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daniel_i_l

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daniel_i_l

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Gravity waves are just ripples in space-time. However, they carry energy and momentum. As is the case for light, E^2 - p^2 = 0 (in geometric units), so a single gravity wave is massless. As is also the case for the light, if you have a pair of gravity waves travelling in opposite directions, the total momentum p is zero, but the total energy E is greater than zero, which means that the system comprising the pair of gravity waves has mass.

In GR gravity couples to energy (more precisely, the stress-energy tensor) rather than mass, anyway. The idea that gravity couples to mass is basically a carryover from Newtonian gravity.

In GR gravity couples to energy (more precisely, the stress-energy tensor) rather than mass, anyway. The idea that gravity couples to mass is basically a carryover from Newtonian gravity.

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