ICTP - Virtual Seminars

Virtual Seminars

ICTP is expanding its free, online, interactive streaming options for its seminars and colloquia to mitigate some of the effects of isolation during the COVID-19 emergency and beyond. Check this page frequently for upcoming events that will be shared via the interactive webinar platform Zoom.

Showing 15 records

Europe/Rome Hybrid seminar Venue: For in-person attendees IGAP/IFPU Lecture Room (New SISSA Building, room 205) For virtual attendees: Zoom Please use the links below (one per lecture) to register. After registering, you will receive a confirmation email containing information about joining the meeting. __________________ This short series of four lectures by T. Hausel (IST, Austria) and A. Mellit (Univ. of Vienna) will discuss the recent proof of the P=W conjecture in the theory of the moduli space of Higgs bundles on a curve. The following seminars will be given on Monday 5 December and Tuesday 6 December in the IGAP/IFPU Seminar Room (room number 205, new SISSA Building), but interested people can also attend via zoom (see links below - one link per lecture!): Monday 5 December 10:00 - 11:00 Introduction to P=W and Mirror symmetry - T. Hausel Zoom link: https://zoom.us/meeting/register/tJcvf-2vrz4iE9OO1g31YvHGCmmQ1qiQ5rc9 14:00 - 15:00 P=W via H_2 (part 1) - A. Mellit Zoom link: https://zoom.us/meeting/register/tJEvduGgrDMoE93-EF_JnCVZcSzSBxN3n3Sf Tuesday 6 december 10:00 - 11:00 P=W via H_2 (part 2) - A. Mellit Zoom link: https://zoom.us/meeting/register/tJArdOmorjwsEtyoc6-RDWyrCOEs3wIGQdR1 14:00 - 15:00 Mirror Symmetry and big algebras - T. Hausel Zoom link: https://zoom.us/meeting/register/tJYudu2srz4pGdJCyVTEA3xkWRxNztbph14r You are all welcome to join. ____________________ Abstracts Tamas Hausel Introduction to P=W and mirror symmetry Motivated by topological mirror symmetry for Langlands dual Higgs bundle moduli spaces, one can study the arithmetic of the corresponding character varieties to gain information on the weight filtration on their cohomology. In turn this lead to the P=W conjecture which identifies the weight filtration on the cohomology of the character variety with the perverse filtration of the Hitchin system on the cohomology of the Higgs moduli space. Mirror symmetry and big algebras First we discuss the mirror symmetry identification of the coordinate ring of certain very stable upward flows in the Hitchin system and the Kirillov algebra for the minuscule representation of the Langlands dual group via the equivariant cohomology of the cominuscule flag variety (e.g. complex Grassmannian). In turn we explain a conjectural extension of this picture to non-very stable upward flows in terms of a big commutative subalgebra of the Kirillov algebra, which also ringifies the equivariant intersection cohomology of the corresponding affine Schubert variety. Anton Mellit P=W via H_2 By H_2 we denote the Lie algebra of polynomial hamiltonian vector fields on the plane. We consider the moduli space of stable twisted Higgs bundles on an algebraic curve of given coprime rank and degree. De Cataldo, Hausel and Migliorini proved in the case of rank 2 and conjectured in arbitrary rank that two natural filtrations on the cohomology of the moduli space coincide. One is the weight filtration W coming from the Betti realization, and the other one is the perverse filtration P induced by the Hitchin map. Motivated by computations of the Khovanov-Rozansky homology of links by Gorsky, Hogancamp and myself, we look for an action of H_2 on the cohomology of the moduli space. We find it in the algebra generated by two kinds of natural operations: on the one hand we have the operations of cup product by tautological classes, and on the other hand we have the Hecke operators acting via certain correspondences. We then show that both P and W coincide with the filtration canonically associated to the sl_2 subalgebra of H_2. Hybrid ICTP pio@ictp.it

Seminar

5 Dec 2022 - 6 Dec 2022

@ Hybrid

Mathematics

IGAP Event - A Proof of the P=W Conjecture

Room: IGAP/IFPU Seminar Room (Room 205, new SISSA Building)

Seminar Start Time: 10:00

Europe/Rome This is a recurring meeting, therefore please register just once for all 4 sessions: https://zoom.us/meeting/register/tJUodOihqDMvE9fOe6s-MziaNCKeZeoaVSDt Venue (for in-person attendees): Luigi Stasi Seminar Room Timetable: Monday 5 December: 14:00 - 16:00 Tuesday 6 December: 14:00 - 16:00 Wednesday 7 December: 14:00 - 16:00 Thursday 8 December: 14:00 - 16:00 Abstract: An introductory lecture on operator and optimization theory will be given. To be specific, various notions of derivatives for mappings between Normed spaces will be discussed, with a special emphasis on mappings taking values in <span lang="EN-GB" style="font-size:12.0pt;font-family:Times;mso-fareast-font-family: Times;mso-bidi-font-family:Times;mso-ansi-language:EN-GB;mso-fareast-language: IT;mso-bidi-language:AR-SA">R connecting derivatives with optimization problems. We discuss the continuity, lower semicontinuity, differentiability, and, most importantly, optimization properties of convex functions in normed spaces. We will also go over the Fenchel conjugate and biconjugate for convex functions, as well as their properties. With these tools at our disposal, we move on to the duality methods in optimization, which allows us to solve unconstrained and constrained minimization problems (called the primal) by relating them to their dual problems obtained via the Fenchel conjugate. Finally, after discussing the Moreau proximity operator in Hilbert spaces, we will look at a popular class of optimization algorithms. References: [1] Kravvaritis, D. C., & Yannacopoulos, A. N. (2020). Variational methods in nonlinear analysis: with applications in optimization and partial differential equations. Walter De Gruyter Gmbh & Co Kg. [2] Bauschke, H. H., & Combettes, P. L. (2011). Convex analysis and monotone operator theory in Hilbert spaces (Vol. 408). New York: Springer. Hybrid ICTP pio@ictp.it

Seminar

5 Dec 2022 - 8 Dec 2022

@ Hybrid

Mathematics

CIMPA/ICTP Course on "Introduction to Optimization and Operator Theory"

Room: Leonardo Building - Luigi Stasi Seminar Room

Speaker: GEBRIE Anteneh Getachew (Debre Berhan University)

Please note: the CIMPA/ICTP Courses will be recorded and broadcasted. These will be hybrid courses. All are very welcome to join either online or in person. Venue: Stasi Seminar Room (ICTP Leonardo Da Vinci Building), for those wishing to attend in person.

Seminar Start Time: 14:00

Europe/Rome Zoom meeting link: https://zoom.us/j/98923348875 Meeting ID: 989 2334 8875 Password: 012412 Zoom Meeting + in presence ICTP pio@ictp.it

Seminar

7 Dec 2022

@ Zoom Meeting + in presence

Strings and Higher Dimensional Theories

Joint ICTP/SISSA Seminars: Towards an explicit theory of quantum gravity

Room: Leonardo Building - Euler Lecture Hall

Speaker(s): Ofer Aharony (Weizmann Institute)

Seminar Start Time: 14:30

Europe/Rome Zoom meeting link: https://zoom.us/j/98923348875 Meeting ID: 989 2334 8875 Password: 012412 Zoom Meeting + in presence ICTP pio@ictp.it

Seminar

7 Dec 2022

@ Zoom Meeting + in presence

Strings and Higher Dimensional Theories

Joint ICTP/SISSA Seminars: Deriving the Simplest Gauge String Duality

Room: Leonardo Building - Euler Lecture Hall

Speaker(s): Rajesh Gopakumar (ICTS, Bangalore)

Seminar Start Time: 16:00

Europe/Rome Venue: for in-person attendees (Leonardo da Vinci, Luigi Stasi Seminar Room). For virtual attendees: https://zoom.us/meeting/register/tJ0od-ihrTIjH9F3K0rVN45vAwYwC2diqLtL After registering, you will receive a confirmation email containing information about joining the meeting. Abstract: There is a beautiful connection between the prime numbers and the zeros of Riemann zeta-function in the complex plane, and understanding the distribution of these zeros can lead to remarkable consequences in our understanding of the primes. A famous open problem, known as the Riemann Hypothesis, states that the non-real zeros of the Riemann zeta-function lie on a vertical line. I will motivate this conjecture, describe some evidence for it, and describe some of the consequences it would lead to in our understanding of the primes. In particular, I will describe how to bound on the maximum gap between prime numbers assuming the Riemann Hypothesis (which is based on joint work with Carneiro and Soundararajan). hybrid ICTP pio@ictp.it

Seminar

9 Dec 2022

@ hybrid

Mathematics

Basic Notions Seminar - What is a moduli space?

Room: Leonardo Building - Luigi Stasi Seminar Room

Speaker: Diletta Martinelli (University of Amsterdam)

Seminar Start Time: 16:00

Europe/Rome Register in advance for this meeting: https://zoom.us/meeting/register/tJ0od-ihrTIjH9F3K0rVN45vAwYwC2diqLtL After registering, you will receive a confirmation email containing information about joining the meeting. Abstract: Given a certain set of mathematical objects, a guiding question is often the classification problem. In algebraic geometry, the objects that you would like to classify have usually some geometry interests, like for instance manifolds, vector bundles, algebraic curves. The attempt to reach a meaningful classification often leads to the construction of a moduli space: a parameter space whose points correspond to all the objects you would like to study. In the talk, I will give a very gentle introduction to the notion of parameter space focusing on elementary examples. If time permits, at the end I will give some hints towards more complicated but also more interesting examples. hybrid seminar ICTP pio@ictp.it

Seminar

9 Dec 2022

@ hybrid seminar

Mathematics

BASIC NOTIONS SEMINAR: What is a moduli space?

Room: Leonardo Building - Luigi Stasi Seminar Room

Speaker(s): Diletta Martinelli (University of Amsterdam)

Seminar Start Time: 16:00

Europe/Rome Join Zoom Meeting: https://zoom.us/j/93801312134 Meeting ID: 938 0131 2134 Passcode: 011101 Zoom Meeting + in presence ICTP pio@ictp.it

Seminar

13 Dec 2022

@ Zoom Meeting + in presence

Cosmology

HECAP Seminar: Title to be announced

Room: Leonardo Building - Euler Lecture Hall

Speaker(s): Vicharit Yingcharoenrat (KAVLI IPMU, Tokyo)

Seminar Start Time: 16:00

Europe/Rome Prof. Peter Zoller is a Professor for theoretical physics at the University of Innsbruck, and Scientific Director at IQOQI Innsbruck. His research interests include atomic physics and theoretical quantum optics, and many-body quantum physics with quantum gases, and quantum information, in close collaboration with experiment. Since 1981 he has trained 34 PhD students and hosted 57 Postdocs. Future ESQ Postdocs can develop their research profile benefiting from atomic physics and quantum optics, in particular quantum many-body physics at the interface to condensed matter physics and high energy physics, and quantum information. More information is available at: https://www.oeaw.ac.at/esq/home/esq-faculty/peter-zoller. ABSTRACT: Progress in developing analog quantum simulation platforms is reflected in increasing control of engineered many-body Hamiltonians, and the ability to perform single-site and single-shot readouts. This defines a new generation of programmable quantum simulators which combine a certain amount of programmability with scalability to large particle numbers. The focus of this talk is to report work from a theory-experiment collaboration with trapped ion platforms with up to fifty qubits/spins, with the goal to develop and demonstrate quantum protocols, addressing questions from the fundamental to the practical. Examples to be discussed include measurement protocols revealing the entanglement structure of the many-body wavefunction, and implementing `optimal' quantum metrology with variational quantum circuits, where quantum simulators act as `programmable quantum sensors'. The Colloquium will take part in the Budinich Lecture Hall on the ICTP Campus, and is an in-person event. All are welcome to attend. Light refreshments will be served in the Lobby after the talk. ICTP ICTP pio@ictp.it

Colloquium

14 Dec 2022

@ ICTP

ICTP Colloquium on "Programming Quantum Simulators with Atoms and Ions" by Prof. Peter Zoller, University of Innsbruck, and IQOQI Innsbruck

Address: Strada Costiera 11 34151 Trieste Italy

Room: Leonardo Building - Budinich Lecture Hall

Speaker(s): Prof. Peter Zoller, University of Innsbruck, and IQOQI, Austrian Academy of Sciences, Innsbruck, Austria

Colloquium Start Time: 16:00

Europe/Rome Join Zoom Meeting: https://zoom.us/j/99689084190 Meeting ID: 996 8908 4190 Passcode: 010001 Zoom Meeting + in presence ICTP pio@ictp.it

Seminar

20 Dec 2022

@ Zoom Meeting + in presence

Cosmology

HECAP Seminar: Title to be announced

Room: Leonardo Building - Euler Lecture Hall

Speaker(s): Giovanni Tambalo (Max-Planck-Institute for Gravitational Physics, Potsdam)

Seminar Start Time: 16:00

Europe/Rome Zoom meeting link: https://zoom.us/j/93941065417 Meeting ID: 939 4106 5417 Password: 012323 Zoom Meeting + in presence ICTP pio@ictp.it

Seminar

17 Jan 2023

@ Zoom Meeting + in presence

Phenomenology of Particle Physics

HECAP Seminar: Title to be announced

Speaker(s): Carlos Esteban Yaguna Toro (Univ. Pedagogica y Tecnologica, Colombia)

Seminar Start Time: 16:00

Seminar

19 Jan 2023

@ Zoom Meeting + in presence

Strings and Higher Dimensional Theories

HECAP Seminar: Title to be announced

Speaker(s): Raffaele Savelli (Università di Roma Tor Vergata)

Seminar Start Time: 16:00

Europe/Rome Zoom meeting link: <a class="moz-txt-link-freetext" href="https://zoom.us/j/96910824370" style="box-sizing: border-box; background-color: transparent; color: rgb(9, 86, 181); text-decoration: none; font-family: "Almaden Sans", Helvetica, Arial; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: 0.41999998688697815px; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-wrap: break-word;" target="_blank">https://zoom.us/j/96910824370 Meeting ID: 969 1082 4370 Password: 013232 Zoom Meeting + in presence ICTP pio@ictp.it

Seminar

24 Jan 2023

@ Zoom Meeting + in presence

Phenomenology of Particle Physics

HECAP Seminar: Title to be announced

Speaker(s): Nick Rodd (CERN)

Seminar Start Time: 16:00

Seminar

31 Jan 2023

@ Zoom Meeting + in presence

Phenomenology of Particle Physics

HECAP Seminar: Title to be announced

Speaker(s): Yann Goutternoire (Tel Aviv University)

Seminar Start Time: 16:00

Seminar

2 Feb 2023

@ Zoom Meeting

Strings and Higher Dimensional Theories

HECAP Seminar: Title to be announced

Speaker(s): Charles Marteau (University of British Columbia, Vancouver)

Seminar Start Time: 16:00

Seminar

7 Feb 2023

@ Zoom Meeting + in presence

Strings and Higher Dimensional Theories

HECAP Seminar: Title to be announced

Speaker(s): Roberto Emparan (University of Barcelona)

Seminar Start Time: 16:00

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Virtual Seminars

Seminar

Mathematics

IGAP Event - A Proof of the P=W Conjecture

Seminar

Mathematics

CIMPA/ICTP Course on "Introduction to Optimization and Operator Theory"

Seminar

Strings and Higher Dimensional Theories

Joint ICTP/SISSA Seminars: Towards an explicit theory of quantum gravity

Seminar

Strings and Higher Dimensional Theories

Joint ICTP/SISSA Seminars: Deriving the Simplest Gauge String Duality

Seminar

Mathematics

Basic Notions Seminar - What is a moduli space?

Seminar

Mathematics

BASIC NOTIONS SEMINAR: What is a moduli space?

Seminar

Cosmology

HECAP Seminar: Title to be announced

Colloquium

ICTP Colloquium on "Programming Quantum Simulators with Atoms and Ions" by Prof. Peter Zoller, University of Innsbruck, and IQOQI Innsbruck

Seminar

Cosmology

HECAP Seminar: Title to be announced

Seminar

Phenomenology of Particle Physics

HECAP Seminar: Title to be announced

Seminar

Strings and Higher Dimensional Theories

HECAP Seminar: Title to be announced

Seminar

Phenomenology of Particle Physics

HECAP Seminar: Title to be announced

Seminar

Phenomenology of Particle Physics

HECAP Seminar: Title to be announced

Seminar

Strings and Higher Dimensional Theories

HECAP Seminar: Title to be announced

Seminar

Strings and Higher Dimensional Theories

HECAP Seminar: Title to be announced

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