arXiv subjects

Jae Hwang Lee

Publications and source records attributed to Jae Hwang Lee.

3 recordsLinked to original sources

arXiv2024

Quantum Modules of Semipositive Toric Varieties

A smooth projective toric variety $X=X_Σ$ has a geometric quotient description $V /\!/ T$. Using $2|1$-pointed quasimap invariants, one can define a quantum $H^*(T)$-module $QM(X)$, which deforms a natural module structure given by the Kirwan map $H^*(T) \rightarrow H^*(X)$. The Batyrev ring of $X$, defined from combinatorial data of the fan $Σ$, has its natural module structure given by the quotient of a polynomial ring, say BatM$(X)$. In this paper, we prove that $QM(X)$ and BatM$(X)$ are naturally isomorphic when $X$ is semipositive.

math.AG↗

arXiv2023

A Quantum $H^*(T)$-module via Quasimap Invariants

For $X$ a smooth projective variety, the quantum cohomology ring $QH^*(X)$ is a deformation of the usual cohomology ring $H^*(X)$, where the product structure is modified to incorporate quantum corrections. These correction terms are defined using Gromov-Witten invariants. When $X$ is toric with the geometric quotient description $V /\!/ T$, the cohomology ring $H^*(V /\!/T)$ also has the structure of a quantum $H^*(T)$-module. In this paper, we give a new deformation using quasimap invariants with a light point. This defines $H^*(T)$-module structure on $H^*(X)$ through a modified version of the WDVV equations. Using the Atiyah-Bott localization theorem, we explicitly compute this structure for the Hirzebruch surface of type 2. We conjecture that this new quantum module structure is isomorphic to the natural module structure of the Batyrev ring for a semipositive toric variety.

math.AG↗

arXiv1996

Nuclear Density-Dependent Effective Coupling Constants in the Mean-Field Theory

It is shown that the equation of state of nuclear matter can be determined within the mean-field theory of $σω$ model provided only that the nucleon effective mass curve is given. We use a family of the possible nucleon effective mass curves that reproduce the empirical saturation point in the calculation of the nuclear binding energy curves in order to obtain density-dependent effective coupling constants. The resulting density-dependent coupling constants may be used to study a possible equation of state of nuclear system at high density or neutron matter. Within the constraints used in this paper to $M^*$ of nuclear matter at saturation point and zero density, neutron matter of large incompressibility is strongly bound at high density while soft neutron matter is weakly bound at low density. The study also exhibits the importance of surface vibration modes in the study of nuclear equation of state.

nucl-th↗