Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268


Fri., October 20, 2017, at 3:00 PM - 4:00 PM (refreshments served at 2:40 PM)

Tidal Deformation in Neutron Stars and the Physics of Dense Matter

Andrew W. Steiner, University of Tennessee, Knoxville, TN
Bldg. 6008 Large Conference Room

The moon changes sea levels due to tidal forces, and these tidal forces also deform the earth's solid crust. In general, all objects have a tidal deformability which describes the extent to which they deform in the presence of a gravitational field. This deformability is analogous in some ways to an the electric polarizability observed in nuclei. In this talk, I will give our predictions for the neutron star tidal deformability and review how these predictions are connected to the nucleon-nucleon interaction. In essence, more repulsion between nucleons leads to larger neutron star radii, lower central densities, and thus larger tidal deformability's. I will discuss how LIGO's recent neutron star merger observation generates an upper limit for the neutron star tidal deformability and how that upper limit is close to the upper end of our predicted range. Finally, I will briefly talk about what this might mean for the amount of r-process material that mergers can generate.

Contact: Alfredo Galindo-Uribarri, (865) 574-6124