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Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)最新文献

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chiral condensate and suscptiblity of SU(2) $n_f=8$ naive staggered system SU(2) $n_f=8$幼稚交错体系的手性凝聚和磁化率
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-12-03 DOI: 10.22323/1.363.0034
I. Kanamori, C. Lin
{"title":"chiral condensate and suscptiblity of SU(2) $n_f=8$ naive staggered system","authors":"I. Kanamori, C. Lin","doi":"10.22323/1.363.0034","DOIUrl":"https://doi.org/10.22323/1.363.0034","url":null,"abstract":"The SU(2) gauge theory with 8 fundamental fermions is studied using unimproved staggered regularization. A phase transition or a crossover at strong coupling, which can be a bulk transition. By using chiral random matrix model we analyze the chiral condensate of this system. We also report the chiral susceptibility and its volume dependence near the transition point.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115374490","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: 0
Large $N_c$ behaviour of lattice QCD in the heavy dense regime 晶格QCD在重密区大$N_c$行为
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-12-03 DOI: 10.22323/1.363.0206
O. Philipsen, J. Scheunert
{"title":"Large $N_c$ behaviour of lattice QCD in the heavy dense regime","authors":"O. Philipsen, J. Scheunert","doi":"10.22323/1.363.0206","DOIUrl":"https://doi.org/10.22323/1.363.0206","url":null,"abstract":"Combining strong coupling and hopping expansion one can derive a dimensionally reduced effective theory of lattice QCD. This theory has a reduced sign problem, is amenable to analytic evaluation and was successfully used to study the cold and dense regime of QCD for sufficiently heavy quarks. We show results from the evaluation of the effective theory for arbitrary $N_c$ up to $kappa^4$. The inclusion of gauge corrections is also investigated. We find that the onset transition to finite baryon number density steepens with growing $N_c$ even for $T neq 0$. This suggests that in the large $N_c$ limit the onset transition is first order up to the deconfinement transition. Beyond the onset, the pressure is shown to scale as $p sim N_c$ through three orders in the hopping expansion, which is characteristic for a phase termed quarkyonic matter in the literature.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131105972","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
The Yang-Mills deconfinement transition from a high temperature expansion 高温膨胀引起的Yang-Mills非定界转变
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-12-03 DOI: 10.22323/1.363.0065
Jangho Kim, A. Q. Pham, O. Philipsen, J. Scheunert
{"title":"The Yang-Mills deconfinement transition from a high temperature expansion","authors":"Jangho Kim, A. Q. Pham, O. Philipsen, J. Scheunert","doi":"10.22323/1.363.0065","DOIUrl":"https://doi.org/10.22323/1.363.0065","url":null,"abstract":"The high temperature expansion is an analytical tool to study critical phenomena in statistical mechanics. We apply this method to 3d effective theories of Polyakov loops, which have been derived from 4d lattice Yang-Mills by means of resummed strong coupling expansions. In particular, the Polyakov loop susceptibility is computed as a power series in the effective couplings. A Pade analysis then provides the location of the phase transition in the effective theory, which can be mapped back to the parameters of 4d Yang-Mills. Our purely analytical results for the critical couplings $beta_c(N_tau)$ agree to better than $10%$ with those from Monte Carlo simulations. For the case of $SU(2)$, also the critical exponent $gamma$ is predicted accurately, while a first-order nature as for $SU(3)$ cannot be identified by a Pade analysis. The method can be generalized to include fermions and finite density.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"624 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116211485","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
Symmetries of the light hadron spectrum in high temperature QCD 高温QCD中光强子谱的对称性
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-12-02 DOI: 10.22323/1.363.0227
C. Rohrhofer, Y. Aoki, G. Cossu, H. Fukaya, C. Gattringer, L. Glozman, S. Hashimoto, C. Lang, K. Suzuki
{"title":"Symmetries of the light hadron spectrum in high temperature QCD","authors":"C. Rohrhofer, Y. Aoki, G. Cossu, H. Fukaya, C. Gattringer, L. Glozman, S. Hashimoto, C. Lang, K. Suzuki","doi":"10.22323/1.363.0227","DOIUrl":"https://doi.org/10.22323/1.363.0227","url":null,"abstract":"Properties of QCD matter change significantly around the chiral crossover temperature, and the effects on $U(1)_A$ and topological susceptibilities, as well as the meson spectrum have been studied with much care. Baryons and the effect of parity doubling in this temperature range have been analyzed previously by various other groups employing different setups. Here we construct suitable operators to investigate chiral and axial $U(1)_A$ symmetries in the baryon spectrum. Measurements for different volumes and quark-masses are done with two flavors of chirally symmetric domain-wall fermions at temperatures above the critical one. The possibility of emergent $SU(4)$ and $SU(2)_{CS}$ symmetries is discussed.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115223990","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: 2
Heavy quark momentum diffusion coefficient from the lattice 重夸克动量扩散系数从晶格
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-12-02 DOI: 10.22323/1.363.0108
N. Brambilla, V. Leino, P. Petreczky, A. Vairo
{"title":"Heavy quark momentum diffusion coefficient from the lattice","authors":"N. Brambilla, V. Leino, P. Petreczky, A. Vairo","doi":"10.22323/1.363.0108","DOIUrl":"https://doi.org/10.22323/1.363.0108","url":null,"abstract":"We report progress towards computing the heavy quark momentum diffusion coefficient from the lattice correlator of two chromoelectric fields attached to a Polyakov loop in pure SU(3) gauge theory. Using a multilevel algorithm and tree-level improvement, we study the behavior of the diffusion coefficient as a function of temperature in the wide range $1.1 < T/Tc < 10^4$.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131323009","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
On the $beta$- and quark mass dependence of the nuclear transition in the strong coupling regime 强耦合区核跃迁的$ β $-和夸克质量依赖
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-12-02 DOI: 10.22323/1.363.0064
Jangho Kim, O. Philipsen, W. Unger
{"title":"On the $beta$- and quark mass dependence of the nuclear transition in the strong coupling regime","authors":"Jangho Kim, O. Philipsen, W. Unger","doi":"10.22323/1.363.0064","DOIUrl":"https://doi.org/10.22323/1.363.0064","url":null,"abstract":"Lattice QCD in a dual formulation with staggered fermions is well established in the strong coupling limit and allows to perform Monte Carlo simulations at finite baryon chemical potential. We have recently addressed the dependence of the nuclear critical end point as a function of the quark mass $am_q$, and separately as a function of the lattice gauge coupling $beta$ in the chiral limit. Here we proceed to determine the dependence of the nuclear transition on both, $am_q$ and $beta$, on isotropic lattices and attempt to pinpoint the critical end point for various $beta$ where the sign problem is still manageable.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114219311","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: 2
Nucleon isovector couplings from 2+1 flavor lattice QCD at the physical point 物理点上2+1味晶格QCD的核子等矢量耦合
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-12-02 DOI: 10.22323/1.363.0132
Natsuki Tsukamoto, Y. Aoki, K. Ishikawa, Y. Kuramashi, E. Shintani, S. Sasaki, T. Yamazaki
{"title":"Nucleon isovector couplings from 2+1 flavor lattice QCD at the physical point","authors":"Natsuki Tsukamoto, Y. Aoki, K. Ishikawa, Y. Kuramashi, E. Shintani, S. Sasaki, T. Yamazaki","doi":"10.22323/1.363.0132","DOIUrl":"https://doi.org/10.22323/1.363.0132","url":null,"abstract":"We present results on the axial, scalar and tensor isovector-couplings of the nucleon from 2+1 flavor lattice QCD with physical light quarks ($m_pi$ = 135 MeV) in large spatial volume of (10.8 fm)$^3$. The calculations are carried out with the PACS10 gauge configurations generated by the PACS Collaboration with the stout-smeared $mathcal{O}(a)$ improved Wilson fermions and Iwasaki gauge action at $beta=1.82$ corresponding to the lattice spacing of 0.084 fm. For the renormalization, we use the RI/SMOM scheme, a variant of Rome-Southampton RI/MOM scheme with reduced systematic errors, as the intermediate scheme. We then evaluate our final results in the $overline{rm MS}$ scheme at a scale of 2 GeV, using the continuum perturbation theory for the matching scale of RI/SMOM and $overline{rm MS}$ schemes and running.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127857347","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: 2
Lattice QCD estimate of the quark-gluon plasma photon emission rate 夸克-胶子等离子体光子发射速率的点阵QCD估计
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-12-01 DOI: 10.22323/1.363.0225
B. Brandt, M. Cè, A. Francis, T. Harris, H. Meyer, A. Steinberg, Arianna Toniato
{"title":"Lattice QCD estimate of the quark-gluon plasma photon emission rate","authors":"B. Brandt, M. Cè, A. Francis, T. Harris, H. Meyer, A. Steinberg, Arianna Toniato","doi":"10.22323/1.363.0225","DOIUrl":"https://doi.org/10.22323/1.363.0225","url":null,"abstract":"We present a computation of the photon emission rate of the quark-gluon plasma from two-flavor lattice QCD at a temperature of 254 MeV, which follows up on the work presented in [1]. We perform a continuum extrapolation of the vector-current correlator, and consider a linear combination of the Lorentz indices corresponding to a UV-finite spectral function. To extract the spectral function from the lattice correlators, an ill-posed inverse problem, we model the spectral function with a Pade ansatz. We further constrain our analysis by simultaneously fitting data with different momenta. We present results for a multi-momentum fit including the three smallest momenta available from our lattice analysis.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125986550","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: 6
Exploring the QCD phase diagram at finite density by the complex Langevim method on a $16^3times32$ lattice 用复Langevim方法在$16^3times32$晶格上探索有限密度下的QCD相图
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-12-01 DOI: 10.22323/1.363.0151
S. Tsutsui, Yuta Ito, H. Matsufuru, J. Nishimura, Shinji Shimasaki, A. Tsuchiya
{"title":"Exploring the QCD phase diagram at finite density by the complex Langevim method on a $16^3times32$ lattice","authors":"S. Tsutsui, Yuta Ito, H. Matsufuru, J. Nishimura, Shinji Shimasaki, A. Tsuchiya","doi":"10.22323/1.363.0151","DOIUrl":"https://doi.org/10.22323/1.363.0151","url":null,"abstract":"We explore the QCD phase diagram at finite density with four-flavor staggered fermions using the complex Langevin method, which is a promising approach to overcome the sign problem. In our previous work on an $8^3times16$ lattice at $beta=5.7$ with the quark mass $m= 0.01$, we have found that the baryon number density has a clear plateau as a　function of the chemical potential. In this study, we use a $16^3times32$ lattice to reduce finite volume effects and find that the plateau structure survives. Moreover, the number of quarks in the plateau region turns out to be 24, which is exactly the same as the one obtained previously on the $8^3times16$ lattice. We provide a simple interpretation of this number, which suggests that the Fermi sphere is starting to form.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127230033","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
The energy-momentum tensor in lattice QCD and the Equation of State 点阵QCD中的能量-动量张量与状态方程
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019) Pub Date : 2019-11-29 DOI: 10.22323/1.363.0041
M. D. Brida, L. Giusti, M. Pepe
{"title":"The energy-momentum tensor in lattice QCD and the Equation of State","authors":"M. D. Brida, L. Giusti, M. Pepe","doi":"10.22323/1.363.0041","DOIUrl":"https://doi.org/10.22323/1.363.0041","url":null,"abstract":"We present a new theoretical and practical strategy to renormalize non-perturbatively the energy-momentum tensor in lattice QCD based on the framework of shifted boundary conditions. As a preparatory step for the fully non-perturbative calculation, we apply the strategy at 1-loop order in perturbation theory determining the renormalization constants of both the gluonic and the fermionic components of the energy-momentum tensor. Using shifted boundary conditions, the entropy density of QCD is directly related to the expectation value of the space-time components of the renormalized energy-momentum tensor. We then discuss its practical implementation by numerical simulations of QCD with 3 flavours of Wilson quarks for temperatures between 2.5 GeV and 80 GeV.","PeriodicalId":147987,"journal":{"name":"Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124784239","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: 0
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