Seminarium Zakładu Fizyki Teoretycznej

Two topics in QCD spin

After a general introduction to QCD spin physics and nucleon spin decomposition, I will talk about two recent developments in this field. First, I discuss a novel connection between the nucleon electric dipole moment (EDM) and polarized Deep Inelastic Scattering (DIS). I argue that the matrix element of the CP-violating Weinberg operator is related to certain higher-order corrections in polarized DIS. Second, I discuss the small-x behavior of polarized parton distribution functions and orbital angular momentum distributions within the framework of double logarithmic resummation in QCD.

A discussion on the flavor anomalies

In this talk I will review the status of flavor physics after the first and second run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics.


Best regards,
T. Altinoluk, M. Kowal, P. Małkiewicz, E. Sessolo, P. Zin


The de Broglie--Bohm Approach to Quantum Cosmology

We review the de Broglie--Bohm quantum theory, an alternative description of quantum phenomena in accordance with all the quantum experiments already performed. It is a dynamical theory about objectively real trajectories in the configuration space of the physical system under investigation, where probabilities of outcomes are not essential. Hence, it can be applied to single closed systems, being suitable for Cosmology. The emerging cosmological models are usually free of singularities, with a bounce connecting a contracting era with an expanding phase, which we are now observing.

Modifying the geometry of the Universe

The nature of dark energy is the biggest problem in cosmology. But the answer may not be very different to what most cosmologists assume. General relativity is not a complete theory. It leaves many important questions unanswered, including the nature of gravitational energy. This is directly relevant to an important observational fact: the Universe is a very inhomogeneous cosmic web on the small scales on which general relativity is actually tested.

The Flavor of UV Physics

New physics not far above the TeV scale should leave a pattern of virtual effects in observables at lower energies. What do these effects tell us about the structure of a UV theory? We will address this question by considering the Standard Model as an Effective Field Theory, which allows us to relate physics at different energy scales through the renormalization group. I will show how to deduce possible features of a UV theory by combining top-quark observables at the LHC with bottom observables at the flavor factories.


Best regards,


Quantum Simulators of Lattice Gauge Theories

In my talk I present a review of recent developments in the area of quantum simulators (QS) of lattice gauge theories. I will start with explaining what quantum simulators are, and will discuss various platform for and paradigmatic examples of QS. I will spend some time to explain how can one realize artificial static gauge fields in systems of trapped ultracold atoms, atoms in optical lattices and in synthetic dimensions. Finally, I will focus on  quantum simulators of lattice gauge theories and dynamical gauge fields, and present four examples:

Singularity theorems: A critical appraisal

The 2020 Nobel prize in Physics has revived the interest in the singularity theorems and, in particular, in the Penrose theorem published in 1965. In this talk I will briefly review the main ideas behind the theorems and I will proceed to an evaluation of their hypotheses and implications. I will try to dispel some common misconceptions about the theorems and their conclusions, as well as to convey some  of their rarely mentioned consequences. Several examples will be used for illustrative purposes.


Wojciech Kamiński (IFT FUW)

Lattice gauge theories and cold atomic mixtures

In the fundamental laws of physics, gauge fields mediate the interaction between charged particles. An example is quantum electrodynamics—the theory of electrons interacting with the electromagnetic field—based on U(1) gauge symmetry. Solving such gauge theories is in general a hard problem for classical computational techniques. While quantum computers suggest a way forward, it is difficult to build large-scale digital quantum devices required for complex simulations. In this talk, I will present our work on analog quantum simulators of a U(1) gauge theory in one spatial dimension.