Status of Dark Matter in the Universe

Abstract

Over the past few decades, a consensus picture has emerged in which roughly a quarter of the universe consists of dark matter. I begin with a review of the observational evidence for the existence of dark matter: rotation curves of galaxies, gravitational lensing measurements, hot gas in clusters, galaxy formation, primordial nucleosynthesis and cosmic microwave background observations. Then I discuss a number of anomalous signals in a variety of data sets that may point to discovery, though all of them are controversial. The annual modulation in the DAMA detector and/or the gamma-ray excess seen in the Fermi Gamma Ray Space Telescope from the Galactic Center could be due to WIMPs; a 3.5 keV X-ray line from multiple sources could be due to sterile neutrinos; or the 511 keV line in INTEGRAL data could be due to MeV dark matter. All of these would require further confirmation in other experiments or data sets to be proven correct. In addition, a new line of research on dark stars is presented, which suggests that the first stars to exist in the universe were powered by dark matter heating rather than by fusion: the observational possibility of discovering dark matter in this way is discussed.

Proceedings of 14th Marcel Grossman Meeting, MG14, University of Rome "La Sapienza", Rome, July 2015

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Cited by in corpus (52)

• Testing General Relativity in Cosmology
• The distribution of dark matter in galaxies
• Physical Bayesian modelling of the non-linear matter distribution: new insights into the Nearby Universe
• Bouncing cosmological solutions from f(R,T) gravity
• Probing Primordial-Black-Hole Dark Matter with Gravitational Waves
• IMAGINE: A comprehensive view of the interstellar medium, Galactic magnetic fields and cosmic rays
• Einstein, Planck and Vera Rubin: relevant encounters between the Cosmological and the Quantum Worlds
• Constraints on Spin-Dependent Dark Matter Scattering with Long-Lived Mediators from TeV Observations of the Sun with HAWC
• Cosmological direct detection of dark energy: non-linear structure formation signatures of dark energy scattering with visible matter
• Search for GeV-scale Dark Matter Annihilation in the Sun with IceCube DeepCore
• Sensitivity of the COHERENT Experiment to Accelerator-Produced Dark Matter
• A model for a dark matter core at the galactic center
• Neutron Disappearance and Regeneration from Mirror State
• Characterization of Population III Stars with Stellar Atmosphere and Evolutionary Modeling and Predictions of their Observability with the James Webb Space Telescope
• Bounds on Ultra-Light Hidden-Photon Dark Matter from 21cm at Cosmic Dawn
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• Shining Primordial Black Holes
• Multicomponent multiscatter capture of Dark Matter
• Forbidden dark matter annihilation into leptons with full collision terms
• The Quest for the Nature of the Dark Matter: The Need of a New Paradigm
• Mixed Warm Dark Matter Constraints using Milky Way Satellite Galaxy Counts
• MOND as the weak field limit of an extended metric theory of gravity with a matter-curvature coupling
• Dark matter candidate with well-defined mass and couplings
• Born-Infeld gravity with a Brans-Dicke scalar
• Neutron Star Structure in Hořava-Lifshitz Gravity
• Multiscatter capture of superheavy dark matter by Pop. III stars
• Piercing of a solitonic boson star by a black hole
• First Search for Ultralight Dark Matter Using a Magnetically Levitated Particle
• Testing emergent gravity with mass densities of galaxy clusters
• The proper motion of stars in dwarf galaxies: distinguishing central density cusps from cores
• Dark Matter-admixed Rotating White Dwarfs as Peculiar Compact Objects
• Quasilocal Newtonian limit of general relativity and galactic dynamics
• Rescuing The Primordial Black Holes all-Dark Matter Hypothesis from The Fast Radio Bursts Tension
• Dark Spin-2 Field Solitons as a Source of Electromagnetic Radiation
• The maximum mass of dark matter existing in compact stars based on the self-interacting fermionic model
• Inflation in Symmergent Metric-Palatini Gravity
• Direct signals from electroweak singlets through the Higgs portal
• Proposal for a degree of scientificity in cosmology
• Radiative corrections to stop-antistop annihilation into gluons and light quarks
• Gravitational frequency shift of light signals in a pulsating dark matter halo
• Dark matter, supernova neutrinos and other backgrounds in direct dark matter searches. The ANDES laboratory prospects
• Dark Matter Internal Pair Production -- A Novel Direct Detection Mechanism
• Gamma Lines and Dark Matter from Anomaly Cancellation
• MSSM WIMPs-nucleon cross section for E${}_{\chi }<$ 500 GeV
• Supermassive Dark Stars and their remnants as a possible solution to three recent cosmic dawn puzzles
• Mass fluctuations and absorption rates in Dirac materials sensors
• Effects of non-vanishing dark matter pressure in the Milky Way galaxy
• The two-component virial theorem and the acceleration-discrepancy relation
• Ultralight axion or axion-like particle dark matter and 21-cm absorption signals in new physics
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