HECAP

Europe/Rome 2018-07-05 14:30:00 2018-07-05 16:00:00 Galactic Rotation Curves vs. Ultra-Light Dark Matter Abstract. Bosonic ultra-light dark matter (ULDM) would form cored density distributions at the center of galaxies. These cores, seen in numerical simulations, admit analytic description as the lowest energy bound state solution ("soliton") of the Schroedinger-Poisson equations. Numerical simulations of ULDM galactic halos found an empirical scaling relation between the mass of the large-scale host halo and the mass of the central soliton. We show that this relation predicts that the peak circular velocity, measured for the host halo in the outskirts of the galaxy, should approximately repeat itself in the central region. Contrasting this prediction to the measured rotation curves of well-resolved near-by galaxies, we show that ULDM in the mass range m ~ (10-22 - 10-21) eV, which has been invoked as a possible solution to the small-scale puzzles of CDM, is in tension with the data. ICTP ICTP pio@ictp.it 5 Jul 2018

Europe/Rome 2018-07-10 14:30:00 2018-07-10 16:00:00 Topological measures for the search of exotic features in the light of Universe Abstract. In principle, we expect that our cosmos has experienced a series of complicated phase transitions. Exploring the corresponding consequences and discriminating between various types of mentioned phase transitions are therefore of interest not only from theoretical approaches but also from observational points of view. In this talk, relying on an extensive simulation of cosmic strings networks, I examine the CMB random field induced by a typical topological defects which is so-called cosmic strings as a part of ISW phenomenon. I will use various robust topological measures accompanied by some multi-scale reductions to quantify our ability to detect the probable cosmic strings networks. To this end I also utilize extensive Machine learning algorithm to find best feature sequences which are more sensitive for searching such one-dimensional defect. Based on arXiv:1710.00173 / arXiv:1801.04140 ICTP ICTP pio@ictp.it 10 Jul 2018

Europe/Rome 2018-07-26 14:30:00 2018-07-26 16:00:00 Title to be announced ICTP ICTP pio@ictp.it 26 Jul 2018

Europe/Rome 2018-06-25 08:00:00 2018-07-13 22:00:00 The 5th Biennial African School of Fundamental Physics and Applications | (smr 3216) For more information please visit: http://www.africanschoolofphysics.org/asp2018/ - Namibia ICTP pio@ictp.it 25 Jun 2018 - 13 Jul 2018

Europe/Rome 2018-07-02 08:00:00 2018-07-07 22:00:00 School on Supersymmetric Localization, Holography and Related Topics | (smr 3256) The AdS/CFT correspondence conjectures an exact equivalence between string theories in anti-de-Sitter space and gauge theories. This correspondence and its generalizations allow one to address difficult problems of strongly coupled field theory dynamics - such as the computation of Wilson loops - using weakly coupled gravity. The other way around, it also allows one to tackle fundamental questions of gravity - such as the quantum entropy of black holes - using field theoretic methods. A very important theoretical development of the last decade has been the advent of exact results in supersymmetric field theories using the methods of localization. These methods often reduce path-integrals to finite-dimensional integrals, which in many situations can be computed exactly. Being exact, localization results are most fruitfully applied at strong coupling, and thus provide a powerful framework for producing and exploiting AdS/CFT results. In particular, the interplay of localization and the AdS/CFT correspondence provides a fertile ground to answer precise questions about the entropy of string theoretic black holes and the expectation values of Wilson loops. This School aims to provide the necessary knowledge to work at the interface of supersymmetric localization and holography, through a series of pedagogical lectures by individual speakers. The activity is intended for students in theoretical physics or mathematics and postdocs with knowledge of quantum field theory, general relativity and string theory. TOPICS:   Supersymmetric localization 4D N=2 supergravity AdS black hole entropy Localization in supergravity Wilson loops Quantum entropy of black holes LECTURERS include: Francesco BENINI (SISSA) Joao GOMES (University of Amsterdam) Sameer MURTHY (King's College London) Ioannis N. PAPADIMITRIOU (KIAS) Diego TRANCANELLI (University of São Paulo) Stefan VANDOREN (Utrecht University) Alberto ZAFFARONI (Milano-Bicocca) The School will be followed by a focused Workshop on Supersymmetric Localization and Holography: Black Hole Entropy and Wilson Loops (smr3227) from 9 to 13 July (http://indico.ictp.it/event/8326), with the goal of bringing together experts in the areas of localization and holography, to provide cross fertilization and outline key directions for the future. There is no registration fee for this activity. ICTP ICTP pio@ictp.it 2 Jul 2018 - 7 Jul 2018

Europe/Rome 2018-07-02 08:00:00 2018-07-06 22:00:00 Conference on Shedding Light on the Dark Universe with Extremely Large Telescopes | (smr 3218) This Conference will bring together an international group of experts to review the current state of the art in the study of dark energy and dark matter and discuss how best to use giant telescopes to learn about their fundamental nature.  It is the third of a series of three conferences: more information can be found at https://conferences.pa.ucla.edu/dark-universe/index.html Invited Speakers include: Mariangela Bernardi (UPenn) Rebecca A. Bernstein (Carnegie Observatories) Simon Birrer (UCLA) Stefano Borgani (Trieste Observatory) Marusa Bradac (UCDavis) Tirthankar Roy Choudhury (TIFR) Michele Cirasuolo (European Southern Observatory) Stefano Cristiani (Trieste Observatory) Arianna di Cintio (IAC - Instituto de Astrofísica de Canarias) Christophe J. Dumas (TMT International Observatory) Isobel Hook (Lancaster U.) Lucas Macri (Texas A&M U.) John McKean (ASTRON/Kapteyn Astronomical Institute) Stefano Profumo (UCSC) Piero Rosati (UNIFE) Robyn Sanderson (Caltech) Anze Slosar (Brookhaven) Tommaso Treu (UCLA) Simona Vegetti (MPA, Garching) Matteo Viel (SISSA) Mark Vogelsberger (MIT) John K. Webb (U. of New South Wales) NOTE: The Conference will be preceded by the Summer School on Cosmology 2018 (smr3213, 18 - 29 June). There is no registration fee for this activity.   ICTP ICTP pio@ictp.it 2 Jul 2018 - 6 Jul 2018

Europe/Rome 2018-07-09 08:00:00 2018-07-13 22:00:00 Workshop on Supersymmetric Localization and Holography: Black Hole Entropy and Wilson Loops | (smr 3227) The AdS/CFT correspondence conjectures an exact equivalence between string theories in anti-de-Sitter space and gauge theories. This correspondence and its generalizations allow one to address difficult problems of strongly coupled field theory dynamics - such as the computation of Wilson loops - using weakly coupled gravity. The other way around, it also allows one to tackle fundamental questions of gravity - such as the quantum entropy of black holes - using field theoretic methods. A very important theoretical development of the last decade has been the advent of exact results in supersymmetric field theories using the methods of localization. These methods often reduce path-integrals to finite-dimensional integrals, which in many situations can be computed exactly. Being exact, localization results are most fruitfully applied at strong coupling, and thus provide a powerful framework for producing and exploiting AdS/CFT results. In particular, the interplay of localization and the AdS/CFT correspondence provides a fertile ground to answer precise questions about the entropy of string theoretic black holes and the expectation values of Wilson loops. This Workshop aims to bring together experts in the areas of supersymmetric localization and holography, to provide cross fertilization and outline key directions for the future. INVITED SPEAKERS include: Nikolay BOBEV (KU Leuven) Cyril N. CLOSSET (CERN) Diego H. CORREA (UNLP-CONICET) Justin R. DAVID (IISc Bangalore) Bernard de WIT (Utrecht University) Nadav DRUKKER (King's College London) Rajesh GUPTA (King's College London) Kiril HRISTOV (Bulgarian Academy of Sciences) Camillo IMBIMBO (University of Genova) Imtak JEON (Harish-Chandra Research Institute) Dietmar KLEMM (INFN Milano) Alberto LERDA (INFN Torino) James LIU (University of Michigan) Kumar S. NARAIN (ICTP) Ioannis N. PAPADIMITRIOU (KIAS) Nicolo' PIAZZALUNGA (SCGP Stony Brook) Soo-Jong REY (Seoul National University) Valentin REYS (Milano-Bicocca) Guillermo A. SILVA (National University of La Plata) Konstantinos SKENDERIS (University of Southampton) James SPARKS (University of Oxford) Chiara TOLDO (UC Santa Barbara) Cumrum VAFA (Harvard University) Brian WILLETT (UC Santa Barbara) Itamar YAAKOV (Kavli IPMU) Maxim ZABZINE (Uppsala University) The Workshop will be preceded by a School on Supersymmetric Localization, Holography and Related Topics (smr3256) from 2 to 7 July (http://indico.ictp.it/event/8560), with the goal of providing the necessary basic knowledge through a series of pedagogical lectures by individual speakers. The activity is intended for students in theoretical physics or mathematics and postdocs with knowledge of quantum field theory, general relativity and string theory. There is no registration fee for this activity. ICTP ICTP pio@ictp.it 9 Jul 2018 - 13 Jul 2018