title: Information geometry and quantum phase transitions in the Dicke model.
abstract: We study information geometry of the Dicke model, in the thermodynamic limit. The scalar curvature R of the Riemannian metric tensor induced on the parameter space of the model is calculated. We analyze this both with and without the rotating wave approximation, and show that the parameter manifold is smooth even at the phase transition, and that the scalar curvature is continuous across the phase boundary.
authors.affiliation: Department of Physics, Indian Institute of Technology, Kanpur 208016, India. deyanshu@iitk.ac.in
authors.forename: Anshuman
authors.initials: A
authors.lastname: Dey
authors.forename: Subhash
authors.initials: S
authors.lastname: Mahapatra
authors.forename: Pratim
authors.initials: P
authors.lastname: Roy
authors.forename: Tapobrata
authors.initials: T
authors.lastname: Sarkar