scholarly journals Unification and cogeneration of dark matter and baryonic matter

2012 ◽  
Vol 85 (1) ◽  
Author(s):  
S. M. Barr
Keyword(s):  
Dark Matter ◽  
Baryonic Matter

scholarly journals Understanding the large inferred Einstein radii of observed low-mass galaxy clusters

2020 ◽  
Vol 494 (4) ◽  
pp. 4706-4712 ◽  
Author(s):  
Andrew Robertson ◽  
Richard Massey ◽  
Vincent Eke
Keyword(s):  
Dark Matter ◽  
Galaxy Clusters ◽  
Gravitational Lensing ◽  
Cold Dark Matter ◽  
Baryonic Matter ◽  
Analysis Method ◽  
Critical Curves ◽  
Hydrodynamical Simulation ◽  
Low Mass ◽  
Main Effects

ABSTRACT We assess a claim that observed galaxy clusters with mass ${\sim}10^{14} \mathrm{\, M_\odot }$ are more centrally concentrated than predicted in lambda cold dark matter (ΛCDM). We generate mock strong gravitational lensing observations, taking the lenses from a cosmological hydrodynamical simulation, and analyse them in the same way as the real Universe. The observed and simulated lensing arcs are consistent with one another, with three main effects responsible for the previously claimed inconsistency. First, galaxy clusters containing baryonic matter have higher central densities than their counterparts simulated with only dark matter. Secondly, a sample of clusters selected because of the presence of pronounced gravitational lensing arcs preferentially finds centrally concentrated clusters with large Einstein radii. Thirdly, lensed arcs are usually straighter than critical curves, and the chosen image analysis method (fitting circles through the arcs) overestimates the Einstein radii. After accounting for these three effects, ΛCDM predicts that galaxy clusters should produce giant lensing arcs that match those in the observed Universe.

scholarly journals Dark Matter in the Universe

BIBECHANA ◽  
1970 ◽  
Vol 6 ◽  
pp. 27-30
Author(s):  
Devendra Adhikari ◽  
Krishna Raj Adhikari
Keyword(s):  
Dark Matter ◽  
Baryonic Matter ◽  
X Ray ◽  
Physical Phenomena ◽  
The Universe

Different physical phenomena, techniques, and evidences which give the proof for the existence of dark matter have been discussed. Keywords: Baryonic matter; dark matter; Chandra x-ray ObservatoryDOI: 10.3126/bibechana.v6i0.3936BIBECHANA Vol. 6, March 2010 pp.27-30

scholarly journals On The Symmetry of The Universe

2020 ◽  
Author(s):  
Engel Roza
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Thermodynamic Equilibrium ◽  
Vacuum Energy ◽  
Quantum Mechanical ◽  
Baryonic Matter ◽  
Time Uncertainty ◽  
Matter Effect ◽  
Mechanical Interpretation ◽  
The Universe

It is shown that the Lambda component in the cosmological Lambda-CDM model can be conceived as vacuum energy, consisting of gravitational particles subject to Heisenberg’s energy-time uncertainty. These particles can be modelled as elementary polarisable Dirac-type dipoles (“darks”) in a fluidal space at thermodynamic equilibrium, with spins that are subject to the Bekenstein-Hawking entropy. Around the baryonic kernels, uniformly distributed in the universe, the spins are polarized, thereby invoking an increase of the effective gravitational strength of the kernels. It explains the dark matter effect to the extent that the numerical value of Milgrom’s acceleration constant can be assessed by theory. Non-polarized vacuum particles beyond the baryonic kernels compose the dark energy. The result is a quantum mechanical interpretation of gravity in terms of quantitatively established shares in baryonic matter, dark matter and dark energy, which correspond with the values of the Lambda-CDM model..

scholarly journals Is there a dichotomy in the Dark Matter as well as in the Baryonic Matter properties of ellipticals?

2004 ◽  
Vol 220 ◽  
pp. 173-174
Author(s):  
N. R. Napolitano ◽  
M. Capaccioli ◽  
M. Arnaboldi ◽  
M. R. Merrifield ◽  
N. G. Douglas ◽  
...  
Keyword(s):  
Dark Matter ◽  
Structural Parameters ◽  
Matter Content ◽  
Baryonic Matter ◽  
Early Type

We have found a correlation between the M / L global gradients and the structural parameters of the luminous components of a sample of 19 early-type galaxies. Such a correlation supports the hypothesis that there is a connection between the dark matter content and the evolution of the baryonic component in such systems.

NONLINEAR EVOLUTION OF COSMIC BARYON FLUID

2012 ◽  
Vol 12 ◽  
pp. 120-130
Author(s):  
LI-ZHI FANG
Keyword(s):  
Dark Matter ◽  
Gravitational Field ◽  
Velocity Field ◽  
Nonlinear Evolution ◽  
Statistical Properties ◽  
Complex Structures ◽  
Baryonic Matter ◽  
Developed Turbulence ◽  
Highly Nonlinear ◽  
The Universe

Although the gravitational field in the universe is dominated by dark matter, observations show that the statistical properties of cosmic baryonic matter are significantly and systematically decoupled from that of the underlying dark matter. This is because the cosmic baryon fluid in highly nonlinear regime is in a state of fully developed turbulence, of which the velocity field consists of shocks, vortices and complex structures. This scenario provides a coherent explanation of various phenomena referring to the decoupling of the IGM from dark matter, including the log-Poisson non-Gaussianity of Ly-alpha transmitted flux fluctuations; turbulent broadening; abnormal scaling; baryon missing in halos etc.

scholarly journals Modified dark matter: Relating dark energy, dark matter and baryonic matter

2018 ◽  
Vol 27 (02) ◽  
pp. 1830001 ◽  
Author(s):  
Douglas Edmonds ◽  
Duncan Farrah ◽  
Djordje Minic ◽  
Y. Jack Ng ◽  
Tatsu Takeuchi
Keyword(s):  
Dark Matter ◽  
Accelerating Universe ◽  
Baryonic Matter ◽  
Positive Cosmological Constant ◽  
Critical Acceleration ◽  
Quantitative Studies ◽  
Cluster Data ◽  
Matter Detection ◽  
Gravitational Thermodynamics ◽  
Galaxy Rotation Curves

Modified dark matter (MDM) is a phenomenological model of dark matter, inspired by gravitational thermodynamics. For an accelerating universe with positive cosmological constant ([Formula: see text]), such phenomenological considerations lead to the emergence of a critical acceleration parameter related to [Formula: see text]. Such a critical acceleration is an effective phenomenological manifestation of MDM, and it is found in correlations between dark matter and baryonic matter in galaxy rotation curves. The resulting MDM mass profiles, which are sensitive to [Formula: see text], are consistent with observational data at both the galactic and cluster scales. In particular, the same critical acceleration appears both in the galactic and cluster data fits based on MDM. Furthermore, using some robust qualitative arguments, MDM appears to work well on cosmological scales, even though quantitative studies are still lacking. Finally, we comment on certain nonlocal aspects of the quanta of modified dark matter, which may lead to novel nonparticle phenomenology and which may explain why, so far, dark matter detection experiments have failed to detect dark matter particles.

scholarly journals Dark Matter in Groups and Clusters of Galaxies

2000 ◽  
Vol 174 ◽  
pp. 360-372 ◽  
Author(s):  
Jaan Einasto ◽  
Maret Einasto
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Dynamical Evolution ◽  
Constant Term ◽  
Stellar Populations ◽  
Clusters Of Galaxies ◽  
Baryonic Matter ◽  
Dark Matter Halos ◽  
Hot Gas ◽  
The Universe

AbstractWe compare the characteristics of stellar populations with those of dark halos. Dark matter around galaxies, and in groups, clusters and voids is discussed. Modern data suggest that the overall density of matter in the Universe is ΩM = 0.3 ± 0.1, about 80 % of this matter is nonbaryonic dark matter, and about 20 % is baryonic, mostly in the form of hot intra-cluster and intragroup gas, the rest in stellar populations of galaxies. All bright galaxies are surrounded by dark matter halos of external radii 200 − 300 kpc; halos consist mostly of non-baryonic matter with some mixture of hot gas. The Universe is dominated by dark energy (cosmological constant) term. Dark matter dominates in the dynamical evolution of galaxies in groups and clusters.

scholarly journals Scale-invariant dynamics of galaxies, MOND, dark matter, and the dwarf spheroidals

2019 ◽  
Vol 492 (2) ◽  
pp. 2698-2708 ◽  
Author(s):  
Andre Maeder ◽  
Vesselin G Gueorguiev
Keyword(s):  
Dark Matter ◽  
Gravitational Acceleration ◽  
Baryonic Matter ◽  
Scale Invariant ◽  
Radial Acceleration ◽  
Horizontal Asymptote ◽  
Dynamical Properties ◽  
Dwarf Spheroidals ◽  
Dynamics Of Galaxies ◽  
The Relationship

ABSTRACT The Scale-Invariant Vacuum (SIV) theory is based on Weyl’s Integrable Geometry, endowed with a gauge scalar field. The main difference between MOND and the SIV theory is that the first considers a global dilatation invariance of space and time, where the scale factor λ is a constant, while the second opens the likely possibility that λ is a function of time. The key equations of the SIV framework are used here to study the relationship between the Newtonian gravitational acceleration due to baryonic matter gbar and the observed kinematical acceleration gobs. The relationship is applied to galactic systems of the same age where the radial acceleration relation (RAR), between the gobs and gbar accelerations, can be compared with observational data. The SIV theory shows an excellent agreement with observations and with MOND for baryonic gravities gbar > 10−11.5 m s−2. Below this value, SIV still fully agrees with the observations, as well as with the horizontal asymptote of the RAR for dwarf spheroidals, while this is not the case for MOND. These results support the view that there is no need for dark matter and that the RAR and related dynamical properties of galaxies can be interpreted by a modification of gravitation.

scholarly journals Generating luminous and dark matter during inflation

2017 ◽  
Vol 32 (14) ◽  
pp. 1750087 ◽  
Author(s):  
Neil D. Barrie ◽  
Archil Kobakhidze
Keyword(s):  
Dark Matter ◽  
General Framework ◽  
Density Ratio ◽  
Baryon Asymmetry ◽  
Matter Density ◽  
Dark Matter Candidate ◽  
Baryonic Matter ◽  
Cosmic Inflation ◽  
The Standard Model ◽  
Chern Simons

We propose a new mechanism for generating both luminous and dark matter during cosmic inflation. According to this mechanism, ordinary and dark matter carry common charge which is associated with an anomalous U(1)[Formula: see text] group. Anomaly terms source [Formula: see text] and U(1)[Formula: see text] charge violating processes during inflation, producing corresponding nonzero Chern–Simons numbers which are subsequently reprocessed into baryon and dark matter densities. The general framework developed is then applied to two possible extensions of the Standard Model with anomalous gauged [Formula: see text] and [Formula: see text], each with an additional dark matter candidate. In each scenario, we consider the parameter choices that predict the correct dark matter to baryonic matter density ratio and baryon asymmetry. Interestingly, under these conditions, for the U(1)[Formula: see text] extension we obtain a prediction for the mass of the dark matter candidate which is independent of the other choice of parameters, when assuming an [Formula: see text] and [Formula: see text].

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