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Author Topic: How do we make spacetime?  (Read 1902 times)

Offline QuantumClue

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How do we make spacetime?
« on: 01/02/2011 10:35:57 »
Yesterday, youron asked the question, how do we make spacetime? Ironically, today, I came across a reference where a physicist has devloped a recipe!

http://stardrive.org/index.php?option=com_content&view=article&id=3265:how-to-cook-up-foamy-space-time-in-the-lab&catid=43:science&Itemid=82


 

Offline graham.d

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How do we make spacetime?
« Reply #1 on: 01/02/2011 14:02:51 »
A headline grabbing science article but it is not really creating spacetime but a macroscopic analog of it. The "quanta" of spacetime (in quantum foam) are of a size of the order of a Planck length so not easy to recreate in a lab (or if you do, to know that you have done so).
 

Offline syhprum

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How do we make spacetime?
« Reply #2 on: 01/02/2011 15:25:00 »
I have read the original article http://arxiv.org/ftp/arxiv/papers/1101/1101.4625.pdf and find it quite incomprehensible, modern physics seems to be the art of deriving bizarrely complex mathematics from simple ideas.
 

Offline graham.d

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How do we make spacetime?
« Reply #3 on: 01/02/2011 16:16:14 »
The main problem with papers like this, and they are very typical, is that they assume a vast background of esoteric knowledge of the subject and quote equations from previous work which most people would not be familiar with unless a specialist in the field. What the author is claiming (I think) is that by using metamaterials whose refractive indices are not a simple number but depend on the orientation and defined as a tensor, the behavior can be analogous to curved space defined by a mathematically similar tensor. Light passing through such a region can behave similarly to a mass in an mathematically analogous metric.
 

Offline yor_on

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How do we make spacetime?
« Reply #4 on: 01/02/2011 21:22:58 »
Wow :)

Seems that there is a lot of new ideas of how to exploit light those days. All from mimicking black holes to 'space foam' :) Nice one QC, and thnx for the explanation Graham.
==

And yeah, me, I'm still stuck wondering about the Bonnor beam
« Last Edit: 01/02/2011 21:24:47 by yor_on »
 

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How do we make spacetime?
« Reply #4 on: 01/02/2011 21:22:58 »

 

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