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DTSTART;TZID=America/New_York:20240308T090000
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DTSTAMP:20260414T112624
CREATED:20240305T204031Z
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UID:10001510-1709888400-1709892000@cmsa.fas.harvard.edu
SUMMARY:A model for studying the sign problem on quantum computers: Z(3) gauge theory with three fermion flavors in 1+1 dimensions
DESCRIPTION:Quantum Matter in Mathematics and Physics Seminar \nSpeaker: Semeon Valgushev (Iowa State University) \nTitle: A model for studying the sign problem on quantum computers: Z(3) gauge theory with three fermion flavors in 1+1 dimensions \nAbstract: Many properties of quantum field theories can be understood with the help of classical numerical methods. Yet there are several outstanding problems — most remarkably the behaviour of nuclear matter at finite density and out-of-equilibrium real-time dynamics — that require the use of quantum algorithms. We present a simple yet physically rich toy model of QCD/nuclear matter at finite density\, termed “QZD”\, where Z stands for Z(3) gauge theory coupled to Nf = 3 fermion flavors\, suitable for simulation on near-term quantum devices. We study it using tensor networks and find that in weak coupling the spectrum is that of the expected mesons and baryons\, although the corrections in weak coupling are nontrivial. In strong coupling\, besides the usual baryon\, the singlet meson is a baryon anti-baryon state. For two special values of the coupling constant\, the lightest baryon is degenerate with the lightest octet meson\, and the lightest singlet meson\, respectively.
URL:https://cmsa.fas.harvard.edu/event/qm-3824/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/1709829554146-a2e594b2-ba0b-4248-bd23-63c7f0f9e199docx_1-1.png
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240313T100000
DTEND;TZID=America/New_York:20240313T123000
DTSTAMP:20260414T112624
CREATED:20240311T201438Z
LAST-MODIFIED:20240813T161117Z
UID:10002908-1710324000-1710333000@cmsa.fas.harvard.edu
SUMMARY:Cluster state as a noninvertible SPT phase
DESCRIPTION:Quantum Matter in Mathematics and Physics Seminar \nSpeaker: Shu-Heng Shao (SUNY Stony Brook) \nTitle: Cluster state as a noninvertible SPT phase\n \nAbstract: We will point out a non-invertible symmetry of the ordinary 1+1d Z2xZ2 cluster Hamiltonian. Therefore\, the cluster state can be viewed as a non-invertible SPT phase under this fusion category symmetry\, which is Rep(D8). We furthermore find two new stabilizer states that are distinct from the cluster state as Rep(D8) SPT phases\, but identical as Z2xZ2 SPT phases. Finally\, we discuss the degenerate edge modes at the interfaces between these three Rep(D8) SPT phases. 
URL:https://cmsa.fas.harvard.edu/event/qm_31324/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QMMP-08.13.2024.docx-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240315T100000
DTEND;TZID=America/New_York:20240315T113000
DTSTAMP:20260414T112624
CREATED:20240311T164549Z
LAST-MODIFIED:20240311T164549Z
UID:10002907-1710496800-1710502200@cmsa.fas.harvard.edu
SUMMARY:Monopoles\, scattering\, generalized symmetries
DESCRIPTION:Quantum Matter in Mathematics and Physics Seminar \nSpeaker: Diego Delmastro (Simons Center for Geometry and Physics) \nTitle: Monopoles\, scattering\, generalized symmetries\n \nAbstract: Gauge theory is a very mature subject by now. Surprisingly\, some of its symmetries have only been properly understood in the last couple of years. Specifically\, such theories typically have a very rich set of symmetries\, involving modern notions such as higher-form symmetries\, higher-group symmetries\, and categorical symmetries. A proper understanding of these generalized symmetries is not really crucial if we are interested in scattering processes involvingfundamental particles only\, but it does become quite essential if we want to add monopoles into the mix.  In this talk I will review where these generalized symmetries come from\, and how they impose constraints on scattering amplitudes of elementary particles against heavy monopoles. This will allow us to resolve a decades-old puzzle concerning such processes\, where incoming electrons appear to become fractional particles after the scattering event.
URL:https://cmsa.fas.harvard.edu/event/monopoles-scattering-generalized-symmetries/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/1710175391273-1be4453c-8fc6-4e08-84f5-51bec5d04ec1docx_1-2.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240322T090000
DTEND;TZID=America/New_York:20240322T103000
DTSTAMP:20260414T112624
CREATED:20240318T135251Z
LAST-MODIFIED:20240318T141920Z
UID:10001511-1711098000-1711103400@cmsa.fas.harvard.edu
SUMMARY:Non-Invertible Peccei-Quinn Symmetry and the Massless Quark Solution to the Strong CP Problem
DESCRIPTION:Quantum Matter in Mathematics and Physics Seminar \nSpeaker: Sungwoo Hong\, Korea Advanced Institute of Science and Technology (KAIST) \nTitle: Non-Invertible Peccei-Quinn Symmetry and the Massless Quark Solution to the Strong CP Problem \nAbstract: In this talk\, I will discuss a new solution to the strong CP problem\, one of the most important and challenging problems\, of the Standard Model (SM) based on the generalized global symmetry. To this end\, I will first show that there exist non-invertible chiral symmetries acting on quark fields once the SM is extended with gauged quark flavor symmetry. Interestingly enough\, such symmetries\, which we named them as “non-invertible Peccei-Quinn symmetries”\, exist only because the SM has the same number of generations as colors\, yet another feature that deserves a fundamental explanation. Then I discuss how these new generalized symmetries set the down Yukawa to be exactly zero and lead to a massless quark solution to the strong CP problem. Completion of the solution requires (i) generation of down quark Yukawas to be consistent with both observed quark mass spectrum and mixings and (ii) generation of O(1) CP violating phase called CKM phase\, crucially without destabilizing our solution to the strong CP problem. I will discuss that these rather non-trivial tasks can be achieved by a UV completion in an SU(9) quark color-flavor unification.
URL:https://cmsa.fas.harvard.edu/event/qm-32224/
LOCATION:Virtual
CATEGORIES:Quantum Matter
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-QMMP-03.22.2024.png
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