Unique extremality
Božin, V Lakic, N Marković, V Mateljević, M Journal d'Analyse Mathématique volume 75 issue 1 299-338 (Dec 1998)
Counting essential surfaces in a closed hyperbolic three-manifold
Kahn, J Marković, V Geometry & Topology volume 16 issue 1 601-624 (08 Apr 2012)
Mon, 15 Jun 2020
12:45
Virtual

SQCD and pairs of pants --- ZOOM SEMINAR

Shlomo Razamat
(Technion)
Abstract

We will show that minimally supersymmetric SU(N+2) SQCD models in the middle of the conformal window can be engineered by compactifying certain 6d SCFTs on three punctured spheres. The geometric construction of the 4d theories predicts numerous interesting strong coupling effects, such as IR symmetry enhancements and duality. We will discuss this interplay between simple geometric and group theoretic considerations and complicated field theoretic strong coupling phenomena. For example, one of the dualities arising geometrically from different pair-of-pants decompositions of a four punctured sphere  is an $SU(N+2)$ generalization of the Intriligator-Pouliot duality of $SU(2)$ SQCD with $N_f=4$, which is a degenerate, $N=0$, instance of our discussion. 

Thu, 11 Jun 2020
11:30
Virtual

Covers of modular curves, categoricity and Drinfeld's GT

Boris Zilber
(Oxford)
Abstract

This is a joint work with C.Daw in progress. We study the L_{omega_1,omega}-theory of the modular functions j_n: H -> Y(n). In other words, H is seen here as the universal cover in the class of modular curves. The setting is different from one considered before by Adam Harris and Chris Daw: GL(2,Q) is given here as the sort without naming its individual elements. As usual in the study of 'pseudo-analytic cover structures', the statement of categoricity is equivalent to certain arithmetic conditions, the most challenging of which is to determine the Galois action on CM-points. This turns out to be equivalent to determining the Galois action on SL(2,\hat{Z})/(-1), that is a subgroup of

Out SL(2,\hat{Z})/(-1)   induced by the action of  Gal_Q. We find by direct matrix calculations a subgroup Out_* of the outer automorphisms group which contains the image of Gal_Q. Moreover, we prove that Out_* is the image of Drinfeld's group GT (Grothendieck-Teichmuller group) under a natural homomorphism.

It is a reasonable to conjecture that Out_* is equal to the image of Gal_Q, which would imply the categoricity statement. It follows from the above that our conjecture is a consequence of Drinfeld's conjecture which states that GT is isomorphic to Gal_Q.  

 

 

eV-Scale Sterile Neutrino Search Using Eight Years of Atmospheric Muon Neutrino Data from the IceCube Neutrino Observatory
Aartsen, M Abbasi, R Ackermann, M Adams, J Aguilar, J Ahlers, M Ahrens, M Alispach, C Amin, N Andeen, K Anderson, T Ansseau, I Anton, G Argüelles, C Auffenberg, J Axani, S Bagherpour, H Bai, X Balagopal, A Barbano, A Barwick, S Bastian, B Basu, V Baum, V Baur, S Bay, R Beatty, J Becker, K Becker Tjus, J BenZvi, S Berley, D Bernardini, E Besson, D Binder, G Bindig, D Blaufuss, E Blot, S Bohm, C Böser, S Botner, O Böttcher, J Bourbeau, E Bourbeau, J Bradascio, F Braun, J Bron, S Brostean-Kaiser, J Burgman, A Buscher, J Busse, R Carver, T Chen, C Cheung, E Chirkin, D Choi, S Clark, B Clark, K Classen, L Coleman, A Collin, G Conrad, J Coppin, P Correa, P Cowen, D Cross, R Dave, P De Clercq, C DeLaunay, J Dembinski, H Deoskar, K De Ridder, S Desai, A Desiati, P de Vries, K de Wasseige, G de With, M DeYoung, T Dharani, S Diaz, A Díaz-Vélez, J Dujmovic, H Dunkman, M DuVernois, M Dvorak, E Ehrhardt, T Eller, P Engel, R Evenson, P Fahey, S Fazely, A Fedynitch, A Felde, J Fienberg, A Filimonov, K Finley, C Fox, D Franckowiak, A Friedman, E Fritz, A Gaisser, T Gallagher, J Ganster, E Garrappa, S Gerhardt, L Glauch, T Glüsenkamp, T Goldschmidt, A Gonzalez, J Grant, D Grégoire, T Griffith, Z Griswold, S Günder, M Gündüz, M Haack, C Hallgren, A Halliday, R Halve, L Halzen, F Hanson, K Hardin, J Haungs, A Hauser, S Hebecker, D Heereman, D Heix, P Helbing, K Hellauer, R Henningsen, F Hickford, S Hignight, J Hill, G Hoffman, K Hoffmann, R Hoinka, T Hokanson-Fasig, B Hoshina, K Huang, F Huber, M Huber, T Hultqvist, K Hünnefeld, M Hussain, R In, S Iovine, N Ishihara, A Jansson, M Japaridze, G Jeong, M Jones, B Jonske, F Joppe, R Kang, D Kang, W Kappes, A Kappesser, D Karg, T Karl, M Karle, A Katz, U Kauer, M Kellermann, M Kelley, J Kheirandish, A Kim, J Kintscher, T Kiryluk, J Kittler, T Klein, S Koirala, R Kolanoski, H Köpke, L Kopper, C Kopper, S Koskinen, D Koundal, P Kowalski, M Krings, K Krückl, G Kulacz, N Kurahashi, N Kyriacou, A Lanfranchi, J Larson, M Lauber, F Lazar, J Leonard, K Leszczyńska, A Li, Y Liu, Q Lohfink, E Lozano Mariscal, C Lu, L Lucarelli, F Ludwig, A Lünemann, J Luszczak, W Lyu, Y Ma, W Madsen, J Maggi, G Mahn, K Makino, Y Mallik, P Mancina, S Mariş, I Maruyama, R Mase, K Maunu, R McNally, F Meagher, K Medici, M Medina, A Meier, M Meighen-Berger, S Merz, J Meures, T Micallef, J Mockler, D Momenté, G Montaruli, T Moore, R Morse, R Moulai, M Muth, P Nagai, R Naumann, U Neer, G Nguyen, L Niederhausen, H Nisa, M Nowicki, S Nygren, D Obertacke Pollmann, A Oehler, M Olivas, A O’Murchadha, A O’Sullivan, E Palczewski, T Pandya, H Pankova, D Park, N Parker, G Paudel, E Peiffer, P Pérez de los Heros, C Philippen, S Pieloth, D Pieper, S Pinat, E Pizzuto, A Plum, M Popovych, Y Porcelli, A Prado Rodriguez, M Price, P Przybylski, G Raab, C Raissi, A Rameez, M Rauch, L Rawlins, K Rea, I Rehman, A Reimann, R Relethford, B Renschler, M Renzi, G Resconi, E Rhode, W Richman, M Riedel, B Robertson, S Rongen, M Rott, C Ruhe, T Ryckbosch, D Rysewyk Cantu, D Safa, I Sanchez Herrera, S Sandrock, A Sandroos, J Santander, M Sarkar, S Satalecka, K Scharf, M Schaufel, M Schieler, H Schlunder, P Schmidt, T Schneider, A Schneider, J Schröder, F Schumacher, L Sclafani, S Seckel, D Seunarine, S Shefali, S Silva, M Smithers, B Snihur, R Soedingrekso, J Soldin, D Song, M Spiczak, G Spiering, C Stachurska, J Stamatikos, M Stanev, T Stein, R Stettner, J Steuer, A Stezelberger, T Stokstad, R Stößl, A Strotjohann, N Stürwald, T Stuttard, T Sullivan, G Taboada, I Tenholt, F Ter-Antonyan, S Terliuk, A Tilav, S Tollefson, K Tomankova, L Tönnis, C Toscano, S Tosi, D Trettin, A Tselengidou, M Tung, C Turcati, A Turcotte, R Turley, C Ty, B Unger, E Unland Elorrieta, M Usner, M Vandenbroucke, J Van Driessche, W van Eijk, D van Eijndhoven, N Vannerom, D van Santen, J Verpoest, S Vraeghe, M Walck, C Wallace, A Wallraff, M Watson, T Weaver, C Weindl, A Weiss, M Weldert, J Wendt, C Werthebach, J Whelan, B Whitehorn, N Wiebe, K Wiebusch, C Williams, D Wills, L Wolf, M Wood, T Woschnagg, K Wrede, G Wulff, J Xu, X Xu, Y Yanez, J Yodh, G Yoshida, S Yuan, T Zhang, Z Zöcklein, M Physical Review Letters volume 125 issue 14 (30 Sep 2020)
Searching for eV-scale sterile neutrinos with eight years of atmospheric
neutrinos at the IceCube neutrino telescope
Aartsen, M Abbasi, R Ackermann, M Adams, J Aguilar, J Ahlers, M Ahrens, M Alispach, C Amin, N Andeen, K Anderson, T Ansseau, I Anton, G Argüelles, C Auffenberg, J Axani, S Bagherpour, H Bai, X V, A Barbano, A Barwick, S Bastian, B Basu, V Baum, V Baur, S Bay, R Beatty, J Becker, K Tjus, J BenZvi, S Berley, D Bernardini, E Besson, D Binder, G Bindig, D Blaufuss, E Blot, S Bohm, C Böser, S Botner, O Böttcher, J Bourbeau, E Bourbeau, J Bradascio, F Braun, J Bron, S Brostean-Kaiser, J Burgman, A Buscher, J Busse, R Carver, T Chen, C Cheung, E Chirkin, D Choi, S Clark, B Clark, K Classen, L Coleman, A Collin, G Conrad, J Coppin, P Correa, P Cowen, D Cross, R Dave, P Clercq, C DeLaunay, J Dembinski, H Deoskar, K Ridder, S Desai, A Desiati, P Vries, K Wasseige, G With, M DeYoung, T Dharani, S Diaz, A Díaz-Vélez, J Dujmovic, H Dunkman, M DuVernois, M Dvorak, E Ehrhardt, T Eller, P Engel, R Evenson, P Fahey, S Fazely, A Fedynitch, A Felde, J Fienberg, A Filimonov, K Finley, C Fox, D Franckowiak, A Friedman, E Fritz, A Gaisser, T Gallagher, J Ganster, E Garrappa, S Gerhardt, L Glauch, T Glüsenkamp, T Goldschmidt, A Gonzalez, J Grant, D Grégoire, T Griffith, Z Griswold, S Günder, M Gündüz, M Haack, C Hallgren, A Halliday, R Halve, L Halzen, F Hanson, K Hardin, J Haungs, A Hauser, S Hebecker, D Heereman, D Heix, P Helbing, K Hellauer, R Henningsen, F Hickford, S Hignight, J Hill, G Hoffman, K Hoffmann, R Hoinka, T Hokanson-Fasig, B Hoshina, K Huang, F Huber, M Huber, T Hultqvist, K Hünnefeld, M Hussain, R In, S Iovine, N Ishihara, A Jansson, M Japaridze, G Jeong, M Jones, B Jonske, F Joppe, R Kang, D Kang, W Kappes, A Kappesser, D Karg, T Karl, M Karle, A Katz, U Kauer, M Kellermann, M Kelley, J Kheirandish, A Kim, J Kintscher, T Kiryluk, J Kittler, T Klein, S Koirala, R Kolanoski, H Köpke, L Kopper, C Kopper, S Koskinen, D Koundal, P Kowalski, M Krings, K Krückl, G Kulacz, N Kurahashi, N Kyriacou, A Lanfranchi, J Larson, M Lauber, F Lazar, J Leonard, K Leszczyńska, A Li, Y Liu, Q Lohfink, E Mariscal, C Lu, L Lucarelli, F Ludwig, A Lünemann, J Luszczak, W Lyu, Y Ma, W Madsen, J Maggi, G Mahn, K Makino, Y Mallik, P Mancina, S Mariş, I Maruyama, R Mase, K Maunu, R McNally, F Meagher, K Medici, M Medina, A Meier, M Meighen-Berger, S Merz, J Meures, T Micallef, J Mockler, D Momenté, G Montaruli, T Moore, R Morse, R Moulai, M Muth, P Nagai, R Naumann, U Neer, G Nguyen, L Niederhausen, H Nisa, M Nowicki, S Nygren, D Pollmann, A Oehler, M Olivas, A O'Murchadha, A O'Sullivan, E Palczewski, T Pandya, H Pankova, D Park, N Parker, G Paudel, E Peiffer, P Heros, C Philippen, S Pieloth, D Pieper, S Pinat, E Pizzuto, A Plum, M Popovych, Y Porcelli, A Rodriguez, M Price, P Przybylski, G Raab, C Raissi, A Rameez, M Rauch, L Rawlins, K Rea, I Rehman, A Reimann, R Relethford, B Renschler, M Renzi, G Resconi, E Rhode, W Richman, M Riedel, B Robertson, S Rongen, M Rott, C Ruhe, T Ryckbosch, D Cantu, D Safa, I Herrera, S Sandrock, A Sandroos, J Santander, M Sarkar, S Satalecka, K Scharf, M Schaufel, M Schieler, H Schlunder, P Schmidt, T Schneider, A Schneider, J Schröder, F Schumacher, L Sclafani, S Seckel, D Seunarine, S Shefali, S Silva, M Smithers, B Snihur, R Soedingrekso, J Soldin, D Song, M Spiczak, G Spiering, C Stachurska, J Stamatikos, M Stanev, T Stein, R Stettner, J Steuer, A Stezelberger, T Stokstad, R Stößl, A Strotjohann, N Stürwald, T Stuttard, T Sullivan, G Taboada, I Tenholt, F Ter-Antonyan, S Terliuk, A Tilav, S Tollefson, K Tomankova, L Tönnis, C Toscano, S Tosi, D Trettin, A Tselengidou, M Tung, C Turcati, A Turcotte, R Turley, C Ty, B Unger, E Elorrieta, M Usner, M Vandenbroucke, J Driessche, W Eijk, D Eijndhoven, N Vannerom, D Santen, J Verpoest, S Vraeghe, M Walck, C Wallace, A Wallraff, M Watson, T Weaver, C Weindl, A Weiss, M Weldert, J Wendt, C Werthebach, J Whelan, B Whitehorn, N Wiebe, K Wiebusch, C Williams, D Wills, L Wolf, M Wood, T Woschnagg, K Wrede, G Wulff, J Xu, X Xu, Y Yanez, J Yodh, G Yoshida, S Yuan, T Zhang, Z Zöcklein, M Physical Review D: Particles, Fields, Gravitation and Cosmology volume 102 issue 5 (30 Sep 2020) http://arxiv.org/abs/2005.12943v2
Carathéodory Sampling for Stochastic Gradient Descent
Cosentino, F Oberhauser, H Abate, A (25 Nov 2020)

How do we design face masks that efficiently remove contaminants while ensuring that we can still breathe easily? One complicating factor with this question is the fact that the properties of the material that we start off with for our face mask can be very different when in use. A key example is seen when you stretch the mask around your face to put it on. In doing so, you also stretch the pores, i.e., the holes in the material that allow the air to pass through.

Thu, 18 Jun 2020

16:00 - 17:00

Deep Neural Networks for Optimal Execution

LAURA LEAL
(Princeton)
Abstract


Abstract: We use a deep neural network to generate controllers for optimal trading on high frequency data. For the first time, a neural network learns the mapping between the preferences of the trader, i.e. risk aversion parameters, and the optimal controls. An important challenge in learning this mapping is that in intraday trading, trader's actions influence price dynamics in closed loop via the market impact. The exploration--exploitation tradeoff generated by the efficient execution is addressed by tuning the trader's preferences to ensure long enough trajectories are produced during the learning phase. The issue of scarcity of financial data is solved by transfer learning: the neural network is first trained on trajectories generated thanks to a Monte-Carlo scheme, leading to a good initialization before training on historical trajectories. Moreover, to answer to genuine requests of financial regulators on the explainability of machine learning generated controls, we project the obtained ``blackbox controls'' on the space usually spanned by the closed-form solution of the stylized optimal trading problem, leading to a transparent structure. For more realistic loss functions that have no closed-form solution, we show that the average distance between the generated controls and their explainable version remains small. This opens the door to the acceptance of ML-generated controls by financial regulators.
 

Thu, 18 Jun 2020

16:45 - 17:30
Virtual

The algebraic structure of C*-algebras associated to groups

Matthew Kennedy
(University of Waterloo)
Further Information

Part of UK virtual operator algebra seminar: https://sites.google.com/view/uk-operator-algebras-seminar/home

Abstract

Since the work of von Neumann, the theory of operator algebras has been closely linked to the theory of groups. On the one hand, operator algebras constructed from groups provide an important source of examples and insight. On the other hand, many problems about groups are most naturally studied within an operator-algebraic framework. In this talk I will give an overview of some problems relating the structure of a group to the structure of a corresponding C*-algebra. I will discuss recent results and some possible future directions.

Subscribe to