CPT

Calendar of Physics Talks Vienna

The topology of deformation quantization
Speaker:Odul Tetik (University of Vienna)
Abstract:I will motivate the study of disk algebras from deformation quantization and report on some tangential progress.
Date: Tue, 17.12.2024
Time: 14:00
Duration: 60 min
Location:Erwin-Schroedinger-Hoersaal, 1090 Vienna, Boltzmanngasse 5, 5th floor
Contact:S. Fredenhagen, M. Sperling

Gauge Theory Bootstrap: Pion amplitudes and low energy parameters
Speaker:Yifei He (ENS, Paris)
Abstract:We propose the Gauge Theory Bootstrap -- a method to compute the pion S-matrix that describes the low energy physics of the strong interaction and other similar gauge theories. Using this method, we compute pion scattering phase shifts for all partial waves with angular momentum l<=3 up to 2 GeV and calculate the low energy chiPT coefficients L_{1,2,4,6} . The method looks for the most general S-matrix that matches at low energy the tree level amplitudes of the non-linear sigma model and at high energy, QCD sum rules and form factors. This is a theoretical/numerical calculation that uses as only data the pion mass m_π , pion decay constant f_π and the QCD parameters N_c =3, N_f =2, m_q and alpha_s . All results are in reasonable agreement with experiment. In particular, we find the rho(770), f_2 (1270) and rho(1450) resonances and some initial indication of particle production near the
Date: Tue, 17.12.2024
Time: 16:15
Duration: 60 min
Location:Erwin-Schroedinger-Hoersaal, 1090 Vienna, Boltzmanngasse 5, 5th floor
Contact:A. Hoang, M. Procura