Dark matter halos in the multicomponent model. Substructure and density profiles of galactic halos

ORAL

Abstract

Multicomponent dark matter with inter-conversions of mass eigenstates into one another is known to successfully and simultaneously resolve $\Lambda$CDM problems at galactic and sub-galactic scales. Here, we present $N$-body simulations of the simplest two-component (2cDM) model with large set of velocity-dependent cross-sections, $\sigma(v)\propto v^{a}$, and compare them with observational data. They show that the 2cDM paradigm with the self-interaction cross-sections $0.01\le \sigma_0/m\le 1$~cm$^2$g$^{-1}$ and the mass degeneracy $\Delta m/m\sim 10^{-7}-10^{-8}$ robustly resolves the substructure and too-big-to-fail problems by suppressing the substructure with $V_{\rm circ,max} \lesssim100$~km~s$^{-1}$. Furthermore, 2cDM robustly suppresses central cusps in dwarf halos with $M \sim 4-5 \times10^{11} M_{\odot}$, thus resolving the core-cusp problem as well. The core radii are controlled by $\sigma_0/m$ and the DM cross-section's velocity-dependent power-law indices $(a_s,a_c)$, but are largely insensitive to the species' mass degeneracy. Next, there is disagreement between the radial distribution of dwarfs in a host halo observed in the Local Group and simulated with CDM, which poses one more small-scale problem to CDM, which is alleviated by 2cDM.

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Authors

  • Keita Todoroki

    KU, MIT, MIT, KU

  • Michael Schmitt

    Old Dominion University, Thomas Jefferson National Accelerator Facility, KAIST , CAPP/IBS, CAPP/IBS, New Mexico State University, Goddard Space Flight Center, Caltech, Cornell University, Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy Northwestern University, Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Perimeter Institute for Theoretical Physics, Max Planck Institute for Gravitational Physics (Albert Einstein Institute), University of Ottawa, Northwestern University, Universitat Autonoma de Barcelona, Chinesse Academy of Sciences, Zentrum fur Astronomie und Astrophysik, TechSource Inc., Purdue Univ, KAIST, CAPP/IBS, CAPP, IBS, IBS/CAPP, KAIST, KAIST, IBS/CAPP, Cal Poly, Ohio State University, Kenyon College, Embry-Riddle (Prescott), Univ of California - Berkeley, Lawrence Berkeley Natl Lab, Univ of Toronto, Montana State University, NASA Marshall Space Flight Center, Heidelberger Institut für Theoretische Studien, Georgia Institute of Technology, Canadian Institute for Theoretical Astrophysics, Universit\'a di Parma, Istituto Nazionale di Fisica Nucleare, University of Mount Union, Univ of Florida - Gainesville, DESY, Vinca Institute, University of Belgrade, Fermilab, Ohio State Univ - Columbus, Indiana Univ - Bloomington, FUZZYICS, Interactive Research Institute for Science and Education, Western Michigan University, West Virginia University, Morgantown, Marshall University, Huntington, Jordan University of Science and Technology, Instituto de Fisica, Universidade de Sao Paulo, Departamento de Ciencias da Natureza, Matematica e Educacao, Universidade Federal de Sao Carlos, UVA, University of Virginia, Brown University, Central Michigan University, U. S. Army Research Laboratory, U. S. Army Research Laboratory/ORAU, The Australian National University, Air Force Institute of Tech - WPAFB, IMPU, Pennsylvania State University, Pennsylvania State Univ, University of North Carolina Chapel Hill, University of California, Berkeley, Princeton University, Michigan State University, North Carolina State University, University of Manitoba, University of Notre Dame, Argonne National Laboratory/University of Chicago, Argonne National Laboratory/University of Manitoba, McGill University, Ohio University, Technical University Dortmund, Czech Technical University, Lancaster University, University of Tennessee, Tennessee Technical University, Max-Planck Institute, Oak Ridge National Lab, South Dakota School of Mines and Technology, Univ of South Carolina, Stanford University, Univ of Wisconsin, Madison, Harvard, Universidade do Estado do Rio de Janeiro, Universitat de les Illes Balears, Long Island University, Brigham Young University, Radboud University, University College Dublin, Louisiana State University, University of Chicago, University of California, Irvine, Soreq NRC, Yavne 81800, Israel, Lawrence Livermore National Laboratory, Argonne National Laboratory, University of Chicago, Argonne National Laboratory, University of Kentucky, Retired, Lawrence Livermore National Laboratory L-414, Livermore, CA 94551, USA, California State University, University of Illinois, Urbana-Champaign, University of Texas at San Antonio, California Institute of Technology, Vanderbilt University and Fisk University, Instituto de Astronomy UNAM, CIERA and NorthWestern University, Hillsdale College, Spitzer Science Center, California Institute of Technology, Jet Propulsion Laboratory, California Institute of Technology, Oberlin College, West Virginia University, National Radio Astronomy Observatory, KU, MIT, LANL, Univ. of Chicago, Leiden University, Albert Einstein Institute, University of Amsterdam, Montana State Univ, CIERA-Northwestern University, MIT, Rochester Inst of Tech, Princeton University, Institute for Advanced Study, None, Department of Physics, Florida State University, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA, Department of Physics, Florida A\&M University, University of Florida, Gainesville, Washington Univ, Los Alamos Natl Lab, Shahid Beheshti University Tehran Iran, NIST, U. Waterloo, Tulane U., NCState, Institute for Quantum Computing, RIKEN, Nagoya Univ, Tulane Univ, North Carolina State Univ, The University of Manitoba, Jefferson Laboratory, Yerevan Physics Institute, North Carolina Central University, Massachusetts Inst of Tech-MIT, Tel Aviv University, International Institute of Physics - UFRN, University of Houston, Rutgers University, University of Sao Paulo, UC Berkeley, UMass Amherst, Indian Institute of Technology, University of Michigan - Ann Arbor, Max Planck Institute, Hannover, INAF Padova, Univ of Pisa, Univ of Trento, Hampton University, University of South Carolina, Ohio Univ, Ohio University, CLAS Collaboration, Lamar University, University of Texas, Rio Grande Valley, Franklin and Marshall College, NASA/GSFC, NASA/GSFC & CRESST, University of Arkansas, University of Utah, Johns Hopkins University, Universidad de la Republica, Uruguay, Department of Physics, Missouri University of Science and Technology, Rolla, MO, 65409, University of Glasgow, GANIL, Dept. of Chemistry and Physics, Washington University, St. Louis MO 63130, Facility for Rare Isotope Beams (FRIB), Michigan State University, East Lansing MI 48824, National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing MI 48824, Lawrence Berkeley Laboratory, Washington University, U Minnesota, NASA/GSFC $\&$ CRESST, Washington University, St. Louis, University of Minnesota, Jet Propulsion Laboratory, NASA Goddard Space Flight Center, Jet Propulsion Laboratory, Pasadena, California Institute of Technology, NASA/Goddard Space Flight Center, Indian Institute of Science Education and Research, Kolkata, Sapienza University Rome, Institut d'Astrophysique de Paris, University of Mississippi, Instituto Superior Tecnico, Lisbon, Albert Einstein Institute Golm, Salisbury U., Ohio State U., Ohio U., Ernst-Moritz-Arndt-Universit\"at, National Superconducting Cyclotron Laboratory, Facility for Rare Isotope Beams, UW-Madison, Eureka Scientific, Cambridge University, Wayne State University, Indian Institute of Technology, Indore, Michigan State Univ, Binghamton Univ, Youngstown State Univ, Institute of Physics, Czech Academy of Sciences, Boyce Research Initiatives and Educational Foundation, Brilliant Sky Observatory, San Diego Mesa College, Indiana Univ, Columbia University, UCLA, Univ. of Kentucky, Air Force Research Lab., Argonne Nat'l Lab., Michigan State Univ., Michigan State University, USA, TRIUMF, Canada, Technische Universitat Munchen, Germany, Institut Laue-Langevin, France, Physikalisch-Technische Bundenstalt, Germany, Julich Centre for Neutron Science, Germany, University of Michigan, USA, Syracuse University, Syracuse, Center for Astrophysics and Planetary Science, Cornell University, Budapest Neutron Centre, Defense Threat Reduction Agency, Osaka University, University of Groningen, University of Tokyo, Kyoto University, Tohoku University, Konan University, Ankara University, University of Michigan, Lawrence Berkeley National Laboratory, Univ of Washington, Aichi University of Education, eXtreme Gravity Institute - Montana State University, The Ohio State University, Universidade Federal Fluminese, Brookhaven National Laboratory, Frankfurt Institute of Advanced Studies, Duke University, Univ of Texas, Arlington, Magdalena Ridge Observatory, New Mexico Tech, Florida State Univ, Univ of Maryland-College Park, Univ of Cincinnati, Radboud University Nijmegen, University of Pisa, ICTS-TIFR, AEI, Hannover, University of Connecticut, Storrs, ANL, Louisiana State University - Baton Rouge, Brigham Young University - Idaho, Fermi National Accelerator Lab, University of Colorado Boulder, Northwestern Univ