Week 5 Theories 1

Describe the difference between baryonic and non-baryonic matter.
Explain for each type of matter how it could contribute to dark matter.
Evaluate the strength of the arguments for whether dark matter is likely to be composed of baryonic or non baryonic matter

Comments

  1. Matt Brake23 November 2017 at 05:53

    Baryonic Matter is the matter that only includes matter composed of baryons. In other words, it should include protons, neutrons and all the objects composed of them, but it excludes things such as electrons and neutrinos which are composed of leptons instead of baryons. whereas Non-baryonic matter is matter that, unlike all the kind of matter we are familiar with, it is not made of baryons (including the neutrons and protons found in all atomic nuclei). Proposed as a possible form of dark matter, it could come in two forms; classified as cold non-baryonic matter or hot non-baryonic matter.

    Neutrinos are one candidate for dark matter but only if they have a nonzero rest mass. Neutrinos interact only via the weak force and gravity which would explain we don't see dark matter. furthermore there are also so many neutrinos that even if they only had a mass one five thousandth that of the electron, the mass of all the neutrinos in the universe could make up for the missing matter therefore is this an answer to where all the missing matter is?

    meanwhile baryonic matter is the normal matter that we observe which is very distinct to non-baryonic(the matter which is involved in dark matter). protons and neutrons are made from baryonic matter and therefor cannot interact or have anything to do with dark matter.

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  2. Unknown27 November 2017 at 05:52

    Baryonic matter means that something is only composed of baryons. Basically, it should include protons, neutrons and all the objects composed of them, ie atomic nuclei. However the term ‘baryonic’ can also refer to all objects made of normal atomic matter.

    Baryonic matter could compose a small amount of dark matter.

    Non baryonic matter could come in two forms, classified as cold non-baryonic matter or hot non-baryonic matter; hot non-baryonic matter would be made of particles moving very fast, such as neutrinos. Non-baryonic matter (hot or cold) is supposed to interact weakly with radiation. Therefore, the imprints left by the non-baryonic matter in the cosmic background radiation would be different than those left by the baryonic matter.
    Neutrinos are considered non-baryonic, this means they're not made of baryons.

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