- #1
Sourabh N
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Off pg 977 MTW Gravitation :
Consider a classical radiation field whose associated quantum mechanical particles have integer spin S, and zero rest mass. Resolve that radiation field into spherical harmonics - i.e. into multipole moments. all components with l<S will vanish; in general those with l>=S will remain; and this is independent of the nature of the source!
Can anyone reason me why l<S would vanish?
Consider a classical radiation field whose associated quantum mechanical particles have integer spin S, and zero rest mass. Resolve that radiation field into spherical harmonics - i.e. into multipole moments. all components with l<S will vanish; in general those with l>=S will remain; and this is independent of the nature of the source!
Can anyone reason me why l<S would vanish?