我们发现，二次 $f(T)$ 引力中的非极端带电旋转黑洞在全息意义上对偶于两种不同的隐藏共形场论。这两种共形场论可以合并，从而得到一种非常一般的隐藏共形场论，该理论由 $SL(2,\mathbb{Z})$ 模群生成。我们还对黑洞的极端极限进行了计算，并找到了相应的对偶量。与 Einstein 引力中极端带电旋转黑洞存在两种不同对偶共形场论的情况相反，我们发现二次 $f(T)$ 引力中的极端带电旋转黑洞只存在一种对偶理论。
英文摘要：
We find the non-extremal charged rotating black holes in quadratic $f(T)$ gravity are holographically dual to two different hidden conformal field theories. The two conformal field theories can be merged to find a very general hidden conformal field theory, which is generated by the $SL(2,\mathbb{Z})$ modular group. We also carry out the the calculation to the extremal limit of the black holes, and find the corresponding dual quantities. Contrary to the existence of two different dual conformal field theories for the extremal charged rotating black holes in Einstein gravity, we find only one dual theory exists for the extremal charged rotating black holes in quadratic $f(T)$ gravity.
We investigate several quantum phenomena related to quadratic gravity after rewriting the general fourth-order action in a more convenient form that is second-order in derivatives and produces only first-class constraints in phase space. We find that a Higgs mechanism may occur in the conformally invariant subset of the general quadratic action if the theory is conformally coupled to a scalar field that acquires a non-zero vacuum expectation value and spontaneously breaks the conformal symmetry. Then, in the broken phase, the originally massless spin-2 ghost may absorb both the scalar and vect…
We investigate the hidden conformal symmetry of the 4-dimensional non-extremal Kerr-Newman (KN) black hole with the idea of the near-region Kerr/CFT correspondence proposed by Castro, Maloney and Strominger in arXiv:1004.0996[hep-th]. The near-region KN black hole is dual to a 2D CFT with left and right temperatures $T_L=(2 M^2-Q^2)/(4πJ)$ and $T_R=\sqrt{M^4-J^2-M^2Q^2}/(2πJ)$. Furthermore, we reproduce the microscopic entropy of the KN black hole via the Cardy formula, which is in agreement with the macroscopic Bekenstein-Hawking entropy and precisely match the absorption cross section of a n…
We show that the Plebanski-Demianski spacetime persists as a solution of General Relativity when the theory is supplemented with both, a conformally coupled scalar theory and with quadratic curvature corrections. The quadratic terms are of two types and are given by quadratic combinations of the Riemann tensor as well as a higher curvature interaction constructed with a scalar field which is conformally coupled to quadratic terms in the curvature. The later is built in terms of a four-rank tensor $S_{μν}^{\ \ λρ}$ that depends on the Riemann tensor and the scalar field, and that transforms cov…
The Kerr/CFT correspondence provides a holographic description of spinning black holes that exist in our universe, and the notion of hidden conformal symmetry allows for a formulation of this correspondence away from extremality. In this work we study how hidden conformal symmetry is manifest when we consider dynamics beyond the Klein-Gordon equation, through studying the analytic structure of higher derivative equations of motion of a massless probe scalar field on a Kerr background using the monodromy method. Since such higher derivative dynamics appear in known examples of holographic AdS/l…
Motivated by advanced progress in the holographic theory between rotating black holes and CFT, we explore the conformal invariance on dyonic Kerr-Sen black hole and its gauged family. We consider a neutral massless scalar probe on the black holes' background within the low-frequency limit and exhibit that the solution space possesses $SL(2,R)\times SL(2,R)$ isometry. The periodic identification of the azimuthal angle corresponds to the spontaneous conformal symmetry breaking by temperatures $T_L,T_R$. Using the computation of the central charges on Ref. [25] that we recalculate by considering …
We argue that conformal invariance is a common thread linking several scalar effective field theories that appear in the double copy and scattering equations. For a derivatively coupled scalar with a quartic ${\cal O}(p^4)$ vertex, classical conformal invariance dictates an infinite tower of additional interactions that coincide exactly with Dirac-Born-Infeld theory analytically continued to spacetime dimension $D=0$. For the case of a quartic ${\cal O}(p^6)$ vertex, classical conformal invariance constrains the theory to be the special Galileon in $D=-2$ dimensions. We also verify the conform…
In this paper a hidden extra symmetry of conformally invariant Lagrangians occuring in physics is pointed out. This symmetry is most apparent in a metric independent, i.e. in a Palatini-like presentation of the variational problem. In such presentation, the usual conformal weight of fields can be encoded as local dilatation group gauge charges. The conventional conformal invariance of Lagrangians is then equivalent to dilatation gauge invariance. The claim of the paper is, that the most commonly occurring conformally invariant Lagrangians turning up in physics are not only invariant to local d…
We generalize the notion of hidden conformal symmetry in Kerr/CFT to Kerr-(A)dS black holes in arbitrary dimensions. We build the SL(2, R) generators directly from the Killing tower, whose Killing tensors and Killing vectors enforce the separability of the equations of motion. Our construction amounts to an explicit relationship between hidden conformal symmetries and Killing tensors: we use the Killing tower to build a novel tensor equation connecting the SL(2,R) Casimir with the radial Klein-Gordon operator. For asymptotically flat black holes in four and five dimensions we recover previousl…
Hidden global conformal symmetry without Virasoro extension in theory of elasticity
弹性理论（Theory of Elasticity）Riva-Cardy模型）被认为是尺度不变而非共形场论的一个例子。我们认为，在$d=2$尺寸，该理论隐藏了全球共形对称的$SL(2,\mathbb{R}) \times SL(2,\mathbb{R})$没有其Virasoro扩展。更精确地说，我们可以把位移矢量的所有关联函数嵌入到一个关于两个标量势变量的具有四阶导数作用的整体共形场论中，这必然违反反射正性。势变量的能量-动量张量不能改进为无迹的，因此即使存在全局特殊共形流，它也不表现出Virasoro对称性。
All Tree-Level Correlators in AdS${}_5\times$S${}_5$ Supergravity: Hidden Ten-Dimensional Conformal Symmetry
研究了强耦合超对称Yang-Mills理论中四个保护（半BPS）算子的关联函数.这些都是双重的树级超重力振幅上的AdS ${}_5\times$ S ${}_5$的各种球谐的五球。我们使用共形场论的方法，特别是最近获得的洛伦兹反演公式，分析这些自举。提取的$1/N^2$双迹反常维数证实了Aprile、Drummond、Heslop和Paul最近提出的一个简单模式。我们用一种出乎意料的十维共形对称来解释这种模式，这种对称似乎被树级超引力（或它的一个合适的子扇区）所享有。的对称性结合成一个单一的十维对象的所有球谐函数，并产生紧凑的表达式的任何半BPS相关器在每个循环顺序的领先的对数部分。
