 Klein-Gordon equation in Einstein notation

ID: klein-gordon-equation-in-einstein-notation

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Klein-Gordon equation in Einstein notation by

Ciro Santilli 35  Updated 2025-03-25  +Created 1970-01-01

The Klein-Gordon equation can be written in terms of the d'Alembert operator as:

□ ψ + m^{2} ψ = 0

so we can expand the d'Alembert operator in Einstein notation to:

\partial_{i} \partial^{i} ψ - m^{2} ψ = 0

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