- d’Alembert Operator
- d’Alembert’s Principle
- Dark Energy
- Dark Matter
- Dark Sky Paradox
- Davisson-Germer Experiment
- De Broglie Wavelength
- De Sitter Universe
- Decay Chains
- Decibel (unit)
- Density Functional Theory (DFT)
- Dielectric Materials
- Diffraction
- Dirac Equation
- Dirac Matrices
- Dirac Sea
- Dirichlet Conditions
- Dispersion Relation
- Doppler Effect
- Dot Product
- Dyne (unit)
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