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Events Archive 2023
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Lessons from the Black Hole Information Problem—Benjamin STRITTMATTER
Hawking's information puzzle offers a unique perspective on how the effects of quantum gravity are imprinted on the low energy limit of the theory. Crucially, unitarity of black hole evaporation demands that the entropy of Hawking radiation follows a Page curve. In this talk, I aim to give a ...
Bayes Centre 5.45
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Life in a tight spot: How bacteria spread through complex environments—Sujit DATTA
Abstract: Bacterial spreading through motility and growth plays a central role in agriculture, biotechnology, the environment, and medicine. These processes are typically studied in the lab in liquid cultures or on flat surfaces; however, many bacterial habitats—e.g., soils, sediments, and biological gels/tissues—are more complex and crowded ...
Higgs Centre Seminar Room, JCMB
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Seminar with Jeff Oishi—Jeff OISHI
To be announced
Higgs Centre Seminar Room, JCMB
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From LandauGinzburg to Matrix factorisations and TQFT—Benjamin HAAKE
LandauGinzburg models have been used in various areas of
mathematical physics. For example, there is a close link between them
and sigma models with CalabiYau targets, thus making them interesting
for String theory. Without going into details on these motivations, I
will present LandauGinzburg models as an interesting example of ...
Bayes Centre 5.45
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Higher categories, representation theory, and noninvertible symmetries from 6D N=(2,0) SCFTs—Veronica PASQUARELLA
With this talk, I wish to highlight the intertwining nature of higher category theory and gauge theory, with representation theory being the binding element in between them. 6D N=(2,0) SCFTs being the natural realm where this correspondence takes place, I will show that the categorical understanding of class ...
Bayes Centre 5.45
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SemiInfinite Cohomology and Potential Applications to NonLorentzian Physics—Girish VISHWA
Semiinfinite cohomology, first introduced by Boris Feigin in 1984, was shown to be an invaluable tool in the computation of string theory spectra, since it provides the mathematical setting for BRST cohomology. In this talk, I will provide an elementary introduction to the semiinfinite cohomology of graded Lie algebras, with ...
Higgs Centre Seminar Room, JCMB
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3d gravity as a source of integrable systems and hierarchies—Juan Carlos MORALES PARRA
In 1988 Witten showed the theory of (pure) General Relativity in 3 dimensions is exactly solvable, using an “equivalent” ChernSimons formulation. In this talk we will describe the theory using the Newman Penrose formalism and explicitly show how the equations of motion reduce to an AKNS system, proving in this ...
Bayes Centre 5.45
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Algebraic structures in higherspin gravity—Simon PEKAR
UNUSUAL LOCATION (due to clash with MSc presentations): JCMB 1501
Higherspin gravity refers to an extension of general relativity involving fields with spin higher than two. The problem of finding a consistent interacting theory of higherspin gravity can be reformulated into algebraic terms, whose solution is surprisingly simple and rigid ...
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Compositeness and QFT  or are chairs made of atoms?—Toby PETERKEN
In this talk, I explore the concept of compositeness in relation to QFT and argue that there is no satisfactory, exact definition of compositeness. Therefore, we are forced to conclude that all bound states, from pions to people, have the same fundamentality and that the sentence "chairs are made of ...
Higgs Centre Seminar Room, JCMB
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An Introduction to QCD Sum Rules—Matthew ROWE
QCD sum rules provide an elegant way of accessing non perturbative physics using the tools of perturbation theory. In this talk I will attempt a relatively selfcontained introduction to QCD sum rules using the classic example of pseudoscalar correlators to calculate meson decay constants. I will then discuss some practical ...
Bayes Centre 5.45
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A look at some "Axioms for the category of Hilbert spaces (and linear contractions)"—Nesta VAN DER SCHAAF
We'll have a look at a new result that characterises Hilbert
spaces (and linear contractions) in terms of categorical axioms that do
not refer to probabilities, complex numbers, inner products,
continuity, convexity, or dimension. To avoid going into too many
technical details, I will try to motivate the axioms ...
Higgs Centre Seminar Room, JCMB
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Chasing Motes: A Physicist's introduction to Hopf Algebras—Sam TEALE
Hopf Algebras are examples of bialgebras, being both an algebra and coalgebra and are additionally equipped with an endomorphism known as an antipode which is analogous to the map of groups that takes elements to their inverse. These structures have been studied since 1941 first in the field of algebraic ...
Bayes Centre 5.45
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The Bethe ansatz in practice: an application to a minimal model in nonequilibrium statistical physics—Ivan LOBASKIN
Integrable systems are, loosely speaking, models that can be solved exactly using certain standard methods. For quantum and stochastic 1D lattice models, this method is the Bethe ansatz. Despite this, in physics, integrability techniques have a reputation of being excessively formal and opaque. Indeed, even when a formal exact solution ...
Higgs Centre Seminar Room, JCMB
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Pedagogical Introduction to Higher Principal Bundles—Dominik RIST
From the Standard Model of particle physics to condensed matter systems, gauge theories form a powerful framework to understand Nature. Mathematically, gauge fields correspond to connections on principal bundles, which are described by Lie algebra valued 1forms. String theory considerations motivate the lift of this picture to a categorified setting ...
Bayes Centre 5.45
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A new theory of the universe—Neil TUROK
Observations of the universe on very small and large scales have revealed a surprising economy in its basic laws and structure. In this light, we have attempted to find new, more minimal solutions to cosmology’s central puzzles. Instead of postulating a prehot big bang period, such as inflation, we ...
Higgs Centre Seminar Room, JCMB
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Skyrmions in the gauged Sigma model of chiral magnets—Peter GERLAGH
We characterise skyrmions in Bogomolny models of chiral magnets without axisymetry. We show a duality between these Bogomolny models and the specific Bogomolny model wherein the socalled DMI tensor is rank one. The potential in these models have two separate minimums and corresponding stationary vacuums. Exact solutions with skyrmions are ...
Bayes Centre 5.45
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HiggsMaxwell Meeting: Higgs Physics
HiggsMaxwell workshops are a series of annual oneday meetings to discuss the current topics in theoretical and experimental particle physics and the prospects for future discoveries. The meeting is organised by the Universities of Durham, Edinburgh, Glasgow and Lancaster, and is held at the Royal Society of Edinburgh in Edinburgh ...
Royal Society of Edinburgh, 2226 George St, Edinburgh EH2 2PQ
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Fundamental physics from galaxy shapes—Alex HALL
The Lambda Cold Dark Matter model continues to provide a good fit to a wide range of cosmological data, and extensions to the model are almost all disfavoured observationally. This is troubling since neither CDM nor Lambda, together constituting 95% of the cosmic energy budget, are understood. These dark components ...
Higgs Centre Seminar Room, JCMB
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Active Solids—Anton SOUSLAV
Active solids consume energy to allow for actuation and shape change not possible in equilibrium. In this talk, I will focus on the elasticity of systems as wideranging as farfromequilibrium hydrogels, nanoparticles, and mechanical structures composed of active robotic components. First, I will introduce our recent work on hydrogel spheres ...
Higgs Centre Seminar Room, JCMB
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Two Ways to Learn about the Universe—James PEEBLESRoger PENROSE
In this public talk, geared towards a general audience, two recent Nobel Prize recipients, Peebles and Penrose, will offer autobiographical retrospectives on their journey towards solving some of the most profound questions in cosmology. Whereas Peebles adopted an empirical approach, learning about the universe by modelling the data, Penrose focused ...
50 George Square, Edinburgh
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