Arnold Sommerfeld was a German theoretical physicist whom the following is named after: * Drude–Sommerfeld model * Gamow–Sommerfeld factor, see Gamow factor * Grimm–Sommerfeld rule * Orr–Sommerfeld equation * Sommerfeld–Bohr theory * Sommerfeld–Kossel displacement law * Sommerfeld–Wilson quantization, Sommerfeld-Wilson-Ishiwara quantization * Sommerfeld coefficient * Sommerfeld constant, see fine structure constant * Sommerfeld crater * Sommerfeld expansion * Sommerfeld effect * Sommerfeld's approximation * Sommerfeld identity * Sommerfeld number * Sommerfeld parameter * Sommerfeld radiation condition * Sommerfeld-Zenneck surface wave