2024-10-30 ミシガン大学
JWST NIRCam imaging of star-forming protocluster PHz G191.24+62.04, 11 billion years ago as the universe was approaching the peak of star formation. These early galaxies are among the most active star-forming galaxies observed between 10.5 and 11.5 billion years ago. Each galaxy seen in this image is therefore producing many black holes, which are converting matter into dark energy according to the cosmologically coupled black hole hypothesis. This image shows the two “modules” of JWST NIRCam: The leftmost module contains the protocluster, and the rightmost module is an adjacent blank field. Each module sees thousands of galaxies. Image credit: NASA, ESA, CSA, Maria Polletta (INAF), Hervé Dole (Paris), Brenda Frye (UofA), Jordan C. J. D’Silva (UWA), Anton M. Koekemoer (STScI), Jake Summers (ASU), Rogier Windhorst (ASU)
＜関連情報＞
- https://news.umich.edu/evidence-mounts-for-dark-energy-from-black-holes/
- https://news.umich.edu/evidence-mounts-for-dark-energy-from-black-holes/
DESI暗黒エネルギーの時間発展は宇宙論的に結合したブラックホールによって回復される DESI dark energy time evolution is recovered by cosmologically coupled black holes
Kevin S. Croker, Gregory Tarlé, Steve P. Ahlen, Brian G. Cartwright, Duncan Farrah, Nicolas Fernandez and Rogier A. Windhorst
Journal of Cosmology and Astroparticle Physics Published: 28 October 2024
DOI:10.1088/1475-7516/2024/10/094
Abstract
Recent baryon acoustic oscillation (BAO) measurements by the Dark Energy Spectroscopic Instrument (DESI) provide evidence that dark energy (DE) evolves with time, as parameterized by a w0wa equation of state. Cosmologically coupled black holes (BHs) provide a DE source that naturally evolves with time, because BH production tracks cosmic star-formation. Using DESI BAO measurements and priors informed by Big Bang Nucleosynthesis, we measure the fraction of baryonic density converted into BHs, assuming that all DE is sourced by BH production. We find that the best-fit DE density tracks each DESI best-fit w0wa model within 1σ, except at redshifts z ≲ 0.2, highlighting limitations of the w0wa parameterization. Cosmologically coupled BHs produce H0 = (69.94 ± 0.81) km s-1 Mpc-1, with the same χ2 as ΛCDM, and with two fewer parameters than w0wa. This value reduces tension with SH0ES to 2.7σ and is in excellent agreement with recent measurements from the Chicago-Carnegie Hubble Program. Because cosmologically coupled BH production depletes the baryon density established by primordial nucleosynthesis, these BHs provide a physical explanation for the “missing baryon problem” and the anomalously low sum of neutrino masses preferred by DESI. The global evolution of DE is an orthogonal probe of cosmological coupling, complementing constraints on BH mass-growth from elliptical galaxies, stellar binaries, globular clusters, the LIGO-Virgo-KAGRA merging population, and X-ray binaries. A DE density that correlates with cosmic star-formation: 1) is a natural outcome of cosmological coupling in BH populations; 2) eases tension between early and late-time cosmological probes; and 3) produces time-evolution toward a late-time ΛCDM cosmology different from Cosmic Microwave Background projections.
