Speaker
Dr
Takashi Inoue
(Nihon University, Coffege of Bioresource Sciences)
Description
We extract hyperon forces from QCD on lattice by means of the HAL QCD method,
and then apply them to hyperons in nuclear matter.
Hyperon forces are interesting in many aspects. First, they are in the company of nuclear force. Therefor, it is necessary to know them in order to completely understand baryon-baryon interactions including nuclear force, e.g. why nuclear force has a strong repulsion at short distances and so on. However, hyperon forces are not revealed enough yet due to a shortage of experimental data.
Second, hyperon forces are essential for physics of neutron star. High density baryonic matter is naturally expected to contain hyperons with a sizable fraction. However, recent discovery of massive neutron stars indicate a hard equation of state of neutron star matter, which is difficult to explain theoretically with a baryonic matter containing hyperons. This is one of the most challenging puzzle in modern physics.
Conventionally, hyperon interactions are studied in models, e.g. meson exchange model. Though, there are uncertainties in the resulting interactions due to a deficiency of input data. A powerful method was invented in 2006 to extract nucleon-nucleon interaction from QCD on lattice. This HAL QCD method has been improved and widely extended to many other systems including general two-baryon systems. Namely, nowadays hyperon interactions can be derived from QCD without consulting experimental data.
In my talk, first I will explain essence of the HAL QCD method. Then, I will show hyperon S-wave interaction potentials derived from QCD at almost the physical point. Finally, I will show some results of application of the QCD hyperon forces, including hyperon single-particle potentials in nuclear matter.
Primary author
Dr
Takashi Inoue
(Nihon University, Coffege of Bioresource Sciences)
