The discussion revolves around the implications of spacelike intervals between events in the context of relativity. Participants explore whether such intervals prevent events from affecting each other and the observational capabilities of different observers regarding these events.
Participants do not reach a consensus, as there are competing views on the relationship between spacelike intervals, causality, and observability of events.
Some assumptions regarding the definitions of "observe" and the implications of light signal reception are not fully explored, leading to potential misunderstandings. The discussion also reflects varying levels of familiarity with advanced concepts like FRW spacetimes.
Yes.Ed Quanta said:So if the interval between two events is spacelike, does that mean that the two events cannot effect each other?
If you mean by observe the reception of light signals originating from such an event then some observers will be able to observe both events. Just be aware that the reception of light signals originated from an event, which is by itself an event, is not the same as the observed event.Ed Quanta said:Does that also mean that no observer can observe both events?
Consider for instance FRW spacetimes where some observers will forever be outside the future light cone of the event in question.matheinste said:Hello MeJennifer.
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---If you mean by observe the reception of light signals originating from such an event then some observers will be able to observe both events.-----
If only some observers can see both events doesn't this imply that there can be an event that some observers never see ? I note your caveat about the difference between the reception of light from an event and the event itself and assume it is relevant but the relevance is not understood by me.
Matheinste.