Article
Physics, Particles & Fields
Romina Ballesteros, Carmen Gomez-Fayren, Tomas Ortin, Matteo Zatti
Summary: In this study, the first law of black hole thermodynamics in 4-dimensional theories containing scalar and Abelian vector fields coupled to gravity is revisited. Wald's formalism and a new definition of scalar charge are used, which is an integral over a 2-surface satisfying a Gauss law in the background of stationary black-hole spacetimes. The focus is on ungauged supergravity-inspired theories with symmetric sigma models that generate electric-magnetic dualities leaving invariant their equations of motion. The resulting duality-invariant form of the first law is shown to be compatible with the previous results obtained by Gibbons, Kallosh, and Kol. Furthermore, a general expression for the scalar charges of a stationary black hole is obtained in terms of the other physical parameters of the solution and the position of the horizon, generalizing the expression obtained by Pacilio for dilaton black holes.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Tomas Codina, Olaf Hohm, Barton Zwiebach
Summary: This paper reports two surprising results on α' corrections in string theory restricted to massless fields. Firstly, for critical dimension Bianchi type I cosmologies, only q - 1 out of q scale factors have nontrivial α' corrections, and all α' corrections are trivial in Friedmann-Robertson-Walker backgrounds. Secondly, in noncritical dimensions, all terms in the spacetime action other than the cosmological term are field redefinition equivalent to terms with arbitrarily many derivatives, generally of the same order. Assuming a sufficiently fast falling α' expansion, field redefinitions consistent with this fall-off are considered and the higher-derivative terms for two-dimensional string theory with one timelike isometry are classified. This most general duality-invariant theory allows for black-hole solutions, and perturbative and nonperturbative tools to explore them are provided.
Article
Physics, Particles & Fields
Matteo Zatti
Summary: This study computes the first-order alpha' corrections to a family of 4-dimensional non-extremal black hole solutions with 4 charges and 3 independent charges in Heterotic Supergravity. The black hole thermodynamics, including Hawking temperature, Wald entropy, mass, gauge charges, and their thermodynamic potentials, are fully characterized. The study also verifies the relationships between these quantities and the first law of extended black hole mechanics and the Smarr formula.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Daniel Harlow, Edgar Shaghoulian
Summary: This paper argues for a close connection between the absence of global symmetries in quantum gravity and a unitary solution to the black hole information problem. By analyzing recent calculations on evaporating black holes and discussing low-dimensional quantum gravity theories, the argument against global symmetries is extended to more realistic theories.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Shahar Hadar, Alexandru Lupsasca, Achilleas P. Porfyriadis
Summary: We identified an invariant mu characterizing a backreaction in the study of spherically symmetric perturbations of the Bertotti-Robinson universe. The only allowed backreaction destroys the AdS(2)xS-2 boundary and builds the exterior of an asymptotically flat Reissner-Nordstrom black hole. Addition of linear anabasis perturbations to Bertotti-Robinson defines a connected AdS(2)xS(2) which accurately captures the dynamics of the asymptotically flat black hole.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Georgios K. Karananas, Alex Kehagias, John Taskas
Summary: A novel four-dimensional black hole model is proposed, with expected growth of entanglement entropy before Page's time, but later modified significantly by emergent islands, leading to saturation at a finite value. The study reveals that the entanglement entropy changes along the RG flow with respect to the two-dimensional worldsheet length scale.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Nabamita Banerjee, Muktajyoti Saha
Summary: Computing the 4D Euclidean path integral to one-loop order, we study the large quantum corrections that dominate the behavior of a spherically symmetric non-supersymmetric near-extremal black hole at very low temperature. These corrections arise from the near-horizon geometry of the near-extremal black hole and can be obtained using first-order perturbation theory and the zero modes of the extremal background. The resulting terms in the logarithm of the partition function correspond to logarithmic terms involving temperature, which match partly with the existing results derived from an effective Schwarzian theory in literature.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Iosif Bena, Daniel R. Mayerson
Summary: The article explains how to calculate the gravitational mass and angular momentum multipoles of the most general non-extremal four-dimensional black hole, as well as for generic supersymmetric four-dimensional microstate geometries and multi-center solutions. While many multipoles vanish for Kerr black holes and BPS black holes, embedding them in String Theory and deforming them slightly can yield an infinite set of ratios of vanishing multipoles that remain finite and independent of the direction of deformation.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Pablo A. Cano, Tomas Ortin, Alejandro Ruiperez, Matteo Zatti
Summary: In this study, we investigate the extremal black hole solutions of the Heterotic Superstring effective action at first order in alpha' with 3 and 4 charges of arbitrary signs. It is found that the choices of relative signs of these charges affect supersymmetry, and the alpha' corrections differ significantly depending on how supersymmetry is broken. Through providing fully analytic O(alpha') solutions, the charges, masses, and entropies are computed, and their invariance under alpha'-corrected T-duality transformations is checked.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
James Lucietti, Fred Tomlinson
Summary: We demonstrate that no five-dimensional black holes exist with lens space L(n, 1) topology and the simplest rod structure. The general solution we constructed on the axes and horizon will have a conical singularity on the inner axis component, as proven for two distinct singly spinning configurations and numerically evidenced for the generic doubly spinning solution.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jeongwon Ho, Wontae Kim, Bum-Hoon Lee
Summary: By investigating the quasinormal modes of a massive scalar field, we find that the 3-dimensional black string and the 3-dimensional rotating anti-de-Sitter black hole have similar properties for the strong cosmic censorship conjecture.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Yiming Chen, Juan Maldacena
Summary: By utilizing the large dimension expansion, we connect black holes to a well-studied two dimensional black hole, allowing exploration at string scale temperatures. It is argued that the black hole may surpass the Hagedorn temperature, but will likely transition to a highly excited string at slightly higher temperatures.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Nejc Ceplak, Roberto Emparan, Andrea Puhm, Marija Tomasevic
Summary: The translated article discusses the correspondence principle between strings and black holes, the puzzle that arises when including rotation, and proposes a solution by adding dynamical features and non-stationary configurations.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Di Wu, Shuang-Qing Wu
Summary: A novel class of ultra-spinning charged black hole solutions were constructed by using the ultra-spinning limit as a solution-generating trick from Chow's rotating charged black hole in six-dimensional N = 4 gauged supergravity theory. The thermodynamical properties were investigated and it was shown that the behavior can vary between sub-entropic and super-entropic depending on the parameters, which is different from other black holes.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Ibrahima Bah, Iosif Bena, Pierre Heidmann, Yixuan Li, Daniel R. Mayerson
Summary: We constructed a family of non-supersymmetric extremal black holes and their horizonless microstate geometries, which are astrophysically relevant and provide interesting prototypes for deviations from Kerr solutions. The gravitational multipole structure of these solutions differ significantly from Kerr, depending non-trivially on the charge-to-mass ratio. The horizonless microstate geometries have a similar multipole structure as their corresponding black hole, with deviations set by the scale of their microstructure.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Masayuki Fukuda, Nozomu Kobayashi, Tatsuma Nishioka
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Multidisciplinary
Tatsuma Nishioka
REVIEWS OF MODERN PHYSICS
(2018)
Article
Physics, Particles & Fields
Nozomu Kobayashi, Tatsuma Nishioka
JOURNAL OF HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Nozomu Kobayashi, Tatsuma Nishioka, Yoshiki Sato, Kento Watanabe
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Heng-Yu Chen, Lung-Chuan Chen, Nozomu Kobayashi, Tatsuma Nishioka
JOURNAL OF HIGH ENERGY PHYSICS
(2020)
Article
Physics, Particles & Fields
Kohki Kawabata, Tatsuma Nishioka, Yoshitaka Okuyama, Kento Watanabe
Summary: The study shows that in models related with gravitational phase transitions, entanglement capacity exhibits phase transitions between different types of topology and can serve as a valuable diagnostic tool in the process of black hole evaporation.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Tatsuma Nishioka, Yoshiki Sato
Summary: The study describes conformal defects of p dimensions in a free scalar theory as boundary conditions on the conformally flat space H(p+1)x?(d-p-1), classifying them into Dirichlet type and Neumann type. It is found that Dirichlet boundary conditions always exist, while Neumann boundary conditions are only allowed for defects of lower codimensions. The results are consistent with a recent classification of non-monodromy defects, highlighting the association of Neumann boundary conditions with non-trivial defects.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Tatsuma Nishioka, Tadashi Takayanagi, Yusuke Taki
Summary: The paper introduces the concept of topological pseudo entropy and examines its applications in Chern-Simons gauge theory. It demonstrates the equivalence between topological pseudo entropy and interface entropy, and also finds that the topological interface entropy for rational CFTs has a contribution identical to the topological entanglement entropy on a torus.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Kohki Kawabata, Tatsuma Nishioka, Yoshitaka Okuyama, Kento Watanabe
Summary: The entanglement capacity is considered as a probe of Hawking radiation in a two-dimensional dilaton gravity system coupled with large degrees of freedom conformal matter. A formula for calculating the capacity is derived using the gravitational path integral, suggesting a discontinuity at the Page time. Application of the formula to a replica wormhole solution in an eternal AdS black hole coupled to a non-gravitating bath revealed saturation of the entanglement capacity by the thermal capacity of the black hole in the high temperature limit.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Yasuaki Hikida, Tatsuma Nishioka, Tadashi Takayanagi, Yusuke Taki
Summary: We present a class of dS/CFT correspondence between two-dimensional CFTs and three-dimensional de Sitter spaces. We argue that this correspondence includes various gravity limits and dualities associated with SU(2) and SU(N) WZW models. We confirm the correctness of this correspondence and study two-point functions and entanglement entropy. We also discuss the possible spectrum and quantum corrections in the gravity theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Yasuaki Hikida, Tatsuma Nishioka, Tadashi Takayanagi, Yusuke Taki
Summary: This letter proposes a holographic duality for classical gravity on a three-dimensional de Sitter space and presents evidence in terms of classical partition function and conformal field theory.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Tatsuma Nishioka, Yoshitaka Okuyama, Soichiro Shimamori
Summary: Using the axiomatic framework of Rychkov and Tan, this study examines the critical O(N) vector model with a line defect in (4 - epsilon) dimensions. It is found that the critical value of the defect coupling to the bulk field can be uniquely determined without resorting to diagrammatic calculations, assuming the fixed point is described by defect conformal field theory. Various defect localized operators are also studied using the axiomatic method, where the analyticity of correlation functions is crucial in determining the conformal dimensions of defect composite operators. The leading anomalous dimensions obtained by perturbative calculations are reproduced in all cases, including operators with operator mixing.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Editorial Material
Physics, Particles & Fields
Tatsuma Nishioka, Yoshitaka Okuyama, Soichiro Shimamori
Summary: The O(N) vector model in the presence of a boundary exhibits critical behaviors described by boundary conformal field theory in (4 - epsilon) dimensions. We investigate the spectrum of boundary operators using diagrammatic and axiomatic approaches at the leading order in the epsilon-expansion. In both approaches, consistent results are obtained, emphasizing the analyticity of correlation functions for the conformal dimensions of boundary composite operators.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Tatsuma Nishioka, Yoshitaka Okuyama, Soichiro Shimamori
Summary: We propose a method to describe correlation functions in higher-dimensional defect conformal field theories by using correlation functions in ancillary conformal field theories. This method has the potential to reveal new aspects of defect conformal field theories from the viewpoint of conventional conformal field theories.
Article
Physics, Particles & Fields
Nozomu Kobayashi, Tatsuma Nishioka, Yoshitaka Okuyama
JOURNAL OF HIGH ENERGY PHYSICS
(2020)