Marchetti gave invited talk at Winter Conference Posted on February 5, 2018 by pcs2000 Cristina Marchetti gave an invited talk at the Aspen Winter Conference Fundamental Problems in Active Matter, held at the Aspen Center for Physics Jan 29-Feb 2, 2018 http://fpam.msc.univ-paris-diderot.fr Marchetti’s talk titled, Rigidity and flocking transitions in dense tissues