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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...
Recent Conceptual Consequences of Loop Quantum Gravity. Part I: Foundational Aspects.
Natural Philosophy Philosophy of Science Quantum Gravity
2008/4/22
Conceptual consequences of recent results in loop quantum gravity are collected and discussed here in view of their implications for a modern philosophy of science which is mainly understood as one th...
The domains of quantum theory and general relativity overlap in situations where quantum mechanical effects cannot be ignored. In order to deal with this overlap of theoretical domains, there has been...
In this paper I wish to make some headway on understanding what \emph{kind} of problem the ``problem of time'' is, and offer a possible resolution---or, rather, a new way of understanding an old resol...
To Quantize or Not to Quantize: Fact and Folklore in Quantum Gravity
quantum gravity quantization
2008/4/21
Does the need to find a quantum theory of gravity imply that the gravitational field must be quantized? Physicists working in quantum gravity routinely assume an affirmative answer, often without bein...
On his way to General Relativity (GR) Einstein gave several arguments as to why a special relativistic theory of gravity based on a massless scalar field could be ruled out merely on grounds of theore...
Naive Quantum Gravity
Gravity
2008/4/15
In this paper we consider a naive conception of what a quantum theory of gravity might entail: a quantum-mechanically fluctuating gravitational field at each spacetime point. We argue that this idea i...
This is an essay review of two textbooks on quantum gravity by Carlo Rovelli and Claus Kiefer.
Inertia Equals Gravity
centrifugal equivalence Higgs motion
2008/4/14
Despite the success of General Relativity in depicting gravity, inertia--an equivalent force--continues to defy explanation. Even its status as a force is open to question since its source has never b...
Gravity and Gauge Theory
Gauge Theory Gravity
2008/4/14
Gauge theories are theories that are invariant under a characteristic group of "gauge" transformations. General relativity is invariant under transformations of the diffeomorphism group. This has prom...
Gauge Gravity and the Unification of Natural Forces
the Unification of Natural Forces Gauge Gravity
2008/4/14
Physics seems to tell us that there are four fundamental force-fields in nature: the gravitational, the electromagnetic, the weak, and the strong force-field (or interactions). But it also seems to te...
Belot, Earman, and Ruetsche (1999) dismiss the black hole remnant proposal as an inadequate
response to the Hawking information loss paradox. I argue that their criticisms are misplaced
and that, pr...