Time, Place:

11:15 ,Seminar room 242, Bothe Lab

Speaker:

Dr. Sergey Volkov, MPIK

Title:

Two-loop vacuum polarization in the Coulomb field of a nucleus

Time, Place:

09:30 ,Zentraler Seminarraum / Central seminar room (library)

Speaker:

Tobias Schmitt & Romain Dubroeucq

Title:

Dual Comb Spectroscopy for Atmospheric Greenhouse Gas Measurements in Heidelberg

Time, Place:

11:00 ,Grosser Hoersaal/Big Lecture Hall (library)

Speaker:

Professor Ulrich Uwer, Professor Vincenzo Vagnoni

Title:

Precision Physics at a Hadron Collider: Highlights from the LHCb-Experiment

Since the start of the Large Hadron Collider (LHC) the LHCb experiment has become the leading flavour physics experiment worldwide. Initially designed to probe the matter-antimatter asymmetry of the universe by precision measurements of CP violation in heavy flavour decays, it continuously expanded its physics portfolio to cover also QCD and electroweak physics, the study of heavy ion collisions and most recentlyalso fixed target physics. The kolloquium will start with a presentationof highlights from flavour- and electroweak physics, the second partwill focus on strong interactions and new exotic states found by the experiment.

Time, Place:

11:15 ,Seminar room 242, Bothe Lab

Speaker:

Ingmar Kloß, MPIK

Title:

Geometrical reconstruction of Dirac solutions: gravitational interactions and comparison to electromagnetic case

Time, Place:

11:15 ,Grosser Hoersaal/Big Lecture Hall (library)

Speaker:

Prof. Wim Ubachs

Title:

Molecular hydrogen at the heart of physics

Hydrogen in atomic and molecular form, including the deuterium and tritium isotopes, is key in astrophysics, as well as in stellar and man-made fusion. Hydrogen has become a benchmark system for testing theory at the most fundamental level and for probing physics beyond the Standard Model: are there forces beyond the three included in the Standard Model of physics plus gravity, and are there just 3+1 dimensions. Comparison of laboratory wavelengths of transitions in hydrogen may be compared with the lines observed during the epoch of the early Universe to verify whether fundamental constants of Nature have varied over cosmological time. In recent studies dissociation limits of H2, HD and D2 are measured to 10-digit accuracy. Currently vibrational transitions are being measured via sensitive cavity-enhanced techniques, also for the radio-active HT molecule. In H2 record-high sensitivity is achieved for probing a quadrupole transition in saturation.