CURRENT STATUS OF MODERN DARK MATTER PROBLEM

2002 ◽  
Vol 17 (29) ◽  
pp. 4251-4260 ◽  
Author(s):  
YU. N. GNEDIN
Keyword(s):  
Dark Matter ◽  
Coupling Constants ◽  
Current Status ◽  
Ordinary Matter ◽  
Experimental Search ◽  
Hadronic Axion ◽  
Axion Decay

The basic methods of searching for dark matter candidates are discussed. The main topics of this talk are: (a) ground - based cavity experiments with searching for galactic axions; (b) searching for hadronic axion decay line into galactic and extragalactic light; (c) experimental search for solar and stellar axions; (d) basic methods of searching for WIMPs as candidates into dark matter; (e) limits on axion and WIMP masses and their coupling constants to photons and ordinary matter; (f) novels of searching for nonbaryonic dark matter.

Test of the equivalence principle for ordinary matter falling toward dark matter

1993 ◽  
Vol 70 (2) ◽  
pp. 123-126 ◽  
Author(s):  
G. Smith ◽  
E. G. Adelberger ◽  
B. R. Heckel ◽  
Y. Su
Keyword(s):  
Dark Matter ◽  
Equivalence Principle ◽  
Ordinary Matter

scholarly journals Neutron stars as probes of dark matter

2020 ◽  
Vol 29 (14) ◽  
pp. 2043028
Author(s):  
M. Ángeles Pérez-García ◽  
Joseph Silk
Keyword(s):  
General Relativity ◽  
Dark Matter ◽  
Equation Of State ◽  
Neutron Stars ◽  
Internal Structure ◽  
Stellar Objects ◽  
Ordinary Matter ◽  
Stable Solutions ◽  
The Universe

Neutron Stars (NSs) are compact stellar objects that are stable solutions in General Relativity. Their internal structure is usually described using an equation of state that involves the presence of ordinary matter and its interactions. However there is now a large consensus that an elusive sector of matter in the universe, described as dark matter, remains as yet undiscovered. In such a case, NSs should contain both, baryonic and dark matter. We argue that depending on the nature of the dark matter and in certain circumstances, the two matter components would form a mixture inside NSs that could trigger further changes, some of them observable. The very existence of NSs constrains the nature and interactions of dark matter in the universe.

scholarly journals THE DARK-MATTER WORLD: ARE THERE DARK-MATTER GALAXIES?

2012 ◽  
Vol 10 ◽  
pp. 1-12
Author(s):  
W-Y. PAUCHY HWANG
Keyword(s):  
Dark Matter ◽  
Time Span ◽  
Neutrino Masses ◽  
Ordinary Matter ◽  
Cosmic Neutrino Background ◽  
Cosmic Neutrino ◽  
Neutrino Background

We attempt to answer whether neutrinos and antineutrinos, such as those in the cosmic neutrino background, would clusterize among themselves or even with other dark-matter particles, under certain time span, say 1 Gyr. With neutrino masses in place, the similarity with the ordinary matter increases and so is our confidence for neutrino clustering if time is long enough. In particular, the clusterings could happen with some seeds (cf. see the text for definition), the chance in the dark-matter world to form dark-matter galaxies increases. If the dark-matter galaxies would exist in a time span of 1 Gyr, then they might even dictate the formation of the ordinary galaxies (i.e. the dark-matter galaxies get formed first); thus, the implications for the structure of our Universe would be tremendous.

scholarly journals Review of LHC dark matter searches

2017 ◽  
Vol 32 (13) ◽  
pp. 1730006 ◽  
Author(s):  
Felix Kahlhoefer
Keyword(s):  
Dark Matter ◽  
Experimental Search ◽  
Theoretical Approaches ◽  
Different Types

This review discusses both experimental and theoretical aspects of searches for dark matter at the LHC. An overview of the various experimental search channels is given, followed by a summary of the different theoretical approaches for predicting dark matter signals. A special emphasis is placed on the interplay between LHC dark matter searches and other kinds of dark matter experiments, as well as among different types of LHC searches.

scholarly journals Observational Physics of Mirror World

1999 ◽  
Vol 183 ◽  
pp. 309-309
Author(s):  
N.G. Bochkarev ◽  
M. Yu. Khlopov
Keyword(s):  
Dark Matter ◽  
Mirror Symmetry ◽  
Coordinate Systems ◽  
Ordinary Matter ◽  
Left And Right

Mirror (shadow) particles are required to restore symmetry between left- and right-handed coordinate systems. If mirror world exists, it has been born at the same time as the ordinary world and has the same evolution (in the case of the shadow world - broken mirror symmetry, the evolution and structure of the shadow world does not correspond with the observed world). Mirror world is a kind of dark matter. According to Bahcall (1984) local dark matter has a density approximately equal to the density of observed (ordinary) matter.

scholarly journals Status of the PADME experiment and review of dark photon searches

2018 ◽  
Vol 179 ◽  
pp. 01020 ◽  
Author(s):  
M. Raggi
Keyword(s):  
Dark Matter ◽  
Particle Physics ◽  
High Sensitivity ◽  
Low Energy ◽  
Current Status ◽  
Dark Photon

While accelerator particle physics has traditionally focused on exploring dark matter through highenergy experiments, testing dark-sectors hypothesis requires innovative low energy experiments that use highintensity beams and high-sensitivity detectors. In this scenario attractive opportunities are offered to low energy machines and flavour experiments. In this paper we will focus our attention on the Dark Photon (DP) scenario, reviewing the current status of searches and new opportunities with particular attention to the PADME experiment at Laboratori Nazionali di Frascati.

scholarly journals Star Formation and Gas Dynamics in Galactic Disks: Physical Processes and Numerical Models

2010 ◽  
Vol 6 (S270) ◽  
pp. 467-474 ◽  
Author(s):  
Eve C. Ostriker
Keyword(s):  
Dark Matter ◽  
Star Formation ◽  
Cooling Rate ◽  
Equilibrium Model ◽  
Star Formation Rate ◽  
Numerical Models ◽  
Formation Rate ◽  
Volume Density ◽  
Current Status ◽  
Vertical Gravity

AbstractStar formation depends on the available gaseous “fuel” as well as galactic environment, with higher specific star formation rates where gas is predominantly molecular and where stellar (and dark matter) densities are higher. The partition of gas into different thermal components must itself depend on the star formation rate, since a steady state distribution requires a balance between heating (largely from stellar UV for the atomic component) and cooling. In this presentation, I discuss a simple thermal and dynamical equilibrium model for the star formation rate in disk galaxies, where the basic inputs are the total surface density of gas and the volume density of stars and dark matter, averaged over ~kpc scales. Galactic environment is important because the vertical gravity of the stars and dark matter compress gas toward the midplane, helping to establish the pressure, and hence the cooling rate. In equilibrium, the star formation rate must evolve until the gas heating rate is high enough to balance this cooling rate and maintain the pressure imposed by the local gravitational field. In addition to discussing the formulation of this equilibrium model, I review the current status of numerical simulations of multiphase disks, focusing on measurements of quantities that characterize the mean properties of the diffuse ISM. Based on simulations, turbulence levels in the diffuse ISM appear relatively insensitive to local disk conditions and energetic driving rates, consistent with observations. It remains to be determined, both from observations and simulations, how mass exchange processes control the ratio of cold-to-warm gas in the atomic ISM.

scholarly journals Deformed compact extra space as dark matter candidate

2015 ◽  
Vol 24 (13) ◽  
Author(s):  
Vakhid A. Gani ◽  
Alexander E. Dmitriev ◽  
Sergey G. Rubin
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Spatial Domain ◽  
Dark Matter Candidate ◽  
Observational Constraints ◽  
Two Dimensional ◽  
Ordinary Matter ◽  
Multidimensional Gravity ◽  
Extra Space ◽  
Defect Estimation

We elaborate the possibility for a deformed extra space to be considered as the dark matter candidate. To perform calculations, a class of two-dimensional extra metrics was considered in the framework of the multidimensional gravity. It was shown that there exists a family of stationary metrics of the extra space possessing point-like defect. Estimation of cross-section of scattering of a particle of the ordinary matter on a spatial domain with deformed extra space is in agreement with the observational constraints.

scholarly journals A quantum theory of spacetime in spinor formalism and the physical reality of cross-ratio representation: the equation of density parameters of dark energy, matter, and ordinary matter is derived: ΩM2 = 4 Ωb ΩΛ

2016 ◽  
Author(s):  
Jackie Liu
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Friedmann Equation ◽  
Physical Reality ◽  
Cross Ratio ◽  
Mathematical Relationship ◽  
Ordinary Matter ◽  
Evolution Of The Universe ◽  
Spinor Formalism ◽  
The Universe

ABSTRACT By theorizing the physical reality through the deformation of an arbitrary cross-ratio, we leverage Galois differential theory to describe the dynamics of isomonodromic integratable system. We found a new description of curvature of spacetime by the equivalency of isomonodromic integratable system and Penrose’s spinor formalism of general relativity. Using such description, we hypothetically quantize the curvature of spacetime (gravity) and apply to the problem of the evolution of the universe. The Friedmann equation is recovered and compared so that the mathematical relationship among dark energy, matter (dark matter + ordinary matter), and ordinary matter, ΩM2≃4ΩbΩΛ, is derived; the actual observed results are compared to this equation (calculated ΩM = 0.33 vs. observed ΩM = 0.31); the model might explain the origin of dark energy and dark matter of the evolution of the universe.

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