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Angle resolved photoemission experiments by Kanigel, et al (cond-mat/0605499)[Nature Physics 2, 447 (2006)] have made a remarkable observation that lowenergy electronic excitations in the normal state of underdoped cupratesuperconductors exist on open ``Fermi arcs'' instead of a closed Fermi surface.These arcs shrink upon cooling, with the arc length appearing to extrapolate tonodal points at zero temperature. We show that this striking non-Fermi liquidbehavior could result from the underdoped normal state above Tc lying in thevicinity of a quantum phase transition between a d-wave superconductor and acorrelated insulating phase.Comment: 4+ pages, 4 eps figures (significantly revised draft including  spectral function plots - submitted to PRB

Temperature dependent Fermi arcs in the normal state of the underdoped cuprate superconductors