Action
The Klein–Gordon equation can also be derived from the following action
where is the Klein–Gordon field and is its mass. The complex conjugate of is written If the scalar field is taken to be real-valued, then
From this we can derive the stress-energy tensor of the scalar field. It is
Read more about this topic: Klein–Gordon Equation
Famous quotes containing the word action:
“Any genuine philosophy leads to action and from action back again to wonder, to the enduring fact of mystery.”
—Henry Miller (1891–1980)
“The moment we choose to love we begin to move against domination, against oppression. The moment we choose to love we begin to move towards freedom, to act in ways that liberate ourselves and others. That action is the testimony of love as the practice of freedom.”
—bell hooks (b. c. 1955)