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X-WR-CALDESC:Events for CMSA
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220518T160000
DTEND;TZID=America/New_York:20220518T173000
DTSTAMP:20240813T162341Z
CREATED:20240215T101105Z
LAST-MODIFIED:20240813T162341Z
UID:10002739-1652889600-1652895000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Boundary conditions and LSM anomalies of conformal field theories in 1+1 dimensions
DESCRIPTION:Speaker: Linhao Li (ISSP\, U Tokyo) \nTitle: Boundary conditions and LSM anomalies of conformal field theories in 1+1 dimensions \nAbstract: In this talk\, we will study a relationship between conformally invariant boundary conditions and anomalies of conformal field theories (CFTs) in 1+1 dimensions. For a given CFT with a global symmetry\, we consider symmetric gapping potentials which are relevant perturbations to the CFT. If a gapping potential is introduced only in a subregion of the system\, it provides a certain boundary condition to the CFT. From this equivalence\, if there exists a Cardy boundary state which is invariant under a symmetry\, then the CFT can be gapped with a unique ground state by adding the corresponding gapping potential. This means that the symmetry of the CFT is anomaly free. Using this approach\, we will systematically deduce the anomaly-free conditions for various types of CFTs with several different symmetries. When the symmetry of the CFT is anomalous\, it implies a Lieb-Schultz-Mattis type ingappability of the system. Our results are consistent with\, where available\, known results in the literature. Moreover\, we extend the discussion to other symmetries including spin groups and generalized time-reversal symmetries. As an application\, we propose 1d LSM theorem involving magnetic space group symmetries on the lattice. The extended LSM theorems apply to systems with a broader class of spin interactions\, such as Dzyaloshinskii-Moriya interactions and chiral three-spin interactions.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/5-18-2022-quantum-matter-in-mathematics-and-physics-2/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/jpeg:https://live-hu-cmsa-222.pantheonsite.io/media/CMSA-QMMP-Seminar-05.18.22-1583x2048-1.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220525T103000
DTEND;TZID=America/New_York:20220525T120000
DTSTAMP:20240215T102153Z
CREATED:20240215T101805Z
LAST-MODIFIED:20240215T102153Z
UID:10002740-1653474600-1653480000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Oblique Lessons from the W Mass Measurement at CDF II
DESCRIPTION:Speaker: Seth Koren (University of Chicago) \nTitle: Baryon Minus Lepton Number BF Theory for the Cosmological Lithium Problem \nAbstract: The cosmological lithium problem—that the observed primordial abundance is lower than theoretical expectations by order one—is perhaps the most statistically significant anomaly of SM+ ΛCDM\, and has resisted decades of attempts by cosmologists\, nuclear physicists\, and astronomers alike to root out systematics. We upgrade a discrete subgroup of the anomaly-free global symmetry of the SM to an infrared gauge symmetry\, and UV complete this at a scale Λ as the familiar U(1)_{B-N_cL} Abelian Higgs theory. The early universe phase transition forms cosmic strings which are charged under the emergent higher-form symmetry of the baryon minus lepton BF theory. These topological defects catalyze interactions which turn N_g baryons into N_g leptons at strong scale rates in an analogue of the Callan-Rubakov effect\, where N_g=3 is the number of SM generations. We write down a model in which baryon minus lepton strings superconduct bosonic global baryon plus lepton number currents and catalyze solely 3p^+ → 3e^+. We suggest that such cosmic strings have disintegrated O(1) of the lithium nuclei formed during Big Bang Nucleosynthesis and estimate the rate\, with our benchmark model finding Λ ~ 10^8 GeV gives the right number density of strings.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/qm_51222/
LOCATION:Hybrid
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/CMSA-QMMP-Seminar-05.25.22.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220707T103000
DTEND;TZID=America/New_York:20220707T123000
DTSTAMP:20240229T091815Z
CREATED:20240215T100432Z
LAST-MODIFIED:20240229T091815Z
UID:10002737-1657189800-1657197000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Anomalies\, dynamics and phases in strongly-coupled chiral gauge theories: Recent developments
DESCRIPTION:Speaker: Kenichi Konishi (UNIPI.IT) \nTitle: Anomalies\, dynamics and phases in strongly-coupled chiral gauge theories: Recent developments \nAbstract: After many years of efforts\, still very little is known today about the physics of strongly-coupled chiral gauge theories in four dimensions\, in spite of an important role they might play in the physics of fundamental interactions beyond the standard SU(3)xSU(2)xU(1) model. This is in stark contrast with the vectorlike gauge theories for which we have many solid results\, thanks to some exact theorems\, to the lattice simulation studies\, to the Seiberg-Witten exact solution of N=2 supersymmetric gauge theories\, and last\, but not the least\, to the real-world strong-interaction phenomenology and experimental tests of Quantum Chromodynamics. \nThe purpose of this seminar is to discuss the results of our recent efforts to improve the understanding of the strongly-coupled chiral gauge theories. Among the main tools of analysis are the consideration of anomalies. We use both the conventional ’t Hooft anomaly-matching ideas\, and new\, more stringent constraints coming from the generalized anomalies involving some higher-form symmetries. Also\, the so-called strong anomalies\, little considered in the context of chiral gage theories\, are found to carry significant implications. \nAs the playground we study several classes of SU(N) gauge theories\, the so-called Bars-Yankielowicz models\, the generalized Georgi-Glashow models\, as well as a few other simple theories with the fermions in complex\, anomaly-free representations of the color SU(N). \nColor-flavor-locked dynamical Higgs phase and dynamical Abelianization\, emerge\, among others\, as two particularly interesting possible phases the system can flow into in the infrared\, depending on the matter fermion content of the model.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/qm_7722/
LOCATION:Virtual
CATEGORIES:Quantum Matter
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220816T100000
DTEND;TZID=America/New_York:20220816T113000
DTSTAMP:20240229T092227Z
CREATED:20240215T100758Z
LAST-MODIFIED:20240229T092227Z
UID:10002738-1660644000-1660649400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Transport in large-N critical Fermi surface
DESCRIPTION:Speaker: Haoyu Guo (Harvard) \nTitle: Transport in large-N critical Fermi surface\n\nAbstract: A Fermi surface coupled to a scalar field can be described in a 1/N expansion by choosing the fermion-scalar Yukawa coupling to be random in the N-dimensional flavor space\, but invariant under translations. We compute the conductivity of such a theory in two spatial dimensions for a critical scalar. We find a Drude contribution\, and show that a previously proposed \omega^{-2/3} contribution to the optical conductivity at frequency \omega has vanishing co-efficient. We also describe the influence of impurity scattering of the fermions\, and find that while the self energy resembles a marginal Fermi liquid\, the resistivity behaves like a Fermi liquid. Arxiv references: 2203.04990\, 2207.08841
URL:https://live-hu-cmsa-222.pantheonsite.io/event/qm_81622/
LOCATION:Virtual
CATEGORIES:Quantum Matter
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220907T090000
DTEND;TZID=America/New_York:20220907T103000
DTSTAMP:20240229T105716Z
CREATED:20240216T115218Z
LAST-MODIFIED:20240229T105716Z
UID:10002769-1662541200-1662546600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Gifts from anomalies: new results on quantum critical transport in non- Fermi liquids
DESCRIPTION:Quantum Matter in Mathematics and Physics Seminar \nSpeaker: Zhengyan Darius Shi (MIT)\n\n\nTitle: Gifts from anomalies: new results on quantum critical transport in non-Fermi liquids\nAbstract: Non-Fermi liquid phenomena arise naturally near Landau ordering transitions in metallic systems. Here\, we leverage quantum anomalies as a powerful nonperturbative tool to calculate optical transport in these models in the infrared limit. While the simplest such models with a single boson flavor (N=1) have zero incoherent conductivity\, a recently proposed large N deformation involving flavor-random Yukawa couplings between N flavors of bosons and fermions admits a nontrivial incoherent conductivity  (z is the boson dynamical exponent) when the order parameter is odd under inversion. The presence of incoherent conductivity in the random flavor model is a consequence of its unusual anomaly structure. From this we conclude that the large N deformation does not share important nonperturbative features with the physical N = 1 model\, though it remains an interesting theory in its own right. Going beyond the IR fixed point\, we also consider the effects of irrelevant operators and show\, within the scope of the RPA expansion\, that the old result   due to Kim et al. is incorrect for inversion-odd order parameters.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/gifts-from-anomalies-new-results-on-quantum-critical-transport-in-non-fermi-liquids/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/CMSA-QMMP-Seminar-09.07.22-1-2.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220913T093000
DTEND;TZID=America/New_York:20220913T110000
DTSTAMP:20240229T105748Z
CREATED:20240216T114850Z
LAST-MODIFIED:20240229T105748Z
UID:10002768-1663061400-1663066800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Non-invertible Symmetries in Nature
DESCRIPTION:Quantum Matter in Mathematics and Physics \n\nSpeaker: Yichul Cho (SUNY Stony Brook)\nTitle: Non-invertible Symmetries in Nature \nAbstract: In this talk\, I will discuss non-invertible symmetries in\nfamiliar 3+1d quantum field theories describing our Nature. In\nmassless QED\, the classical U(1) axial symmetry is not completely\nbroken by the ABJ anomaly. Instead\, it turns into a discrete\,\nnon-invertible symmetry. The non-invertible symmetry operator is\nobtained by dressing the naïve U(1) axial symmetry operator with a\nfractional quantum Hall state. We also find a similar non-invertible\nsymmetry in the massless limit of QCD\, which provides an alternative\nexplanation for the neutral pion decay. In the latter part of the\ntalk\, I will discuss non-invertible time-reversal symmetries in 3+1d\ngauge theories. In particular\, I will show that in free Maxwell\ntheory\, there exists a non-invertible time-reversal symmetry at every\nrational value of the theta angle. \nBased on https://arxiv.org/abs/2205.05086 and https://arxiv.org/abs/2208.04331. \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/non-invertible-symmetries-in-nature/
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/CMSA-QMMP-Seminar-09.13.22-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220926T090000
DTEND;TZID=America/New_York:20220926T103000
DTSTAMP:20240229T110730Z
CREATED:20240216T113233Z
LAST-MODIFIED:20240229T110730Z
UID:10002766-1664182800-1664188200@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Candidates for Non-Supersymmetric Dualities
DESCRIPTION:Quantum Matter in Mathematics and Physics \nSpeaker: Avner Karasik (University of Cambridge\, UK)\nTitle: Candidates for Non-Supersymmetric Dualities \nAbstract: In the talk I will discuss the possibility and the obstructions of finding non-supersymmetric dualities for 4d gauge theories. I will review consistency conditions based on Weingarten inequalities\, anomalies and large N\, and clarify some subtle points and misconceptions about them. Later I will go over some old and new examples of candidates for non-supersymmetric dualities. The will be based on 2208.07842 \n 
URL:https://live-hu-cmsa-222.pantheonsite.io/event/non-invertible-symmetries-in-nature-2/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/CMSA-QMMP-Seminar-09.26.22.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20221004T093000
DTEND;TZID=America/New_York:20221004T110000
DTSTAMP:20240813T162619Z
CREATED:20240216T090303Z
LAST-MODIFIED:20240813T162619Z
UID:10002752-1664875800-1664881200@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Holomorphic Twists and Confinement in N=1 SYM
DESCRIPTION:Quantum Matter Seminar \nSpeaker: Justin Kulp (Perimeter Institute) \nTitle: Holomorphic Twists and Confinement in N=1 SYM \nAbstract: Supersymmetric QFT’s are of long-standing interest for their high degree of solvability\, phenomenological implications\, and rich connections to mathematics. In my talk\, I will describe how the holomorphic twist isolates the protected quantities which give SUSY QFTs their potency by restricting to the cohomology of one supercharge. I will briefly introduce infinite dimensional symmetry algebras\, generalizing Virasoro and Kac-Moody symmetries\, which emerge. Finally\, I will explain a potential novel UV manifestation of confinement\, dubbed “holomorphic confinement\,” in the example of pure SU(N) super Yang-Mills. Based on arXiv:2207.14321 and 2 forthcoming works with Kasia Budzik\, Davide Gaiotto\, Brian Williams\, Jingxiang Wu\, and Matthew Yu.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/qm_tba/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/CMSA-QMMP-Seminar-10.04.22.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20221017T090000
DTEND;TZID=America/New_York:20221017T103000
DTSTAMP:20240229T101247Z
CREATED:20240215T104548Z
LAST-MODIFIED:20240229T101247Z
UID:10002745-1665997200-1666002600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Topological Wick Rotation and Holographic duality
DESCRIPTION:Quantum Matter Seminar \nSpeaker: Liang Kong (Sustech) \nTitle: Topological Wick Rotation and Holographic duality \nAbstract: I will explain a new type of holographic dualities between\nn+1D topological orders with a chosen boundary condition and nD\n(potentially gapless) quantum liquids. It is based on the idea of\ntopological Wick rotation\, a notion which was first used in\narXiv:1705.01087 and was named\, emphasized and generalized later in\narXiv:1905.04924. Examples of these holographic dualities include the\nduality between 2+1D toric code model and 1+1D Ising chain and its\nfinite-group generalizations (independently discovered by many\nothers); those between 2+1D topological orders and 1+1D rational\nconformal field theories; and those between n+1D finite gauge theories\nwith a gapped boundary and nD gapped quantum liquids. I will also\nbriefly discuss some generalizations of this holographic duality and\nits relation to AdS/CFT duality.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/qm_101722/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/CMSA-QMMP-Seminar-10.17.2022.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20221018T090000
DTEND;TZID=America/New_York:20221018T103000
DTSTAMP:20240229T093815Z
CREATED:20240215T104318Z
LAST-MODIFIED:20240229T093815Z
UID:10002744-1666083600-1666089000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:On the six-dimensional origin of non-invertible symmetries
DESCRIPTION:Quantum Matter Seminar \nSpeaker: Michele Del Zotto (Uppsala University) \nTitle: On the six-dimensional origin of non-invertible symmetries \nAbstract: I will present a review about recent progress in charting non-invertible symmetries for four-dimensional quantum field theories that have a six-dimensional origin. These include in particular N=4 supersymmetric Yang-Mills theories\, and also a large class of N=2 supersymmetric theories which are conformal and do not have a conventional Lagrangian description (the so-called theories of “class S”). Among the main results\, I will explain criteria for identifying examples of system