Liang 研究室
Haozhao Liang 准教授

1 Research backgroundAtomic nuclei, composed of protons and neutrons, represent one fundamental hierarchy of matter. As famous for Nihonium (Element 113), Japanis one of the world-leading countries in nuclearphysics. Questions like
• How many different kinds of nuclei exist in
the Universe?
• Where and how are they created?
• How can human being make the best andsafe use of nuclei?
motivate us for chasing deep understandings ofnuclear properties.
Theoretical studies in nuclear physics are nottrivial at all, because each atomic nucleus is aquantum system, a many-body system, a finitesystem, as well as an open system. In addition, inatomic nuclei, three fundamental interactions outof four—the strong, weak, and electromagnetic
interactions—interplay each other in a large rangeof time and energy scales with the co-existence of
single-particle and collective characteristics.
Because of these unique features, although microscopic nuclear theories could be traced backto, e.g., the Nobel Prize work of Yukawa, there
still exist tons of open questions in this field.
2 Recent research themes
In particular, during the past decades, thanks
to the significant progress in quantum many-bodytheories and the worldwide exponential increaseof computational powers, microscopic nuclear theories are gradually established, including the abinitio approach, cluster method, shell model, density functional theory (DFT), and so on.
The main research theme in our group is nuclear DFT, which aims at understanding both
ground-state and excited-state properties of thousands of nuclei in a consistent and predictive way.
Among the microscopic nuclear theories, now, evenin the visible future, only DFT is applicable to almost the whole nuclear chart.
Research themes in the recent 3 years:
Microscopic foundation of nuclear DFT• Functional Renormalization Group and DFT• Inverse Kohn-Sham method and density functional perturbation theory• Nucleon finite-size effects on nuclear binding• Relativistic ab initio calculations for finitenuclei
Consistent nuclear database for astrophysical nucleosynthesis study• Nuclear mass and β-decay half-life predictions with Bayesian approaches• Influence of nuclear mass uncertainties onradiative neutron-capture rates
3 Future perspectives
A mid-term goal: Ab initio nuclear DFT
One of our goals in the coming years is to develop an ab initio nuclear DFT, starting from realistic nuclear force. Oriented by quantum field
theory (QFT), our ideas include (i) the energy
density functional will be derived from the effective action with Legendre transform, (ii) thenon-perturbative nature of nuclear force will behandle by the renormalization group with flow
equations, and (iii) the theoretical uncertainties
will come with the idea of effective field theorywith proper power counting, as illustrated here.

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A long-term dream: Microscopic understanding of quantum many-body tunneling
Nuclear fission and fusion, which critically depend on the properties of quantum many-bodytunneling, are still among the most long-standing
and most challenging problems in nuclear physics.
The relevant studies are crucial not only for nuclear physics but also for the element cycling inastrophysical nucleosynthesis, the treatment oflong-lived fission products by nuclear power plants.
Will modern QFT help? Will machine learningand quantum computing help? These are questions for young students with dreams.