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A proposal for a Bohmian ontology of quantum gravity
Bohmian mechanics loop quantum gravity emergence of space-time non-local law primitive ontology Wheeler-DeWitt equation
2016/6/15
The paper shows how the Bohmian approach to quantum physics can be applied to develop a clear and coherent ontology of non-perturbative quantum gravity. We suggest retaining discrete objects as the pr...
An Adynamical,Graphical Approach to Quantum Gravity and Unification
quantum gravity unification lattice gauge theory Regge calculus path integral graphs
2016/6/15
We propose an adynamical, background independent approach to quantum gravity and unification whereby the fundamental elements of Nature are graphical units of space, time and sources (in parlance of q...
Benefits of Objective Collapse Models for Cosmology and Quantum Gravity
Objective collapse Dynamical reduction Quantum gravity Cosmology
2016/6/15
We display a number of advantages of objective collapse theories for the resolution of long-standing problems in cosmology and quantum gravity. In particular, we examine applications of objective redu...
Disappearance and emergence of space and time in quantum gravity
quantum gravity foundations of spacetime theories emergent spacetime condensed matter cosmology
2016/6/15
We discuss the hints for the disappearance of continuum space and time at microscopic scale. These include arguments for a discrete nature of them or for a fundamental non-locality, in a quantum theor...
A dilemma for the emergence of spacetime in canonical quantum gravity
spacetime emergence quantum geometrodynamics loop quantum gravity quantum superposition quantum entanglement non-separability structural realism local beables
2016/5/30
The procedures of canonical quantization of the gravitational field apparently lead to entities for which any interpretation in terms of spatio-temporal localization or spatio-temporal extension seems...
Time in quantum gravity
quantum gravity problem of time quantum general relativity string theory noncommutative spacetime metaphysics of space metaphysics of time causation
2016/5/30
Quantum gravity--the marriage of quantum physics with general relativity--is bound to contain deep and important lessons for the nature of physical time. Some of these lessons shall be canvassed here,...
We outline three principles that should guide us in the construction of a theory of canonical quantum gravity: 1) diffeomorphism invariance, 2) implementing the proper dynamics and related constraint ...
General Covariance and Background Independence in Quantum Gravity
general covariance background independence quantum gravity string theory loop quantum gravity spin foam models
2016/5/27
The history of general relativity suggests that in absence of experi-mental data, constructing a theory on philosophical first principles can lead to a very useful theory as well as to ground-breaking...
I examine the early history of quantum gravity and comment on its suitability as an episode that demands an integrated approach to history and philosophy of science.
Quantum Gravity: Motivations and Alternatives
Quantum Gravity Covariant Quantization Canonical Quantization
2009/9/16
The mutual conceptual incompatibility between General Relativity and Quantum Mechanics / Quantum Field Theory is generally seen as the most essential motivation for the development of a theory of Quan...
Quantum Gravity: Has Spacetime Quantum Properties?
Quantum Gravity Quantum Spacetime Emergent Gravity Emergent Spacetime
2009/4/1
The conceptual incompatibility between General Relativity and Quantum Mechanics is generally seen as a sufficient motivation for the development of a theory of Quantum Gravity. If - so a typical argum...
On the Emergence of Time in Quantum Gravity
quantum gravity emergence quantum geometrodynamics
2008/4/22
We discuss from a philosophical perspective the way in
which the normal concept of time might be said to `emerge'
in a quantum theory of gravity. After an introduction, we
briefly discuss the notio...
There is a philosophical tradition of arguing against presentism, the thesis that only presently existing things exist, on the basis of its incompatibility with fundamental physics. I grant that prese...
Recent Conceptual Consequences of Loop Quantum Gravity. Part III: A Postscript On Time.
Natural Philosophy Philosophy of Science Quantum Gravity
2008/4/22
With a view to the results discussed in the first two parts of this paper, the concept of time is revisited oncemore and chosen as an example in order to demonstrate the meaning of fundamental in both...
Recent Conceptual Consequences of Loop Quantum Gravity. Part II: Holistic Aspects.
Natural Philosophy Philosophy of Science Quantum Gravity
2008/4/22
Based on the foundational aspects which have been discussed as consequences of ongoing research on loop quantum gravity in the first part of this paper, the holistic aspects of the latter are discusse...