Wydział Fizyki UW > Badania > Seminaria i konwersatoria > Seminarium Teorii Oddziaływań Elementarnych

Seminarium Teorii Oddziaływań Elementarnych

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Zapraszamy do sali 0.06, ul. Pasteura 5 o godzinie 13:15

Chunshan Lin (Yukawa Institute for Theoretical Physics, Kyoto University)

Resonant Primordial Gravitational Waves Amplification

In my talk, I will introduce a mechanism evading Lyth bound. We minimally extend the conventional single-field inflation model in general relativity (GR) to a theory with non-vanishing graviton mass in the very early universe. During the reheating stage, the graviton mass oscillates coherently and leads to resonant amplification of the primordial tensor perturbation. After reheating the graviton mass vanishes and we recover GR.

Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 13:15

Michał Artymowski (IF UJ)

Higher order corrections to Starobinsky and Higgs inflationary models

I will consider Starobinsky and Higgs inflation with a set of higher order corrections. In the Einstein frame we have found a potential with the Starobinsky plateau, steep slope and possibly with an additional minimum, local maximum or a saddle point. I will present three types of in sationary behaviour that may be generated in this model:
i) inflation on the plateau,
ii) at the local maximum (topological inflation),
iii) at the saddle point.

Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 13:15

Moritz McGarrie (IFT UW)

Exploring SUSY and GUT in 5D

Supersymmetry, unification and extra dimensions are understood to be necessary for a complete description of all matter and forces. In this talk we explore models in which all three features arise at scales much nearer the electroweak scale than the Planck scale. We define the minimal model that unifies in 5D, compute the full one loop RGES for this theory, explore locating the standard model in the bulk or on branes and how one may achieve the observed Higgs mass with stops below 2 TeV. We also discuss the construction of a dedicated spectrum generator for such scenarios.

Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 13:15

Aleksy Bartnik (IFT UW)

Quantum fields on lattice in real time

Non-perturbative aspects of QCD are usually investigated by performing Path Integral Monte-Carlo calculations on a finite lattice with imaginary time. I propose a procedure of determining energy spectra of interacting fields discretized on a space lattice using real time: solve the Heisenberg equations of motion by a numerical procedure devised by Bender. It is orders of magnitude more efficient. Examples from Quantum Mechanics, one dimensional scalar field and two dimensional SU(2) gauge theory will be presented.

Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 13:15

(organised by IFT UW)

Astroparticle Physics in Poland

W dniach 11-13 maja 2015 roku odbędzie się organizowana przez Wydział Fizyki UW konferencja naukowa “Astrofizyka cząstek w Polsce 2015”. W konferencji wezmą udział przedstawiciele wszystkich polskich ośrodków zajmujących się badaniami na pograniczu fizyki oddziaływań elementarnych, kosmologii, astrofizyki i astronomii. Przedstawione zostaną wyniki najnowszych badań, w których uczestniczą polskie grupy doświadczalne i teoretyczne. Gościem konferencji będzie Jerome Martin z Institut d’Astrophysique de Paris, który wygłosi referat poświęcony najnowszym wynikom zebranym przez satelitę Planck i ich znaczeniu dla modeli inflacji kosmologicznej. Więcej informacji, w tym listę referatów i prezentacji plakatowych, można znaleźć na stronie http://acp15.fuw.edu.pl.

During May 11-13, 2015, the conference on Astroparticle Physics in Poland will summarise the state of research on the border of elementary particle physics, cosmology, astrophysics and astronomy. The detailed program of the conference can be found at http://acp2015.fuw.edu.pl

Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 13:15

Florian Staub (CERN)

One-Loop Flavour Observables and Two-Loop Higgs Masses for free (part 1)

After a short motivation for non-minimal SUSY models I’ll introduce a framework to study SUSY models beyond the MSSM using the Mathematica package SARAH. The main part of the talk will focus on two aspects. First, the automatized calculation of quark and lepton flavour violating observables at one-loop using the FlavorKit functionality. I’ll also discuss at short examples how the user can implement easily new Wilson coefficients and observables. Second, the calculation of two-loop Higgs masses using SARAH/SPheno for a large variety of SUSY models with the same precision public codes provide today for the MSSM. I’ll show results for the Higgs mass at two-loop in the NMSSM and the MSSM with trilinear R-parity violation.

On Tuesday 5.05.2015 there will be a tutorial on SARAH/SPheno (10:15-12:00 in room 1.40)

The second part of the seminar will also be on Tuesday, starting at 13:00 (sharp) in room 1.40.

Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 13:15

Nicolao Fornengo (INFN Turin)

Dark matter searches through anisotropies and cross-correlations

Anisotropies in the extragalactic electromagnetic emission originated from dark matter represent an emerging tool in the quest for a particle dark matter signal. These anisotropies are due to the cumulative emission from unresolved dark matter structures, which are present potentially at any scale: galaxy clusters, individual galaxies, subhalos inside galaxies. The same structures can be probed by gravitational tracers of the dark matter distribution in the Universe: this is obtained by large-scale-structure surveys, but in the future a good wealth of additional and complementary information will be available from weak lensing surveys. The study of anisotropies in the cross-correlation between dark matter signals, like gamma rays or radio waves, and gravitational tracers, namely the cosmic shear, CMB lensing and LSS distribution, will offer a novel and potentially very powerful opportunity to probe the particle physics nature of dark matter. The talk will discuss in details the features and the perspectives of the cross-correlation approach.

Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 13:15

Seishi Enomoto (IFT UW)

Influence of interactions on particle production induced by time-varying mass terms

We have investigated effects of interaction terms on non-perturbative particle production. It is well known that time-varying masses induce abundant particle production, such as the preheating theory. As our conclusion, it is possible to induce particle production even if the mass term of a particle species is not varying in time. Such particles are produced through the interactions with other fields, whose mass terms are varying due to a time-dependent background. The rather general result is that the amount of produced particles without time-dependent masses can be comparable with the particle density produced directly by the varying background if the strength of interaction terms is reasonably large. In this talk, we will explain with a simple but illustrative model and show analytic and numerical results.

Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 11:00

G. Branco, M. Rozanska, A. Ukleja, M. Quiros (organised by IFT UW)

3rd Warsaw Spring Workshop on CP Violation

3rd Warsaw Spring Workshop on CP violation will be devoted to discussions on theories of CP violation, experimental measurements of CP violation at the LHC and Belle, and the role of CP violation in cosmology.
Program of lectures:
-Monday April 13, room 1.01,
11:00-12:00, Gustavo Branco (CFTP Lisboa) - CP Violation in the Standard Model and Beyond
13:15-14:15, Maria Rozanska (INP PAS, Cracow) - CP violation studies at Belle(II)
-Tuesday April 14, room 1.40,
11:00-12:00, Artur Ukleja (NCNR, Warsaw) - LHCb results on CP violation
13:15-14:15, Mariano Quiros, (CIRAS, Barcelona) - Baryogenesis and CP violation

Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 13:15

Tomasz Bulik (OA UW)

Einstein Telescope - the next generation gravitiational wave observatory

During the seminar I will describe the Einstein Telescope project and its science potential. I will also present the Polish participation in the preparation of the project.

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