Holographic 5D model shows confinement critical temperature falls quadratically with vacuum angle, matches lattice QCD, and allows time-dependent theta to trigger supercooling and altered gravitational-wave spectra.
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Exploring improved holographic theories for QCD: Part I
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abstract
Various holographic approaches to QCD in five dimensions are explored using input both from the putative non-critical string theory as well as QCD. It is argued that a gravity theory in five dimensions coupled to a dilaton and an axion may capture the important qualitative features of pure QCD. A part of the higher alpha' corrections are resummed into a dilaton potential. The potential is shown to be in one-to-one correspondence with the exact beta-function of QCD, and its knowledge determines the full structure of the vacuum solution. The geometry near the UV boundary is that of AdS_5 with logarithmic corrections reflecting the asymptotic freedom of QCD. We find that all relevant confining backgrounds have an IR singularity of the "good" kind that allows unambiguous spectrum computations. Near the singularity the 't Hooft coupling is driven to infinity. Asymptotically linear glueball masses can also be achieved. The classification of all confining asymptotics, the associated glueball spectra and meson dynamics are addressed in a companion paper, ArXiv:0707.1349
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A coupled DSE-FRG-holographic model predicts the QCD critical end point at T_CEP approximately 130-135 MeV and mu_B,CEP approximately 600 MeV, with sensitivity to regulator and normalization choices.
Holographic analysis of scattering off Chamblin-Reall branes shows that for d>1 incident radiation redistributes into reflected, transmitted, and evanescent components, with d=2 yielding diffuse scattering like a translucent window and d=4 requiring IR regulation.
A tachyonic AdS/QCD construction deforms the bulk geometry with a tachyon-dependent dielectric function to produce a unified running coupling from perturbative UV to nonperturbative IR regimes.
In O(d,d) symmetric gravity with curvature corrections, black brane singularities are not resolved but approach with altered Kasner exponents, while a dilaton generates negative cosmological constants at small coupling.
Soft-wall warped geometries yield rapid, mildly supercooled phase transitions whose TeV-scale gravitational wave signals are accessible to space-based interferometers.
A two-gluon constituent model with instanton-induced mass and adjoint confinement predicts a compact scalar glueball of radius ~1/3 fm and an extended tensor state, matching quenched lattice results.
Holographic AdS/QCD calculations of configurational entropy and complexity for Delta baryons yield Regge trajectories that organize known masses and predict additional resonances.
In Starobinsky-dilaton holographic QCD, rho meson masses match experiment for α = 10^{-8} and recover prior results at α = 0.
Introducing an energy scale in AdS space changes the topological class of black holes, corresponding to confined and deconfined phases separated by a Hawking-Page transition at finite critical temperature.
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Confinement in Holographic Theories at Finite Theta
Holographic 5D model shows confinement critical temperature falls quadratically with vacuum angle, matches lattice QCD, and allows time-dependent theta to trigger supercooling and altered gravitational-wave spectra.
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Unified Functional-Holographic Theory of the QCD Critical End Point
A coupled DSE-FRG-holographic model predicts the QCD critical end point at T_CEP approximately 130-135 MeV and mu_B,CEP approximately 600 MeV, with sensitivity to regulator and normalization choices.
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Scattering off Chamblin-Reall Branes
Holographic analysis of scattering off Chamblin-Reall branes shows that for d>1 incident radiation redistributes into reflected, transmitted, and evanescent components, with d=2 yielding diffuse scattering like a translucent window and d=4 requiring IR regulation.
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Tachyonic AdS/QCD, Determining the Strong Running Coupling and \beta-function in both UV and IR Regions of AdS Space
A tachyonic AdS/QCD construction deforms the bulk geometry with a tachyon-dependent dielectric function to produce a unified running coupling from perturbative UV to nonperturbative IR regimes.
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$O(d,d)$ symmetric gravity and finite coupling holography
In O(d,d) symmetric gravity with curvature corrections, black brane singularities are not resolved but approach with altered Kasner exponents, while a dilaton generates negative cosmological constants at small coupling.
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Uncool soft-wall transitions and gravitational waves
Soft-wall warped geometries yield rapid, mildly supercooled phase transitions whose TeV-scale gravitational wave signals are accessible to space-based interferometers.
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Glueballs, Constituent Gluons and Instantons
A two-gluon constituent model with instanton-induced mass and adjoint confinement predicts a compact scalar glueball of radius ~1/3 fm and an extended tensor state, matching quenched lattice results.
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Holographic information measures for spin-$3/2$ $\Delta$ baryons in AdS/QCD
Holographic AdS/QCD calculations of configurational entropy and complexity for Delta baryons yield Regge trajectories that organize known masses and predict additional resonances.
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Vector mesons from a holographic QCD model in $f(R)$-dilaton gravity
In Starobinsky-dilaton holographic QCD, rho meson masses match experiment for α = 10^{-8} and recover prior results at α = 0.
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Topological charges and confined-deconfined phase transition in holography
Introducing an energy scale in AdS space changes the topological class of black holes, corresponding to confined and deconfined phases separated by a Hawking-Page transition at finite critical temperature.