Dark matter may be hiding in a hidden sector

Discussion in 'Astronomy, Exobiology, & Cosmology' started by paddoboy, Nov 11, 2016.

  1. paddoboy Valued Senior Member

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    Dark matter may be hiding in a hidden sector
    November 11, 2016 by Lisa Zyga feature

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    This image shows the galaxy cluster Abell 1689, with the mass distribution of the dark matter in the gravitational lens overlaid (in purple). The mass in this lens is made up partly of normal (baryonic) matter and partly of dark matter. Credit: NASA, ESA, E. Jullo (JPL/LAM), P. Natarajan (Yale) and J-P. Kneib (LAM).
    (Phys.org)—Currently, one of the strongest candidates for dark matter is weakly interacting massive particles, or WIMPS, although so far this hypothetical particle has not yet been directly detected. Now in a new study, physicists have proposed that dark matter is not a WIMP, and further, it is not any particle that is so far known or theorized to exist.



    Instead, the physicists argue that dark matter is made of particles from one of the many "hidden sectors" that are thought to exist outside of the "visible sector" that encompasses our entire visible world. The team of researchers, Bobby Acharya, Sebastian Ellis, Gordon Kane, Brent Nelson, and Malcolm Perry, from institutions in the UK, Italy, and the US, has published their study in a recent issue of Physical Review Letters.

    Hidden sectors are so-named because particles in these sectors don't feel the strong and electroweak forces like those in the visible sector do, which greatly reduces their interaction with the visible sector. So hidden sector particles could be all around us—we just currently have no way to detect them.



    Read more at: http://phys.org/news/2016-11-dark-hidden-sector.html#jCp
     
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  3. paddoboy Valued Senior Member

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    https://arxiv.org/pdf/1604.05320v1.pdf

    The lightest visible-sector supersymmetric particle is likely to be unstable:


    Abstract:

    We argue, based on typical properties of known solutions of string/M-theory, that the lightest supersymmetric particle of the visible sector will not be stable. In other words, dark matter is not a particle with Standard Model quantum numbers, such as a WIMP. The argument is simple and based on the typical occurrence of a) hidden sectors, b) interactions between the Standard Model (visible) sector and these hidden sectors, and c) the lack of an argument against massive neutral hidden sector particles being lighter than the lightest visible supersymmetric particle. These conclusions do not rely on arguments such as R-parity violation.
     
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  5. Xelasnave.1947 Valued Senior Member

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    Thank you Paddoboy.
    So good to come to the site and find someone still interested in science and over politics.
    Alex
     
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