Can Quantum Gravity Allow Spacetime and Matter to Interchange?

In summary, supersymmetry allows for the interchange of bosons and fermions, and this concept may have a parallel in quantum gravity where spacetime and matter can transform into each other. This idea was explored by Einstein in his Unified Field theory, and a modern day equivalent is presented in the paper "Fields as Bodies" by David Wallace. This paper demonstrates that internal gauge symmetry and spacetime symmetry can be treated on equal footing, making gravitational theories analogous to gauge theories. Some background on this topic is also provided by Susskind's book "Theoretical Minimum".
  • #1
lucas_
413
23
Supersymmetry interachanges bosons and fermions and can make bosons transform into fermions and vice versa...

is there equivalent in quantum gravity where spacetime and matter can transform to each other and spacetime can become matter and matter can become spacetime..

isn't something akin to this was what Einstein had been working on in the Unified Field theory? What's the modern day equivalent of interachanging spacetime and matter.. any papers, references, studies?
 
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  • #2
Perhaps this might be of interest :
http://arxiv.org/abs/1502.06539
Fields as Bodies: a unified presentation of spacetime and internal gauge symmetry
David Wallace
(Submitted on 23 Feb 2015)
Using the parametrised representation of field theory (in which the location in spacetime of a part of a field is itself represented by a map from the base manifold to Minkowski spacetime) I demonstrate that in both local and global cases, internal (Yang-Mills-type) and spacetime (Poincar\'{e}) symmetries can be treated precisely on a par, so that gravitational theories may be regarded as gauge theories in a completely standard sense
 
  • #3
kewl

Not that I fully understand it, but reading Susskind TM (book 1) has got me further into it before losing track.
 
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1. What is emergent spacetime and matter?

Emergent spacetime and matter is a theory that suggests that the fundamental building blocks of the universe, such as space, time, and matter, are not fundamental at all, but rather arise from more basic, underlying components. This theory challenges traditional notions of the fabric of the universe and suggests that it is constantly evolving and emergent rather than fixed and fundamental.

2. How does the concept of emergent spacetime and matter differ from traditional theories?

Traditional theories, such as Newtonian physics and Einstein's theory of general relativity, view space, time, and matter as fundamental and unchanging. Emergent spacetime and matter, on the other hand, suggests that these components are not fundamental, but rather emerge from more basic components and are constantly evolving.

3. What are some examples of emergent spacetime and matter in action?

One example of emergent spacetime is the phenomenon of gravity. In traditional theories, gravity is viewed as a fundamental force, but in emergent spacetime and matter, it is seen as an emergent property of the curvature of spacetime caused by the presence of mass and energy. Another example is the behavior of fluids, such as water, which can exhibit emergent properties such as surface tension and viscosity.

4. What evidence supports the theory of emergent spacetime and matter?

There is currently no definitive evidence that supports the theory of emergent spacetime and matter. However, some evidence suggests that spacetime may not be as fundamental as previously thought. For example, quantum mechanics suggests that spacetime may be quantized, meaning that it is not continuous but rather made up of discrete units. Additionally, the behavior of particles at extremely small scales, such as those studied in particle accelerators, seems to support the idea of emergent properties.

5. How does the theory of emergent spacetime and matter impact our understanding of the universe?

The theory of emergent spacetime and matter challenges traditional notions of the universe and our place within it. It suggests that the universe is constantly evolving and emergent, rather than fixed and fundamental. This has implications for our understanding of the laws of physics and the nature of reality. It also opens up new avenues for scientific exploration and may lead to a better understanding of the fundamental nature of the universe.

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