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arXiv 2104.11238hep-thgr-qchep-ph
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CFT高阶导数耦合的Swampland条件

Swampland Conditions for Higher Derivative Couplings from CFT

Sandipan Kundu

摘要:

有些有效场论不能嵌入任何UV完备理论。我们考虑了$D$维大半径反德西特(AdS)时空中的标量有效场论,在有和没有动力学引力的情况下,通过只要求对偶CFT服从标准共形自举公理,得到了高阶导数相互作用$ϕ^2\Box^kϕ^2$的耦合常数的精确界(解析地).特别是,我们表明,所有这样的耦合常数,甚至$k\ge 2$,必须满足积极性,单调性和对数凸性条件下的动力学引力。包含重力仅影响涉及$ϕ^2\Box^2ϕ^2$相互作用的约束,该相互作用现在可以具有负的耦合常数。我们的CFT设置是一个洛伦兹四点相关器在雷吉限制。我们也利用这种设置来推导多标量的有效场论的约束。我们认为,类似的分析应施加非平凡的约束引力子四点散射振幅在AdS。

英文摘要:

There are effective field theories that cannot be embedded in any UV complete theory. We consider scalar effective field theories, with and without dynamical gravity, in $D$-dimensional anti-de Sitter (AdS) spacetime with large radius and derive precise bounds (analytically) on the coupling constants of higher derivative interactions $ϕ^2\Box^kϕ^2$ by only requiring that the dual CFT obeys the standard conformal bootstrap axioms. In particular, we show that all such coupling constants, for even $k\ge 2$, must satisfy positivity, monotonicity, and log-convexity conditions in the absence of dynamical gravity. Inclusion of gravity only affects constraints involving the $ϕ^2\Box^2ϕ^2$ interaction which now can have a negative coupling constant. Our CFT setup is a Lorentzian four-point correlator in the Regge limit. We also utilize this setup to derive constraints on effective field theories of multiple scalars. We argue that similar analysis should impose nontrivial constraints on the graviton four-point scattering amplitude in AdS.

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