Article
Physics, Particles & Fields
Zimo Sun
Summary: In this article, we algebraically construct higher spin quasinormal modes in D-dimensional de Sitter spacetime using the ambient space formalism, where the modes fall into two nonunitary lowest-weight representations of so(1, D). From the perspective of local quantum field theory, the lowest-weight quasinormal modes of massless higher spin fields are generated by gauge-invariant boundary conserved currents and boundary higher-spin Weyl tensors inserted at the southern pole of the past boundary. Additionally, it is demonstrated that the quasinormal spectrum of a massless/massive spin-s field is precisely encoded in the Harish-Chandra character corresponding to the unitary massless/massive spin-s SO(1, D) representation.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Anxo Biasi, Oleg Evnin, Spyros Sypsas
Summary: Cosmological acceleration is difficult to explain in theories involving supergravity and superstrings, but it is possible in theories with regular black holes. By placing this scenario in a global antide Sitter background, the formation of de Sitter bubbles can be enhanced, potentially leading to the creation of multiple accelerating universes. Numerical work in a two-dimensional dilaton-gravity model supports this idea.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Heng-Yu Chen, Yasuaki Hikida, Yusuke Taki, Takahiro Uetoko
Summary: In this study, we applied holography to determine the complex saddles of three-dimensional gravity with a positive cosmological constant. Considering a complexified metric is sometimes useful in studying quantum gravity, as demonstrated by Hartle and Hawking's no-boundary proposal. However, there are too many saddles for complexified gravity, necessitating the determination of which ones to consider. By describing the gravity theory using three-dimensional SL(2, C) Chern-Simons theory, we found that its holographic dual at the leading order is Liouville theory with a large imaginary central charge. We analyzed geometries with conical defects, such as the de Sitter black hole, using Liouville two-point function, and also studied geometries with two conical defects, where the saddles were determined by the monodromy matrix of Liouville four-point function. We extended this analysis to the case of higher-spin gravity using the Chern-Simons description.
Article
Astronomy & Astrophysics
Yasha Neiman
Summary: This article investigates the higher-spin gravity in (A)dS4 space, which is defined as the holographic dual of a free O(N) or Sp(N) vector model. The theory is considered non-local at distances greater than the (A)dS radius due to a mismatch in the massless exchange terms. However, the study shows that in the Euclidean OPE limit, there are no massless exchange-type non-localities for any spin, suggesting that the higher-spin theory is local in spacetimes with Euclidean boundary signature. This implies locality in de Sitter space for Lorentzian bulk.
Article
Physics, Particles & Fields
Alex Buchel
Summary: This paper investigates the perturbative stability of strongly coupled massive quantum field theories with a holographic dual in d+1 space-time dimensions. The derived spectrum of linearized fluctuations is used to characterize the late-time dynamics of holographic strongly coupled non-conformal gauge theories in de Sitter background.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
An Gong, Kun Liu, Fu-Wen Shu
Summary: A theorem on higher-order derivative theories of gravity is proven, showing that the de Sitter/anti-de Sitter metric is always a solution in any generally covariant theory of gravity. Using this theorem and a general form of entropy function for de Sitter spacetimes, the entropy of de Sitter spacetime in a generally covariant theory of gravity can be calculated without knowing the details of the modified metric. As an example, a general formula for dS entropy in Lovelock gravity is obtained.
Article
Physics, Particles & Fields
Jong-Hyun Baek, Kang-Sin Choi
Summary: In this study, we investigate the two-dimensional de Sitter universe evolving and proliferating through the Ginsparg-Perry-Bousso-Hawking mechanism, using Jackiw-Teitelboim gravity coupled to conformal matter. We find that quantum gravity effects generate black holes from pure de Sitter space, which then evaporate to produce multiple disjoint de Sitter spaces. We consider the back-reaction from matter CFT and calculate the finite temperature entropy of an inflating region using the island formula. Our results show that the island moves towards the apparent horizon of the black hole as the temperature increases. We also discuss the case of multiple evaporating black holes and propose the existence of multiple islands.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Scott Bassler, Jack Laiho, Marc Schiffer, Judah Unmuth-Yockey
Summary: By studying the emergence of de Sitter space in Euclidean dynamical triangulations (EDT), researchers were able to relate lattice parameters to the partition function of Euclidean quantum gravity. Through simulations, they extracted a value of the renormalized Newton's constant, consistent with previous determinations from scalar particle interactions. The presence of the same universal constant in different sectors of the theory suggests that EDT may offer a viable formulation of quantum gravity.
Article
Astronomy & Astrophysics
Hao Geng, Yasunori Nomura, Hao-Yu Sun
Summary: The study formulates a version of the information paradox in de Sitter spacetime, which is resolved by the emergence of entanglement islands as shown in the De Sitter/de Sitter correspondence, leading to a time-dependent Page curve for the entanglement entropy. It suggests that the distribution of microscopic degrees of freedom depends on descriptions, with differences between the static and global descriptions of de Sitter spacetime.
Article
Mathematics, Applied
Ivan Dimitrijevic, Branko Dragovich, Zoran Rakic, Jelena Stankovic
Summary: In this paper, the authors further investigate the nonlocal de Sitter model of gravity and find an appropriate solution for the Schwarzschild-de Sitter metric. They successfully solve the equations of motion in a certain approximation. The obtained approximate solution is of particular interest for examining the possible role of non-local de Sitter gravity in describing the effects in galactic dynamics that are usually attributed to dark matter.
Article
Physics, Particles & Fields
Adam Levine, Edgar Shaghoulian
Summary: Black holes and cosmology share common properties, leading to the question of whether our understanding of black holes can apply to cosmology. We discuss a paradox that arises if observers can access what lies beyond their cosmological horizon in the same way as they can access what lies beyond a black hole horizon, violating the no-cloning theorem of quantum mechanics. However, we argue that the paradox can be avoided in controlled examples through the use of the gravity path integral.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Tomi S. Koivisto, Luxi Zheng
Summary: This article presents a new de Sitter gauge theory of gravity that allows for the consistent evolution of the fundamental distance limit e, offering a novel nonsingular extension of cosmology.
Article
Physics, Multidisciplinary
Heng-Yu Chen, Yasuaki Hikida
Summary: We propose an explicitly calculable example of holography on three-dimensional de Sitter space by providing a prescription to analytic continue a higher-spin holography on three-dimensional anti-de Sitter space. Applying the de Sitter holography, we explicitly compute bulk correlation functions on three-dimensional de Sitter space at late time in a higher-spin gravity. These expressions are consistent with recent analysis based on bulk Feynman diagrams. Our explicit computations reveal how holographic computations could provide fruitful information.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Particles & Fields
Alejandra Castro, Francesca Mariani, Chiara Toldo
Summary: We analyze the thermodynamic response near extremality of charged black holes in four-dimensional Einstein-Maxwell theory with a positive cosmological constant. We provide a detailed analysis of the perturbations around the near-horizon geometry for each of the three extremal limits: cold, Nariai, and ultracold configurations. Our results uncover an interesting interplay between entropy variation and charge variation, particularly in the ultracold case.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Maciej Kolanowski, Jerzy Lewandowski
Summary: The paper generalizes the concept of 'conserved' charges given by Wald and Zoupas to asymptotically de Sitter spacetimes, which surprisingly results in a less ambiguous construction compared to asymptotically flat contexts. The physical meaning of these charges can be understood through an expansion around exact solutions with Killing vectors, with a focus on defining energy and angular momenta of gravitational waves on specific backgrounds. The obtained expressions have a correct limit as Lambda -> 0, and the paper also discusses the relationship between this approach and one based on the canonical phase space of initial data at I+.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Dionysios Anninos, Diego M. Hofman
CLASSICAL AND QUANTUM GRAVITY
(2018)
Article
Astronomy & Astrophysics
D. Anninos, V. De Luca, G. Franciolini, A. Kehagias, A. Riotto
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Physics, Particles & Fields
Dionysios Anninos, Damian A. Galante, Diego M. Hofman
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Dionysios Anninos, Frederik Denef, Ruben Monten, Zimo Sun
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Mechanics
Dionysios Anninos, Beatrix Muhlmann
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2020)
Article
Physics, Particles & Fields
Dionysios Anninos, Damian A. Galante
Summary: The study focuses on the thermodynamic properties of two-dimensional geometries flowing away from an asymptotically AdS(2) spacetime from both macroscopic and microscopic perspectives. A precise map for constructing fixed background metrics and computationally tractable RG flows in SYK-type models at different temperatures is presented. In certain parameter regimes, the flow geometry is argued to interpolate between two (near) AdS(2) spacetimes, suggesting a transition between different spacetime geometries.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dionysios Anninos, Beatrix Muehlmann
Summary: The conjectured duality between multicritical matrix integrals (MMI) and a series of non-unitary minimal models was explored, matching critical exponents and revealing novel combinatorial expressions. The finiteness of the continuum theory was elaborated with consideration of BRST cohomology and supported by matrix integrals.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dionysios Anninos, Teresa Bautista, Beatrix Muhlmann
Summary: We studied the Euclidean path integral of two-dimensional quantum gravity with positive cosmological constant coupled to conformal matter with large and positive central charge. Our analysis involved a semiclassical expansion around a round two-sphere saddle and working in the Weyl gauge, leading to a proposal for an all orders result for the two-dimensional gravitational partition function on the two-sphere, combined with insights from the DOZZ formula.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dionysios Anninos, Beatrix Muhlmann
Summary: This study focuses on the genus expansion of the gravitational path integral in two-dimensional spacetime with a positive cosmological constant, demonstrating an exponential growth of OPE coefficients and establishing a connection between matrix and gravity perspectives. The results provide a possible path towards a microscopic picture of a two-dimensional de Sitter universe.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dionysios Anninos, Frederik Denef, Y. T. Albert Law, Zimo Sun
Summary: Motivated by the prospect of constraining microscopic models, this study calculates the exact one-loop corrected de Sitter entropy for every effective field theory of quantum gravity. It establishes a universal relationship between the sphere partition function and the quotient of a quasi-canonical bulk and a Euclidean edge partition function. The study also reveals the exponential landscape of de Sitter vacua and the connection between dS, AdS(+/-), and conformal results in generic higher-spin gravity. Holography is exhibited in quasi-exact bulk-edge cancellation.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Dionysios Anninos, Eleanor Harris
Summary: The study examines the thermodynamic contributions to the three-dimensional de Sitter horizon from metric and Chern-Simons gauge field fluctuations. In the Euclidean signature, these are calculated by the gravity partition function coupled to matter semi-classically expanded about the round three-sphere saddle. The Lorentzian picture and the gravitational edge-mode theory at the de Sitter horizon are explored, drawing inspiration from topological entanglement entropy literature.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Dionysios Anninos, Diego M. Hofman, Stathis Vitouladitis
Summary: This study develops a one-dimensional (Conformal) Quantum Gravity model and establishes its effectiveness in computing the partition function of the Schwarzian theory. The non-localities in the model are related to the value of fixed gauge invariant moduli, and the properties of the model when all degrees of freedom fluctuate are also studied.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Dionysios Anninos, Damian A. Galante, Beatrix Muhlmann
Summary: We study the degrees of freedom for a quantum de Sitter spacetime from both a Lorentzian and a Euclidean perspective. From a Lorentzian perspective, we calculate the dynamical properties of the static patch de Sitter horizon and compare them to those of a black hole. From a Euclidean perspective, we consider the gravitational path integral for fields over compact manifolds. We propose that the localization of the Euclidean gravitational path integral reflects a finite number of degrees of freedom in a de Sitter Universe.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Physics, Particles & Fields
Dionysios Anninos, Eleanor Harris
Summary: This study investigates dilaton-gravity models that contain a significant portion of the static patch of dS(2) and examines their thermodynamic properties. The findings show that these geometries can exhibit local or even global thermodynamic stability within certain temperature ranges.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Dionysios Anninos, Diego M. Hofman, Jorrit Kruthoff
