32 Result(s)
within
Dionysios Anninos
Classical and Quantum Gravitation, Relativity Theory
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Open AccessErratum to: Higher spin de Sitter Hilbert space
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Open AccessGravitational observatories
We consider four-dimensional general relativity with vanishing cosmological constant defined on a manifold with a boundary. In Lorentzian signature, the timelike boundary is of the form σ × ℝ, with σ a spatial tw...
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Open AccessRenormalisation group flows of deformed SYK models
We explore computationally tractable deformations of the SYK model. The deformed theories are described by the sum of two SYK Hamiltonians with differing numbers, q and
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Open AccessdS2 supergravity
We construct two-dimensional supergravity theories endowed with a positive cosmological constant, that admit de Sitter vacua. We consider the cases of ...
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Open AccessInterpolating geometries and the stretched dS2 horizon
We investigate dilaton-gravity models whose solutions contain a large portion of the static patch of dS2. The thermodynamic properties of these theories are considered both in the presence of a finite Dirichlet w...
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Open AccessOne-dimensional Quantum Gravity and the Schwarzian theory
We develop a model of one-dimensional (Conformal) Quantum Gravity. By discussing the connection between Goldstone and gauge theories, we establish that this model effectively computes the partition function of...
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Open AccessQuantum de Sitter horizon entropy from quasicanonical bulk, edge, sphere and topological string partition functions
Motivated by the prospect of constraining microscopic models, we calculate the exact one-loop corrected de Sitter entropy (the logarithm of the sphere partition function) for every effective field theory of qu...
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Open AccessThe semiclassical gravitational path integral and random matrices (toward a microscopic picture of a dS2 universe)
We study the genus expansion on compact Riemann surfaces of the gravitational path integral Z ...
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Open AccessThree-dimensional de Sitter horizon thermodynamics
We explore thermodynamic contributions to the three-dimensional de Sitter horizon originating from metric and Chern-Simons gauge field fluctuations. In Euclidean signature these are computed by the partition f...
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Open AccessThe two-sphere partition function in two-dimensional quantum gravity
We study the Euclidean path integral of two-dimensional quantum gravity with positive cosmological constant coupled to conformal matter with large and positive central charge. The problem is considered in a se...
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Open AccessMatrix integrals & finite holography
We explore the conjectured duality between a class of large N matrix integrals, known as multicritical matrix integrals (MMI), and the series (2m − 1, 2) of non-unitary minimal models on a fluctuating background....
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Open AccessConstructing AdS2 flow geometries
We consider two-dimensional geometries flowing away from an asymptotically AdS2 spacetime. Macroscopically, flow geometries and their thermodynamic properties are studied from the perspective of dilaton-gravity m...
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Open AccessHigher spin de Sitter Hilbert space
We propose a complete microscopic definition of the Hilbert space of minimal higher spin de Sitter quantum gravity and its Hartle-Hawking vacuum state. The funda- mental degrees of freedom are 2N bosonic fields l...
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Open AccessDe Sitter horizons & holographic liquids
We explore asymptotically AdS2 solutions of a particular two-dimensional dilaton-gravity theory. In the deep interior, these solutions flow to the cosmological horizon of dS2. We calculate various matter perturba...
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Open AccessMarginal deformations & rotating horizons
Motivated by the near-horizon geometry of four-dimensional extremal black holes, we study a disordered quantum mechanical system invariant under a global SU(2) symmetry. As in the Sachdev-Ye-Kitaev model, this...
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Open AccessDisordered quivers and cold horizons
We analyze the low temperature structure of a supersymmetric quiver quantum mechanics with randomized superpotential coefficients, treating them as quenched disorder. These theories describe features of the lo...
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Open AccessCosmic clustering
We show that the late time Hartle-Hawking wave function for a free massless scalar in a fixed de Sitter background encodes a sharp ultrametric structure for the standard Euclidean distance on the space of fiel...
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Open AccessGrassmann matrix quantum mechanics
We explore quantum mechanical theories whose fundamental degrees of freedom are rectangular matrices with Grassmann valued matrix elements. We study particular models where the low energy sector can be describ...
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Open AccessHolographic vitrification
We establish the existence of stable and metastable stationary black hole bound states at finite temperature and chemical potentials in global and planar four-dimensional asymptotically anti-de Sitter space. W...
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Open AccessConformal quivers and melting molecules
Quiver quantum mechanics describes the low energy dynamics of a system of wrapped D-branes. It captures several aspects of single and multicentered BPS black hole geometries in four-dimensional ...
