From: *Brent Meeker* <[email protected] <mailto:[email protected]>>
On 10/15/2018 11:21 AM, smitra wrote: > This all suggests to me that we live in a multiverse where each moment > of time defines a different universe, memories of the past refer to > alternative universes. We need to keep in mind that in experiments we > can only ever directly measure the present state. But what does 'the present state' mean? The present second? The present milli-second? "Present" is not a relativistic concept.
Your pedantry is misplaced. The present state and the present moment are both sufficiently well-defined for quantum system essentially at rest relative to you in your laboratory. The view of some remote observer with relative velocity approaching that of light is not a relevant consideration.
That aside, however. I do think that Saibal's idea that "each moment of time defines a different universe" is a bit screwball.
> If you dig up a bone of a dinosaur, what you are seeing is a result of > processes in your brain right now. These are then the result of > photons interacting with your eye and ultimately you can draw an > inference about life on Earth, say, 150 million years ago. And you can draw an inference about a few tenths of a second ago. But you can't draw and inference about now.
But that is what you do in fact do. The laws of physics allow you to draw inferences from the present state into the future. Your pedantry is getting the better of you, Brent.
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