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Raiders of the lost spacetime
quantum gravity problem of time quantum GR loop quantum gravity emergence of spacetime
2016/6/15
Spacetime as we know and love it is lost in most approaches to quantum gravity. For many of these approaches, as inchoate and incomplete as they may be, one of the main challenges is to relate what th...
The emergence of spacetime in quantum theories of gravity
spacetime quantum gravity emergence
2016/6/13
This is the introduction to the special issue of Studies in the History and Philosophy of Modern Physics on the emergence of spacetime in quantum theories of spacetime.
Homogeneity of spacetime implies the free Schrodinger equation
Schrö dinger equation spacetime homogeneity spacetime translation invariance Klein-Gordon equation
2016/6/13
The free Schrodinger equation is shown to be a consequence of spacetime homogeneity in the non-relativistic domain. This may help understand the origin of the wave equations in quantum theory.
Three possible implications of spacetime discreteness
spacetime discreteness Planck scale, speed of light gravity wavefunction collapse quantum gravity
2016/6/13
We analyze the possible implications of the discreteness of spacetime, which is defined here as the existence of a minimum observable interval of spacetime. First, it is argued that the discreteness o...
Inertial motion,explanation,and the foundations of classical spacetime theories
Inertial motion geodesic principle general relativity Newton-Cartan theory geometrized Newtonian gravitation explanation puzzle-ball view
2016/5/31
I begin by reviewing some recent work on the status of the geodesic principle in general relativity and the geometrized formulation of Newtonian gravitation. I then turn to the question of whether eit...
Was Leibniz the First Spacetime Structuralist?
Leibniz Clarke Leibniz-Clarke Correspondence Belot space spacetime structuralism relationism modal relationism substantivalism structural realism ontic structural realism
2016/5/31
I argue that the standard interpretation of Leibniz as a relationist about space is mistaken, and defend a reading according to which his correspondence with Samuel Clarke actually suggests that Leibn...
Spacetime and Reality:Facing the Ultimate Judge
Minkowski absolute world spacetime relativity of simultaneity length contraction
2016/5/31
Over a hundred years ago in his paper "Space and Time" Hermann Minkowski demonstrated the profound meaning of the relativity postulate - the experimental fact that physical phenomena are the same in a...
Substantivalist and Relationalist Approaches to Spacetime
substantivalism relationalism spacetime
2016/5/31
Substantivalists believe that spacetime and its parts are fundamental constituents of reality. Relationalists deny this, claiming that spacetime enjoys only a derivative existence. I begin by describi...
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...
Emergent spacetime and empirical (in) coherence
spacetime quantum gravity empirical incoherence causal set theory loop quantum gravity string theory non-commutative geometry
2016/5/30
Numerous approaches to a quantum theory of gravity posit fundamental ontologies that exclude spacetime, either partially or wholly. This situation raises deep questions about how such theories could r...
Similarity Assessments,Spacetime,and the Gravitational Field:What Does the Metric Tensor Represent in General Relativity?
general relativity metric tensor similarity-based reasoning
2016/5/30
In this paper I explore the dialectics underlying the choice between a geometrical and a field interpretation of the metric tensor gab in general relativity. My aim is to examine the role of a specifi...
Motivating Structural Realist Interpretations of Spacetime
structural realism spacetime category theory
2009/9/11
Motivated by examples from general relativity and Newtonian gravitation, this essay attempts to distinguish between the dynamical structure associated with a theory in physics, and its kinematical str...
Quantum Mechanics on Spacetime I: Spacetime State Realism
spacetime state realism wave-function realism quantum ontology non-separability narratability
2009/6/19
What ontology does realism about the quantum state suggest? The main extant view in contemporary philosophy of physics is wave-function realism. We elaborate the sense in which wave-function realism d...
What is a 'Physically Reasonable' Spacetime?
General Relativity Cosmology Underdetermination
2009/4/13
Cosmologists often use certain global properties to exclude "physically unreasonable" cosmological models from serious consideration. But, on what grounds should these properties be regarded as "physi...
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...