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arXiv 2103.03267hep-thmath-phmath.MP
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例外广义几何中的流、荷与代数

Currents, charges and algebras in exceptional generalised geometry

David Osten

摘要:

提出了IIb型和十一维超引力中半BPS p膜世界体积理论的经典$E_{d(d)}$不变Hamilton公式,将已知结果扩展到$d \leq 6$。它包括一个哈密顿量,其特征在于由一个广义度量,和一个当前的代数构造s.t.它再现了$E_{d(d)}$广义李导数。$E_{d(d)}$ -协方差需要引入所谓的电荷,指定p膜的类型和截面的选择。当p>2时,p-膜的流一般是非几何的,这是由于U-对偶的存在,例如M5-流包含与M2-动量相关的坐标。从规范泊松结构导出$E_{d(d)}$不变电流代数一般是不可能的。最多可以导出一个与仿厄米特例外几何相关的当前代数。对SL(5)理论中的膜进行了详细的研究。它表明,在一个广义框架的电流代数是扭曲的广义通量。作为一致性检验,从M理论中的膜到IIa型弦论中的弦进行了双维约化。许多特征可以推广到SL(p+3)广义几何中的p-膜,这些几何构成了$E_{d(d)}$不变流的基石。

英文摘要:

A classical $E_{d(d)}$-invariant Hamiltonian formulation of world-volume theories of half-BPS p-branes in type IIb and eleven-dimensional supergravity is proposed, extending known results to $d \leq 6$. It consists of a Hamiltonian, characterised by a generalised metric, and a current algebra constructed s.t. it reproduces the $E_{d(d)}$ generalised Lie derivative. $E_{d(d)}$-covariance necessitates the introduction of so-called charges, specifying the type of p-brane and the choice of section. For p>2, currents of p-branes are generically non-geometric due to the imposition of U-duality, e.g. the M5-currents contain coordinates associated to the M2-momentum. A derivation of the $E_{d(d)}$-invariant current algebra from a canonical Poisson structure is in general not possible. At most, one can derive a current algebra associated to para-Hermitian exceptional geometry. The membrane in the SL(5)-theory is studied in detail. It is shown that in a generalised frame the current algebra is twisted by the generalised fluxes. As a consistency check, the double dimensional reduction from membranes in M-theory to strings in type IIa string theory is performed. Many features generalise to p-branes in SL(p+3) generalised geometries that form building blocks for the $E_{d(d)}$-invariant currents.

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