Date: Wed, 27 May 15 00:17:13 GMT Subject: hep-lat daily 1 new + 4 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 Mon 25 May 15 20:00:00 GMT to Tue 26 May 15 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1505.07057 Date: Tue, 26 May 2015 17:32:32 GMT (322kb,D) Title: Inclusion of isospin breaking effects in lattice simulations Authors: Antonin Portelli Categories: hep-lat hep-ph Comments: 16 pages, 5 figures, Contribution to the Proceedings of the 32nd International Symposium on Lattice Field Theory (Lattice 2014), 23-28 June 2014, Columbia University, New York, NY, USA \\ Isospin symmetry is explicitly broken in the Standard Model by the mass and electric charge of the up and down quarks. These effects represent a perturbation of hadronic amplitudes at the percent level. Although these contributions are small, they play a crucial role in hadronic and nuclear physics. Moreover, as lattice computations are becoming increasingly precise, it is becoming more and more important to include these effects in numerical simulations. We summarize here how to properly define QCD and QED on a finite and discrete space-time so that isospin corrections to hadronic observables can be computed ab-initio and we review the main results on the isospin corrections to the hadron spectrum. We mainly focus on the recent work going beyond the electro-quenched approximation. \\ ( http://arxiv.org/abs/1505.07057 , 322kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1505.06799 (*cross-listing*) Date: Tue, 26 May 2015 03:49:31 GMT (801kb) Title: Topological feature and phase structure of QCD at complex chemical potential Authors: Kouji Kashiwa, Akira Ohnishi Categories: hep-ph hep-lat hep-th Comments: 5 pages, 3 figures Report-no: YITP-15-45 \\ The pseudo-critical temperature of the confinement-deconfinement transition and the phase transition surface are investigated by using the complex chemical potential. We can interpret the imaginary chemical potential as the Aharonov-Bohm phase, then the analogy of the topological order suggests that the Roberge-Weiss endpoint would define the pseudo-critical temperature. The behavior of the Roberge-Weiss endpoint at small real quark chemical potential is investigated with the perturbative expansion. The expected QCD phase diagram at complex chemical potential is presented. \\ ( http://arxiv.org/abs/1505.06799 , 801kb) ------------------------------------------------------------------------------ \\ arXiv:1505.06997 (*cross-listing*) Date: Tue, 26 May 2015 15:17:55 GMT (262kb) Title: A new tool in nuclear physics: Nuclear lattice simulations Authors: Ulf-G. Mei{\ss}ner Categories: nucl-th hep-lat hep-ph nucl-ex Comments: commissioned article for Nuclear Physics News Journal-ref: Nucl. Phys. News 24, No. 4 (2014) 11-15 DOI: 10.1080/10619127.2014.972167 \\ In the last years, chiral effective field theory has been successfully developed for and applied to systems with few nucleons. Here, I present a new approach for ab initio calculations of nuclei that combines these precise and systematic forces with Monte Carlo simulation techniques that allow for exact solutions of the nuclear A-body problem. A short introduction of this method is given and a few assorted results concerning the spectrum and structure of 12C and 16O are presented. The framework further allows one to study the properties of nuclei in worlds that have fundamental parameters different from the ones in Nature. This allows for a physics test of the anthropic principle by addressing the question how strongly the generation of the life-relevant elements depends on the light quark masses and the electromagnetic fine structure constant. \\ ( http://arxiv.org/abs/1505.06997 , 262kb) ------------------------------------------------------------------------------ \\ arXiv:1505.07000 (*cross-listing*) Date: Tue, 26 May 2015 15:19:26 GMT (45kb) Title: Regularization Methods for Nuclear Lattice Effective Field Theory Authors: Nico Klein, Dean Lee, Weitao Liu, Ulf-G. Mei{\ss}ner Categories: nucl-th hep-lat hep-ph Comments: 6 pp, 2 figs \\ We investigate Nuclear Lattice Effective Field Theory for the two-body system for several lattice spacings at lowest order in the pionless as well as in the pionful theory. We discuss issues of regularizations and predictions for the effective range expansion. In the pionless case, a simple Gaussian smearing allows to demonstrate lattice spacing independence over a wide range of lattice spacings. We show that regularization methods known from the continuum formulation are necessary as well as feasible for the pionful approach. \\ ( http://arxiv.org/abs/1505.07000 , 45kb) ------------------------------------------------------------------------------ \\ arXiv:1505.07065 (*cross-listing*) Date: Tue, 26 May 2015 17:49:42 GMT (4225kb) Title: Properties of Confinement in Holography Authors: Dimitrios Giataganas Categories: hep-th hep-lat Comments: 20 pages, 2 figures, Contribution to the Proceedings of the Workshop on Quantum Fields and Strings, (Corfu, September 2014) \\ We review certain properties of confinement with added focus on the ones we study with holography. Then we discuss observables whose unique behavior can indicate the presence of confinement. Using mainly the Wilson loop in the gauge/gravity formalism, we study two main features of the QCD string: the string tension dependence on the temperature while in the confining phase, and the logarithmic broadening of the flux tube between the heavy static charges that turns out to be a generic property of all confining theories. Finally, we review the k-string bound state and we show that for a wide class of generic theories the k-string observables can be expressed in terms of the single meson bound state observables. \\ ( http://arxiv.org/abs/1505.07065 , 4225kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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/