Speaker
Dr
Diego Lonardoni
(MSU)
Description
The onset of hyperons in the core of neutron stars and the consequent softening of the equation of state have been questioned for a long time. We tackle the problem within a quantum Monte Carlo computational scheme. We first show that a repulsive three-body hyperon-nucleon force is needed to correctly describe the systematics of Λ-hypernuclei [1,2,3]. Then, we employ the same potential to determine the equation of state and the mass-radius relation of an infinite system of neutrons and Λ particles [4]. We find dramatic effects on the predicted maximum mass depending on the details of the three-body hyperon-nucleon force. Our results suggest that stronger constraints on the hyperon-neutron force are necessary in order to properly assess the role of hyperons in neutron stars.
This work is supported by the U.S. Department of Energy, Office of Nuclear Physics, under the NUCLEI SciDAC grant. Computer time was made available by the National Energy Research Scientific Computing Center (NERSC), which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
[1] D. Lonardoni, S. Gandolfi, F. Pederiva, Phys. Rev. C 87, 041303(R) (2013)
[2] D. Lonardoni, F. Pederiva, S. Gandolfi, Phys. Rev. C 89, 014314 (2014)
[3] F. Pederiva, F. Catalano, D. Lonardoni, A. Lovato, S. Gandolfi, arXiv:1506.04042 (2015)
[4] D. Lonardoni, A. Lovato, S. Gandolfi, F. Pederiva, Phys. Rev. Lett. 114, 092301 (2015)
Primary author
Dr
Diego Lonardoni
(MSU)
