I will start with a short story, hopefully entertaining.Then I will discuss the general philosophy of precision computations of Lamb shifts using QED, based in particular on the works of Shabaev and Pachucki. I will explain two kinds of effective Hamiltonians. Then I will discuss the formalism of time-ordered and 2-times Green's functions. Finally, if there is still time, I will say about the structure of QED and possible perturbative approaches, which re relevant for te bound state computations.

Sali Duża Teoretyczna, Hoża 69 at 14:15

Adrian Lewandowski (IFT UW)

Renormalization group improvement of the effective potential

Sali Duża Teoretyczna, Hoża 69 at 14:15

Andrea Dapor (IFT UW)

Coherent State Quantization of Cosmology

I will give an introduction to integral quantizations, with stress on the quantization of a particle in 1 dimension in terms of coherent states of Heisenberg group. The same formalism will then be applied to the quantization of homogeneous isotropic cosmology (the only difference being the replacement of Heisenberg group with the Affine group). I will show how this simple procedure leads to a quantum theory in which the initial Big Bang singularity is removed, and how the semiclassical limit can be naturally estracted.

Sali Duża Teoretyczna, Hoża 69 at 14:15

Michał Wrochna (Université Paris-Sud 11)

Quantization of the Maxwell field on curved spacetime - an up-to-date review

Sali Duża Teoretyczna, Hoża 69 at 14:15

Satoshi Nawata (NIKHEF, Amsterdam)

Chern–Simons theory, quantum knot invariants, and volume conjectures (Part II)

I will give an introductory talk on relations between quantum knot invariants and Chern–Simons theory. The seminal paper by Witten showed that Chern–Simons theory provides a natural framework for the study of 3‐manifolds and knot invariants. I will explain how the path integral formulations of invariants in Chern–Simons theory has led to rigorous formulations in mathematics. In addition, I will mention about the volume conjecture which relates quantum knot invariants to geometry of knot complements in S^3. The talk is supposed to be accessible to both mathematicians and physicists.

Sali Duża Teoretyczna, Hoża 69 at 14:15

Antonia Zipfel (FUW)

On the properties and solutions of the Hamiltonian constraint in LQG

Sali Duża Teoretyczna, Hoża 69 at 14:15

Adrian Lewandowski (IFT UW)

Renormalization group equation and its application to the effective potential

Sali Duża Teoretyczna, Hoża 69 at 14:15

Krzysztof Meissner (IFT UW)

Black Hole Entropy

I will discuss the original Bekenstein Hawking formula for entropy, its derivation within the Euclidean Schwarzschild solution and within Loop Quantum Gravity and the mysterious fact of extremely low entropy of our Universe.

Sali Duża Teoretyczna, Hoża 69 at 14:15

Jan Dereziński (KMMF UW)

Vector quantum fields

Sali Duża Teoretyczna, Hoża 69 at 14:15

Martin Bojowald

What happened before the big bang?

The standard model of cosmology suggests that the universe started with a phase of very high density, described by general relativity as a singularity. Quantum gravity attempts to resolve the singularity by a more fundamental, microscopic theory whose equations remain valid and could tell us what happened at or even before the big bang. This talk reviews one approach, loop quantum gravity, and discusses several surprising new results that shed light on the structure of quantum space-time, with implications for mathematical modelling and conceptual questions in cosmology.

Sali Duża Teoretyczna, Hoża 69 at 14:15

Jędrzej Świeżewski (IFT UW)

Some properties of the irrotational dust

Sali Duża Teoretyczna, Hoża 69 at 14:15

Jacek Puchta (IFT UW)