3 years ago

Dark Energy Survey Year 1 Results: A Precise H0 Measurement from DES Y1, BAO, and D/H Data.

K. Bechtol, T. M. Crawford, A. R. Liddle, D. W. Gerdes, T. Giannantonio, J. Frieman, C. Davis, H. Lin, O. Lahav, D. J. James, J. Carretero, G. M. Bernstein, M. W. G. Johnson, M. D. Johnson, B. A. Benson, J. Garcia-Bellido, T. M. C. Abbott, G. Gutierrez, M. March, C. E. Cunha, B. Jain, J. P. Dietrich, F. J. Castander, E. Fernandez, E. Gaztanaga, L. N. da Costa, T. Jeltema, H. T. Diehl, A. Drlica-Wagner, C. L. Chang, J. Annis, M. A. G. Maia, A. E. Evrard, P. Doel, S. Desai, C. B. D'Andrea, A. Manzotti, M. Lima, J. W. Henning, S. Kuhlmann, B. Hoyle, R. A. Gruendl, A. Carnero Rosell, K. Kuehn, K. Honscheid, W. G. Hartley, D. Gruen, B. Flaugher, DES Collaboration, M. Jarvis, D. Brooks, D. L. Burke, E. Bertin, N. Kuropatkin, J. Gschwend, M. Carrasco Kind, F. B. Abdalla, E. Krause, R. A. Bernstein

We combine Dark Energy Survey Year 1 clustering and weak lensing data with Baryon Acoustic Oscillations (BAO) and Big Bang Nucleosynthesis (BBN) experiments to constrain the Hubble constant. Assuming a flat $\Lambda$CDM model with minimal neutrino mass ($\sum m_\nu = 0.06$ eV) we find $H_0=67.2^{+1.2}_{-1.0}$ km/s/Mpc (68% CL). This result is completely independent of Hubble constant measurements based on the distance ladder, Cosmic Microwave Background (CMB) anisotropies (both temperature and polarization), and strong lensing constraints. There are now five data sets that: a) have no shared observational systematics; and b) each constrain the Hubble constant with a few percent level precision. We compare these five independent measurements, and find that, as a set, the differences between them are significant at the $2.1\sigma$ level ($\chi^2/dof=20.1/11$, probability to exceed=4%). This difference is low enough that we consider the data sets statistically consistent with each other. The best fit Hubble constant obtained by combining all five data sets is $H_0 = 69.1^{+0.4}_{-0.6}$ km/s/Mpc.

Publisher URL: http://arxiv.org/abs/1711.00403

DOI: arXiv:1711.00403v1

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.