Physics Answers
Conceptual
- Why can’t the Schrödinger equation be derived?
- Is naturalness meaningful for non-fundamental theories?
- Why are muons considered to be elementary particles in the Standard Model?
- Was X17 predicted before it was observed?
- Is there any evidence that dark matter interacts with ordinary matter non-gravitationally?
- Does “reversing a quantum jump mid-flight” rule out any interpretations of QM?
Undergraduate
- Why does nature favor the Laplacian?
- Quantum made easy: so what is quantum mechanics all about?
- Why are the harmonics of a piano tone not multiples of the base frequency?
- Why not use this experiment to test gravity’s quantum properties?
- Why isn’t an infinite, flat, nonexpanding universe filled with a uniform matter distribution a solution to Einstein’s equation?
- Does Feynman’s derivation of Maxwell’s equations have a physical interpretation?
Graduate
- What is the analog of the Aharonov-Bohm effect for general gauge fields and for gravity?
- Is the effective Lagrangian the bare Lagrangian?
- Can electrons be electrically polarized?
- Why do we need complex representations in grand unified theories?
- If turning a perfectly monochromatic laser on for a finite time gives a frequency spread, where did the other frequency photons come from?
- What are the assumptions that C, P, and T must satisfy?