Results 61 to 70 of about 2,706,843 (321)
A Matrix Model for Flat Space Quantum Gravity
Journal of High Energy Physics, 2023 Abstract We take a step towards the non-perturbative description of a two-dimensional dilaton-gravity theory which has a vanishing cosmological constant and contains black holes. This is done in terms of a double-scaled Hermitian random matrix model which non-perturbatively computes the partition function for the asymptotic Bondi ...
Kar, Arjun +3 more
openaire +3 more sources
De Sitter microstates from T T ¯ $$ \overline{T} $$ + Λ2 and the Hawking-Page transition
Journal of High Energy Physics, 2022 We obtain microstates accounting for the Gibbons-Hawking entropy in dS 3, along with a subleading logarithmic correction, from the solvable T T ¯ $$ \overline{T} $$ + Λ2 deformation of a seed CFT with sparse light spectrum.
Evan Coleman +6 more
doaj +1 more source
Quantum singularities in a model of f(R) gravity [PDF]
The European Physical Journal C, 2012 The formation of a naked singularity in a model of f(R) gravity having as source a linear electromagnetic field is considered in view of quantum mechanics. Quantum test fields obeying the Klein-Gordon, Dirac and Maxwell equations are used to probe the classical timelike naked singularity developed at r=0.
Tahamtan, Tayabeh, Gürtuğ, Özay
openaire +6 more sources
Tree-level scattering amplitudes in nonlocal field theories
Journal of High Energy Physics, 2021 We prove in two ways that, for a special class of nonlocal field theories consistent with linear and non-linear stability at the classical level, and with unitarity and super-renormalizability or finiteness at the quantum level, the n-point tree-level ...
Leonardo Modesto, Gianluca Calcagni
doaj +1 more source
Lorentz Invariant Phenomenological Model of Quantum Gravity: A Minimalistic Presentation [PDF]
, 2012 The purpose of this paper is to give a minimalistic and self-contained presentation of a Lorentz Invariant phenomenological model of Quantum Gravity.
arxiv +1 more source
A finite quantum gravity field theory model [PDF]
Classical and Quantum Gravity, 2011 We discuss the quantization of Delta gravity, a two symmetric tensors model of gravity. This model, in Cosmology, shows accelerated expansion without a cosmological constant. We present the $\tilde $ transformation which defines the geometry of the model. Then we show that all delta type models live at one loop only.
Alfaro Solís, Jorge Luis +2 more
openaire +6 more sources
Direct Ink Writing of Conductive Hydrogels
Advanced Functional Materials, EarlyView.This review examines the use of direct ink writing (DIW) for fabricating conductive hydrogels with customizable 3D structures. It outlines the rheological requirements for successful DIW, followed by an exploration of the materials and ink formulations used to impart electronic and/or ionic conductivity to hydrogels while maintaining printability ...
Monica Ho +6 more
wiley +1 more source
Euclidean and Lorentzian Quantum Gravity - Lessons from Two Dimensions [PDF]
Chaos Solitons Fractals 10 (1999) 177-195, 1998 No theory of four-dimensional quantum gravity exists as yet. In this situation the two-dimensional theory, which can be analyzed by conventional field-theoretical methods, can serve as a toy model for studying some aspects of quantum gravity. It represents one of the rare settings in a quantum-gravitational context where one can calculate quantities ...
arxiv +1 more source
Synthetic Aspects and Characterization Needs in MOF Chemistry – from Discovery to Applications
Advanced Materials, EarlyView.Overcoming the challenges of phase discovery, synthesis optimization and scale‐up, characterization, and computational studies is essential to accelerate the large‐scale application of MOFs. Life‐cycle analyses and techno‐economic analyses need to be performed to realistically assess their potential for industrial relevance.
Bastian Achenbach +4 more
wiley +1 more source
Off-shell unimodular N = 1, d = 4 supergravity
Journal of High Energy Physics, 2020 We formulate a unimodular N = 1, d = 4 supergravity theory off shell. We see that the infinitesimal Grassmann parameters defining the unimodular supergravity trans- formations are constrained and show that the conmutator of two infinitesinal unimodular ...
Jesus Anero +2 more
doaj +1 more source