151,462 research outputs found
Modification of Kawai model about the mixing of the pseudoscalar mesons
The Kawai model describing the glueball-quarkonia mixing is modified. The
mixing of , and is re-investigated based on
the modified Kawai model. The glueball-quarkonia content of the three states is
determined from a fit to the data of the electromagnetic decays involving
, . Some predictions about the electromagnetic decays
involving are presented.Comment: revtex 8 page
Twisted Eguchi-Kawai Reduced Chiral Models
We study the twisted Eguchi-Kawai (TEK) reduction procedure for large-N
unitary matrix lattice models. In particular, we consider the case of
two-dimensional principal chiral models, and use numerical Monte Carlo (MC)
simulations to check the conjectured equivalence of TEK reduced model and
standard lattice model in the large-N limit. The MC results are compared with
the large-N limit of lattice principal chiral models to verify the supposed
equivalence. The consistency of the TEK reduction procedure is verified in the
strong-coupling region, i.e. for where is the
location of the large-N phase transition. On the other hand, in the
weak-coupling regime , relevant for the continuum limit, our MC
results do not support the equivalence of the large-N limits of the lattice
chiral model and the corresponding TEK reduction. The implications for the
correspondence between TEK model and noncommutative field theory are also
discussed.Comment: 16 page
Proof of Gravity and Yang-Mills Amplitude Relations
Using BCFW on-shell recursion techniques, we prove a sequence of explicit
n-point Kawai-Lewellen-Tye relations between gravity and Yang-Mills amplitudes
at tree level.Comment: 17 pages, no figures, JHE
`t Hooft model on the Lattice
Lattice results are presented for the meson spectrum of 1+1 dimensional gauge
theory at large , using the Twisted Eguchi-Kawai model. Comparison is made
to the results obtained by `t Hooft in the light cone gauge.Comment: pdflatex 7 page
Large N Dynamics of Dimensionally Reduced 4D SU(N) Super Yang-Mills Theory
We perform Monte Carlo simulations of a supersymmetric matrix model, which is
obtained by dimensional reduction of 4D SU(N) super Yang-Mills theory. The
model can be considered as a four-dimensional counterpart of the IIB matrix
model. We extract the space-time structure represented by the eigenvalues of
bosonic matrices. In particular we compare the large N behavior of the
space-time extent with the result obtained from a low energy effective theory.
We measure various Wilson loop correlators which represent string amplitudes
and we observe a nontrivial universal scaling in N. We also observe that the
Eguchi-Kawai equivalence to ordinary gauge theory does hold at least within a
finite range of scale. Comparison with the results for the bosonic case
clarifies the role of supersymmetry in the large N dynamics. It does affect the
multi-point correlators qualitatively, but the Eguchi-Kawai equivalence is
observed even in the bosonic case.Comment: 35 pages, 17 figure
Holographic dual of the Eguchi-Kawai mechanism
archiveprefix: arXiv primaryclass: hep-th reportnumber: NORDITA-2014-40, UUITP-03-14, QMUL-PH-14-08 slaccitation: %%CITATION = ARXIV:1404.0225;%%archiveprefix: arXiv primaryclass: hep-th reportnumber: NORDITA-2014-40, UUITP-03-14, QMUL-PH-14-08 slaccitation: %%CITATION = ARXIV:1404.0225;%%archiveprefix: arXiv primaryclass: hep-th reportnumber: NORDITA-2014-40, UUITP-03-14, QMUL-PH-14-08 slaccitation: %%CITATION = ARXIV:1404.0225;%%The work of K.Z. was supported by
the ERC advanced grant No 341222, by the Marie Curie network GATIS of the European
Union’s FP7 Programme under REA Grant Agreement No 317089, and by the Swedish
Research Council (VR) grant 2013-4329. DY acknowledges NORDITA where this work
was begun, during his time as a NORDITA fellow
Phase structure of twisted Eguchi-Kawai model
We study the phase structure of the four-dimensional twisted Eguchi-Kawai
model using numerical simulations. This model is an effective tool for studying
SU(N) gauge theory in the large-N limit and provides a nonperturbative
formulation of the gauge theory on noncommutative spaces. Recently it was found
that its Z_N^4 symmetry, which is crucial for the validity of this model, can
break spontaneously in the intermediate coupling region. We investigate in
detail the symmetry breaking point from the weak coupling side. Our simulation
results show that the continuum limit of this model cannot be taken.Comment: 7 pages, 4 figures, talk presented at the XXV International Symposium
on Lattice Field Theory, July 30 - August 4, 2007, Regensburg, German
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