The physics of the stripe quantum critical point in the superconducting cuprates

We elaborate on several observable consequences of the Quantum-Critical-Poi nt scenario. In particular we show that the strong k-dependent scattering o f the quasiparticles with the quasi-critical charge and spin fluctuations r eproduces the main features of the low-energy spectral weights and of the o bserved Fermi surfaces. In the underdoped cuprates the attractive k-depende nt charge scattering drives the formation of the pseudogap at the M points below the crossover temperature T*. In this context we discuss models for p seudogap formation with relevant scattering in the particle-particle and pa rticle-hole channels. The experimental consequences for the pair-fluctuatio n and for the pseudogap behavior are investigated.