MathematicalPhysicist
Oct16-04, 08:08 AM
this is from his website:
"In what class of 4-dimensional spacetimes does there exist a real, non-constant scalar field φ with the following properties:
It obeys the wave equation: ◻φ=0
Its gradient is everywhere null: ∇φ.∇φ=0"
somehow i think it is concerned with his work, but what is its siginificance?
"In what class of 4-dimensional spacetimes does there exist a real, non-constant scalar field φ with the following properties:
It obeys the wave equation: ◻φ=0
Its gradient is everywhere null: ∇φ.∇φ=0"
somehow i think it is concerned with his work, but what is its siginificance?