Date: Thu, 29 Nov 12 01:08:43 GMT Subject: hep-lat daily 4 new + 1 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: hep-lat@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Tue 27 Nov 12 21:00:00 GMT to Wed 28 Nov 12 21:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1211.6495 Date: Wed, 28 Nov 2012 01:27:40 GMT (118kb) Title: Chiral symmetry breaking in lattice brane QED model Authors: Eigo Shintani, Tetsuya Onogi Categories: hep-lat cond-mat.str-el hep-ph Comments: 7 pages, 4 figures, Proceedings of the 30th International Symposium on Lattice Field Theory, June 24--29, 2012, Cairns, Australia Journal-ref: PoS(Lattice 2012)062 \\ We propose a novel lattice calculation of spontaneous chiral symmetry breaking in QED model with 2+1 dimensional fermion brane. Considering the relativistic action with gauge symmetry we rigorously carry out path integral in Monte-Carlo simulation with Fermi-velocity relevant to effective coupling constant. We numerically show the evidence of spontaneous chiral symmetry breaking in strong coupling region with chiral condensate, low-lying mode distribution and Nambu-Goldstone boson spectrum in bare Fermi-velocty $v=0.1$. This is a feasible study to investigate the phase structure of Graphene. \\ ( http://arxiv.org/abs/1211.6495 , 118kb) ------------------------------------------------------------------------------ \\ arXiv:1211.6577 Date: Wed, 28 Nov 2012 11:12:39 GMT (255kb,D) Title: Direct determination of the strange and light quark condensates from full lattice QCD Authors: C. McNeile, A. Bazavov, C. T. H. Davies, R. J. Dowdall, K. Hornbostel, G. P. Lepage and H. D. Trottier Categories: hep-lat hep-ph Comments: 21 pages, 13 figures \\ We determine the strange quark condensate from lattice QCD for the first time and compare its value to that of the light quark and chiral condensates. The results come from a direct calculation of the expectation value of the trace of the quark propagator followed by subtraction of the appropriate perturbative contribution, derived here, to convert the non-normal-ordered $m\bar{\psi}\psi$ to the $\bar{MS}$ scheme at a fixed scale. This is then a well-defined physical `nonperturbative' condensate that can be used in the Operator Product Expansion of current-current correlators. The perturbative subtraction is calculated through $\mathcal{O}(\alpha_s)$ and estimates of higher order terms are included through fitting results at multiple lattice spacing values. The gluon field configurations used are `second generation' ensembles from the MILC collaboration that include 2+1+1 flavors of sea quarks implemented with the Highly Improved Staggered Quark action and including $u/d$ sea quarks down to physical masses. Our results are : $<\bar{s}{s}>^{\bar{MS}}(2 \mathrm{GeV})= -(290(15) \mathrm{MeV})^3$, $<\bar{l}{l}>^{\bar{MS}}(2\, \mathrm{GeV})= -(283(2) \mathrm{MeV})^3$, where $l$ is a light quark with mass equal to the average of the $u$ and $d$ quarks. The strange to light quark condensate ratio is 1.08(16). The light quark condensate is significantly larger than the chiral condensate in line with expectations from chiral analyses. We discuss the implications of these results for other calculations. \\ ( http://arxiv.org/abs/1211.6577 , 255kb) ------------------------------------------------------------------------------ \\ arXiv:1211.6651 Date: Wed, 28 Nov 2012 16:48:31 GMT (183kb) Title: Low energy spectra in many flavor QCD with Nf=12 and 16 Authors: Yasumichi Aoki, Tatsumi Aoyama, Masafumi Kurachi, Toshihide Maskawa, Kei-ichi Nagai, Hiroshi Ohki, Akihiro Shibata, Koichi Yamawaki, Takeshi Yamazaki Categories: hep-lat hep-ph Comments: 7 pages, 5 figures, Talk presented at The 30 International Symposium on Lattice Field Theory - Lattice 2012, June 24-29, 2012 Cairns, Australia \\ We present our result of the many-flavor QCD. Information of the phase structure of many-flavor SU(3) gauge theory is of great interest, since the gauge theories with the walking behavior near the infrared fixed point are candidates of new physics for the origin of the dynamical electroweak symmetry breaking. We study the SU(3) gauge theories with 12 and 16 fundamental fermions. Utilizing the HISQ type action which is useful to study the continuum physics, we analyze the lattice data of the mass and the decay constant of the pseudoscalar meson and the mass of the vector meson as well at several values of lattice spacing and fermion mass. The finite size scaling test in the conformal hypothesis is also performed. Our data is consistent with the conformal scenario for Nf=12. We obtain the mass anomalous dimension $\gamma_m \sim 0.4-0.5$. An update of $N_f=16$ study is also shown. \\ ( http://arxiv.org/abs/1211.6651 , 183kb) ------------------------------------------------------------------------------ \\ arXiv:1211.6669 Date: Wed, 28 Nov 2012 17:29:18 GMT (55kb,D) Title: Implications of Poincare symmetry for thermal field theories in finite-volume Authors: Leonardo Giusti and Harvey B. Meyer Categories: hep-lat hep-th math-ph math.MP Comments: 26 pages, 3 figures \\ The analytic continuation to an imaginary velocity $i\xi$ of the canonical partition function of a thermal system expressed in a moving frame has a natural implementation in the Euclidean path-integral formulation in terms of shifted boundary conditions. Writing the Boltzmann factor as $\exp[-L_0(H-i\xi.P)]$, the Poincare invariance underlying a relativistic theory implies a dependence of the free-energy on $L_0$ and the shift $\xi$ only through the combination $\beta= L_0 \sqrt{1+\xi^2}$. This in turn implies a set of Ward identities, some of which were previously derived by us, among the correlators of the energy-momentum tensor. In the infinite-volume limit they lead to relations among the cumulants of the total energy distribution and those of the momentum, i.e. they connect the energy and the momentum distributions in the canonical ensemble. In finite volume the Poincare symmetry translates into exact relations among partition functions and correlation functions defined with different sets of (generalized) periodic boundary conditions. They have interesting applications in lattice field theory. In particular, they offer Ward identities to renormalize non-perturbatively the energy-momentum tensor and novel ways to compute thermodynamic potentials. At fixed bare parameters they also provide a simple method to vary the temperature in much smaller steps than with the standard procedure. \\ ( http://arxiv.org/abs/1211.6669 , 55kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1211.6125 (*cross-listing*) Date: Mon, 26 Nov 2012 21:02:00 GMT (1016kb) Title: V-QCD: Spectra, the dilaton and the S-parameter Authors: Daniel Arean, Ioannis Iatrakis, Matti Jarvinen, Elias Kiritsis Categories: hep-ph hep-lat hep-th Comments: 11 pages, 6 figures Report-no: CCTP-2012-19 \\ Zero temperature spectra of mesons and glueballs are analyzed in a class of holographic bottom-up models for QCD (named V-QCD), as a function of x = N_f/N_c with the full back-reaction included. It is found that spectra are discrete and gapped (modulo the pions) in the QCD regime, for x below the critical value x_c where the conformal transition takes place. The masses uniformly converge to zero in the walking region x -> x_c due to Miransky scaling. The ratio of masses all asymptote to non-zero constants as x -> x_c and therefore there is no "dilaton" in the spectrum. The S-parameter is computed and found to be of O(1) in the walking regime. \\ ( http://arxiv.org/abs/1211.6125 , 1016kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1208.1328 (*cross-listing*) replaced with revised version Wed, 28 Nov 2012 05:31:43 GMT (116kb,D) Title: Structure and rotations of the Hoyle state Authors: Evgeny Epelbaum, Hermann Krebs, Timo L\"ahde, Dean Lee, Ulf-G. Mei{\ss}ner Categories: nucl-th astro-ph.SR hep-lat nucl-ex Comments: 4 pages, 3 figures, 4 tables, version to be published in Physical Review Letters \\ ( http://arxiv.org/abs/1208.1328 , 116kb) ------------------------------------------------------------------------------ \\ arXiv:1210.5887 (*cross-listing*) replaced with revised version Wed, 28 Nov 2012 13:32:19 GMT (551kb,D) Title: Baryon electric dipole moments from strong CP violation Authors: Feng-Kun Guo, Ulf-G. Mei{\ss}ner Categories: hep-ph hep-lat nucl-th Comments: 30 pages, 8 figures, to appear in JHEP \\ ( http://arxiv.org/abs/1210.5887 , 551kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arXiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arXiv.org/help/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. Author self-submissions are exceedingly preferred. E-mail submissions have been discontinued in favor of better support for Web submissions. See http://arXiv.org/help/uploads