual hydrodynamic regime, but in the regime where a Fermi liquid exhibits Landau\u2019s \u201czero\u201d sound. In fact, the sound attenuation constant as a function of T /\u03bc qualitatively resembles that of a Fermi liquid, including a maximum, which in a Fermi liquid signals the collisionless to hydrodynamic crossover. We also explore regimes of the tension and non-linearity parameter where two other proposed definitions of the crossover are viable, via pole collisions in Green\u2019s functions or peak movement in the charge density spectral function."
    }
  ], 
  "imprints": [
    {
      "date": "2018-10-11", 
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