Non-locality and the Bekenstein bound?

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Discussion Overview

The discussion revolves around the relationship between non-locality and the Bekenstein bound, particularly how information content is perceived in the context of local and non-local states. It explores theoretical implications and conceptual challenges regarding locality, causality, and the nature of information in physics.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests that while the amount of information is bounded for a fixed volume, this raises questions about how local information content can coexist with non-local states, as evidenced by entanglement.
  • Another participant shares a quote emphasizing that objectivity does not require a shared reality among observers, but rather that their realities must be consistent, which implies that complete information is locally accessible.
  • A different participant notes that events outside a causal light cone cannot affect an observer, highlighting that non-local entanglement cannot be used for information transmission, despite its existence.
  • It is mentioned that expanding the boundary of a fixed volume can lead to new information being included, suggesting that the location of information is not straightforward, referencing Leonard Susskind's views.

Areas of Agreement / Disagreement

Participants express differing views on the implications of locality and non-locality regarding information content, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

Participants acknowledge the complexity of defining where information resides and the implications of non-locality on causality, but do not resolve these issues.

nomadreid
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On one side, the amount of information is bounded above for any fixed volume of space: this would seem (?) to indicate that information content is local. Yet physical states are not necessarily local, as non-local entanglement shows. So how do you have local information content of a non-local state?
:confused:
 
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I saved the following which I liked a lot from another discussion in these forums:

The rule for objectivity is not that everyone lives in the same reality, it is that no two observers' realities can be inconsistent with each other. This also means that "complete" information does not imply a unique description of the reality, it merely implies access to all the information that is locally available to that observer in principle. The locality of the information is what preserves causality…”
 
Naty1, interesting quote. I shall mull it over. Thanks.
 
As you probably know, anything outside your timelike [causal] light cone has no effect on you...all the 'space like' stuff is non casual...

and as you also probably know, non local entanglement cannot be used to convey information...
it happens, but we can't utilize it for information transmission.

Also, note that for any 'fixed volume of space' boundary, all you have to do is expand that boundary take a new look, and, viola, all the information resides on the new, larger boundary, along with some new...Just where information 'resides' is not all that clear according to Leonard Susskind.

All in all very intriguing!
 

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