Higuchi 界的一个观察
A LooKK at the Higuchi Bound
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- Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)(马克斯·普朗克物理研究所)
- Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München(慕尼黑大学阿诺德·索末菲理论物理中心)
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中文总结 AI 辅助
本文提出一致紧致化的 KK 引力子从不违反 Higuchi 界,并在圆、翘曲区间和群流形等例子中检验,发现光滑形变造成的违反在模量极值化后消失。
中文摘要 AI 辅助
德西特时空中的有质量自旋 2 场必须满足 Higuchi 界,即 $m^2\geq 2H^2$。高维引力紧致化到 $\mathrm{dS}_4$ 会带来一个 Kaluza-Klein 引力子塔,其质量由内部几何决定,因此该界成为对紧致化的约束。我们提出,一致紧致化的 KK 引力子从不违反该界,并在几个例子中加以检验。在由 Casimir 能量稳定的圆上,除非圆收缩到低于物种尺度,否则该界成立;在具有负张力膜的有翘曲区间上,无论区间长度如何,该塔在 $m^2\geq \tfrac{9}{4}H^2$ 处出现能隙。对于群流形,我们认为,如果内部曲率不参数性地大于 Hubble 尺度,则该界似乎可被光滑形变违反。一旦将这些形变提升为模量,并在求解 10 维运动方程时立即将其极值化,这种违反就会消失。
英文摘要
Massive spin 2 fields on de Sitter must satisfy the Higuchi bound, $m^2\geq 2H^2$. Compactifications of higher dimensional gravity to $\mathrm{dS}_4$ come with a tower of Kaluza-Klein gravitons whose masses are fixed by the internal geometry, so the bound becomes a constraint on the compactification. We propose that the KK gravitons of a consistent compactification never violate it, and test this in a few examples. On a circle stabilized by Casimir energy the bound holds unless the circle shrinks below the species scale, and on a warped interval with negative tension branes the tower is gapped at $m^2\geq \tfrac{9}{4}H^2$ for any length of the interval. On group manifolds, we argue that if the internal curvature is not parametrically larger than the Hubble scale, the bound can apparently be violated by smooth deformations. The violation disappears once one promotes these deformations to moduli, which are immediately extremized when solving the 10d equations of motion.