Localization of the scalar and fermionic eigenmodes and confinement J. Greensite, F.V. Gubarev, A.V.Kovalenko, S.M. Morozov, S. Olejnik, MIP, S.V. Syritsyn,

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Presentation transcript:

Localization of the scalar and fermionic eigenmodes and confinement J. Greensite, F.V. Gubarev, A.V.Kovalenko, S.M. Morozov, S. Olejnik, MIP, S.V. Syritsyn, V.I. Zakharov hep-lat/ , hep-lat/ Workshop on Computational Hadron Physics, Hadron Physics I3 Topical Workshop, Cyprus, September 14-17, 2005

Anderson localization in 3D E > E cr (mobility edge) IPR is small

Anderson localization in 3D E < E cr (mobility edge) IPR is large

Eigenmodes localization is characterized by IPR B.Kramer, A.MacKinnon (1993); C.Gattringer et al. (2001); T.Kovacs (2003); C. Aubin et al. [MILC Collaboration] (2004), J.Greensite et al. (2005) F. Bruckmann, E.-M. Ilgenfritz (2005) (Solid state physics, lattice fermions and bosons). Talks at Lattice 2005: N.Cundy, T.De Grand, C.Gattringer, J.Greensite, J.Hetrick, I.Horvath, Y.Koma, S.Solbrig,B.Svetitsky, S.Syritsyn, M.I.P. F. BruckmannE.-M. Ilgenfritz By definition the inverse participation ratio (IPR) is:

IPR EXAMPLES

Scalars fundamental representation (j=1/2) SU(2) lattice gluodynamics

is constant in physical units Scalars (j=1/2) SCALING

P. de Forcrand and M. D'Elia, Phys.Rev.Lett. 82 (1999) 4582 Removing center vortices we get zero string tension and zero quark condensate Z(2) gauge fixing

IPR for full and vortex removed gauge field configurations for SU(2) lattice gluodynamics (fundamental Laplasian, j=1/2) Confinement is similar to Anderson localization?

IPR for large enough l is small ?mobility edge?

Visualization of localization IPR=52IPR=1.9 Time slices, intensity of color is proportional to

Fermions overlap Dirac operator, SU(2) gluodynamics Overlap computer code was given to ITEP group by G. Schierholz and T. Streuer

IPR for overlap lattice fermions before and after removing center vortices Confinement and chiral condensate disappears after removing center vortices (P. de Forcrand and M. d’Ellia (1999); J. Gattnar et al. (2005), what happens with localization?

IPR for various lattice spacings something happens at 150Mev< l <200Mev for all lattice spacings

Localization volume IPR vs volumeIPR vs lattice spacing, V=const

Time slices for IPR=5.13 chirality=-1 IPR=1.45 chirality=0

Localization properties of overlap fermions and scalars (fundamental representation, j=1/2) are qualitatively (not quantitatively ) similar

Scalars adjoint (j=1) and j=3/2 representation SU(2) lattice gluodynamics

Adjoint localization volume d=2? No! Additional analysis (hep-lat/ ) show that adjoint localization volume is 4d, but shrinks to zero in the continuum limit fundamental adjoint

j=3/2 representation Or very strong localization (d=0) or localization volume very fast shrinks to zero when a t 0

Low dimensional structures in lattice gluodynamics 1. I. Horvath et al. hep-lat/ , hep-lat/ , Phys.Rev.D68:114505,2003 I. Horvath I. Horvath 2. MILC collaboration hep-lat/

Summary 1. Localization of eigenfunctions of the Laplacian and Dirac operator is a manifestation of the possible existence of low dimentional objects in the QCD vacuum. 2. The density of the states is in physical units, while the localization volume of the modes tends to zero in physical units “Fine tuning phenomenon” hep-lat/

Appendix

Removing center vortices Confinement and chiral condensate disappears after removing center vortices (P. de Forcrand and M. d’Ellia (1999); J. Gattnar et al. (2005), what happens with localization? Topological charge disappears

Quark condensate Result is in agreement with S.J.Hands and M.Teper (1990), (Wilson fermions) Banks-Casher (1980)

The action of monopoles and center vortices is singular, they exist due to energy-entropy balance (the entropy of lines and surfaces is also singular) Monopoles Center vortices 3D volumes

Length of IR monopole cluster scales, Length of IR monopole cluster scales,

Monopoles have fine tuned action density: Monopoles have fine tuned action density:

P-VORTEX density, Area/(6*V 4 ), scales: P-VORTEX density, Area/(6*V 4 ), scales:

Minimal 3D Volumes bounded by P-vortices scale

P-VORTEX has UV divergent action density: (S-S vac )=Const./ a 2 In lattice units

Monopoles belong to surfaces (center vortices). Monopoles belong to surfaces (center vortices). Surfaces are bounds of minimal 3d volumes in Z(2) Landau gauge 3D analogue: center vortex Minimal 3d volume corresponds to minimal surface spanned on center vortex monopole 3d volume