Breaking the sound barrier in holography

Hoyos, Carlos; Jokela, Niko; Fernández, David Rodríguez; Vuorinen, Aleksi

doi:10.1103/physrevd.94.106008

Cited by 69 publications

(72 citation statements)

References 65 publications

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“…Thus, our EoS is stiff enough to support more massive neutron stars. This is in contrast to the holographic neutron star model based on D3/D7-branes proposed in [34][35][36], where they need the additional inputs outside their model to break the sound barrier. 6 The conformal barrier for the sound speed in SS model is cs = 2c/ √ 5 for the phase of chiral restoration [33], and is cs = c/ √ 3 for the D3/D7 model [35].…”

Section: Equation Of Statementioning

confidence: 77%

Compact star of holographic nuclear matter and GW170817

Hong¹,

Hirayama²,

Luo³

et al. 2020

Physics Letters B

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We use a holographic model of quantum chromodynamics to extract the equation of state (EoS) for the cold nuclear matter of moderate baryon density. This model is based on the Sakai-Sugimoto model in the deconfined Witten's geometry with the additional point-like D4-brane instanton configuration as the holographic baryons. Our EoS takes the following doubly-polytropic form: = 2.629A −0.192 p 1.192 + 0.131A 0.544 p 0.456 with A a tunable parameter of order 10 −1 , where and p are the energy density and pressure, respectively. The sound speed satisfies the causality constraint and breaks the sound barrier. We solve the Tolman-Oppenheimer-Volkoff equations for the compact stars and obtain the reasonable compactness for the proper choices of A. Based on these configurations we further calculate the tidal deformability of the single and binary stars. We find our results agree with the inferred values of LIGO/Virgo data analysis for GW170817.

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Section: Equation Of Statementioning

confidence: 77%

Compact star of holographic nuclear matter and GW170817

Hong¹,

Hirayama²,

Luo³

et al. 2020

Physics Letters B

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“…Though the methods we use are standard [106], we encounter several subtleties with logarithms, and the associated renormalization scheme. Therefore, we prefer to essentially follow the conventions set in [81,82], where also a much more expanded discussion can be found.…”

Section: B Boundary Analysis and Holographic Renormalizationmentioning

confidence: 99%

Brane nucleation instabilities in non-AdS/non-CFT

Henriksson

Hoyos

Jokela

2020

J. High Energ. Phys.

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We speculate that the weak gravity conjecture applied to theories with holographic duals bans the existence of disordered phases at zero temperature. We test this idea by introducing a nonzero baryon chemical potential in a deformation of the SU (N c ) × SU (N c ) Klebanov-Witten gauge theory with broken supersymmetry and conformal invariance. At low temperature, a disordered phase dual to a black brane geometry is unstable for low chemical potentials and metastable for high values. In the metastable phase, states with a partial Higgsing of the gauge group are favored over the normal disordered phase. This is reflected in the properties of the effective potential for color branes in the dual geometry, where the appearance of a global minimum outside the horizon signals the onset of a brane nucleation instability. When the Higgsing involves only one of the group factors, the global minimum remains at a finite distance from the horizon, making it possible to construct holographic duals to metastable "color superconducting" states. We also consider branes dual to excitations with baryon charge, but find that the extremal geometry remains marginally stable against the emission of particles carrying baryon charge independently of the strength of the deformation. * oscar.henriksson@helsinki.fi † hoyoscarlos@uniovi.es ‡ niko.jokela@helsinki.fi

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“…Furthermore, the gravitational action describes both the hadronic phase with confinement and a deconfined phase, where quarks and gluons should be the dynamical degrees of freedom, although they cannot be directly observed as they are not gauge-invariant fields. On the other hand, physical quantities, like the equation of state (see, e.g., [20,21]), in the deconfined phase depend on the same parameters of the gravitational action as the scattering lengths. Therefore, our analysis establishes a direct link between hadronic physics and the physics of quarks and gluons at low energies, something that seems out of reach using ordinary field theory methods.…”

Section: Introductionmentioning

confidence: 99%

Scattering length from holographic duality

2020

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Interesting theories with short range interactions include QCD in the hadronic phase and cold atom systems. The scattering length in two-to-two elastic scattering process captures the most elementary features of the interactions, such as whether they are attractive or repulsive. However, even this basic quantity is notoriously difficult to compute from first principles in strongly coupled theories. We present a method to compute the two-to-two amplitudes and the scattering length using the holographic duality. Our method is based on the identification of the residues of Green's functions in the gravity dual with the amplitudes in the field theory. To illustrate the method we compute a contribution to the scattering length in a hard wall model with a quartic potential and find a constraint on the scaling dimension of a scalar operator ∆ > d/4. For d < 4 this is more stringent than the unitarity constraint and may be applicable to an extended family of large-N theories with a discrete spectrum of massive states. We also argue that for scalar potentials with polynomial terms of order K, a constraint more restrictive than the unitarity bound will appear for d < 2K/(K − 2).

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Breaking the sound barrier in holography

Cited by 69 publications

References 65 publications

Compact star of holographic nuclear matter and GW170817

Compact star of holographic nuclear matter and GW170817

Brane nucleation instabilities in non-AdS/non-CFT

Scattering length from holographic duality

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