SciPost Physics最新文献_第2页

RG flows in de Sitter: C-functions and sum rules 德西特中的 RG 流C 函数与和规则

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-12 DOI: 10.21468/scipostphys.17.3.079

Manuel Loparco

{"title":"RG flows in de Sitter: C-functions and sum rules","authors":"Manuel Loparco","doi":"10.21468/scipostphys.17.3.079","DOIUrl":"https://doi.org/10.21468/scipostphys.17.3.079","url":null,"abstract":"We study the renormalization group flow of unitary Quantum Field Theories on two-dimensional de Sitter (dS) spacetime. We prove the existence of two functions of the radius of dS that interpolate between the central charges of the UV and IR fixed points of the flow when tuning the radius $R$ while keeping the mass scales fixed. The first is constructed from certain components of the two-point function of the stress tensor evaluated at antipodal separation. The second is the spectral weight of the stress tensor in the $Delta=2$ discrete series. This last fact implies that the stress tensor of any unitary QFT in dS$_2$ must interpolate between the vacuum and states in the $Delta=2$ discrete series irrep. We verify that the c-functions are monotonic for intermediate radii in the free massive boson and free massive fermion theories, but we lack a general proof of said monotonicity. We derive a variety of sum rules that relate the central charges and the c-functions to integrals of the two-point function of the trace of the stress tensor and to integrals of its spectral densities. The positivity of these formulas implies $c^{UV}≥ c^{IR}$. In the infinite radius limit the sum rules reduce to the well known formulas in flat space. Throughout the paper, we prove some general properties of the spectral decomposition of the stress tensor in dS$_{d+1}$.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"2 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lorentzian contours for tree-level string amplitudes 树级弦振幅的洛伦兹等值线

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-11 DOI: 10.21468/scipostphys.17.3.078

Lorenz Eberhardt, Sebastian Mizera

引用次数: 0

On a $mathbb{Z}_3$-valued discrete topological term in 10d heterotic string theories 关于 10d 异质弦理论中的 $mathbb{Z}_3$ 值离散拓扑项

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-11 DOI: 10.21468/scipostphys.17.3.077

Yuji Tachikawa, Hao Zhang

引用次数: 0

Unraveling complexity: Singular value decomposition in complex experimental data analysis 揭示复杂性：复杂实验数据分析中的奇异值分解

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-11 DOI: 10.21468/scipostphyscore.7.3.061

Judith F. Stein, Aviad Frydman, Richard Berkovits

引用次数: 0

Suppression of the superfluid Kelvin-Helmholtz instability due to massive vortex cores, friction and confinement 大质量涡核、摩擦和约束对超流体开尔文-赫尔姆霍兹不稳定性的抑制

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-10 DOI: 10.21468/scipostphys.17.3.076

Matteo Caldara, Andrea Richaud, Massimo Capone, Pietro Massignan

引用次数: 0

An introduction to infinite projected entangled-pair state methods for variational ground state simulations using automatic differentiation 利用自动微分进行变异基态模拟的无限投影纠缠对态方法简介

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-10 DOI: 10.21468/scipostphyslectnotes.86

Jan Naumann, Erik Lennart Weerda, Matteo Rizzi, Jens Eisert, Philipp Schmoll

{"title":"An introduction to infinite projected entangled-pair state methods for variational ground state simulations using automatic differentiation","authors":"Jan Naumann, Erik Lennart Weerda, Matteo Rizzi, Jens Eisert, Philipp Schmoll","doi":"10.21468/scipostphyslectnotes.86","DOIUrl":"https://doi.org/10.21468/scipostphyslectnotes.86","url":null,"abstract":"Tensor networks capture large classes of ground states of phases of quantum matter faithfully and efficiently. Their manipulation and contraction has remained a challenge over the years, however. For most of the history, ground state simulations of two-dimensional quantum lattice systems using (infinite) projected entangled pair states have relied on what is called a time-evolving block decimation. In recent years, multiple proposals for the variational optimization of the quantum state have been put forward, overcoming accuracy and convergence problems of previously known methods. The incorporation of automatic differentiation in tensor networks algorithms has ultimately enabled a new, flexible way for variational simulation of ground states and excited states. In this work we review the state-of-the-art of the variational iPEPS framework, providing a detailed introduction to automatic differentiation, a description of a general foundation into which various two-dimensional lattices can be conveniently incorporated, and demonstrative benchmarking results.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"8 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Markovian to non-Markovian phase transition in the operator dynamics of a mobile impurity 移动杂质算子动力学中的马尔可夫相变到非马尔可夫相变

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-09 DOI: 10.21468/scipostphyscore.7.3.060

Dominic Gribben, Jamir Marino, Shane P. Kelly

{"title":"Markovian to non-Markovian phase transition in the operator dynamics of a mobile impurity","authors":"Dominic Gribben, Jamir Marino, Shane P. Kelly","doi":"10.21468/scipostphyscore.7.3.060","DOIUrl":"https://doi.org/10.21468/scipostphyscore.7.3.060","url":null,"abstract":"We study a random unitary circuit model of an impurity moving through a chaotic medium. The exchange of information between the medium and impurity is controlled by varying the velocity of the impurity, $v_d$, relative to the speed of information propagation within the medium, $v_B$. Above supersonic velocities, $v_d> v_B$, information cannot flow back to the impurity after it has moved into the medium, and the resulting dynamics are Markovian. Below supersonic velocities, $v_d< v_B$, the dynamics of the impurity and medium are non-Markovian, and information is able to flow back onto the impurity. We show the two regimes are separated by a continuous phase transition with exponents directly related to the diffusive spreading of operators in the medium. This is demonstrated by monitoring an out-of-time-order correlator (OTOC) in a scenario where the impurity is substituted at an intermediate time. During the Markovian phase, information from the medium cannot transfer onto the replaced impurity, manifesting in no significant operator development. Conversely, in the non-Markovian phase, we observe that operators acquire support on the newly introduced impurity. We also characterize the dynamics using the coherent information and provide two decoders which can efficiently probe the transition between Markovian and non-Markovian information flow. Our work demonstrates that Markovian and non-Markovian dynamics can be separated by a phase transition, and we propose an efficient protocol for observing this transition.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"28 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Adiabatic gauge potential and integrability breaking with free fermions 绝热规势与自由费米子的可整性突破

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-09 DOI: 10.21468/scipostphys.17.3.075

Balázs Pozsgay, Rustem Sharipov, Anastasiia Tiutiakina, István Vona

引用次数: 0

Flux-tunable hybridization in a double quantum dot interferometer 双量子点干涉仪中的通量可调杂化

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-06 DOI: 10.21468/scipostphys.17.3.074

Christian Prosko, Ivan Kulesh, Michael Chan, Lin Han, Di Xiao, Candice Thomas, Michael Manfra, Srijit Goswami, Filip K. Malinowski

引用次数: 0

Coulomb branch surgery: Holonomy saddles, S-folds and discrete symmetry gaugings 库仑分支手术：整体性鞍座、S 折叠和离散对称规

IF 5.5 2区物理与天体物理

SciPost Physics Pub Date : 2024-09-05 DOI: 10.21468/scipostphys.17.3.073

Elias Furrer, Horia Magureanu

{"title":"Coulomb branch surgery: Holonomy saddles, S-folds and discrete symmetry gaugings","authors":"Elias Furrer, Horia Magureanu","doi":"10.21468/scipostphys.17.3.073","DOIUrl":"https://doi.org/10.21468/scipostphys.17.3.073","url":null,"abstract":"Symmetries of Seiberg–Witten (SW) geometries capture intricate physical aspects of the underlying 4d $mathcal{N} = 2$ field theories. For rank-one theories, these geometries are rational elliptic surfaces whose automorphism group is a semi-direct product between the Coulomb branch (CB) symmetries and the Mordell-Weil group. We study quotients of the SW geometry by subgroups of its automorphism group, which most naturally become gaugings of discrete 0- and 1-form symmetries. Yet, new interpretations of these surgeries become evident when considering 5d $mathcal{N}=1$ superconformal field theories. There, certain CB symmetries are related to symmetries of the corresponding $(p,q)$-brane web and, as a result, CB surgeries can give rise to (fractional) S-folds. Another novel interpretation of these quotients is the folding across dimensions: circle compactifications of the 5d $E_{2N_f + 1}$ Seiberg theories lead in the infrared to two copies of locally indistinguishable 4d SU(2) SQCD theories with $N_f$ fundamental flavours. This extends earlier results on holonomy saddles, while also reproducing detailed computations of 5d BPS spectra and predicting new 5d and 6d BPS quivers. Finally, we argue that the semi-direct product structure of the automorphism group of the SW geometry includes mixed 't Hooft anomalies between the 0- and 1-form symmetries, and we also present some new results on non-cyclic CB symmetries.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"38 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0