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Research papers on The search for dark matter

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  1. Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant

    Adam G. Riess, A. V. Filippenko, P. Challis, et al. · 1998 · The Astronomical Journal · 19,727 citations

    We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 ≤ z ≤ 0.62. The luminosity distances of these objects are determined by methods that employ relations between SN Ia luminosity and light curve shape. Combined with previous data from our High- z Supernova Search Team and recent results by Riess et al., this expanded set of 16 high-redshift supernovae and a set of 34 nearby supernovae are used to place constraints on the following cosmological parameters: the Hubble constant ( H 0 ), the mass density (Ω M ), the cosmological constant (i.e., the vacuum energy density, Ω Λ ), the deceleration parameter ( q 0 ), and the dynamical age of

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  2. SEVEN-YEARWILKINSON MICROWAVE ANISOTROPY PROBE(WMAP) OBSERVATIONS: COSMOLOGICAL INTERPRETATION

    Eiichiro Komatsu, Kendrick M. Smith, J. Dunkley, et al. · 2011 · The Astrophysical Journal Supplement Series · 8,887 citations

    SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP*) OBSERVATIONS: COSMOLOGICAL INTERPRETATION, E. Komatsu, K. M. Smith, J. Dunkley, C. L. Bennett, B. Gold, G. Hinshaw, N. Jarosik, D. Larson, M. R. Nolta, L. Page, D. N. Spergel, M. Halpern, R. S. Hill, A. Kogut, M. Limon, S. S. Meyer, N. Odegard, G. S. Tucker, J. L. Weiland, E. Wollack, E. L. Wright

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  3. Three‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Implications for Cosmology

    David N. Spergel, Rachel Bean, Olivier Doré, et al. · 2007 · The Astrophysical Journal Supplement Series · 6,672 citations

    A simple cosmological model with only six parameters (matter density, Ω m h 2 , baryon density, Ω b h 2 , Hubble constant, H 0 , amplitude of fluctuations, σ 8 , optical depth, τ, and a slope for the scalar perturbation spectrum, n s ) fits not only the 3 year WMAP temperature and polarization data, but also small-scale CMB data, light element abundances, large-scale structure observations, and the supernova luminosity/distance relationship. Using WMAP data only, the best-fit values for cosmological parameters for the power-law flat Λ cold dark matter (ΛCDM) model are (Ω m h 2 ,Ω b h 2 , h , n s ,τ,σ 8 ) = (0.1277 ,0.02229 ± 0.00073,0.732 ,0.958 ± 0.016,0.089 ± 0.030,0.761 ). The 3 year data

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  4. Planck 2013 results. XVI. Cosmological parameters

    P. A. R. Ade, N. Aghanim, C. Armitage-Caplan, et al. · 2014 · Astronomy and Astrophysics · 6,595 citations

    This paper presents the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra. We find that the Planck spectra at high multipoles ( > 40) are extremely well described by the standard spatiallyflat six-parameter CDM cosmology with a power-law spectrum of adiabatic scalar perturbations. Within the context of this cosmology, the Planck data determine the cosmological parameters to high precision: the angular size of the sound horizon at recombination, the physical densities of baryons and cold dark matter, and the scalar spectral index are estimated to be * = (1.04147 0.00062) 10 -2 , b h 2 = 0.02205 0.00

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  5. FIVE-YEARWILKINSON MICROWAVE ANISOTROPY PROBEOBSERVATIONS: COSMOLOGICAL INTERPRETATION

    Eiichiro Komatsu, J. Dunkley, Michael R. Nolta, et al. · 2009 · The Astrophysical Journal Supplement Series · 5,736 citations

    The Wilkinson Microwave Anisotropy Probe ( WMAP ) 5-year data provide stringent limits on deviations from the minimal, six-parameter Λ cold dark matter model. We report these limits and use them to constrain the physics of cosmic inflation via Gaussianity, adiabaticity, the power spectrum of primordial fluctuations, gravitational waves, and spatial curvature. We also constrain models of dark energy via its equation of state, parity-violating interaction, and neutrino properties, such as mass and the number of species. We detect no convincing deviations from the minimal model. The six parameters and the corresponding 68% uncertainties, derived from the WMAP data combined with the distance mea

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  6. The cosmological constant and dark energy

    P. J. E. Peebles, Bharat Ratra · 2003 · Reviews of Modern Physics · 5,305 citations

    Physics welcomes the idea that space contains energy whose gravitational effect approximates that of Einstein's cosmological constant, \ensuremath{\Lambda}; today the concept is termed dark energy or quintessence. Physics also suggests that dark energy could be dynamical, allowing for the arguably appealing picture of an evolving dark-energy density approaching its natural value, zero, and small now because the expanding universe is old. This would alleviate the classical problem of the curious energy scale of a millielectron volt associated with a constant \ensuremath{\Lambda}. Dark energy may have been detected by recent cosmological tests. These tests make a good scientific case for the c

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  7. NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTS

    G. Hinshaw, D. Larson, E. Komatsu, et al. · 2013 · The Astrophysical Journal Supplement Series · 5,147 citations

    We present cosmological parameter constraints based on the final nine-year Wilkinson Microwave Anisotropy Probe ( WMAP ) data, in conjunction with a number of additional cosmological data sets. The WMAP data alone, and in combination, continue to be remarkably well fit by a six-parameter ΛCDM model. When WMAP data are combined with measurements of the high- l cosmic microwave background anisotropy, the baryon acoustic oscillation scale, and the Hubble constant, the matter and energy densities, Ω b h 2 , Ω c h 2 , and Ω Λ , are each determined to a precision of ∼1.5%. The amplitude of the primordial spectrum is measured to within 3%, and there is now evidence for a tilt in the primordial spec

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  10. Ultralight scalars as cosmological dark matter

    Lam Hui, Jeremiah P. Ostriker, Scott Tremaine, et al. · 2017 · Physical review. D/Physical review. D. · 1,743 citations

    Many aspects of the large-scale structure of the Universe can be described successfully using cosmological models in which $27\ifmmode\pm\else\textpm\fi{}1%$ of the critical mass-energy density consists of cold dark matter (CDM). However, few---if any---of the predictions of CDM models have been successful on scales of $\ensuremath{\sim}10\text{ }\text{ }\mathrm{kpc}$ or less. This lack of success is usually explained by the difficulty of modeling baryonic physics (star formation, supernova and black-hole feedback, etc.). An intriguing alternative to CDM is that the dark matter is an extremely light ($m\ensuremath{\sim}{10}^{\ensuremath{-}22}\text{ }\text{ }\mathrm{eV}$) boson having a de Br

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  11. Non-baryonic dark matter: observational evidence and detection methods

    Lars Bergström · 2000 · Reports on Progress in Physics · 918 citations

    The evidence for the existence of dark matter in the universe is reviewed. A general picture emerges, where both baryonic and non-baryonic dark matter is needed to explain current observations. In particular, a wealth of observational information points to the existence of a non-baryonic component, contributing between around 20 and 40% of the critical mass density needed to make the universe geometrically flat on large scales. In addition, an even larger contribution from vacuum energy (or cosmological constant) is indicated by recent observations. To the theoretically favoured particle candidates for non-baryonic dark matter belong axions, supersymmetric particles, and of less importance,

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  18. Directional direct detection of MeV scale boosted dark matter in two component dark matter scenario via dark photon interaction

    Keiko I. Nagao, Tatsuhiro Naka, Takaaki Nomura · 2025 · Journal of Cosmology and Astroparticle Physics · 2 citations

    Abstract This study explores a two-component dark matter model in which one component, heavier dark matter, annihilates into a lighter dark matter. The lighter dark matter is expected to generate detectable signals in detectors due to its enhanced momentum, enabling direct detection even for MeV-scale dark matter. We investigate the effectiveness of directional direct detections, especially the nuclear emulsion detector NEWSdm, in verifying these boosted dark matter particles through nuclear recoil. In particular, we focus on light nuclei, such as protons and carbon, as suitable targets for this detection method due to their high sensitivity to MeV-scale dark matter. By modeli

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  21. Non-spherical dark matter structures detection

    Nicolas Loizeau, Glennys R. Farrar · 2022 · Journal of Cosmology and Astroparticle Physics · 1 citations

    Abstract A rotation curve inequality that holds for spherically symmetric mass distributions is derived, and tested against the SPARC galaxy rotation curves dataset. We identify several Galaxies, e.g. NGC7793 and UGC11557, which are candidates for hosting non-spherical dark matter structures that could be detected by more precise measurements.

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  23. Inhomogeneous cosmology with space-varying dark energy and dark matter profiles

    D. Comelli · 2025 · Journal of Cosmology and Astroparticle Physics

    Abstract We analyse an inhomogeneous cosmological model featuring a spherically symmetric bubble solution induced by a unified single perfect fluid, comprising spatially dependent Dark Energy (with w = -1) and Dark Matter (with w = 0) components. We impose an Hubble profile that matches the Planck value at early times (h 0 = 67.4 ± 0.5 Km/s Mpc) and the local value (ℋ0 = 73.52 ± 1.62 Km/s Mpc). We explicitly derive perturbative solutions in two distinct regimes: one expanded around the center (for small r ℋ0 ≪ 1) and the other expanded around a homogeneous FRW universe. In both cases, we compute the cosmographic parameters,

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