Critical exponents for the 3D O(n)–symmetric model with n > 3 are estimated on the base of six–loop renormalisation–group (RG) expansions. Simple Padé–Borel technique is used for resummation of RG series and Padé approximants [L/1] are shown to give rather good numerical results for all calculated quantities. For large n, the fixed point location gc and critical exponents are also determined di...

An external force dynamically drives an isolated mean-field Hamiltonian system to a long-lasting quasistationary state, whose lifetime increases with population of the system. For second order phase transitions in quasistationary states, two nonclassical critical exponents have been reported individually by using a linear and a nonlinear response theories in a toy model. We provide a simple way...