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Thread: Fermi Bubble Geometry and Mixmaster Model?

  1. #1 Fermi Bubble Geometry and Mixmaster Model? 
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    Dec 2009
    I recently read an article about fermi bubbles protruding from the galactic center and happened to come across a model of the universe proposed by Charles Misner. This model was originally used to describe a homogenous spacetime manifold with Einstein's equations simplified into differential equations. This model suggests that the universe expands in two different directions and contracts in the third. The model relies on the Bainchi division of Lie group maths and has been further researched by David Hobill who suggests that the model also works for an inhomogeneous manifold with oscillations present at the singularity of possibly large scale structures and /or galaxy formations. What immediately captured my attention is how the simulated graphic of of the Mixmaster model is generally similar to the fermi bubbles at the galactic center. I could attempt to attach a picture from the book to compare if google does not turn up the grapic.What are the possible configurations of such phenomena and what does it say about the underlying mechanics of the entire system? Any ideas?Citation: Chaos in the Cosmos: The Stunning Complexity of the Universe by Barry Parker

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  3. #2  
    Moderator Moderator Markus Hanke's Avatar
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    Nov 2011
    Interesting - it never occured to me that you can throw isotropy out the window, and I hadn't come across the Mixmaster model before. I am going to read up about this a little further, however, purely mathematically the metric is pretty complicated and permits very many different configurations.

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  4. #3  
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    Aug 2012
    A NASA article, with short video, about the discovery of the Fermi "bubbles".
    Please see embedded link to view additional briefing materials.

    And the NASA Planck mission index.
    NASA - Planck
    In part, this little article makes the following hopefully pertinent comment,

    "Synchrotron emission, a type of non-thermal radiation generated by charged particles, associated with the galactic haze seen by Planck, exhibits distinctly different characteristics from the synchrotron emission seen elsewhere in the Milky Way. Diffuse synchrotron emission in the galaxy is interpreted as radiation from highly energetic electrons that have been accelerated in shocks created by supernova explosions. Compared to this well-studied emission, the galactic haze has a "harder" spectrum, meaning that its emission does not decline as rapidly with increasing frequency.

    Several explanations have been proposed for this unusual behavior, including enhanced supernova rates, galactic winds and even annihilation of dark-matter particles. Thus far, none of them have been confirmed and the issue remains open.
    PhysOrg reports on the gamma ray beams, a.k.a. "jets".

    None of the preceding material has to do with the mixmaster model, but hopefully the background information on the Fermi bubbles will be interesting.

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