Chiral phase transition and spin alignment of vector mesons with chiral imbalance in a rotating QCD medium
Year: 2025
Type: article
Abstract: We study the two-flavor Nambu-Jona-Lasinio model under the rotation and chiral chemical potential μ 5 . First, the influence of chiral imbalance on the chiral phase transition in the T p c − ω plane is investigated. Research manifests that, as μ 5 increases, the critical point of the T p c − ω plane chiral phase transition will move closer to the T axis. This means that the chiral chemical potential μ 5 can significantly affect the T p c − ω phase diagram and phase transition behavior. While discussing the T p c − ω phase diagram, we also study the spin alignment of the ρ vector meson under rotation. In the study of the spin alignment of the vector meson ρ , ρ 00 is the 00 element of the spin density matrix of vector mesons. At high temperatures, ρ 00 is close to 1 / 3 , which indicates that the spin alignment of the vector meson ρ is isotropic. The study found that, under finite rotation, increasing the chiral chemical potential μ 5 can significantly enhance ρ 00 around the phase transition temperature. When rotational angular velocity is zero, ρ 00 is close to 1 / 3 , but as ω increases, ρ 00 significantly decreases and deviates 1 / 3 , indicating that rotation can significantly cause polarization characteristics. The ρ 00 − r relationship near the phase transition temperature is studied. It is found that the farther away from the center of rotation, the lower the degree of spin polarization of the system. It is also found that the influence of chiral imbalance on the ρ 00 − r relationship is also significant.
Authors: Yang Hua, Sheng-Qin Feng
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4407239975