DR. SUMAN GHOSH

The speaker will investigate a new kind of quantum phase transition which arises due to the presence of linear, higher spatial derivatives corresponding to the order parameter. Around the critical point, when the dispersion relation changes from linear to non-linear, there is a fundamental change in the vacuum state leading to a change in the scaling of entanglement entropy. The speaker will show that this change is a culmination of two --- kinematical and dynamical --- effects and will also discuss the implication of his work for 2-D condensed matter systems, black-hole entropy and models of quantum gravity.