Seminarium Zakładu Fizyki Teoretycznej
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:
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)
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.
Galaxy clusters and super-clusters can be used to test cosmological models, in particular big enough objects at low redshifts would be a strong indication of the failure
In my talk I will first briefly describe quantum gravity and characterize quantum gravity effects. Then I will argue that although it does not seem
feasible to observe quantum gravity effects directly, we could, or will be able in a near future, experimentally test deviations from the standard
physics of the quantum gravitational origin. I will present some effects of this kind and argue that quantum gravity phenomenology is possible
and can be fruitfully explored.
What is interaction and when does it occur? Intuition suggests that the necessary condition for the interaction of independently created particles is their direct touch or contact through physical force carriers. In quantum mechanics, the result of the interaction is entanglement — the appearance of non-classical correlations in the system. It seems that quantum theory allows entanglement of independent particles without any contact. The fundamental identity of particles of the same kind is responsible for this phenomenon.
In my presentation I will overview selected modern techniques of calculating scattering amplitudes in Quantum Chromodynamics in a non-technical and rather basic manner. The modern methods allow not only to increase the
precision of calculations, needed to test the theory in high energy experiments, but they also can change our fundamental understanding of the theory of strong interactions.