Oliver Thewalt

    Oliver Thewalt

    Theoretical Physics | Quantum Biology | Dark Matter Research | Energy Consulting | Creation of Hydrogen ATOM in the Higgs Field >> Vote for Nobel Prize

    The local dark matter density from SDSS-SEGUE G-dwarfs

    https://academic.oup.com/mnras/article-abstract/478/2/1677/4980949?redirectedFrom=fulltext

    We derive the local dark matter density by applying the integrated Jeans equation method from Silverwood et al. to SDSS-SEGUE G-dwarf data processed and presented by Büdenbender et al. We use the MULTINEST Bayesian nested sampling software to fit a model for the baryon distribution, dark matter, and tracer stars, including a model for the ‘tilt term’ that couples the vertical and radial motions, to the data. The α-young population from Büdenbender et al. yields the most reliable result of ρdm=0.46+0.07−0.08GeVcm−3=0.012+0.002−0.002M⊙pc−3⁠. Our analyses yield inconsistent results for the α-young and α-old data, pointing to problems in the tilt term and its modelling, the data itself, the assumption of a flat rotation curve, or the effects of disequilibria.