Speaker
Roberto Dionisio
(University of Pisa, INFN sez. di Pisa)
Description
We present a first lattice study of the momentum-dependent real-time topological transition rate in quenched QCD. In full QCD, this quantity plays an important role in determining the hot axion abundance. The rate is obtained by reconstructing the relevant spectral function from Euclidean topological charge density correlators using the Hansen–Lupo–Tantalo (HLT) method. We present results from simulations of the Wilson gauge action up to $N_\tau=16$, and discuss the extrapolations required to control the continuum, zero-smoothing, and zero-smearing limits. The employed volumes provide access to momenta as large as $p/T\sim 8$.
Authors
Dr
Alessandra Valentino
(University of Pisa)
Andrea Giorgieri
(University of Pisa, INFN)
Dr
Claudio Bonanno
(ITP, University of Bern)
Francesco Sanfilippo
(INFN Roma Tre)
Giuseppe Gagliardi
Massimo D'Elia
(University of Pisa)
Roberto Dionisio
(University of Pisa, INFN sez. di Pisa)