Results 41 to 50 of about 52,296 (249)
Phantom singularities and their quantum fate: general relativity and beyond—a CANTATA COST action topic [PDF]
General Relativity and Gravitation, 2019 Cosmological observations allow the possibility that dark energy is caused by phantom fields. These fields typically lead to the occurrence of singularities in the late Universe.
Mariam Bouhmadi-L'opez +2 more
semanticscholar +1 more source
L'emergenza dello spazio-tempo nella gravità quantistica e nella cosmologia quantistica
Philosophy Kitchen, 2019 Our best description of spacetime is provided by general relativity – yet, this theory is not thought to be fundamental. Instead, it is expected to be replaced by a theory of quantum gravity, which may not feature spacetime fundamentally.
Karen Crowther
doaj +1 more source
A Brief Introduction to Loop Quantum Cosmology [PDF]
, 2009 In recent years, Loop Quantum Gravity has emerged as a solid candidate for a nonperturbative quantum theory of General Relativity. It is a background independent theory based on a description of the gravitational field in terms of holonomies and fluxes ...
Marugan, Guillermo A. Mena
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Conformal Cyclic Cosmology, gravitational entropy and quantum information
General Relativity and Gravitation, 2023 We inspect the basic ideas underlying Roger Penrose’s Conformal Cyclic Cosmology from the perspective of modern quantum information. We show that the assumed loss of degrees of freedom in black holes is not compatible with the quantum notion of entropy ...
Michał Eckstein
semanticscholar +1 more source
On the propagation across the big bounce in an open quantum FLRW cosmology [PDF]
The European Physical Journal C, 2022 The propagation of a scalar field in an open FLRW bounce-type quantum spacetime is examined, which arises within the framework of the IKKT matrix theory.
E. Battista, H. Steinacker
semanticscholar +1 more source
Higher-dimensional view on quantum cosmology [PDF]
Physical Review D, 2021 We argue that the choice of boundary condition for the wave function in quantum cosmology depends on the UV completion of general relativity. We provide an explicit example using a braneworld scenario in which a de Sitter cosmology is induced on the ...
U. Danielsson +3 more
semanticscholar +1 more source
Black Hole Thermodynamics [PDF]
, 2014 The discovery in the early 1970s that black holes radiate as black bodies has radically affected our understanding of general relativity, and offered us some early hints about the nature of quantum gravity.
Carlip, S.
core +1 more source
Does a Theory of Everything Exist?
Философия и космология, 2021 Since Einstein’s failure to define a Grand Unified Theory, physicists have pursued a comprehensive theory explaining nature, a Theory of Everything. But because General Relativity, Quantum Field Theory, and Cosmology have little in common, defining one ...
James R Johnson
doaj +1 more source
Braneworlds and Quantum States of Relativistic Shells [PDF]
, 2007 We review some applications of relativistic shells that are relevant in the context of quantum gravity/quantum cosmology. Using a recently developed approach, the stationary states of this general relativistic system can be determined in the ...
Ansoldi, Stefano
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DeWitt boundary condition is consistent in Hořava-Lifshitz quantum gravity
Physics Letters B, 2022 In quantum cosmology the DeWitt boundary condition is a proposal to set the wave function of the universe to vanish at the classical big-bang singularity.
Hiroki Matsui +2 more
doaj +1 more source