Within the framework of Dyson--Schwinger equations of QCD, we study the effect of finite volume on the chiral phase transition in a sphere with the MIT boundary condition. We find that the chiral quark condensate ⟨ψˉψ⟩ and pseudotransition temperature Tpc of the crossover decreases as the volume decreases, until there is no chiral crossover transition at last. We find that the system for R=∞\ fm is indistinguishable from R=10 fm and there is a significant decrease in Tpc with R as R<4 fm. When R<1.5 fm, there is no chiral transition in the system.
@article{arxiv.2009.12035,
title = {Chiral crossover transition from the Dyson-Schwinger equations in a sphere},
author = {Yin-Zhen Xu and Chao Shi and Xiao-Tao He and Hong-Shi Zong},
journal= {arXiv preprint arXiv:2009.12035},
year = {2021}
}