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Is the expansion of space and time necessarily at the same rate?
Space and time are related through gravity and it is sure that gravity caused a decceleration of time as more mass was formed in the early universe. Are these rates necessarily uniform? And as more mass is converted to energy will this locally affect the change in rate of time and space (less mass = less gravity)?
2 Answers
- Anonymous1 decade agoFavorite Answer
No, the expansion of space over time has not been uniform...
- Dr. RLv 71 decade ago
Look, words mean things. They are not as plastic as you seem to think. You are very confused about the meaning of certain words in particular.
Expansion rate is defined as the time rate of change of a volume. Volume is not a property of time, so the concept of time expanding is meaningless. Deceleration, meanwhile, means that the time rate of change of velocity is negative. Velocity is not a property of time, so the concept of time decelerating is meaningless. One could, if one wishes, generalize the definition of deceleration to mean the time derivative of *any* property decreases with time. In that case, time cannot decelerate since its time derivative is constant at exactly one second per second.