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A First Class Constraint Generates Not a Gauge Transformation,But a Bad Physical Change:The Case of Electromagnetism
empirical equivalence gauge freedom quantum gravity problem of time
2016/6/15
In Dirac-Bergmann constrained dynamics, a first-class constraint typically does not _alone_ generate a gauge transformation. By direct calculation it is found that each first-class constraint in Maxwe...
Circumveiloped by Obscuritads.The nature of interpretation in quantum mechanics,hermeneutic circles and physical reality,with cameos of James Joyce and Jacques Derrida
quantum mechanics interpretation reality hermeneutics realism
2016/6/14
The quest for finding the right interpretation of Quantum Mechanics (QM) is as old as QM and still has not ended, and may never end. The question what an interpretation of QM is has hardly ever been r...
Physical Determination of the Action
relativity foundations of dynamics measurement abstraction quantification energy momentum mass fundamental equation
2016/6/13
Physical theories ought to be built up from colloquial notions such as 'long bodies', 'energetic sources' etc. in terms of which one can define pre-theoretic ordering relations such as 'longer than', ...
A quantum physical argument for panpsychism
consciousness causal efficacy quantum superposition quantum-to-classical transition panpsychism
2016/6/13
It has been widely thought that consciousness has no causal efficacy in the physical world. However, this may be not the case. In this paper, we show that a conscious being can distinguish definite pe...
Similarity,Topology,and Physical Significance in Relativity Theory
similarity topology physical significance general relativity models contextualism
2016/6/13
Stephen Hawking, among others, has proposed that the topological stability of a property of spacetime is a necessary condition for it to be physically significant. What counts as stable, however, depe...
Physical Symmetries,Overarching Symmetries,and Consistency
Philosophy of Physics Philosophy of Science Metaphysics Symmetry
2016/5/31
In this paper I provide an account of physical symmetries, which are defined relative to a specific physical theory, and overarching symmetries, which hold across many different physical theories. I o...
“The most philosophically of all the sciences”:Karl Popper and physical cosmology
Karl Popper Hermann Bondi cosmology falsifiability demarcation steady state theory
2016/5/30
Problems of scientific cosmology only rarely occur in the works of Karl Popper. Nevertheless, it was a subject that interested him and which he occasionally commented on. What is more important, his g...
A πάρεργα und παραλειπŏμενα of J-M. Levy-Leblond ''On the Conceptual Nature of the Physical Constants''.
dimensional analysis conceptual change coordination class conceptual space physical constant epistemic relationships between mathematics and physics
2016/5/30
Starting, at first, from some little known but notable formal remarks made by the mathematician Gabriele Darbo about the qualitative dimensional analysis of the physical quantities, for then, above al...
Is There a Unique Physical Entropy?Micro versus Macro
entropy Gibbs paradox (in)distinguishability
2016/5/30
Entropy in thermodynamics is an extensive quantity, whereas standard methods in statistical mechanics give rise to a non-extensive expression for the entropy. This discrepancy is often seen as a sign ...
Primitive Ontology and the Structure of Fundamental Physical Theories
Quantum theories primitive ontology wave function ontology symmetry properties
2016/5/27
For a long time, it was believed that it was impossible to be realist about quantum mechanics. It took quite a while for the researchers in the foundations of physics, beginning with John Stuart Bell ...
Classical Mechanics Is Lagrangian; It Is Not Hamiltonian; The Semantics of Physical Theory Is Not Semantical
classical mechanics Lagrangian mechanics Hamiltonian mechanics
2009/11/18
One can (for the most part) formulate a model of a classical system
in either the Lagrangian or the Hamiltonian framework. Though it is
often thought that those two formulations are equivalent in al...
What are models that they may be used to represent reality? Here is a first pass. Models are objects that can be used to represent reality by exhibiting a designated similarity to physical objects. To...
Physical Pictures: Engineering Models circa 1914 and in Wittgenstein's Tractatus
model Wittgenstein dimensional analysis Buckingham
2008/3/31
In 1914, Wittgenstein recorded an incident in his Notebooks that he later mentioned to several friends as occasioning a major insight for his views in the Tractatus that propositions represent by bein...
Using Representations of Space to Study Early Modern Physical Science: An Example of Philosophy in the Service of History
representation of space conceptual framework historiography
2008/3/31
Most historians of science eagerly acknowledge that the early modern period witnessed a shift from a prevailing Aristotelian, spherical, centered conception of space to a prevailing Cartesian, rectili...
Using Representations of Space to Study Early Modern Physical Science: An Example of Philosophy in the Service of History
representation of space conceptual framework historiography
2011/9/8
Most historians of science eagerly acknowledge that the early modern period witnessed a shift from a prevailing Aristotelian, spherical, centered conception of space to a prevailing Cartesian, rectili...