Results 21 to 29 of about 20,249 (29)

Brane-World Gravity [PDF]

open access: yes, 2010
The observable universe could be a 1+3-surface (the "brane") embedded in a 1+3+\textit{d}-dimensional spacetime (the "bulk"), with Standard Model particles and fields trapped on the brane while gravity is free to access the bulk.
A Albrecht   +393 more
core   +4 more sources

Coherent states for FLRW space-times in loop quantum gravity

open access: yes, 2011
We construct a class of coherent spin-network states that capture proprieties of curved space-times of the Friedmann-Lama\^itre-Robertson-Walker type on which they are peaked.
Abhay Ashtekar   +7 more
core   +2 more sources

A Zero-Parameter Extension of General Relativity with Varying Cosmological Constant

open access: yes, 2019
We provide a new extension of general relativity (GR) which has the remarkable property of being more constrained than GR plus a cosmological constant, having one less free parameter.
Alexander, Stephon   +5 more
core   +1 more source

A candidate for a background independent formulation of M theory

open access: yes, 1999
A class of background independent membrane field theories are studied, and several properties are discovered which suggest that they may play a role in a background independent form of M theory.
A. Ashtekar   +108 more
core   +3 more sources

Quantum gravity in the very early universe

open access: yes, 2011
General relativity describes the gravitational field geometrically and in a self-interacting way because it couples to all forms of energy, including its own.
Ashtekar   +19 more
core   +1 more source

Reconstruction of mimetic gravity in a non-singular bouncing universe from quantum gravity

open access: yes, 2019
We illustrate a general reconstruction procedure for mimetic gravity. Focusing on a bouncing cosmological background, we derive general properties that must be satisfied by the function $f(\Box\phi)$ implementing the limiting curvature hypothesis.
de Cesare, Marco
core   +1 more source

Loop Quantum Gravity: Four Recent Advances and a Dozen Frequently Asked Questions

open access: yes, 2007
As per organizers' request, my talk at the 11th Marcel Grossmann Conference consisted of two parts. In the first, I illustrated recent advances in loop quantum gravity through examples.
Ashtekar, Abhay
core   +1 more source

The general scalar-tensor Hamiltonian with deformed covariance

open access: yes, 2018
We derive the scalar-tensor Hamiltonian constraint to all orders of momenta when the canonical constraint algebra is deformed by a phase space function as predicted by some studies into loop quantum cosmology.
Cuttell, Rhiannon, Sakellariadou, Mairi
core   +1 more source

Evolution of Primordial Black Holes in Loop Quantum Gravity

open access: yes, 2011
In this work, we study the evolution of Primordial Black Holes within the context of Loop Quantum Gravity. First we calculate the scale factor and energy density of the universe for different cosmic era and then taking these as inputs we study evolution ...
B. Nayak   +4 more
core   +1 more source

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