3
   

What does "that" refer to here?

 
 
Reply Wed 25 Nov, 2015 08:19 am
1) "that" refers back to "conditions"
2) "properties"
3) "energy density"

Context::

Now, Ooguri and his collaborators have found that quantum entanglement is the key to solving this question. Using a quantum theory (that does not include gravity), they showed how to compute energy density, which is a source of gravitational interactions in three dimensions, using quantum entanglement data on the surface. This is analogous to diagnosing conditions inside of your body by looking at X-ray images on two-dimensional sheets. This allowed them to interpret universal properties of quantum entanglement as conditions on the energy density that should be satisfied by any consistent quantum theory of gravity, without actually explicitly including gravity in the theory. The importance of quantum entanglement has been suggested before, but its precise role in emergence of spacetime was not clear until the new paper by Ooguri and collaborators.

More:
http://www.eurekalert.org/pub_releases/2015-05/uot-hsi052715.php
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Type: Question • Score: 3 • Views: 675 • Replies: 11
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View best answer, chosen by oristarA
PUNKEY
 
  2  
Reply Wed 25 Nov, 2015 10:26 am
@oristarA,
properties (of quantum entanglement as conditions on the energy density)
that
oristarA
 
  1  
Reply Wed 25 Nov, 2015 10:30 am
@PUNKEY,
PUNKEY wrote:

properties (of quantum entanglement as conditions on the energy density)
that


Thanks.
Why not "conditions" (satisfied by the theory)?
PUNKEY
 
  0  
Reply Wed 25 Nov, 2015 10:44 am
Because the rest of the sentence refers to theories. That's how I read it.

I see what you mean that it could refer to conditions, but I think it is talking about principles and theories.

0 Replies
 
ehBeth
 
  1  
Reply Wed 25 Nov, 2015 10:48 am
@oristarA,
You're breaking the phrases up incorrectly.

Look at it again.
0 Replies
 
InfraBlue
 
  0  
Reply Wed 25 Nov, 2015 11:46 am
"That" refers to the entire phrase: "universal properties of quantum entanglement as conditions on the energy density."
0 Replies
 
Tes yeux noirs
 
  2  
Reply Wed 25 Nov, 2015 12:40 pm
I am afraid I have to differ. Conditions are things that require to be satisfied.
0 Replies
 
Tes yeux noirs
 
  2  
Reply Wed 25 Nov, 2015 12:46 pm
Also look at the sentence, and consider the 'interpret' ... 'as' structure:

This allowed them to interpret universal properties of quantum entanglement as conditions on the energy density that should be satisfied by any consistent quantum theory of gravity.
0 Replies
 
PUNKEY
 
  0  
Reply Wed 25 Nov, 2015 01:35 pm
This makes sense:
This allowed them to interpret universal properties that should be satisfied by any consistent quantum theory of gravity, without actually explicitly including gravity in the theory.

"of quantum entanglement as conditions on the energy density" modifies properties.
Tes yeux noirs
 
  2  
Reply Wed 25 Nov, 2015 01:56 pm
@PUNKEY,
Properties that should be satisfied? How do you satisfy properties, especially when there are conditions in plain view (that you are ignoring for some reason)?
0 Replies
 
Tes yeux noirs
  Selected Answer
 
  2  
Reply Wed 25 Nov, 2015 01:57 pm
@oristarA,
Quote:
Why not "conditions" (satisfied by the theory)?

Why not indeed? "That" refers to "conditions". Conditions that should be satisfied.

Here condtions = prerequisites


oristarA
 
  1  
Reply Wed 25 Nov, 2015 10:33 pm
@Tes yeux noirs,
It is obviously clearer.
Thank you Tes.
And thanks to all who have paid attention to this thread.

0 Replies
 
 

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