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Worldvolume approach to the tempered Lefschetz thimble method 调质Lefschetz顶针法的世界体积方法
arXiv: High Energy Physics - Lattice Pub Date : 2020-12-15 DOI: 10.1093/PTEP/PTAB010
M. Fukuma, N. Matsumoto
{"title":"Worldvolume approach to the tempered Lefschetz thimble method","authors":"M. Fukuma, N. Matsumoto","doi":"10.1093/PTEP/PTAB010","DOIUrl":"https://doi.org/10.1093/PTEP/PTAB010","url":null,"abstract":"As a solution towards the numerical sign problem, we propose a novel Hybrid Monte Carlo algorithm, in which molecular dynamics is performed on a continuum set of integration surfaces foliated by the antiholomorphic gradient flow (\"the worldvolume of an integration surface\"). This is an extension of the tempered Lefschetz thimble method (TLTM), and solves the sign and multimodal problems simultaneously as the original TLTM does. Furthermore, in this new algorithm, one no longer needs to compute the Jacobian of the gradient flow in generating a configuration, and only needs to evaluate its phase upon measurement. To demonstrate that this algorithm works correctly, we apply the algorithm to a chiral random matrix model, for which the complex Langevin method is known not to work.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87869911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
Excited J−− meson resonances at the SU(3) flavor point from lattice QCD 晶格QCD中SU(3)风味点的激发J−−介子共振
arXiv: High Energy Physics - Lattice Pub Date : 2020-12-01 DOI: 10.1103/PHYSREVD.103.074502
Christopher T. Johnson, J. Dudek
{"title":"Excited \u0000J−−\u0000 meson resonances at the SU(3) flavor point from lattice QCD","authors":"Christopher T. Johnson, J. Dudek","doi":"10.1103/PHYSREVD.103.074502","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.074502","url":null,"abstract":"We present the first calculation within lattice QCD of excited light meson resonances with $J^{PC} = 1^{--}$, $2^{--}$ and $3^{--}$. Working with an exact SU(3) flavor symmetry, for the singlet representation of pseudoscalar-vector scattering, we find two $1^{--}$ resonances, a lighter broad state and a heavier narrow state, a broad $2^{--}$ resonance decaying in both $P$- and $F$-waves, and a narrow $3^{--}$ state. We present connections to experimental $omega^star_J, phi^star_J$ resonances decaying into $pi rho$, $Kbar{K}^*$, $eta omega$ and other final states.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87472009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
New Abelian-like monopoles and the dual Meissner effect 新类阿贝尔单极子和双迈斯纳效应
arXiv: High Energy Physics - Lattice Pub Date : 2020-11-29 DOI: 10.1103/physrevd.102.114504
Atsuki Hiraguchi, K. Ishiguro, Tsuneo Suzuki
{"title":"New Abelian-like monopoles and the dual Meissner effect","authors":"Atsuki Hiraguchi, K. Ishiguro, Tsuneo Suzuki","doi":"10.1103/physrevd.102.114504","DOIUrl":"https://doi.org/10.1103/physrevd.102.114504","url":null,"abstract":"Violation of non-Abelian Bianchi identity can be regarded as $N^2-1$ Abelian-like monopole currents in the continuum SU(N) QCD. Three Abelian-like monopoles, when defined in SU(2) gluodynamics on the lattice `{a} la DeGrand-Toussaint, are shown to have the continuum limit with respect to the color-invariant monopole density and the effective monopole action. Since each Abelian-like monopole is not gauge invariant, we have introduced various partial gauge fixing for the purpose of reducing lattice artifact monopoles in the thermalized vacuum. Here we investigate Abelian and monopole dominances and the Abelian dual Meissner effects adopting the same gauges like the maximal center gauge (MCG) in comparison with the maximal Abelian gauge (MAG). Abelian and monopole contributions to the string tension in these gauges are observed to be a little smaller than the non-Abelian string tension. However, we find that the monopole dominance is improved well when use is made of the block-spin transformations with respect to Abelian-like monopoles. We find each electric field is squeezed by the corresponding colored Abelian-like monopole in such gauges and the Abelian dual Meissner effect is observed independently for each color. Moreover, we confirm the dual Amp`{e}re's law in these new gauges as well as in MAG. The SU(2) vacuum is shown to be near the border between the type 1 and type 2 dual superconductors. The penetration length is almost equal for the four gauge fixings and the vacuum type in MCG is almost the same value as the previous results. These results are consistent with the previous results suggesting the continuum limit and the gauge-independence of Abelian monopoles.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80027702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Relativistic three-particle quantization condition for nondegenerate scalars 非简并标量的相对论三粒子量子化条件
arXiv: High Energy Physics - Lattice Pub Date : 2020-11-11 DOI: 10.1103/PHYSREVD.103.054503
T. Blanton, S. Sharpe
{"title":"Relativistic three-particle quantization condition for nondegenerate scalars","authors":"T. Blanton, S. Sharpe","doi":"10.1103/PHYSREVD.103.054503","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.054503","url":null,"abstract":"The formalism relating the relativistic three-particle infinite-volume scattering amplitude to the finite-volume spectrum has been developed thus far only for identical or degenerate particles. We provide the generalization to the case of three nondegenerate scalar particles with arbitrary masses. A key quantity in this formalism is the quantization condition, which relates the spectrum to an intermediate K matrix. We derive three versions of this quantization condition, each a natural generalization of the corresponding results for identical particles. In each case we also determine the integral equations relating the intermediate K matrix to the three-particle scattering amplitude, $mathcal M_3$. The version that is likely to be most practical involves a single Lorentz-invariant intermediate K matrix, $widetilde{mathcal K}_{rm df,3}$. The other versions involve a matrix of K matrices, with elements distinguished by the choice of which initial and final particles are the spectators. Our approach should allow a straightforward generalization of the relativistic approach to all other three-particle systems of interest.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86927389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Study of the axial U(1) anomaly at high temperature with lattice chiral fermions 晶格手性费米子高温下U(1)轴向异常的研究
arXiv: High Energy Physics - Lattice Pub Date : 2020-11-03 DOI: 10.1103/PHYSREVD.103.074506
S. Aoki, Y. Aoki, G. Cossu, H. Fukaya, S. Hashimoto, T. Kaneko, C. Rohrhofer, K. Suzuki
{"title":"Study of the axial \u0000U(1)\u0000 anomaly at high temperature with lattice chiral fermions","authors":"S. Aoki, Y. Aoki, G. Cossu, H. Fukaya, S. Hashimoto, T. Kaneko, C. Rohrhofer, K. Suzuki","doi":"10.1103/PHYSREVD.103.074506","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.074506","url":null,"abstract":"We investigate the axial U(1) anomaly of two-flavor QCD at temperatures 190--330 MeV. In order to preserve precise chiral symmetry on the lattice, we employ the Mobius domain-wall fermion action as well as overlap fermion action implemented with a stochastic reweighting technique. Compared to our previous studies, we reduce the lattice spacing to 0.07 fm, simulate larger multiple volumes to estimate finite size effect, and take more than four quark mass points, including one below physical point to investigate the chiral limit. We measure the topological susceptibility, axial U(1) susceptibility, and examine the degeneracy of U(1) partners in meson and baryon correlators. All the data above the critical temperature indicate that the axial U(1) violation is consistent with zero within statistical errors. The quark mass dependence suggests disappearance of the U(1) anomaly at a rate comparable to that of the SU(2)_L x SU(2)_R symmetry breaking.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87610938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Explorations beyond dilaton chiral perturbation theory in the eight-flavor SU(3) gauge theory 八味SU(3)规范理论中超越扩张手性微扰理论的探索
arXiv: High Energy Physics - Lattice Pub Date : 2020-09-29 DOI: 10.1103/physrevd.102.114507
M. Golterman, Y. Shamir
{"title":"Explorations beyond dilaton chiral perturbation theory in the eight-flavor SU(3) gauge theory","authors":"M. Golterman, Y. Shamir","doi":"10.1103/physrevd.102.114507","DOIUrl":"https://doi.org/10.1103/physrevd.102.114507","url":null,"abstract":"We continue our study of spectroscopy data for the SU(3) gauge theory with eight fundamental fermions, motivated by the effective field theory framework of dilaton chiral perturbation theory (dChPT). At leading order dChPT predicts a constant mass anomalous dimension $gamma_m$, consistent with the assumed proximity of an infrared fixed point. For the relatively large fermion masses simulated by the LatKMI collaboration, the influence of the infrared fixed point diminishes, and our fits suggest that $gamma_m$ starts running. Since a complete higher-order analysis is not feasible with presently available data, we adopt a more phenomenological approach. We propose a partial extension to higher orders, which incorporates the running of $gamma_m$ into the tree-level lagrangian. We find that this extension successfully describes the full fermion-mass range of the LatKMI data, including the pion taste splittings which arise from using staggered fermions in the lattice simulations. We also investigate a more general class of dilaton potentials proposed in the literature, using both the LSD and LatKMI data sets, concluding that these data favor the form predicted by dChPT.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88397121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Perturbative removal of a sign problem 符号问题的微扰去除
arXiv: High Energy Physics - Lattice Pub Date : 2020-09-23 DOI: 10.1103/physrevd.102.094504
S. Lawrence
{"title":"Perturbative removal of a sign problem","authors":"S. Lawrence","doi":"10.1103/physrevd.102.094504","DOIUrl":"https://doi.org/10.1103/physrevd.102.094504","url":null,"abstract":"This paper presents a method for alleviating sign problems in lattice path integrals, including those associated with finite fermion density in relativistic systems. The method makes use of information gained from some systematic expansion -- such as perturbation theory -- in order to accelerate the Monte Carlo. The method is exact, in the sense that no approximation to the lattice path integral is introduced. Thanks to the underlying systematic expansion, the method is systematically improvable, so that an arbitrary reduction in the sign problem can in principle be obtained. The Thirring model (in 0 + 1 and 1 + 1 dimensions) is used to demonstrate the ability of this method to reduce the finite-density sign problem.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84327257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Quenched Eguchi-Kawai model revisited 对淬灭Eguchi-Kawai模型的重新审视
arXiv: High Energy Physics - Lattice Pub Date : 2020-09-20 DOI: 10.1103/physrevd.102.094503
H. Neuberger
{"title":"Quenched Eguchi-Kawai model revisited","authors":"H. Neuberger","doi":"10.1103/physrevd.102.094503","DOIUrl":"https://doi.org/10.1103/physrevd.102.094503","url":null,"abstract":"The motivation and construction of the original Quenched Eguchi-Kawai model are reviewed, providing much greater detail than in the first, 1982 QEK paper. A 2008 article announced that QEK fails as a reduced model because the average over permutations of eigenvalues stays annealed. It is shown here that the original quenching logic naturally leads to a formulation with no annealed average over permutations.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78799440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Lattice $$ mathcal{N} $$ = 4 super Yang-Mills at strong coupling 晶格$$ mathcal{N} $$ = 4强耦合下的超级Yang-Mills
arXiv: High Energy Physics - Lattice Pub Date : 2020-09-15 DOI: 10.1007/jhep12(2020)140
S. Catterall, J. Giedt, G. Toga
{"title":"Lattice $$ mathcal{N} $$ = 4 super Yang-Mills at strong coupling","authors":"S. Catterall, J. Giedt, G. Toga","doi":"10.1007/jhep12(2020)140","DOIUrl":"https://doi.org/10.1007/jhep12(2020)140","url":null,"abstract":"","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72728027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Setting the scale for nHYP fermions with the Lüscher-Weisz gauge action 设置具有<s:1>舍-魏兹规范作用的nHYP费米子的尺度
arXiv: High Energy Physics - Lattice Pub Date : 2020-08-29 DOI: 10.1103/physrevd.102.094506
H. Niyazi, A. Alexandru, F. Lee, R. Brett
{"title":"Setting the scale for nHYP fermions with the Lüscher-Weisz gauge action","authors":"H. Niyazi, A. Alexandru, F. Lee, R. Brett","doi":"10.1103/physrevd.102.094506","DOIUrl":"https://doi.org/10.1103/physrevd.102.094506","url":null,"abstract":"Lattice QCD calculations using gauge smearing for fermion kernels are computationally efficient. Hypercubic blocking (nHYP smearing) has been shown to reduce scaling errors. In this work we use an improved action for $N_f=2$ QCD, based on the Luscher-Weisz gauge action and clover-improved Wilson fermions with nHYP smeared gauge links. We perform a parameter scan in the region with lattice spacing between $0.066 mathop{hbox{fm}}$ and $0.115 mathop{hbox{fm}}$ and pion mass between $207 mathop{hbox{MeV}}$ and $834 mathop{hbox{MeV}}$. \u0000We determine the lattice spacing and pion mass as a function of the bare coupling parameters ($beta$ and $kappa$). The results are obtained from twenty-two ensembles on a $24^3times 48$ lattice to percent level in statistical accuracy. The finite-volume effects for these ensemble are at the sub-percent level. From these measurements we produce easy-to-use parameterizations to help tune simulations with this action. The lattice spacing is fixed using a mass-independent procedure, by matching observables in the chiral limit. We also provide a parameterization for the chiral extrapolation which is universal and should hold for all discretizations of $N_f=2$ QCD.","PeriodicalId":8440,"journal":{"name":"arXiv: High Energy Physics - Lattice","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73657117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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