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 17 records

Europe/Rome 2020 Workshop on String Field Theory and Related Aspects Due to Covid-19, the workshop will be held online. Links to the videoconferences will be available on the webpage. There is no registration fee and all lectures will be broadcast live. https://www.ictp-saifr.org/workshop-on-fundamental-aspects-of-string-theory/ ICTP-SAIFR, Sao Paulo, Brazil ICTP pio@ictp.it

Seminar

8 Jun 2020 - 12 Jun 2020

@ ICTP-SAIFR, Sao Paulo, Brazil

Strings and Higher Dimensional Theories

Workshop On Fundamental Aspects of String Theory - Week 2

Organizer(s): Nathan Berkovits (ICTP-SAIFR/IFT-UNESP, Brazil) Ted Erler (ACSR, Prague, Czech Republic) Thiago Fleury (IIP-UFRN, Brazil) Carlo Maccaferri (Turin University and INFN, Italy) Yuji Okawa (Tokyo University Komaba, Japan) Martin Schnabl (Charles University – Prague, Czech Republic) Ashoke Sen (Harish-Chandra Research Institute, India) Brenno Vallilo (Univ. Andres Bello, Chile) Barton Zwiebach (MIT, USA)

Seminar Start Time: 14:00

Europe/Rome To register to the Seminar Series please do it here. In this talk I will review the state of the art and the new perspectives in the theoretical and experimental study of analog models of quantum field theories in flat, curved, or time-dependent backgrounds using condensed matter and optical systems. After a brief presentation of the theory and experiments on Hawking emission of phonons from acoustic horizons in quantum fluids of ultracold atoms and of light, I will present recent results (in collaboration with Luca Giacomelli) on superradiance effects in different geometries. In rotating configurations, the instability of multiply charged vortices can be understood in terms of an ergoregion instability at the vortex core. Introduction of synthetic gauge fields in planar geometries extends the range of space-time metrics that can be generated and allows for analytical insight into superradiant scattering processes. The relation between superradiant scattering and superradiant instabilities will be clarified. As a further extension of the analog model paradigm, I will present how impurity atoms in an atomic fluid can form two-level emitters coupled to the quantum field. Based on recent works with Jamir Marino, Gabriel Menezes and Alessio Recati, I will present observable predictions of Ginzburg radiation and superradiant lasing for moving emitters along linear or circular trajectories. I will finally outline the on-going investigations (in collaboration with Salvatore G. Butera) in the direction of observing back-reaction effects of the quantum Hawking emission onto the black hole background. Virtual ICTP pio@ictp.it

Seminar

9 Jun 2020

@ Virtual

Condensed Matter and Statistical Physics

CMSP Seminar (Joint ICTP/SISSA Statistical Physics): Quantum fields in curved space-times with atomic and optical systems: New Directions from synthetic gauge fields and quantum emitters

Speaker(s): Iacopo Carusotto (INO-CNR BEC Center and Università di Trento)

Seminar Start Time: 11:00

Europe/Rome Please register in advance for this meeting: https://zoom.us/meeting/register/tJEqcu6hqz4tGdeprrg097d5Ys9-aOSRF1Ue After registration, you will receive a confirmation email containing information about joining the meeting. Zoom Meeting ICTP pio@ictp.it

Seminar

9 Jun 2020

@ Zoom Meeting

Cosmology

Photon number conserving semi-numerical models of reionization

Speaker(s): Tirthankar Roy Choudhury (TIFR, India)

Seminar Start Time: 14:30

Europe/Rome Join Zoom Meeting https://zoom.us/j/475819702 Meeting ID: 475-819-702 To obtain the PASSWORD for this zoom meeting, please contact qls@ictp.it The traditional approach of statistical physics to supervised learning routinely assumes unrealistic generative models for the data: usually inputs are independent random variables, uncorrelated with their labels. Only recently, statistical physicists started to explore more complex forms of data, such as equally-labelled points lying on (possibly low dimensional) object manifolds. Here we provide a bridge between this recently-established research area and the framework of statistical learning theory, a branch of mathematics devoted to inference in machine learning. The overarching motivation is the inadequacy of the classic rigorous results in explaining the remarkable generalization properties of deep learning. We propose a way to integrate physical models of data into statistical learning theory, and address, with both combinatorial and statistical mechanics methods, the computation of the Vapnik-Chervonenkis entropy, which counts the number of different binary classifications compatible with the loss class. As a proof of concept, we focus on kernel machines and on two simple realizations of data structure introduced in recent physics literature: k-dimensional simplexes with prescribed geometric relations and spherical manifolds (equivalent to margin classification). Entropy, contrary to what happens for unstructured data, is nonmonotonic in the sample size, in contrast with the rigorous bounds. Moreover, data structure induces a novel transition beyond the storage capacity, which we advocate as a proxy of the nonmonotonicity, and ultimately a cue of low generalization error. The identification of a synaptic volume vanishing at the transition allows a quantification of the impact of data structure within replica theory, applicable in cases where combinatorial methods are not available, as we demonstrate for margin learning. Zoom Meeting ICTP pio@ictp.it

Seminar

9 Jun 2020

@ Zoom Meeting

Quantitative Life Sciences

Statistical Learning Theory of geometrically structured data

Speaker(s): Pietro Rotondo - Department of Physics, University of Milan

Support E-Mail: qls@ictp.it

Seminar Start Time: 15:00

Europe/Rome Registration Instructions: - If you have already registered for a previous CMSP seminar there is no need to register again. Please remember to use the link within the email you received after the registration to join the webinar. - If you have NOT registered before, please make sure to register several days in advance before the webinar to the Seminar Series by clicking here. ___________________________________________________________________ Abstract: Over the last two decades, researchers have invested enormous research effort into hybrid/organic photovoltaics, leading to the recent launch of the first commercial products that use this technology. Dye-sensitized solar cells (DSCs) have shown clear advantages over competing technologies. The top certified efficiency of DSCs exceeds 11% and the lab-cell efficiency is greater than 13%. In 2012, the first reports of high efficiency solid-state solar cells based on organohalide lead perovskites completely revolutionized the field. These materials are used as light-absorbers in DSCs and as light-harvesting and electron conductor in meso-superstructured and flat heterojunction perovskite solar cells (PSCs) and show certified efficiencies that currently exceed 25%. To effectively compete with conventional photovoltaics, emerging technologies need to achieve higher efficiency and stability, while maintaining low production costs. Many of the advances in the DSCs and PSCs field have relied on the computational design and screening of new materials. Suitable modeling strategies further allow researchers to observe the otherwise inaccessible but crucial hetero-interfaces that control the solar cell operation, allowing researchers the opportunity to develop new and more efficient materials and optimize processes. We illustrate the basic device architectures and operating principles of both DSCs and PSCs highlighting the fundamental modeling strategies and revealing fundamental aspects of the device’s operational mechanism. Although the modeling of DSCs is relatively mature, the recent “perovskite storm” has presented new problems and new modeling challenges, such as understanding exciton formation/dissociation at interfaces and carrier recombination in these materials. References: 1. De Angelis, F. Acc. Chem. Res. 2014, 47, 3349. 2. De Angelis, F.; Di Valentin, C.; Fantacci, S.; Vittadini, A.; Selloni, A. Chem. Rev. 2014, 114, 9708. 3. Azpiroz, J. M.; Mosconi, E.; Bisquert, J.; De Angelis, F. Energy Environ. Sci. 2015, 8, 2118. 4. Mosconi, E.; Meggiolaro, D.; Snaith, H.; Stranks, S. D.; De Angelis, F. Energy Environ. Sci. 2016, 9, 3180. 5. Quarti, C.; Mosconi, E.; Ball, J. M.; D'Innocenzo, V.; Tao, C.; Pathak, S.; Snaith, H.; Petrozza, A.; De Angelis, F. Energy Environ. Sci. 2016, 9, 155. 6. Chen, B.; Li, T.; Dong, Q.; Mosconi, E.; Song, J.; Chen, Z.; Deng, Y.; Liu, Y.; Ducharme, S.; Gruverman, A.; De Angelis, F.; Huang, J. Nat. Mater., 2018, 17, 1020-1026. 7. De Angelis, F.; Petrozza, A. Nat. Mater., 2018, 17, 377–384. 8. Yang S.; Chen S.; Mosconi E.; Fang Y.; Xiao X.; Wang C.; Zhou Y.; Yu Z.; Zhao J.; Gao Y.; De Angelis F.; Huang J. Science, 2019, 365, 473–478. 9. Motti S. G.; Meggiolaro D.; Barker A. J.; Mosconi E.; Perini C. A. R.; Ball J. M.; Gandini M.; Kim M.; De Angelis F.; Petrozza A. Nat. Photonics, 2019, 15, 532–539. 10. De Angelis F. ACS Energy Lett., 2020, 5, 935-937. Virtual Atomistic Webinar ICTP pio@ictp.it

Seminar

10 Jun 2020

@ Virtual Atomistic Webinar

Condensed Matter and Statistical Physics

CMSP Seminar (Atomistic Simulation Webinar Series): Modeling Materials and Processes in Hybrid/Organic Photovoltaics: From Dye-sensitized to Perovskite Solar Cells

Speaker(s): Filippo De Angelis (Dept. of Chemistry, Univ. of Perugia and Computational Lab. for Hybrid/Organic Photovoltaics CLHYO, CNR-SCITEC, Perugia, Italy)

Seminar Start Time: 11:00

Europe/Rome Paolo Carloni is Professor in computational biophysics at the Department of Physics of RWTH-University of Aachen, Aachen, Germany, and Director of the Institute for Computational Biomedicine at the Juelich Research Center, Juelich, Germany, after spending a dozen years as Professor in SISSA, Trieste, Italy (1998-2009). He also holds a position as Co-director of the Key Laboratory for multi-scale modeling at the VNU University of Science in Hanoi, Vietnam. Carloni's research focuses on molecular simulation and bioinformatics approaches to molecular biophysics, molecular medicine and structural genomics. Abstract: The human brain is the most complex organ known in nature. It features more than 80 billion neurons each making thousands of synaptic connections with other neurons. The communication between neurons at synapses is chemical. It involves proteins, small molecules, and other biomolecules such as RNA. Hence, a molecular-level description of chemotransmission is really important to ultimately understand brain function and dysfunction. Here, we will present recent multi scale molecular simulation studies (from quantum to coarse grain) of key molecular processes occurring during chemotransmission. This knowledge is used to identify new ligands interfering with neurological diseases. In the final (and short) part of my talk I will completely switch gears. Given the recent Covid-19 pandemic, our group, as many other simulation groups worldwide, has recently re-directed part of the research to help combat the virus, helping the scientific community by data sharing (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7194014/). Here, I will briefly describe our current effort, within an EU project involving 18 research units, to identify possibly molecules which may bind and inhibit Covid-19 proteins. The talk (approx. 40 minutes) will be in a webinar format, with an introduction by the Director. A question/answer session will follow. PLEASE REGISTER AHEAD FOR THIS WEBINAR AT THE FOLLOWING LINK: https://zoom.us/webinar/register/WN_lJj2IyUsTbCf298uZ__ytw After registering, you will receive a confirmation email containing information about joining the webinar. The talk will also be livestreamed from the ICTP website. Zoom meeting ICTP pio@ictp.it

Colloquium

10 Jun 2020

@ Zoom meeting

ICTP Colloquium by Prof. Paolo Carloni on "Computational molecular medicine: from neurobiology to Covid-19"

Speaker(s): Prof. Paolo Carloni, University of Aachen, and Forschungszentrum Juelich GmbH, Germany

Colloquium Start Time: 15:00

Europe/Rome Please register in advance for this meeting: https://zoom.us/meeting/register/tJwrcu6hrjwvGd3rxgA4UpjhJI5Cpd8v-XZs After registration, you will receive a confirmation email containing information about joining the meeting Abstract: We will discuss singular constant scalar curvature Kaehler (cscK) metrics, which may have cone singularities and/or degenerate somewhere. They appear naturally in several geometric problems. In this talk, we will reminisce a little about the past development around singular metrics, and then proceed to recent progress on existence of singular cscK metrics. Zoom Meeting ICTP pio@ictp.it

Seminar

11 Jun 2020

@ Zoom Meeting

Math Associates Seminar: Singular cscK metrics

Speaker: Kai Zheng (School of Mathematical Sciences, Tongji University, Shanghai)

Seminar Start Time: 14:00

Seminar

16 Jun 2020

@ Virtual

Condensed Matter and Statistical Physics

CMSP Seminar (Joint ICTP/SISSA Statistical Physics): title to be announced

Speaker(s): Jan de Boer (Amsterdam University)

Seminar Start Time: 11:00

Europe/Rome Please register in advance for this meeting: https://zoom.us/meeting/register/tJcpcuCpqDsuH9fJOnjD7ywG5yGcgHD-H1Zh After registration, you will receive a confirmation email containing information about joining the meeting. Zoom Meeting ICTP pio@ictp.it

Seminar

16 Jun 2020

@ Zoom Meeting

Phenomenology of Particle Physics

Exploring mass-degeneracies in extended Higgs sectors

Speaker(s): Shoaib Munir (EAIFR)

Seminar Start Time: 14:30

Europe/Rome Please register in advance for this meeting: https://zoom.us/meeting/register/tJUtcOmspz8oHtyelXXkLhGM3RqbUhwKndhs After registration, you will receive a confirmation email containing information about joining the meeting. Zoom Meeting ICTP pio@ictp.it

Seminar

23 Jun 2020

@ Zoom Meeting

Cosmology

Title to be announced

Speaker(s): Marcello Musso (EAIFR)

Seminar Start Time: 14:30

Europe/Rome Information on how to register will follow soon. Abstract: The seminar will start with the definition of what is mean curvature flow of a closed hypersurface, illustrated with some basic examples. Next, I will recall the variational nature of the flow and some of the main well-known results, such as Grayson theorem for the evolution of plane curves, and Huisken convexity preserving theorem. At the end of the seminar, some more advanced topics will be mentioned. Zoom Meeting ICTP pio@ictp.it

Seminar

23 Jun 2020

@ Zoom Meeting

Mathematics

Basic notions seminar on mean curvature flow of closed hypersurfaces

Speaker(s): Bellettini Giovanni (ICTP/University of Siena)

Seminar Start Time: 16:00

Europe/Rome Abstract: We discuss the thermodynamic and ergodic properties of a smooth realization of pseudo-Anosov surface homeomorphisms. In this realization, pseudo-Anosov map is uniformly hyperbolic outside of a neighborhood of a set of singularities, and the trajectories are slowed down so the differential is the identity at the singularities. Using Young towers, we prove existence and uniqueness of equilibrium measures for geometric $t$-potentials. This family of equilibrium measures includes a unique smooth SRB measure and a measure of maximal entropy, the latter of which has exponential decay of correlations and the Central Limit Theorem. Zoom Meeting ICTP pio@ictp.it

Seminar

24 Jun 2020

@ Zoom Meeting

Mathematics

Ergodic and thermodynamic properties of pseudo-Anosov diffeomorphisms

Speaker(s): Dominic Veconi (Penn State University)

Seminar Start Time: 17:00

Seminar

30 Jun 2020

@ VIRTUAL

Condensed Matter and Statistical Physics

CMSP Seminar (Joint ICTP/SISSA Statistical Physics): title to be announced

Speaker(s): Ananda Roy (Physik-Department, Technische Universität München)

Seminar Start Time: 11:00

Europe/Rome Register in advance for this meeting: https://zoom.us/meeting/register/tJcrfu6orzIqHNLeqwgYa2VSb7VITel-fKLU After registering, you will receive a confirmation email containing information about joining the meeting. Zoom Meeting ICTP pio@ictp.it

Seminar

30 Jun 2020

@ Zoom Meeting

Strings and Higher Dimensional Theories

String theory on AdS3 in the tensionless limit

Speaker(s): Gaston Giribet (University of Buenos Aires, Argentina)

Seminar Start Time: 14:30

Europe/Rome Abstract: We obtain Margulis-type asymptotic estimates for the number of free homotopy classes of closed geodesics on certain manifolds without conjugate points. Our results cover all compact surfaces of genus at least 2 without conjugate points. This is based on a join work with Vaughn Climenhaga and Gerhard Knieper. Zoom Meeting ICTP pio@ictp.it

Seminar

2 Jul 2020

@ Zoom Meeting

Mathematics

Math Associates Seminar: Closed Geodesics on Surfaces without Conjugate Points

Speaker(s): Khadim WAR (IMPA/University of Chicago)

Seminar Start Time: 14:00

Europe/Rome Please register in advance for this meeting: https://zoom.us/meeting/register/tJcqf-irqzouGtR1bB341hOP5kNGy22z8LLr After registration, you will receive a confirmation email containing information about joining the meeting. Zoom Meeting ICTP pio@ictp.it

Seminar

7 Jul 2020

@ Zoom Meeting

Cosmology

Title to be announced

Speaker(s): Shant Baghram (Sharif University, Iran)

Seminar Start Time: 14:30

Europe/Rome Please register in advance for this meeting: https://zoom.us/meeting/register/tJcsf-CgqjIoH9bdXAizv-ocxRjIxYjmguDT After registration, you will receive a confirmation email containing information about joining the meeting. Zoom Meeting ICTP pio@ictp.it

Seminar

14 Jul 2020

@ Zoom Meeting

Phenomenology of Particle Physics

Title to be announced

Speaker(s): Vikram Rentala (IITB)

Seminar Start Time: 14:30

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Virtual Seminars

Seminar

Strings and Higher Dimensional Theories

Workshop On Fundamental Aspects of String Theory - Week 2

Seminar

Condensed Matter and Statistical Physics

CMSP Seminar (Joint ICTP/SISSA Statistical Physics): Quantum fields in curved space-times with atomic and optical systems: New Directions from synthetic gauge fields and quantum emitters

Seminar

Cosmology

Photon number conserving semi-numerical models of reionization

Seminar

Quantitative Life Sciences

Statistical Learning Theory of geometrically structured data

Seminar

Condensed Matter and Statistical Physics

CMSP Seminar (Atomistic Simulation Webinar Series): Modeling Materials and Processes in Hybrid/Organic Photovoltaics: From Dye-sensitized to Perovskite Solar Cells

Colloquium

ICTP Colloquium by Prof. Paolo Carloni on "Computational molecular medicine: from neurobiology to Covid-19"

Seminar

Math Associates Seminar: Singular cscK metrics

Seminar

Condensed Matter and Statistical Physics

CMSP Seminar (Joint ICTP/SISSA Statistical Physics): title to be announced

Seminar

Phenomenology of Particle Physics

Exploring mass-degeneracies in extended Higgs sectors

Seminar

Cosmology

Title to be announced

Seminar

Mathematics

Basic notions seminar on mean curvature flow of closed hypersurfaces

Seminar

Mathematics

Ergodic and thermodynamic properties of pseudo-Anosov diffeomorphisms

Seminar

Condensed Matter and Statistical Physics

CMSP Seminar (Joint ICTP/SISSA Statistical Physics): title to be announced

Seminar

Strings and Higher Dimensional Theories

String theory on AdS3 in the tensionless limit

Seminar

Mathematics

Math Associates Seminar: Closed Geodesics on Surfaces without Conjugate Points

Seminar

Cosmology

Title to be announced

Seminar

Phenomenology of Particle Physics

Title to be announced

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