标题： 轴对称扭力的pp波的物理解释 显示英文标题

标题： Physical interpretation of pp-waves with axial torsion

摘要： 我们考虑具有纯轴向挠率的广义pp波，我们之前表明它们是二次度规仿射引力的新真空解。 我们的分析表明，平行里奇曲率的经典pp波不应单独看待。 它们是更广泛的一类解的特殊表示，即平行里奇曲率的广义pp波。 我们将具有纯轴向挠率的pp波与爱因斯坦-外尔理论的解进行比较，该经典模型描述了引力和无质量中微子场的相互作用。 显示英文摘要

摘要： We consider generalised pp-waves with purely axial torsion, which we previously showed to be new vacuum solutions of quadratic metric-affine gravity. Our analysis shows that classical pp-waves of parallel Ricci curvature should not be viewed on their own. They are a particular representation of a wider class of solutions, namely generalised pp-waves of parallel Ricci curvature. We compare our pp-waves with purely axial torsion to solutions of Einstein-Weyl theory, the classical model describing the interaction of gravitational and massless neutrino fields.