5d truncation ignoring the 5-sphere (SO(6) gauge symmetry) There are 42 scalars - a 20 of SO(6) - a 10 and 10 of SO(6) - scalar dilaton-axion, singlets.

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Presentation transcript:

5d truncation ignoring the 5-sphere (SO(6) gauge symmetry) There are 42 scalars - a 20 of SO(6) - a 10 and 10 of SO(6) - scalar dilaton-axion, singlets of SO(6) – dual to

Dilaton Flow in 5d Supergravity If we preserve SO(6) things should be simplest – there are non-trivial dilaton flows Analytic solutions that can be lifted to 10d supergravity Tr F is non-zero 2 Gubser, Nojiri,Odinstov,Ghoroku…

Mass Gap / Confined Glueballs We seek normalizable fluctuations in Tr F / dilaton 2 Gubser

Wilson Lines The interaction energy between a quark and an anti-quark is given by embedding a string in the space: D7 The singularity repels the string and it lies along the wall – a linear potential emerges Gubser Ghoroku…

Chiral Symmetry Breaking This theory has a U(1) symmetry that is dynamically broken by a quark condensate BEEKG, Ghoroku… The core of the geometry is again repulsive - the D7 brane does not lie flat but bends explicitly breaking a U(1) symmetry of the geometry

Meson Masses We seek normalizable fluctuations of the D7 Massless Goldstone Massive sigma and rho mesons As in all AdS duals these states are tightly bound m ~ 1/ lambda 1/2 BEEKG, Ghoroku…

High Temperature Phase The duals of high T gauge theories are black holes – their free energy scales like N (Witten) Analytically can show there is no black hole with dilaton hair – the only black hole in 5d supergravity is AdS-Schwarzschild 2 NE, Threlfall How can there be no finite T description of our theory??

The key point is that when susy is broken and SO(6) preserved we expect all SO(6) preserving operators to be present… these include This mode is not represented by a supergravity mode – it’s an invisible string mode… These configs are dual to D3 5-balls – Gauss’ law gives pure AdS background. We conclude the SO(6) invariant mass is the true deformation in the Lagrangian… Tr F is an induced operator that is present at zero temperature but not in the high T phase 2 Scalar Mass Deformed N=4 SYM NE, Threlfall

The Thermal Phase Transition We can compare the free energies of the dilaton flow geometry (with compact Euclidean time) and the black hole (fixing the rho mass) A first order transition NE, Threlfall

Plasma Properties At the supergravity level this non-supersymmetric theory and the N=4 theory share the same supergravity dual Regular glueball and meson solutions are replaced by in-falling quasi-normal modes… the bound states decay into the thermal bath = (Son, Starinets,Policastro) (Hoyos.., Myers…, Peeters…)

Summary Dilaton Flow QCD is a holographic model with Confinement Mass gap A quark condensate A massless pion & a massive rho A thermal deconfinement transition Meson melting at high T It is derived from the AdS/CFT Correspondence so describes a real gauge theory and contains the DYNAMICS for all this physics (unlike AdS/QCD) (Sakai-Sugimoto has in addition a non-abelian chiral symmetry but at the expense of being fundamentally five dimensional) A review: arXiv: [hep-th] Also arXiv: [hep-th]

Hadronization NE, Tedder The hadron’s emerging in an electron positron collider are not understood from first principles Monte Carlo event generators are tuned to data.

Our model will come down to matching conditions at the point of hadronization… we will argue a simple ansatz does a good job of matching the data We will dump energy into the holographic model’s stress energy tensor and see how it evolves into hadrons We will assume all hadronic species are equally accessible to production Philosophy

Rho production We obtain the yields (c ): rho 15 rho* 3 rho** 0… The rho is described by a gauge field in 5d. There are a set of orthogonal functions If we expand a Gaussian (centred on r=0, width 300MeV) initial condition in terms of these basis functions n 2

We have basis functions for pseudo-Goldstones… To do the whole QCD spectra (127 pts with mass below 1.7 GeV) we rescale r coordinate by m /m – the Gaussian does not stretch and we see a suppressed yield. Spin factor of (2J+1) on production rates rhohadron Fit parameters Gaussian Width Gaussian Height The stress energy tensor contributions (rho vs pion) in our holographic model depends on the ‘tHooft coupling ( AdS radius R) – we fit it. A Complete Toy

Most of these will decay in transit to the detector…. We use branching ratios from experiment (pdg via HERWIG) to get final yields EG The average results from a phi (1020) decay…. Decay in Transit

Decent match across orders of magnitude in production rates.. RMS of fit 37% Parameters Width = 150 MeV = 0.97 R = 2.6 Average E = 5.0 GeV Final LEP Yields

Summary Holographic duals of gauge theories with Confinement Mass gap A quark condensate A massless pion & a massive rho A thermal deconfinement transition Meson melting at high T A review: arXiv: [hep-th] Also arXiv: [hep-th] We seem to shed some light on hadronization multiplicities…. arXiv: [hep-ph]