У оквиру семинара Групе за гравитацију, честице и поља Института за физику у Београду, у петак, 09. јун 2023. године у 11 часова на Институту за физику у Београду, у сали 360, Душан Ђорђевић (Физички факултет у Београду) одржаће предавање:

Holographic Aspects of Even-Dimensional Topological Gravity

САЖЕТАК:

Despite being formulated over 30 years ago, the topological gauge theory of gravity in an even number of space-time dimensions has received limited attention. In this talk, we will consider this theory (with the AdS gauge group) in the setup of holographic duality. First, we will compute the holographic one-point functions. The fact that one-point function of a spin current generally does not vanish opens up a possibility of application in the field of spin systems in three space-time dimensions. Then, we will further investigate some bulk semiclassical geometries and discuss them in the light of holography. Finally, we will discuss the two-point function in the dual-field theory using the Wilson line-like presentation of a probe point particle in the bulk.

У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 08. јуна 2023. године у 14 часова, путем Zoom платформе, Андрија Костић (Макс Планк институт за астрофизику , Гархинг, Немачка) одржаће предавање:

Forward modeling the large-scale structure — from effective field theory to dark matter constraints

САЖЕТАК:

The constraining power promised by future large-scale structure surveys has driven the development of ever better techniques for extracting cosmological information from those datasets. Increase in the expected number of modes that could be well within the reach of the theory offers an improvement of few orders of magnitude with respect to cosmic microwave background. However, this extra information is hidden within the non-linear structures and hence it is necessary to very carefully model different physics at play in order to responsibly deal with the upcoming datasets. In the talk we will present recent efforts of merging the effective field theory approach to structure formation with the field-level inference, trying to extract cosmological information Fourier mode by Fourier mode, and demonstrate their potential for modeling the upcoming data from future large-scale structure surveys. Furthermore, we will show how the field-level modeling can also offer insights into the local universe, from which constraints on dark matter can be derived. If time allows it, we will also present an interesting side product of field-level inference machinery, informing us on how future surveys should be conducted in order to more efficiently constrain cosmological models at hand.

Приступите предавању
Meeting ID: 826 8078 2532
Passcode: 524400

У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 01. јуна 2023. године у 14 часова путем Zoom платформе, др Александра Алорић (Algebra AI, Београд), одржаће предавање:

Agent-based modeling in the field of socio-economic complex systems

САЖЕТАК:

Understanding how interesting macroscopic patterns emerge out of a large number of simple microscopic interactions has been the focus of statistical physics for a very long time. In a similar vein is our desire to explain the development of macroscopic patterns at the level of society and other socio-economic systems starting from interactions of the simplest interacting elements – modeled by agents. In this talk, we will discuss several applications of agent-based models to tackle phenomena in the domains of finance, knowledge production, information transformation within communities, etc. In some cases, we can develop detailed analytical solutions in small and large population limits (questions of fragmentation in financial markets), while in others, we use numerical simulations to inform experiments. In all cases, these models allow us to learn more about the underlying systems by testing different policy strategies and investigating systems’ behavior in the domains inaccessible to experimentation.

Приступите предавању
Meeting ID: 811 8667 1554
Passcode: 971255

У оквиру семинара Института за физику у Београду, у понедељак, 29. маја 2023. године у 12 часова у сали Звонко Марић Института за физику у Београду, др Дејан Стојковић (Универзитет у Бафалу, Државни универзитет Њујорка), одржаће предавање:

Testing an alternative to quantum mechanics

САЖЕТАК:

In this talk we will present an alternative formulation of quantum mechanics, whose basic starting point is pure information represented by binary sequences, without any reference to space, time and matter. Directly from these binary sequences, we will derive highly non-trivial QM results: rules of angular momentum addition, Clebsch-Gordan coefficients and Wigner’s d-matrix formula. In particular, Wigner’s formula can be used to describe experiments with two sequential Stern-Gerlach detectors relatively rotated by some angle (which actually represents the first step toward formulating an emergent quantum spacetime). Being inherently discrete, and matching quantum mechanical predictions only in the continuous limit where the length of the sequences is infinite, this formalism can be tested with very precise state-of-the-art experiments in quantum optics.

Упоредо са престижном конференцијом LHCP, која окупља 400 физичара из целог света у Београду, Институт за физику у Београду организује јавно предавање једног од најугледнијих физичара данашњице, Џонатана Елиса, професора на Kингс колеџу у Лондону.

Јавно предавање под називом  From Little Bangs to the Big Bang  одржава се у атријуму Народног музеја, у четвртак, 25. маја 2023. године, у 14 часова.

Експерименти на Великом сударачу хадрона (LHC) у ЦЕРН-у, којима је посвећена текућа конференција, бацају светлост на бројна фундаментална питања у космологији, као што су структура и порекло видљиве материје у Универзуму, природа такозване тамне материје и будућност Универзума. Kључна улогу у овим анализама игра Хигсов бозон, јединствена и мистериозна честица која тек треба да открије своје тајне.

Предавање је отворено за публику и на енглеском језику.

Добро дошли!