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en<span ng-non-bindable>BLACK IN PHYSICS WEEK https://www.blackinphysics.org/</span>
https://www.physics.harvard.edu/physics-3
Tue, 27 Oct 2020 13:59:33 +0000webmaster1536194 at https://www.physics.harvard.edu<span ng-non-bindable>Monday Colloquium: Leonard Susskind (Stanford University) "Some thoughts about string theory and the world"</span>
https://www.physics.harvard.edu/event/monday-colloquium-leonard-susskind-stanford-university-some-thoughts-about-string
I will give you my perspective on where we are with respect to quantum gravity, string theory, and the so-called real world.Mon, 26 Oct 2020 20:30:00 +0000clayman1536113 at https://www.physics.harvard.edu<span ng-non-bindable>Superspreading Events Without Superspreaders</span>
https://www.physics.harvard.edu/news/superspreading-events-without-superspreaders
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Is a study posted on medRxiv, Prof. Mara Prentiss and two former Harvard physics students, Arthur Chu and Karl Berggren (MIT), analyzed transmission of COVID-19 using five well-documented case studies: a Washington state church choir, a Korean call center, a Korean exercise class, and two different Chinese bus trips. In all cases the likely index patients were pre-symptomatic or mildly symptomatic, which is when infective patients are most likely to interact with large groups of people. An estimate of <em>N</em><sub>0</sub>, the characteristic number of COVID-19 virions needed to induce infection in each case, was calculated using a simple physical model of airborne transmission. The researchers found that the <em>N</em><sub>0</sub> values are similar for five COVID-19 superspreading cases (~300-2,000 viral copies) and of the same order as influenza A. These results suggest that viral loads relevant to infection from presymptomatic or mildly symptomatic individuals may fall into a narrow range, and that exceptionally high viral loads are not required to induce a superspreading event. Rather, t he accumulation of infective aerosols exhaled by a typical pre-symptomatic or mildly symptomatic patient in a confined, crowdedspace (amplified by poor ventilation, particularly activity like exercise or singing, or lack of masks) for exposure times as short as one hour are sufficient. The authors calculate that talking and breathing release ~460<em>N</em><sub>0</sub> and ~10<em>N</em><sub>0</sub> (quanta)/hour, respectively, providing a basis to estimate the risks of everyday activities. They also provide a calculation which motivates the observation that fomites appear to account for a small percentage of total COVID-19 infection events.
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<em>Read </em>Mara Prentiss, Arthur Chu, Karl K. Berggren, "Superspreading Events Without Superspreaders: Using High Attack Rate Events to Estimate <em>N</em><sub>0</sub> for Airborne Transmission of COVID-19," medRxiv 2020.10.21.20216895; <a href="https://doi.org/10.1101/2020.10.21.20216895" title="">doi.org/10.1101/2020.10.21.20216895</a>.
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Mon, 26 Oct 2020 04:00:00 +0000webmaster1536022 at https://www.physics.harvard.edu<span ng-non-bindable>Probing light-driven quantum materials with ultrafast resonant inelastic X-ray scattering</span>
https://www.physics.harvard.edu/news/probing-light-driven-quantum-materials-ultrafast-resonant-inelastic-x-ray-scattering
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Ultrafast optical pulses are an increasingly important tool for controlling quantum materials and triggering novel photo-induced phase transitions. Understanding these dynamic phenomena requires a probe sensitive to spin, charge, and orbital degrees of freedom. Time-resolved resonant inelastic X-ray scattering (trRIXS) is an emerging spectroscopic method, which responds to this need by providing unprecedented access to the finite-momentum fluctuation spectrum of photoexcited solids. In the latest issue of <i>Communication Physics, </i>Profs. Matteo Mitrano (Harvard) and Yao Wang (Clemson University) reviewed state-of-the-art trRIXS experiments on condensed matter systems, as well as recent theoretical advances, and describe future research opportunities in the context of light control of quantum matter.
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Mitrano, M., Wang, Y. Probing light-driven quantum materials with ultrafast resonant inelastic X-ray scattering. <i>Comm Phys </i><b>3, </b>184 (2020). <a href="https://doi.org/10.1038/s42005-020-00447-6" rel="nofollow">https://doi.org/10.1038/s42005-020-00447-6</a>
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Mon, 19 Oct 2020 04:00:00 +0000webmaster1535034 at https://www.physics.harvard.edu<span ng-non-bindable>Mundy Receives Packard Fellowship</span>
https://www.physics.harvard.edu/news/mundy-receives-packard-fellowship
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On October 15, the David and Lucile Packard Foundation announced the 2020 class of <a href="https://www.packard.org/insights/news/packard-fellowships-in-science-and-engineering-announces-2020-class-of-fellows/" title="">Packard Fellows for Science and Engineering</a>. This year Prof. Julia Mundy is one of 20 innovative early-career scientists and engineers, who will each receive $875,000 over five years to pursue their research.
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The Packard Fellowships in Science and Engineering are among the nation’s largest nongovernmental fellowships, designed to allow maximum flexibility in how the funding is used. Since 1988, this program has supported the blue-sky thinking of scientists and engineers whose research over time has led to new discoveries that improve people’s lives and enhance our understanding of the universe. Packard Fellows are at the cutting edge of research into crucial issues like <a href="https://news.harvard.edu/gazette/story/2020/05/pardis-sabetis-work-on-infectious-disease-coronavirus/">COVID-19</a> and <a href="https://source.wustl.edu/2019/10/climate-scientist-konecky-named-packard-fellow/">climate change</a>, and have gone on to receive the highest accolades, including Nobel Prizes in Chemistry and Physics, the Fields Medal, and many other prizes.
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Fri, 16 Oct 2020 04:00:00 +0000webmaster1534898 at https://www.physics.harvard.edu<span ng-non-bindable>Monday Colloquium: Ben Mazin (UC Santa Barbara) "Microwave Kinetic Inductance Detectors for Astrophysics, Biophysics, and Dark Matter Detection"</span>
https://www.physics.harvard.edu/event/monday-colloquium-ben-mazin-uc-santa-barbara
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Optical and near-IR Microwave Kinetic Inductance Detectors, or MKIDs, are superconducting detectors that can tell you the energy and arrival time of each individual photon without false counts. In this talk I will discuss the recent progress my group has made improving MKID and fielding them at some of the largest telescopes in the world. I will also discuss our efforts to broaden the scientific relevance of these detectors to other fields, including biological microscopy and dark matter detection.
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Mon, 19 Oct 2020 20:30:00 +0000clayman1534805 at https://www.physics.harvard.edu<span ng-non-bindable>Monday Colloquium: Eric Heller (Harvard University) "Blochbusting: The missing theory of resistivity in normal metals and superlattices "</span>
https://www.physics.harvard.edu/event/monday-colloquium-eric-heller-harvard-university-blochbusting-missing-theory
Mon, 05 Oct 2020 20:30:00 +0000clayman1534487 at https://www.physics.harvard.edu<span ng-non-bindable>Mathematical Picture Language Seminar: David Evans (Cardiff U.), "K-theory of Operator Algebras, Orbifolds, and Conformal Field Theory"</span>
https://www.physics.harvard.edu/event/mathematical-picture-language-seminar-david-evans-cardiff-u-k-theory-operator-algebras
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<span><b><span><span><span style="color:#313131">Speaker: David Evans</span></span></span></b></span><br /><span><b><span><span><span style="color:#313131">Affiliation</span></span></span></b><span><span><span style="color:#313131">: Cardiff University</span></span></span></span><br /><b>Title</b>: "<span><span><span><span><span style="color:black">K-theory of Operator Algebras, Orbifolds, and Conformal Field Theory</span></span></span></span></span>"<br /><strong>Zoom</strong><span><b><span><span><span style="color:#313131">: <a href="https://harvard.zoom.us/j/779283357?pwd=MitXVm1pYUlJVzZqT3lwV2pCT1ZUQT09">https://harvard.zoom.us/j/779283357?pwd=MitXVm1pYUlJVzZqT3lwV2pCT1ZUQT09</a></span></span></span></b></span>
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<span><b><span style="padding:0in"><span><span><span style="color:#333333">Abstract</span></span></span></span></b><span style="padding:0in"><span><span><span style="color:#333333">:<br />Subfactors and K-theory are useful mechanisms for understanding modular tensor categories and conformal field theories CFT. As part of this, one issue is to try and construct or reconstruct a conformal field theory as the representation theory of a conformal net of algebras, or as a vertex operator algebra from a given abstractly presented modular tensor category. Freed, Hopkins and Teleman realized the chiral Verlinde rings of WZW models as twisted equivariant K-theory. I will describe work which has led to represent the full CFT and modular invariant partition function K-theoretically and descriptions of Verlinde rings as Hilbert modules over an operator algebra, and higher equivariant twists with bundles beyond compact operators. Orbifold models play an important role and orbifolds of Tambara-Yamagami systems are relevant to understanding the double of the Haagerup as a conformal field theory. This is joint work with Andreas Aaserud, Terry Gannon and Ulrich Pennig.</span></span></span></span></span>
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Tue, 29 Sep 2020 14:00:00 +0000webmaster1531506 at https://www.physics.harvard.edu<span ng-non-bindable>Monday Colloquium: Martin White (UC, Berkley), "Modeling large-scale structure for the golden era of cosmological surveys"</span>
https://www.physics.harvard.edu/event/monday-colloquium-martin-white-uc-berkley-modeling-large-scale-structure-golden-era
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<b>Martin White (UC, Berkley) </b><br />"Modeling large-scale structure for the golden era of cosmological surveys"
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<strong>Abstract:</strong><br />The Universe we observe exhibits order on a wide range of scales, and the study of this large-scale structure provides one of our premier laboratories for fundamental physics, cosmology and astrophysics. I will present recent advances in analytic models of this large scale structure applicable to the numerous observational programs getting underway or under construction in this golden era of cosmological surveys.
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Mon, 21 Sep 2020 20:30:00 +0000webmaster1531217 at https://www.physics.harvard.edu<span ng-non-bindable>Mathematical Picture Language Seminar: Yunxiang Ren (Harvard), "Triangular Prism equations and categorification"</span>
https://www.physics.harvard.edu/event/mathematical-picture-language-seminar-yunxiang-ren-harvard-triangular-prism-equations
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<span><b><span><span><span style="color:#313131">Speaker: Yunxiang Ren</span></span></span></b></span><br /><span><b><span><span><span style="color:#313131">Affiliation</span></span></span></b><span><span><span style="color:#313131">: Harvard University</span></span></span></span><br /><span><b><span><span><span><span style="color:#201f1e">Title :</span></span></span></span></b> <span><span><span style="color:black">Triangular Prism equations and categorification</span></span></span></span><br /><strong>Zoom</strong><span><b><span><span><span style="color:#313131">: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__harvard.zoom.us_j_779283357&d=DwMFaQ&c=WO-RGvefibhHBZq3fL85hQ&r=nlqvXX6Jmbu52yOuosGBtKKs0OQ7eTClhH721mPk7Mc&m=d6iNmXqxlhdhBjLGoff4wAibUK2dXAZ5uKJm5BRtG34&s=6QP3QscxFJ-sjDcl2ovzrVlsRIVxOKW_wK_SOIqnwe0&e=" target="_blank">https://harvard.zoom.us/j/779283357</a></span></span></span></b></span>
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<span><b><span style="padding:0in"><span><span><span style="color:#333333">Abstract</span></span></span></span></b><span style="padding:0in"><span><span><span style="color:#333333">:<br />Fusion categories have been extensively studied by Mathematicians and have proved to have many important applications in quantum physics. A fusion category is completely determined by a set of F-symbols which satisfies the pentagon equations. In general, the fusion categories are constructed by different approaches and their F-symbols remain unknown. In this talk, we introduce the triangular prism equations for fusion categories and show that they are equivalent to the pentagon equations. Moreover, we provide a relevant way to manage the complexity by localization, and thus a possible approach to solve them for the F-symbols. As applications, we provided new criteria for categorification and a categorical approach to the neargroup construction, improving Izumi's equations.</span></span></span></span></span>
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Tue, 22 Sep 2020 14:00:00 +0000webmaster1530652 at https://www.physics.harvard.edu