标题： 玻色子和杂化双场理论的非相对论极限 显示英文标题

标题： Non-Relativistic Limits of Bosonic and Heterotic Double Field Theory

摘要： 已知超引力普遍NS-NS部分的弦论非相对论（NR）极限由于来自度规和$B$-场的发散部分的非平凡抵消而具有有限的拉格朗日量。 我们证明在双重场理论（DFT）和广义几何中，这些抵消已经在广义度规的层面发生，该度规在极限$c \rightarrow \infty$下是收敛的。 在玻色子DFT的层面，这意味着可以在施加强约束和打破对偶性之前取NR极限。 在（有限）主导阶次上，这再现了DFT的非黎曼形式。 假设杂交DFT的广义度规是收敛的，我们推导出一种杂交超引力的新$c$-展开式，该展开式通过构造具有O$(D,D)$-不变性。 显示英文摘要

摘要： The known stringy non-relativistic (NR) limit of the universal NS-NS sector of supergravity has a finite Lagrangian due to non-trivial cancellations of divergent parts coming from the metric and the $B$-field. We demonstrate that in Double Field Theory (DFT) and generalised geometry these cancellations already happen at the level of the generalised metric, which is convergent in the limit $c \rightarrow \infty$. On the level of bosonic DFT this implies that the NR limit can be taken before imposing the strong constraint and breaking the duality symmetry. At the (finite) leading order this reproduces the Non-Riemannian formulation of DFT. Assuming a convergent generalised metric for heterotic DFT, we derive a novel $c$-expansion for heterotic supergravity which is, by construction, O$(D,D)$-invariant.