# Seminars

## General information

The department is located at:

Ångström Laboratory, Polacksbacken, Lägerhyddsvägen 1.

Here's how to find us.

The seminars are available in several formats:

- Web: http://www.physics.uu.se/en/seminars/calendar
- iCal: http://www.physics.uu.se/sv/calendar/all/ical
- RSS-feed: http://www.physics.uu.se/en/seminars/upcoming/rss.xml

## Information about *Astronomy and Space Physics* seminars

**Usual seminar time is Thursday, 14.00 sharp (45 min talk + 15 min discussion)****Usual seminar room is***Hiorters rum*, floor 3, house 7- Group meetings:
**Planets:**Tue 15-16,**IRFU:**Wed 11-12,**Galaxies:**Fri 15-16,**Stars:**Fri 14-15 - Seminars at other Swedish institutes: Stockholm, Lund, Onsala
- Past and present IRFU seminars: 1996-present day
- Comments or inquiries regarding Astronomy and Space Physics seminars should be directed to the

seminar organizers (Andreas Korn and Eric Stempels).

## Information about *Nuclear and Particle Physics* seminars

**Usual seminar time is Thursday, 15.15 (45-50 min talk + 10-15 min discussion)****Usual seminar room is***12167*, floor 2, southern end of house 1- Comments or inquiries regarding Nuclear and Particle Physics seminars should be directed to the seminar organizer (Andrzej Kupsc and Richard Brenner).

## Information about *Theoretical Physics* seminars

**Usual seminar time is Wednesday, 13.15-14.15****Usual seminar room is***Oseenska rummet*, floor 3 house 7- Past seminars: 2003-
- Comments or inquiries regarding the Theoretical Physics seminars should be directed to the seminar organizer (Thomas Klose)

## Information about *Applied Nuclear Physics* seminars

- Comments or inquiries regarding the Applied Nuclear Physics seminars should be directed to the seminar organizer (Anna Davour)

## Information about *Materials Theory * seminars

**Usual seminar time is Friday, 12.00-12.45****Usual seminar room is***Å80101*, floor 0 house 8- Comments or inquiries regarding the "Materials Theory Friday Seminars" should be directed to the seminar organizer (Sumanta Bhandary)

Last updated 2014-05-14 13:14.

Editor: Webmaster

# Upcoming seminars

# Math of quantum fields

Starting with the simple problem of counting partitions I will illustrate how the quantum theory can explain some non-trivial mathematical facts. Then I will give a non-expert overview of recent advances in quantum field theory and their relations to interesting geometrical invariants. I will also outline some fundamental mathematical problems which are posed by quantum field theory.

# Holomorphic curves, topological string, and low-dimensional topology

We discuss relations between holomorphic curve theories, topological string, and gauge theories in low-dimensional topology. We focus

in particular on the case of knots and links in the three-sphere, where these different viewpoints complement each other and illustrate a number of

central dualities. We also explain how this case leads to problems at the forefront in both symplectic geometry: open Gromov-Witten theory and

(higher genus) Legendrian Symplectic Field Theory, and in topological string: new notions of mirror symmetry.

# Corrections Beyond the Leading Order in Processes pi0-> e+e- and pi0->e+e-\gamma

In this talk, we will discuss two important processes of low energy hadron physics: pi0 -> e+e- and the Dalitz decay of pi0.

We briefly summarize experimental and theoretical results on the rare decay pi0 -> e+e-. The analytical two-loop QED corrections together with the bremsstrahlung contribution beyond the soft-photon approximation are reviewed. Using the leading logarithm approximation, the possible contribution of QCD corrections is estimated. The complete result is then used to fit the value of the contact interaction coupling to the recent KTeV experiment. This, together with a study of the Dalitz decay pi0 -> e+e-\gamma, can be used in the theoretical calculation of the hadronic light-by-light scattering contribution in the g - 2 type experiments.