2 papers
astro-ph2000
Spectral Variability of QSOs in the Optical Band
Dario Trevese, Fausto Vagnetti
A new analysis of the variability of the spectral slope of PG QSOs has been performed, on the basis of recent literature data in the B and R photometric bands. Preliminary results…
hep-ph2000
The O(infty) nonlinear sigma model out of equilibrium
C. Destri, E. Manfredini
The out-of-equilibrium dynamics of the O(N+1) nonlinear sigma model in 1+1 dimensions is investigated in the large N limit. Regarding the nonlinearity as the effect of a suitable l…