The observable long-time behavior of an isolated many-body system after a quantum quench is considered, i.e., eigenstate (or equilibrium ensemble) some pre-quench Hamiltonian $H$ serves as initial condition which then evolves in time according to post-quench $H_p$. Absence thermalization analytically demonstrated for large class quite common pre- and spin Hamiltonians. main requirement that the...

At the end of 2007, the fi nancial press celebrated that the São Paulo Stock Exchange (Bovespa) had successfully promoted the issue of new shares for 27 companies in that year alone. Abetted by low interest rates and improvements in corporate governance, corporations in Brazil had accomplished what seemed to be an all-time record number of initial public off erings (IPOs) in a single year. 1 Ye...