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University researcher(s)

    Cosmological constraints on neutrinos

    Zhu, Ruoyu

    [Thesis]. Manchester, UK: The University of Manchester; 2020.

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    Abstract

    Neutrino cosmology has been a research area of interests in recent years. From the information related to neutrinos left from the Cosmic Microwave Background (CMB), we could learn things in different epochs during the evolution of the Universe. Mostly, N_eff and sigma m_nu are the parameters to constrain neutrinos from observations. The underlying physics background of these two parameters can help us answer the following questions: how much do neutrinos account for the total energy density of the present Universe? Do they behave as massive particles or as radiation at the present time? Does the Universe that we live in have more neutrino species than what we have detected, or is there just a tiny fraction of them in the Universe? In this thesis, the constraints on N_eff and sigma m_nu are investigated in models that include active and sterile neutrinos. The results were obtained by performing parameter estimations by using the CosmoMC code, the Planck 2015 and 2018 data.

    Keyword(s)

    constraints ; neutrinos

    Bibliographic metadata

    Type of resource:
    Content type:
    Administered thesis
    Form of thesis:
    Traditional
    Type of submission:
    Doctoral level ETD - final
    Thesis title:
    Cosmological constraints on neutrinos
    Degree type:
    Master of Science by Research
    Degree programme:
    MSc by Research in Astronomy and Astrophysics
    Publication date:
    2020-01-13T15:51:32
    Institution:
    The University of Manchester
    Location:
    Manchester, UK
    Total pages:
    115
    Abstract:
    Neutrino cosmology has been a research area of interests in recent years. From the information related to neutrinos left from the Cosmic Microwave Background (CMB), we could learn things in different epochs during the evolution of the Universe. Mostly, N_eff and sigma m_nu are the parameters to constrain neutrinos from observations. The underlying physics background of these two parameters can help us answer the following questions: how much do neutrinos account for the total energy density of the present Universe? Do they behave as massive particles or as radiation at the present time? Does the Universe that we live in have more neutrino species than what we have detected, or is there just a tiny fraction of them in the Universe? In this thesis, the constraints on N_eff and sigma m_nu are investigated in models that include active and sterile neutrinos. The results were obtained by performing parameter estimations by using the CosmoMC code, the Planck 2015 and 2018 data.
    Keyword(s):
    Thesis main supervisor(s):
    Thesis co-supervisor(s):
    Degree grantor:
    Language:
    en

    Institutional metadata

    University researcher(s):

    Record metadata

    Manchester eScholar ID:
    uk-ac-man-scw:323201
    Created by:
    Zhu, Ruoyu
    Created:
    13th January, 2020, 15:51:32
    Last modified by:
    Zhu, Ruoyu
    Last modified:
    6th February, 2020, 10:31:54

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