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Article Dans Une Revue Physical Review D Année : 2021

Dilatonic states near holographic phase transitions

Maurizio Piai
  • Fonction : Auteur
John Roughley
  • Fonction : Auteur

Résumé

The spectrum of bound states of special strongly coupled confining field theories might include a parametrically light dilaton, associated with the formation of enhanced condensates that break (approximate) scale invariance spontaneously. It has been suggested in the literature that such a state may arise in connection with the theory being close to the unitarity bound in holographic models. We extend these ideas to cases where the background geometry is non-AdS, and the gravity description of the dual confining field theory has a top-down origin in supergravity. We exemplify this programme by studying the circle compactification of Romans six-dimensional half-maximal supergravity. We uncover a rich space of solutions, many of which were previously unknown in the literature. We compute the bosonic spectrum of excitations, and identify a tachyonic instability in a region of parameter space for a class of regular background solutions. A tachyon only exists along an energetically disfavoured (unphysical) branch of solutions of the gravity theory; we find evidence of a first-order phase transition that separates this region of parameter space from the physical one. Along the physical branch of regular solutions, one of the lightest scalar particles is approximately a dilaton, and it is associated with a condensate in the underlying theory. Yet, because of the location of the phase transition, its mass is not parametrically small, and it is, coincidentally, the next-to-lightest scalar bound state, rather than the lightest one.
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hal-02981258 , version 1 (01-06-2022)

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Daniel Elander, Maurizio Piai, John Roughley. Dilatonic states near holographic phase transitions. Physical Review D, 2021, 103, pp.106018. ⟨10.1103/PhysRevD.103.106018⟩. ⟨hal-02981258⟩
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