Card 6.11 · Root VI — The Philosophy of X Family
Philosophy of Physics
What is quantum theory telling us about the world?
Philosophy of physics examines what physical theories say about reality — particularly where the mathematics is agreed and its interpretation is not.
On this card
Where it sits
Under VI. Philosophy of X. Borders 1.4 Philosophy of time, 1.5 Philosophy of space, 6.8.2 Scientific realism, 1.9 Laws of nature.
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The interpretations
| Interpretation | Claim |
|---|---|
| Copenhagen | The formalism predicts measurements; asking what is happening between them is not a well-posed question |
| Many-worlds | The wavefunction never collapses; all outcomes occur in branching worlds |
| Pilot wave | Particles have definite positions guided by a real wave; determinism is preserved |
| Objective collapse | Collapse is a real physical process with its own dynamics |
| QBism | The wavefunction represents an agent's beliefs, not the world |
| Relational | States are relative to systems; there is no observer-independent state |
Where do you stand?
What is quantum theory telling us about the world?
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Key figures
| Figure | Dates | Tradition | Contribution |
|---|---|---|---|
| Niels Bohr | 1885–1962 | Danish | Complementarity; the Copenhagen view |
| Albert Einstein | 1879–1955 | German | Realist objections; the EPR argument |
| David Bohm | 1917–1992 | American | Pilot-wave theory |
| Hugh Everett III | 1930–1982 | American | Relative-state formulation |
| John Bell | 1928–1990 | Irish | The inequality that made the question experimental |
| Émilie du Châtelet | 1706–1749 | European modern | Developed a natural philosophy combining Newtonian physics with Leibnizian-Wolffian metaphysics, while defending vis viva and the principle of sufficient reason |
Talk about it here
Conversations about this question in Physics & cosmology:
- If the Big Bang marks the edge of a theory rather than a beginning, what is left of the kalām’s physics? 5 replies
- Is Wheeler’s “it from bit” a physics proposal or a piece of metaphysics? 5 replies
- Special relativity has refuted presentism, whatever presentists say 5 replies
- Many-worlds is the most conservative reading of quantum mechanics, not the wildest 5 replies
- What is the “no miracles” argument for believing electrons are real? 4 replies
Join free to ask about it Everything in Physics & cosmology
Connections
→ 6.8, 6.8.2 · ↔ 1.4, 1.5, 1.9, 1.4.2 · ◇ scientific realism, instrumentalism, determinism · ○ Modern; Table 1
→ depends on · ↔ borders: genuine overlap, neither prior · ◇ answered by: points from question to answers · ○ appears in: points to the timeline and the comparisons
The full card is in the book
In The Coordinates of Thought this card goes on to a worked example that sets the answers against one case, and to where the question touches daily life — page 293.