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Time and Fermions:General Covariance vs.Ockham's Razor for Spinors
spinor fermion general covariance geometric object nonlinear group realization conventionality of simultaneity Schwarzschild solution
2016/6/15
It is a commonplace in the foundations of physics, attributed to Kretschmann, that any local physical theory can be represented using arbitrary coordinates, simply by using tensor calculus. On the oth...
Operational understanding of the covariance of classical electrodynamics
Operationalism Covariance of Classical Electrodynamics Empirical Verification Transformation Rule Maxwell–Lorentz Equations
2016/6/13
It is common in the literature on classical electrodynamics and relativity theory that the transformation rules for the basic electrodynamic quantities are derived from the pre-assumption that the equ...
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...
In classical mechanics, the Galilean covariance and the principle of relativity are completely equivalent and hold for all possible dynamical processes. In relativistic physics, on the contrary, the s...
Indiscernibles, General Covariance, and Other Symmetries
Leibniz identity of indiscernibles general covariance
2008/4/14
Leibniz's principle of identity of indiscernibles, formulated in modern logical terms, can be applied in a uniform way to all the exact physical symmetries, including the diffeomorphism group of gener...
General Covariance, Gauge Theories and the Kretschmann Objection.
the Kretschmann Objection Gauge Theories General Covariance
2008/4/14
How can we reconcile two claims that are now both widely accepted: Kretschmann's claim that a requirement of general covariance is physically vacuous and the standard view that the general covariance ...
General covariance from the perspective of Noether's theorems
general covariance Noether's theorems
2008/4/14
Analysis of Emmy Noether’s 1918 theorems provides an illuminating method for testing the consequences of “coordinate generality”, and for exploring what else must be added to this requirement in order...
General Covariance and the Objectivity of Space-Time Point-Events
Hole Argument Space-time Objectivity Physical Individuation
2008/4/14
"The last remnant of physical objectivity of space-time"is disclosed, beyond the Leibniz equivalence, in the case of a continuous family of spatially non-compact models of general relativity. The "phy...
Another look at general covariance and the equivalence of reference frames
General covariance equivalence relativity
2008/4/10
In his general theory of relativity (GR) Einstein sought togeneralize the special-relativistic equivalence of inertial frames to a principle according to which all frames of reference are equivalent. ...
Absolute Objects, Counterexamples and General Covariance
absolute object general covariance
2008/4/9
The Anderson-Friedman absolute objects program has been a favorite analysis of the substantive general covariance that supposedly characterizes Einstein's General Theory of Relativity (GTR). Absolute ...