<p>Firstly, AdS/CFT has an entirely different notion of what &quot;emergence&quot; is. Emergence in this case is that a bulk subregion arises because of a type III<span class="math-container">$_{1}$</span> von Neumann algebra on the boundary side. Due to this, bulk causality arises, and among many other works, this result (due to Liu and Leutheusser) implies that a type III factor on the boundary gives us bulk subregions in a way. This is <em>not</em> &quot;disentanglement&quot;, whatever that means. Bulk means a gravitating Lorentzian manifold, and in AdS/CFT this is typically attributed to a type IIB string theory, whereas the boundary is attributed to an <span class="math-container">$\mathcal{N}=4$</span> SYM theory. I would suggest going through a good university level and the present status of general relativity, quantum field theory, etc. to actually know what these words mean.</p>

CC BY-SA 4.0
2023-09-28T16:01:36.800Z
2023-09-28T16:01:36.800Z
VaibhavK
<p>The model assumed here is that the vacuum is a coherent 4-d manifold, embedded in a background of quantum spacetime “foam”, or bulk. It is further assumed the bulk is itself disentangled, possessing no coherent metric.
In “Building up spacetime with quantum entanglement “ (M. van Raamsdonk, International Journal of Modern Physics D, 2010), the CFT/AdS correspondence is used to show that separate spacetimes emerge from complete quantum disentanglement.
What if the converse was true, i.e. introducing quantum fields into a disentangled spacetime “foam&quot; results in a single entangled spacetime, with a coherent metric (the vacuum). In the context of the Big Bang, the source of such intense energy fields might be a wormhole, or possibly a white hole.
The expansion rate of the vacuum formed in this way could be effectively infinite, as no coherent metric is in place in the bulk to enforce a limit. Energy density in the resulting vacuum might also be uniform. This would require that field energy above a threshold is distributed evenly to the vacuum, as it is formed.
The fundamental question asked is, is it possible for a coherent spacetime to arise from quantum foam, if sufficient entanglement energy is expressed by external fields?
If so, might particle creation in high energy accelerators offer evidence of this, i.e. point particles (or strings) are fields hosted in local spacetimes, formed from the background “foam&quot;? Could these local spacetimes themselves be an expression of the entrained field’s entanglement energy?</p>

CC BY-SA 4.0
2023-09-28T18:52:10.843Z
Two points: (1) Please use paragraphs. This is a wall of text. (2) This is not a site for asking pseudo questions.
David Hammen
<space-time><big-bang-theory><wormhole>
Could vacuum expansion arising from the Big Bang be a consequence of entanglement?
RalphW
# Could vacuum expansion arising from the Big Bang be a consequence of entanglement?

(Asked by: username_0 on 2023-09-27)

The model assumed here is that the vacuum is a coherent 4-d manifold, embedded in a background of quantum spacetime “foam”, or bulk. It is further assumed the bulk is itself disentangled, possessing no coherent metric.
In “Building up spacetime with quantum entanglement “ (M. van Raamsdonk, International Journal of Modern Physics D, 2010), the CFT/AdS correspondence is used to show that separate spacetimes emerge from complete quantum disentanglement.
What if the converse was true, i.e. introducing quantum fields into a disentangled spacetime “foam" results in a single entangled spacetime, with a coherent metric (the vacuum). In the context of the Big Bang, the source of such intense energy fields might be a wormhole, or possibly a white hole.
The expansion rate of the vacuum formed in this way could be effectively infinite, as no coherent metric is in place in the bulk to enforce a limit. Energy density in the resulting vacuum might also be uniform. This would require that field energy above a threshold is distributed evenly to the vacuum, as it is formed.
The fundamental question asked is, is it possible for a coherent spacetime to arise from quantum foam, if sufficient entanglement energy is expressed by external fields?
If so, might particle creation in high energy accelerators offer evidence of this, i.e. point particles (or strings) are fields hosted in local spacetimes, formed from the background “foam"? Could these local spacetimes themselves be an expression of the entrained field’s entanglement energy?

**Tags:** space-time, big-bang-theory, wormhole

> **Comments:**
> **username_1**: Two points: (1) Please use paragraphs. This is a wall of text. (2) This is not a site for asking pseudo questions.  

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## 1 answers

### Answer by username_2 on 2023-09-28. Score: 1

Firstly, AdS/CFT has an entirely different notion of what "emergence" is. Emergence in this case is that a bulk subregion arises because of a type III$\_{1}$ von Neumann algebra on the boundary side. Due to this, bulk causality arises, and among many other works, this result (due to Liu and Leutheusser) implies that a type III factor on the boundary gives us bulk subregions in a way. This is *not* "disentanglement", whatever that means. Bulk means a gravitating Lorentzian manifold, and in AdS/CFT this is typically attributed to a type IIB string theory, whereas the boundary is attributed to an $\mathcal{N}=4$ SYM theory. I would suggest going through a good university level and the present status of general relativity, quantum field theory, etc. to actually know what these words mean.


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