论文标题
外部重力场的核子和乳头的手性理论
Chiral theory of nucleons and pions in the presence of an external gravitational field
论文作者
论文摘要
我们通过考虑与外部重力场的耦合来扩展标准的二阶有效手性lagrangian。作为应用程序，我们将一环校正计算到手性计数中的能量孔张量的单核基质元素，并在外部重力场中的pion产生的临时树级树级振幅计算为第四阶。我们讨论获得的结果与实验可测量的可观察结果的关系。我们对核子重力形式因素的手性校正的表达与文献中的表达式不同。这可能需要重新审视过去获得的核子重力形式因子的晶格数据的手性外推。
We extend the standard second order effective chiral Lagrangian of pions and nucleons by considering the coupling to an external gravitational field. As an application we calculate one-loop corrections to the one-nucleon matrix element of the energy-momentum tensor to fourth order in chiral counting, and next-to-leading order tree-level amplitude of the pion-production in an external gravitational field. We discuss the relation of the obtained results to experimentally measurable observables. Our expressions for the chiral corrections to the nucleon gravitational form factors differ from those in the literature. That might require to revisit the chiral extrapolation of the lattice data on the nucleon gravitational form factors obtained in the past.
