Thermal correlators in holographic CFTs on a sphere exhibit bulk-cone singularities at points connected by null geodesics in the bulk. The operator product expansion analysis of the stress-tensor sector of the correlator shows that there are analogous singularities at spacelike separation for thermal CFTs on a plane. We show that these are associated with complex null geodesics. There is a phase transition between the real and complex spacelike geodesics underpinning this picture. We also provide a phase-shift calculation of the position of these generalised bulk-cone singularities.
Bouncing geodesics, black hole singularities, and singularities of thermal correlators
Faculty of Mathematics and Physics, University of Ljubljana（卢布尔雅那大学数学与物理学院）；Higgs Centre for Theoretical Physics, University of Edinburgh（爱丁堡大学希格斯理论物理中心）
Geodesic geometry of 2+1-D Dirac materials subject to artificial, quenched gravitational singularities
Condensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland（马里兰大学凝聚态理论中心与联合量子研究所）；Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University（莱斯大学物理与天文学系及量子材料中心）
Complete classification of Friedmann-Lemaître-Robertson-Walker solutions with linear equation of state: parallelly propagated curvature singularities for general geodesics
Bouncing Geodesics, Singularities, and the Cavity Thermal Product Formula in Asymptotically Flat and de Sitter Black Holes
Faculty of Mathematics and Physics, University of Ljubljana（卢布尔雅那大学数学物理学院）；Higgs Centre for Theoretical Physics, University of Edinburgh（爱丁堡大学希格斯理论物理中心）
