Warm dark matter does not do better than cold dark matter in solving small-scale inconsistencies

Aurel Schneider, Donnino Anderhalden, Andrea Maccio, Jürg Diemand

    Research output: Contribution to journalArticle

    Abstract

    Over the last decade, warm dark matter (WDM) has been repeatedly proposed as an alternative scenario to the standard cold dark matter (CDM) one, potentially resolving several disagreements between the CDM model and observations on small scales. Here, we reconsider the most important CDM small-scale discrepancies in the light of recent observational constraints on WDM. As a result, we find that a conventional thermal (or thermal-like) WDM cosmology with a particle mass in agreement with Lyman α is nearly indistinguishable from CDM on the relevant scales and therefore fails to alleviate any of the small-scale problems. The reason for this failure is that the power spectrum of conventional WDM falls offtoo rapidly. To maintain WDM as a significantly different alternative to CDM, more evolved production mechanisms leading to multiple dark matter components or a gradually decreasing small-scale power spectrum have to be considered.

    Original languageEnglish (US)
    Article numberslu034
    JournalMonthly Notices of the Royal Astronomical Society: Letters
    Volume441
    Issue number1
    DOIs
    StatePublished - Jan 1 2014

    Fingerprint

    dark matter
    power spectra
    cold
    particle mass
    cosmology

    Keywords

    • Cosmology: Theory
    • Dark matter
    • Galaxies: Haloes

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Warm dark matter does not do better than cold dark matter in solving small-scale inconsistencies. / Schneider, Aurel; Anderhalden, Donnino; Maccio, Andrea; Diemand, Jürg.

    In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 441, No. 1, slu034, 01.01.2014.

    Research output: Contribution to journalArticle

    Schneider, Aurel ; Anderhalden, Donnino ; Maccio, Andrea ; Diemand, Jürg. / Warm dark matter does not do better than cold dark matter in solving small-scale inconsistencies. In: Monthly Notices of the Royal Astronomical Society: Letters. 2014 ; Vol. 441, No. 1.
    @article{d209e33957534a85bc1d5e99a38b707f,
    title = "Warm dark matter does not do better than cold dark matter in solving small-scale inconsistencies",
    abstract = "Over the last decade, warm dark matter (WDM) has been repeatedly proposed as an alternative scenario to the standard cold dark matter (CDM) one, potentially resolving several disagreements between the CDM model and observations on small scales. Here, we reconsider the most important CDM small-scale discrepancies in the light of recent observational constraints on WDM. As a result, we find that a conventional thermal (or thermal-like) WDM cosmology with a particle mass in agreement with Lyman α is nearly indistinguishable from CDM on the relevant scales and therefore fails to alleviate any of the small-scale problems. The reason for this failure is that the power spectrum of conventional WDM falls offtoo rapidly. To maintain WDM as a significantly different alternative to CDM, more evolved production mechanisms leading to multiple dark matter components or a gradually decreasing small-scale power spectrum have to be considered.",
    keywords = "Cosmology: Theory, Dark matter, Galaxies: Haloes",
    author = "Aurel Schneider and Donnino Anderhalden and Andrea Maccio and J{\"u}rg Diemand",
    year = "2014",
    month = "1",
    day = "1",
    doi = "10.1093/mnrasl/slu034",
    language = "English (US)",
    volume = "441",
    journal = "Monthly Notices of the Royal Astronomical Society: Letters",
    issn = "1745-3925",
    publisher = "Oxford University Press",
    number = "1",

    }

    TY - JOUR

    T1 - Warm dark matter does not do better than cold dark matter in solving small-scale inconsistencies

    AU - Schneider, Aurel

    AU - Anderhalden, Donnino

    AU - Maccio, Andrea

    AU - Diemand, Jürg

    PY - 2014/1/1

    Y1 - 2014/1/1

    N2 - Over the last decade, warm dark matter (WDM) has been repeatedly proposed as an alternative scenario to the standard cold dark matter (CDM) one, potentially resolving several disagreements between the CDM model and observations on small scales. Here, we reconsider the most important CDM small-scale discrepancies in the light of recent observational constraints on WDM. As a result, we find that a conventional thermal (or thermal-like) WDM cosmology with a particle mass in agreement with Lyman α is nearly indistinguishable from CDM on the relevant scales and therefore fails to alleviate any of the small-scale problems. The reason for this failure is that the power spectrum of conventional WDM falls offtoo rapidly. To maintain WDM as a significantly different alternative to CDM, more evolved production mechanisms leading to multiple dark matter components or a gradually decreasing small-scale power spectrum have to be considered.

    AB - Over the last decade, warm dark matter (WDM) has been repeatedly proposed as an alternative scenario to the standard cold dark matter (CDM) one, potentially resolving several disagreements between the CDM model and observations on small scales. Here, we reconsider the most important CDM small-scale discrepancies in the light of recent observational constraints on WDM. As a result, we find that a conventional thermal (or thermal-like) WDM cosmology with a particle mass in agreement with Lyman α is nearly indistinguishable from CDM on the relevant scales and therefore fails to alleviate any of the small-scale problems. The reason for this failure is that the power spectrum of conventional WDM falls offtoo rapidly. To maintain WDM as a significantly different alternative to CDM, more evolved production mechanisms leading to multiple dark matter components or a gradually decreasing small-scale power spectrum have to be considered.

    KW - Cosmology: Theory

    KW - Dark matter

    KW - Galaxies: Haloes

    UR - http://www.scopus.com/inward/record.url?scp=84899903992&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84899903992&partnerID=8YFLogxK

    U2 - 10.1093/mnrasl/slu034

    DO - 10.1093/mnrasl/slu034

    M3 - Article

    VL - 441

    JO - Monthly Notices of the Royal Astronomical Society: Letters

    JF - Monthly Notices of the Royal Astronomical Society: Letters

    SN - 1745-3925

    IS - 1

    M1 - slu034

    ER -