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Thread: a problem article: axions as new ideas for DM? i'll need to take a deeper look

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    Default a problem article: axions as new ideas for DM? i'll need to take a deeper look



    Is there something here? I'm puzzled by the article.

    https://phys.org/news/2019-02-team-i...ture-dark.html
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    Default Re: a problem article: axions as new ideas for DM? i'll need to take a deeper look

    It's like an astrophysics commercial. And if you act in the next 10 minutes, they'll double their offer! Two for the price of one!

    Of course, zero plus zero...
    Bryan

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    Default Re: a problem article: axions as new ideas for DM? i'll need to take a deeper look

    Quote Originally Posted by bladekeeper View Post
    It's like an astrophysics commercial. And if you act in the next 10 minutes, they'll double their offer! Two for the price of one!

    Of course, zero plus zero...

    Love the new sig

    Been a busy day and the arXiv preprint was slightly more elusive than usual but a bounce off of CERN got the beastie.

    https://arxiv.org/abs/1810.00978

    And if you think the article was gobbledygook check out the abstract!

    The state of a static spherically symmetric relativistic axionically active multi-component plasma in the gravitational, magnetic and electric fields of an axionic dyon is studied in the framework of the Einstein - Maxwell - Boltzmann - axion theory. We assume that the equations of axion electrodynamics, the covariant relativistic kinetic equations, and the equation for the axion field with modified Higgs-type potential are nonlinearly coupled; the gravitational field in the dyon exterior is assumed to be fixed and to be of the Reissner-Nordström type. We introduce the extended Lorentz force, which acts on the particles in the axionically active plasma, and analyze the consequences of this generalization. The analysis of exact solutions, obtained in the framework of this model for the relativistic Boltzmann electron-ion and electron-positron plasmas, as well as, for degenerated zero-temperature electron gas, shows that the phenomena of polarization and stratification can appear in plasma, attracting attention to the axionic analog of the known Pannekoek-Rosseland effect.
    Now that gives me a headache! I still can't tell if there is anything here or if it's just big words trying to act as airfoils to loft this opus away from a circular trash can. If I had sense, I'd give up. And I will since I'm in the mood for escapist video at the moment. I feel like maybe watching one of the Marvel mayhem movies since I'm not in the mood for thought.
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  7. #4
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    Default Re: a problem article: axions as new ideas for DM? i'll need to take a deeper look

    The issue that had me most curious about the paper was the idea of an axion dyon. So on reading the pdf I discovered that the origin of the don was a paper by Witten on monopoles.

    Dyons of Charge e theta/2 pi - INSPIRE-HEP

    It turns out that the 't Hooft-Polyakov magnetic monopole doesn't have integral quantized spin. This means that, for my money, the best reason for investigating them disappears. As noted in the second post in this thread SWaB: the only detection of a magnetic monopole Dirac monopoles have the attraction of explaining quantized charges as a consequence.

    So.... I satisfied my curiosity about what an axion dyon is, have decided it is completely uninteresting (to me) as a construct, YMMV. The rest of the paper is an attempt to set up the relativistic plasma physics of such particles and boring.

    Dyons apparently come in flavors, hence additional confusions.

    https://en.wikipedia.org/wiki/Dyon
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    Default Re: a problem article: axions as new ideas for DM? i'll need to take a deeper look

    Sometimes an article that I don't like very much accidentally stimulates interesting ideas. This article led to such a serendipitous idea.

    I've been interested in monopoles of the Dirac type for a long time as an approach to the fine tuning problem as mentioned. So it seemed to me that it would be interesting if say in the Kaluza Klein Theory (a geometric theory of both gravity and electrodynamics that lives in a five dimensional space time, one dimension rolled up into loops) there were Dirac monopoles. If I knew of such work, I had forgotten about it.

    So I found:

    https://aip.scitation.org/doi/abs/10...ournalCode=apc

    https://www.sciencedirect.com/scienc...50321383904625

    We demonstrate that the five-dimensional Kaluza-Klein theory of unified gravity and electromagnetism admits soliton solutions. These are regular, static and stable solutions of the field equations which correspond, upon quantization, to particles. The solitons include magnetic monopoles, which obey the Dirac quantization condition, as well as magnetic dipoles which are topologically stable. The inertial mass of the solitons is typically of order mp/e, where mp is the Planck mass and e the electric charge. These solitons have bizarre gravitational interactions; in fact they exert no newtonian force on slowly moving test particles, thus they have zero gravitational mass. We explain how the inequality of the gravitational and inertial masses is due to the violation of Birkhoff's theorem in Kaluza-Klein theories and is consistent with the principle of equivalence.
    This is an important paper by Gross which has a rich citation history:
    Magnetic Monopoles in Kaluza-Klein Theories - INSPIRE-HEP

    So there is already a body of work that won't have to be redone. I just need to sift through it and look for the existence or nonexistence of opportunities for fine tuning.
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    Default Re: a problem article: axions as new ideas for DM? i'll need to take a deeper look

    A typo that is my fault, not the spell checker for once.....

    Quote Originally Posted by not_Fritz_Argelander View Post
    The issue that had me most curious about the paper was the idea of an axion dyon. So on reading the pdf I discovered that the origin of the don was a paper by Witten on monopoles.

    Dyons of Charge e theta/2 pi - INSPIRE-HEP

    It turns out that the 't Hooft-Polyakov magnetic monopole doesn't have integral quantized spin. This means that, for my money, the best reason for investigating them disappears. As noted in the second post in this thread SWaB: the only detection of a magnetic monopole Dirac monopoles have the attraction of explaining quantized charges as a consequence.

    So.... I satisfied my curiosity about what an axion dyon is, have decided it is completely uninteresting (to me) as a construct, YMMV. The rest of the paper is an attempt to set up the relativistic plasma physics of such particles and boring.

    Dyons apparently come in flavors, hence additional confusions.

    https://en.wikipedia.org/wiki/Dyon
    Should read:
    It turns out that the 't Hooft-Polyakov magnetic monopole doesn't have integral quantized charge.
    Anyway there is, in addition, news. It seems that GR & Einstein Cartan Sciama Kibble gravity & Kaluza Klein theories can (from the literature I've skimmed so far) have promising properties when made to play together.

    It looks like what I want to do is to play with ECSK gravity with KK added in and assure it reduces to GR in the low energy large distance limit.

    Combining ECSK with KK has already been done but with some assumptions that I think artificially eliminate some chances for interesting physics. For instance there looks to be chances not only for using the KK side to solve the fine tuning problem but the CP problem as well (and therefore the matter-antimatter asymmetry), plus dark matter and dark energy.

    I can understand why folks do string theory though instead. The maths are so much easier..... I have a headache. Which is good.
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    Default Re: a problem article: axions as new ideas for DM? i'll need to take a deeper look

    Well at least if you disappear into either a) your study or b) a hidden dimension, we will know you are working on something interesting.
    "Look up at the stars, not down at your feet." Stephen Hawking
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    Default Re: a problem article: axions as new ideas for DM? i'll need to take a deeper look

    Quote Originally Posted by GCoyote View Post
    Well at least if you disappear into either a) your study or b) a hidden dimension, we will know you are working on something interesting.
    There's also a very good chance I'll decide there's no way in Tartarus that my math skills are up to it.
    https://en.m.wikipedia.org/wiki/Tartarus
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    Default Re: a problem article: axions as new ideas for DM? i'll need to take a deeper look

    Fritz messes with this stuff too much there is a non-zero (but still very, very tiny) chance he'll run into these guys:

    https://en.wikipedia.org/wiki/Hounds_of_Tindalos


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    Default Re: a problem article: axions as new ideas for DM? i'll need to take a deeper look

    Quote Originally Posted by ThinkerX View Post
    Fritz messes with this stuff too much there is a non-zero (but still very, very tiny) chance he'll run into these guys:

    https://en.wikipedia.org/wiki/Hounds_of_Tindalos

    Sounds like you are suggesting I unretire and go back to work for gubmint.
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