Andrea Campoleoni(Albert Einstein Institute, Potsdam-Golm)
We show that the asymptotic symmetries of higher-spin gauge theories coupled to 3D gravity with a negative cosmological constant correspond to non-linear W-algebras. To this end, we first present a description of these couplings in terms of G x G Chern-Simons actions. Then we identify the asymptotically AdS solutions of the field equations and we show that their asymptotic symmetries are given by two copies of a centrally extended W-algebra selected by the gauge group G. The central charge is the one identified by Brown and Henneaux in pure gravity.
Prof. Akira Endo(Forschungszentrum Dresden-Rossendorf (FZD), Německo)
High average power is the key requirement for a laser driver, employed in a compact X-ray generation device. Three different types of high average power, short pulse Yb doped solid state laser technologies are compared each other, namely fiber, thin disc and bulk, on the thermal management to scale its average power more than 1kW at various repetition pulse rate.
