Measurements depend on frames while invariants remain.
Frame dependence does not mean every description is equally arbitrary.
Side 118
Philosophy of Physics
Physics examined not only for what its equations predict, but for what its best theories imply about time, laws, probability, objects and reality.
theory→formalism→interpretation→evidence→ontology
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Relativity changes what can count as simultaneous, invariant and causal.
The geometry of space-time is both mathematical structure and a source of philosophical questions about temporal reality.
Distant simultaneity is not absolute in special relativity.
This complicates intuitive pictures of a universal present.
Gravity can be represented through space-time geometry.
The explanatory status of geometry raises questions about structure and substance.
Physics and lived temporal experience may diverge.
A theory of time must distinguish physical ordering from phenomenology.
Quantum formalism supports multiple interpretive pictures.
The empirical machinery is powerful while questions about measurement, probability and ontology remain contested.
The quantum state encodes predictive structure.
Interpretations disagree over whether it represents reality, knowledge or something else.
Definite outcomes require interpretation.
The formalism's treatment of measurement motivates competing accounts of collapse, branching and hidden variables.
Quantum probabilities are fundamental to prediction.
Their meaning differs across interpretations and cannot be read directly from frequency alone.
Bell-type results constrain local hidden-variable theories.
The result limits classes of explanations rather than licensing arbitrary faster-than-light signaling.
What kind of thing is a law of nature?
Equations summarize regularities, but philosophers disagree over whether laws govern, describe or emerge from deeper structure.
Laws can summarize stable patterns.
A purely descriptive view avoids mysterious governing entities but must explain why some regularities are lawlike.
Laws may encode physical necessity.
This view distinguishes laws from accidental generalizations but raises questions about the source of necessity.
Symmetries organize conservation and theory structure.
Symmetry principles can be explanatory without being simple causal mechanisms.
Different scales can support different lawful descriptions.
Higher-level laws can remain useful even when not fundamental.
Time-asymmetry emerges inside largely time-symmetric microphysics.
Entropy and irreversibility connect statistical description, boundary conditions and the arrow of time.
Macrostates can be compatible with many microstates.
Statistical entropy links coarse description to multiplicity rather than simple disorder.
Irreversible macroscopic patterns demand explanation.
Low-entropy boundary conditions play a central role in many accounts.
Thermodynamics relates to statistical mechanics without becoming trivial.
Inter-theory reduction depends on limits, idealization and explanatory goals.
Novel higher-level stability can coexist with microphysical dependence.
Emergence need not imply violation of lower-level physics.
Successful prediction does not eliminate interpretation. Physical theories constrain metaphysics, but moving from equations to claims about reality requires additional argument.