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“Introduction to the TT̄ deformation”
Dr. Riccardo Conti, Turin University
June 10, 2020 (Wednesday)
Abstract: In this talk I will give a pedagogical introduction to a special irrelevant deformation of 2-dimensional Quantum Field Theories, the so-called TT̄ deformation, which has recently attracted the attention of the theoretical physics community due to the interesting links with string theory and the AdS/CFT correspondence. I will review some basic aspects of this deformation and describe the principal features of the deformed models both at classical and quantum level. Finally, I will briefly comment on other similar irrelevant deformations and present a series of interesting open questions that still wait for answers.
TMP seminar will be held on Wednesday, June 10 at 18:00. Given the situation the seminar will be arranged via Zoom.
If you want to join the seminar please register here before 15:00, June 10.
"Efficient Rules for All Conformal Blocks: A Dream Come True"
Dr. Valentina Prilepina, Laval University
May 27, 2020 (Wednesday)
Abstract: In this talk, I will lay out a set of efficient rules for computing d-dimensional global conformal blocks in arbitrary Lorentz representations in the context of the embedding space operator product expansion (OPE) formalism. With these rules in place, the general procedure for determining all possible conformal blocks is reduced to (1) identifying the relevant group theoretic quantities and (2) applying the conformal rules to obtain the blocks. The rules represent a systematic prescription for computing the blocks in a convenient mixed OPE-three-point- function basis as well as a set of rotation matrices, which are necessary to translate these blocks to the pure three-point function basis relevant for the conformal bootstrap. I will start by tracing their origin by describing some of the essential ingredients present in the formalism that naturally give rise to these rules. I will then map out the derivation of the rules, first outlining the general algorithm for the rotation matrices and then proceeding to the conformal blocks. Along the way, l will introduce a convenient diagrammatic notation (somewhat reminiscent of Feynman diagrams), which serves to encode parts of the computation in a compact form. Finally, I will treat several interesting examples to demonstrate the application of these rules in practice.
TMP seminar will be held on Wednesday, May 27 at 18:00. Given the situation the seminar will be arranged via Zoom.
If you want to join the seminar please register here before 15:00, May 27.
"The echo method for axion dark matter detection"
Dr. Ariel Arza, ITMP
May 13, 2020 (Wednesday)
Abstract: The echo method is a new idea for axion dark matter search. It relies on the stimulated decay of cold axions into two photons when a powerful beam of microwave radiation is shot to the space. From the axion decay, a feeble but detectable amount of electromagnetic radiation is received nearby the location where the outgoing beam was released. In this talk I will describe the essentials of this idea as well as the challenges for the future.
ITMP seminar will be held on Wednesday, May 13 at 18:00. Given the situation the seminar will be arranged via Zoom.
If you want to join the seminar please register here before 15:00, May 13.
"Polyvector deformations in supergravity and the string/M-theory dynamics"
Dr. Ilya Bakhmatov, ITMP
April 29, 2020 (Wednesday)
Abstract: Integrability preserving Yang-Baxter deformations of the string sigma-model have a simple supergravity description. We will review how introducing an extra bi-vector field to account for the r-matrix, one recovers the YB deformations after the simple open/closed string map. Things can be made clearer by using the formalism of double field theory, a T-duality covariant description of supergravity defined on an extended spacetime. We will discuss generalisations to the tri-vector deformations of d=11 supergravity and potential consequences for the fundamental membrane dynamics.
ITMP seminar will be held on Wednesday, April 29 at 18:00. Given the situation the seminar will be arranged via Zoom.
If you want to join the seminar please register here before 15:00, April 29.
"Review on higher-spin theories"
Dr. Dmitry Ponomarev, ITMP
April 15, 2020 (Wednesday)
Abstract: I will start by explaining what is meant by higher-spin theories. Then I will illustrate why making higher-spin fields interact is not easy. I will then review the standard no-go theorems for higher-spin interactions. Next, I will discuss different approaches to circumvent these no-go’s and review the most successful attempts. Finally, I will discuss some potentially promising directions for future research.
ITMP seminar will be held on Wednesday, April 15 at 18:00. Given the situation the seminar will be arranged via Zoom.
If you want to join the seminar please register here before 15:00, April 15.
"Some aspects of massive gravity and Horndeski theory"
prof. Mikhail S. Volkov (Université de Tours, France)
March 26, 2020 (Thursday)
Abstract: In the first part of the talk I plan to give a very brief introduction to the ghost-free massive gravity theory and then briefly describe the recent work on the theory of massive gravitons in arbitrary spacetimes. In the second part, I would like to present some new results obtained in the context of the Horndeski theory, in particular concerning the Palatini analysis of this theory.
ITMP seminar will be held on Thursday, March 26 at 16:00. Given the situation the seminar will be arranged via Skype.
If you want to join the seminar please register here before 14:00, March 26.
Доклад Марка Энно (Marc Henneaux), профессора Брюссельского Свободного университета "Asymptotic symmetries of electromagnetism and gravity".
9 октября (среда)
Марк Энно - известный физик-теоретик, профессор Брюссельского Свободного университета, директор Международного Сольвеевского института физики и химии (Бельгия), профессор Collège de France. Лауреат ряда престижных международных премий, включая Francqui Prize, Humboldt Research Award, Премию имени Н.Н. Боголюбова (ОИЯИ).
Аннотация доклада: The asymptotic symmetries of gravity and electromagnetism are remarkably rich. The talk will explain the asymptotic structure of gravity and electromagnetism in the asymptotically flat case by making central use of the Hamiltonian formalism. In particular, how the relevant infinite-dimensional asymptotic symmetry groups emerge at spatial infinity, and the extension to higher spacetime dimensions, will be discussed.
Доклад может быть интересен научным сотрудникам, студентам старших курсов и аспирантам, специализирующимся в теоретической физике. Рабочий язык - английский.
Начало в 18:00.
Адрес: Ломоносовский корпус МГУ, ауд. Г-716.