Seminarium "Teoria cząstek elementarnych i kosmologia"
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2020-11-26 (Czwartek)
Zapraszamy na spotkanie o godzinie 12:15 
Hans Peter Nilles (Bonn University)Modular symmetries in Particle Physics and Cosmology
Modular symmetries might be relevant for phenomena in physics and cosmology. We sketch an application in the framework of natural inflation and then concentrate on the recent proposal of "modular flavor symmetries" that allow new insights for a unified description of masses and mixing angles of quarks and leptons.
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2020-11-19 (Czwartek)
Zapraszamy na spotkanie o godzinie 12:15
Diego Redigolo (CERN and INFN Florence)New searches for flavored axions
We discuss the theory and phenomenology of flavored axions. We show how their flavor violating couplings to the SM quarks and/or leptons open up a new experimental avenue for flavor experiments. We describe novel experimental strategies to test flavored axions and their impact in well motivated beyond the standard model scenarios addressing the strong CP problem, the origin of the DM in our Universe and the flavor puzzle.
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2020-11-05 (Czwartek)
Zapraszamy na spotkanie o godzinie 12:15
Marta Losada (New York U., Abu Dhabi)Baryogenesis in the Standard Model EFT with dim 6 terms
In this talk I present the study of Higgs boson observables at the LHC and their impact on electroweak baryogenesis in the context of Standard Model effective field theory with the inclusion of dimension 6 operators of Higgs and fermion fields. I will also discuss how these new terms can generate an electric dipole moment of leptons and thus add further constraints to produce the baryon asymmetry. I present the main results when considering a single fermion flavor term or for combinations of two flavors. For each case, the results of the identification of which observables constrain more severely the new terms and the interplay of the complementary constraints to identify viable regions of parameter space is also presented.
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2020-10-29 (Czwartek)
Zapraszamy na spotkanie o godzinie 12:15
Marek Lewicki (IFT UW)Cosmic String Interpretation of NANOGrav Pulsar Timing Data
The NANOGrav Collaboration has recently reported strong evidence for a stochastic common-spectrum process, which we interpret as a SGWB in the framework of cosmic strings. The possible NANOGrav signal would correspond to a string tension Gμ∈(4×10^{−11},10^{−10}) at the 68% confidence level, with a different frequency dependence from supermassive black hole mergers. The SGWB produced by cosmic strings with such values of Gμ would be beyond the reach of LIGO, but could be measured by other planned and proposed detectors such as SKA, LISA, TianQin, AION-1km, AEDGE, Einstein Telescope and Cosmic Explorer.
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2020-10-22 (Czwartek)
Zapraszamy na spotkanie o godzinie 12:15
Bogumiła Świeżewska (IFT UW)Phase-transition bubbles: properties and consequences
In this talk I will discuss various aspects of the appearance of bubbles during a first-order phase transition in the early Universe. I will explain why their velocity is crucial for physical observations and how to estimate it. I will also discuss a background of gravitational waves resulting from collisions of bubbles on the example of a model with classical conformal symmetry. The talk will be based on the following articles 1809.11129 and 2005.10875.
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2020-10-15 (Czwartek)
Zapraszamy na spotkanie o godzinie 12:15
Dave Sutherland (SISSA)Is SMEFT Enough?
The four scalar degrees of freedom of the Standard Model, the Higgs and the longitudinal components of the Ws and Z, are amenable to different EFT descriptions. "SMEFT" wraps them up in a single Higgs doublet, whereas "HEFT" treats the Higgs and the Goldstones separately. We identify (field redefinition invariant) features of the scalar field space manifold that can only be described by the latter HEFT, and thereby identify two classes of UV completions for which HEFT is required: i) those which contain extra sources of electroweak symmetry breaking, ii) those which contain particles getting all of their mass from electroweak symmetry breaking.
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