Photon sphere and quasinormal modes in AdS/CFT

Hashimoto, Koji; Sugiura, Kakeru; Sugiyama, Katsuyuki; Yoda, Takuya

doi:10.1007/jhep10(2023)149

Cited by 3 publications

(2 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Motivated by this connection, one could try to extend some other known results on geodesic instabilities to the orbits of extended objects like strings. Of primary interest is the instability on the photon sphere which, apart from the well-known connection with quasinormal modes, holds the key to several other properties both in asymptotically flat and in global AdS spaces [90,91]. However, our setup needs to be substantially modified to study the photon sphere, which arises as the locus of unstable saddle points for null geodesics arriving from infinity.…”

Section: Jhep04(2024)025mentioning

confidence: 99%

Correlation functions for open strings and chaos

Ðukić,

Čubrović

2024

J. High Energ. Phys.

View full text Add to dashboard Cite

We study the holographic interpretation of the bulk instability, i.e. the bulk Lyapunov exponent in the motion of open classical bosonic strings in AdS black hole/brane/string backgrounds. In the vicinity of homogeneous and isotropic horizons the bulk Lyapunov exponent saturates the MSS chaos bound but in fact has nothing to do with chaos as our string configurations live in an integrable sector. In the D1-D5-p black string background, the bulk Lyapunov exponent is deformed away from the MSS value both by the rotation (the infrared deformation) and the existence of an asymptotically flat region (the ultraviolet deformation). The dynamics is still integrable and has nothing to do with chaos (either in gravity or in field theory). Instead, the bulk Lyapunov scale captures the imaginary part of quasinormal mode frequencies. Therefore, the meaning of the bulk chaos is that it determines the thermal decay rate due to the coupling to the heat bath, i.e. the horizon.

show abstract

Section: Jhep04(2024)025mentioning

confidence: 99%

Correlation functions for open strings and chaos

Ðukić,

Čubrović

2024

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…Recently, by utilizing the sl(2, R) ISO , the QNMs for scalar, vector, and spinor fields were obtained for the self-dual warped three-dimensional AdS black hole [8]. In line with the aforementioned studies, [9,10] discovered a peculiar form of the scalar QNM spectra near the photon sphere of a Schwarzschild black hole in an asymptotically…”

Section: Introductionmentioning

confidence: 96%

Notes on emergent conformal symmetry for black holes

Xue,

Jiang,

Zhang

2024

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

We examine the motion of the massless scalar field and nearly bound null geodesics in the near-ring region of a black hole, which may possess either acceleration or a gravitomagnetic mass. Around such black holes, the photon ring deviates from the equatorial plane. In the large angular momentum limit, we demonstrate that the massless scalar field exhibits an emergent conformal symmetry in this near-ring region. Additionally, in the nearly bound limit, we observe the emergence of a conformal symmetry for the null geodesics that constitute the photon ring in the black hole image. These findings suggest that the hidden conformal symmetry, associated with the Lie algebra 𝔰𝔩(2, ℝ), persists even for black holes lacking north-south reflection symmetry, thereby broadening the foundation of photon ring holography. Finally, we show that the conformal symmetry also emerges for nearly bound timelike geodesics and scalar fields in proximity to the particle ring, and with specific mass around a Schwarzschild black hole.

show abstract

Black hole bulk-cone singularities

Dodelson,

Iossa,

Karlsson

et al. 2024

J. High Energ. Phys.

View full text Add to dashboard Cite

Lorentzian correlators of local operators exhibit surprising singularities in theories with gravity duals. These are associated with null geodesics in an emergent bulk geometry. We analyze singularities of the thermal response function dual to propagation of waves on the AdS Schwarzschild black hole background. We derive the analytic form of the leading singularity dual to a bulk geodesic that winds around the black hole. Remarkably, it exhibits a boundary group velocity larger than the speed of light, whose dual is the angular velocity of null geodesics at the photon sphere. The strength of the singularity is controlled by the classical Lyapunov exponent associated with the instability of nearly bound photon orbits. In this sense, the bulk-cone singularity can be identified as the universal feature that encodes the ubiquitous black hole photon sphere in a dual holographic CFT. To perform the computation analytically, we express the two-point correlator as an infinite sum over Regge poles, and then evaluate this sum using WKB methods. We also compute the smeared correlator numerically, which in particular allows us to check and support our analytic predictions. We comment on the resolution of black hole bulk-cone singularities by stringy and gravitational effects into black hole bulk-cone “bumps”. We conclude that these bumps are robust, and could serve as a target for simulations of black hole-like geometries in table-top experiments.

show abstract

Photon sphere and quasinormal modes in AdS/CFT

Cited by 3 publications

References 53 publications

Correlation functions for open strings and chaos

Correlation functions for open strings and chaos

Notes on emergent conformal symmetry for black holes

Black hole bulk-cone singularities

Contact Info

Product

Resources

About