What is the Role of Conformal Symmetry in De Sitter Relativity?

In summary, the role of conformal symmetry in De Sitter relativity is to provide a powerful tool for understanding the dynamics of spacetime in the context of a universe with a positive cosmological constant. This symmetry allows for a better understanding of the geometry of spacetime and the behavior of physical fields, leading to a more complete understanding of the universe and its evolution. Additionally, conformal symmetry plays a crucial role in the holographic principle, which suggests that the entire universe can be described by a lower-dimensional boundary theory. Overall, the use of conformal symmetry in De Sitter relativity has greatly enhanced our understanding of the universe and its fundamental principles.
  • #1
yoda jedi
397
1
De Sitter Relativity: a New Road to Quantum Gravity
http://www.springerlink.com/content/g6275857g60638h8/fulltext.pdf

...When applied to the whole universe, de Sitter special relativity is able to predict,from the current matter content of the universe, the value of cosmological constant (lambda). It gives, furthermore,an explanation for the cosmic coincidence problem.When applied to study the propagation of ultra-high energy photons, it gives a good estimate for the recently observed delay in high energy gamma-ray flares coming from the center of the galaxy Markarian 501. If this delay is a manifestation of the small-scale fluctuations in the texture of spacetime, predicted to exist at very high energies, de Sitter relativity can be seen as a new paradigm to approach quantum gravity.....

...Even though conformal symmetry is not an exact symmetry at low energies, according to de Sitter special relativity it naturally becomes the relevant symmetry at ultra-high energy densities. In fact, the higher the energy density, the higher the value of lambda, the higher the importance of conformal symmetry. Near the Planck energy, the local value of lambda will be very large, and the local de Sitter space will approach a conespacetime, which is transitive under proper conformal transformations only. Under such extreme conditions, physics becomes conformal invariant, and the proper conformal current will be conserved...
 
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  • #3
This is the source study?: http://arxiv.org/abs/0708.2889

Seems to underly a lot of the observational portion of the piece. The thinking seems sound at high energies, but I don't find the MAGIC data convincing, although I respect their free admission of possible interference.

This seems like a lot to justify on the basis of choosing a possible source of delay when others with less global implications may well exist.
 
  • #4
Frame Dragger said:
This is the source study?: http://arxiv.org/abs/0708.2889

Seems to underly a lot of the observational portion of the piece. The thinking seems sound at high energies, but I don't find the MAGIC data convincing, although I respect their free admission of possible interference.

This seems like a lot to justify on the basis of choosing a possible source of delay when others with less global implications may well exist.

of the first post, yes.



but of the second post:

http://star.herts.ac.uk/~granot/papers/GRB090510_Nature.pdf
or
http://arxiv.org/ftp/arxiv/papers/0908/0908.1832.pdf

...We stress here that our most conservative limits, a and b in Table 1,
rely on very different and largely independent analysis, yet still give a
very similar limit, of [tex]\xi[/tex]1>.1.2. This lends considerable support to this
result, and makes it more robust and secure than for each of the methods separately....




-----------------------
...Giovanni Amelino-Camelia of the University of Rome La Sapienza believes that the latest work points to the coming of age of the field of quantum gravity phenomenology, with physicists finally able to submit theories of quantum gravity to some kind of experimental test. "Nature, with its uniquely clever ways, might have figured out how to quantize space–time without affecting relativity".....


-----------------------
loop quantum gravity, string theory, dead.
 
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  • #5
yoda jedi said:
of the first post, yes.



but of the second post:

http://star.herts.ac.uk/~granot/papers/GRB090510_Nature.pdf

We stress here that our most conservative limits, a and b in Table 1,
rely on very different and largely independent analysis, yet still give a
very similar limit, of [tex]\xi[/tex]1>.1.2. This lends considerable support to this
result, and makes it more robust and secure than for each of the methods separately.

Fair enough, I suppose it's just up against stiff competiton. ;)
 
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  • #6
Frame Dragger said:
Fair enough, I suppose it's just up against stiff competiton. ;)



...laughs...

well... we have to progress
 
  • #7
....still stand, Elze.


Zloshchastiev dead.


Wang, who knows...




Svetlichny, maybe dead.

cos,http://arxiv1.library.cornell.edu/PS_cache/quant-ph/pdf/0410/0410230v1.pdf

...At the Planck scale, nonlinear effects may be of the same order of magnitude
as linear ones...
 
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1. What is the "Road to Quantum Gravity"?

The "Road to Quantum Gravity" refers to the ongoing scientific journey to develop a theory that unifies the two main pillars of modern physics: quantum mechanics and general relativity. This theory would provide a complete understanding of the fundamental nature of the universe, from the smallest subatomic particles to the largest structures in the cosmos.

2. Why is quantum gravity important?

Quantum gravity is important because it aims to resolve some of the fundamental questions and paradoxes in physics, such as the nature of space and time, the behavior of matter at the smallest scales, and the origin of the universe. It also has potential practical applications, such as improving our understanding of black holes and developing new technologies.

3. What are the current approaches to solving the problem of quantum gravity?

There are several different approaches to quantum gravity, including string theory, loop quantum gravity, and causal dynamical triangulation. Each of these theories has its own set of principles and mathematical framework, but they all share the goal of unifying quantum mechanics and general relativity.

4. What challenges are scientists facing in the search for quantum gravity?

One major challenge in the search for quantum gravity is the lack of experimental evidence. Currently, there is no way to directly test these theories, making it difficult to determine which one (if any) is correct. Additionally, the mathematical complexity of these theories and the need for new mathematical tools also present challenges for scientists.

5. When do scientists expect to find a solution to the problem of quantum gravity?

It is difficult to predict when a solution to the problem of quantum gravity will be found. Some scientists believe that it may take decades or even centuries to develop a complete theory, while others are more optimistic and believe that breakthroughs could happen in the near future. Ultimately, the timeline will depend on the progress and advancements in technology and theoretical understanding.

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