scholarly journals КОМПОНЕНТ ТЕМНОЇ МАТЕРІЇ І СОНЦЕ

2021 ◽  
pp. 138-153
Author(s):  
А. Н. Нарожный ◽  
Д. М. Шлифер
Keyword(s):  
Dark Matter ◽  
Microwave Radiation ◽  
Gravitational Interaction ◽  
Emission Spectra ◽  
Observation Point ◽  
The Sun ◽  
Temperature Deviation ◽  
Conservation Of Energy ◽  
Stellar Radiation ◽  
The Galaxy

Some consequences from the hypothesis of the origin of particles of one of the components of dark matter are presented. The reason for the hypothesis was the observational data of stellar radiation, considered through the prism of the relationship of all phenomena in Nature and the law of conservation of energy. It is argued that a part of the stellar electromagnetic radiation, which does not participate in the interaction with baryonic matter, will not wander forever in space. This radiation will interact with a subtle level of matter, continuously giving it its energy, shifting to the microwave region. In this frequency region, two quanta of close energies can form a neutral boson of spin 0, or spin 2, on opposite “courses”. Based on the observed spectrum of cosmic microwave radiation, it is assumed that these Bose particles have a continuous mass spectrum. These light nonrelativistic bosons are precisely the component of the thin medium that interacts with stellar radiation, taking energy from it. Bose particles participate in gravitational interactions. This means that in addition to the distribution of dark matter around galaxies, an increased concentration of particles in the form of large clouds can be observed in it. If an internal shock wave appears in such a cloud, located far from galactic streams of baryon particles, it will destroy the particles of the cloud, creating “strange radio circles” visible exclusively in the radio range. The gravitational interaction causes dark particles to drift towards large clusters of visible matter. The process of their drift to massive objects will be accompanied by resistance from the outgoing stellar radiation. Therefore, near the surface of a burning star, these particles themselves will resist the outgoing radiation, shifting it towards longer wavelengths. The plasma ejected by the star, with sufficient energy of its particles, is capable of destroying the particles of the dark component, creating pairs of photons and providing itself with "seed" quanta for bremsstrahlung. Free quanta remaining from the decay of dark particles will give microwave radiation. Therefore, burning stars should exhibit a redshift in the emission spectra and microwave radiation. Taking a certain model in the distribution of the dark component of matter near the Sun, it is possible to predict the nature of the redshift in the spectra of its radiation as the observation point moves along the solar disk from its center to the limb. A similar conclusion is made regarding the intensity of microwave radiation near the surface of the star. The galactic movement of the Sun should lead to some temperature effects associated with a denser counter flow of dark particles to the corresponding area of the solar surface. Knowing the direction of motion of the Sun in the Galaxy, based on the results of the temperature deviation on the surface of the star, one can determine the local speed and direction of movement of the cloud of the dark component of matter.

КОСМІЧНІ «ДИВНІ РАДІОКРУГІ» (ODD RADIO CIRCLES)

2020 ◽  
pp. 162-171
Author(s):  
А. Н. Нарожный
Keyword(s):  
Dark Matter ◽  
Shock Waves ◽  
Radio Emission ◽  
Microwave Radiation ◽  
Electromagnetic Waves ◽  
Outer Space ◽  
Gravitational Interaction ◽  
Emission Spectra ◽  
Radio Range ◽  
Space Objects

The discovered space objects, called by the authors "strange radio circles", emitting exclusively in the radio range, have not yet found their explanation. However, a hypothesis and a mechanism associated with it were previously put forward, which is capable of emitting radiation in the radio range. In this case, the radiating region in the observation plane can be represented as circular. The hypothesis and mechanism relate to the origin of particles of one of the components of dark matter. They appeared as a result of the analysis of the process of the propagation of stellar radiation by outer space. This radiation cannot propagate indefinitely in space without interacting with anything, since the absence of interaction contradicts the philosophical principle of the interconnection of phenomena in Nature. Therefore, when radiation quanta move across the expanses of the Universe, there must be weak dissipative losses due to the interaction of electromagnetic quanta with thin levels of matter, which leads to redshifts in the emission spectra of galaxies. It was also suggested earlier that quanta losing energy, gradually shifting to the region of long waves, can, under certain conditions, pairwise combine into very light neutral Bose particles, which are a component of dark matter. These particles have spin 0, or spin 2 and a mass of 0.0013 eV and below. These particles will be characterized by their gravitational interaction, both among themselves and with galactic objects. Neutral Bose particles under the action of perturbations can decay into pairs of bound photons. Therefore, the perturbation of the medium of the supposed particles should lead to the appearance of microwave radiation. The destruction of the dark component into quanta explains, for example, the presence of powerful radio emission from active galactic nuclei (quasars, radio galaxies) and large variations in the intensity of microwave radiation at short time intervals, recorded by the ARCADE radiometer (NASA). Taking the hypothesis of the origin of the specified component of dark matter, one can explain the origin of the "strange radio circles". To do this, it is enough to assume that this dark component is organized into clouds of different lengths and densities. Especially far from active galactic zones, where there are no powerful streams of baryonic matter - plasma, gas, dust. For example, in the high galactic latitudes of the Milky Way. In this case, the appearance of shock waves in the center of the cloud will lead to the decay of particles and the emission of photons of the specified range. Objects such as these clouds cannot be observed in any other range of electromagnetic waves. Likewise, radio emission from small galaxies with increased density of dark matter in the halo can be observed, the particles of which can be destroyed by disturbances coming from the galactic core. After the complete emission of energy by the disturbing baryon component, only radiation from the destroyed particles of the dark component remains under the action of shock waves in its medium. The radiation from strange radio circles can serve as an indirect confirmation of the previously stated hypothesis about the origin of the dark matter component

scholarly journals Dark Matter Near the Sun: Simulated Star Counts and the Oort Limit

1984 ◽  
Vol 81 ◽  
pp. 326-329
Author(s):  
David Gilden ◽  
John N. Bahcall
Keyword(s):  
Dark Matter ◽  
Galactic Disk ◽  
The Sun ◽  
Sampling Errors ◽  
Specific Mass ◽  
Mass Model ◽  
Density Distributions ◽  
Self Consistent ◽  
The Galaxy ◽  
Solar Position

AbstractAn ensemble of orbits passing through the solar position have been generated for a specific mass model of the galaxy. These orbits are randomly sampled to form simulated density distributions of tracer stars perpendicular to the galactic disk. The simulated distributions are analyzed in order to determine the sampling errors in a self-consistent derivation of the total amount of matter near the sun (the Oort limit).

scholarly journals КОСМІЧНЕ МІКРОХВИЛЬОВЕ ВИПРОМІНЮВАННЯ І ТЕМНА МАТЕРІЯ

2018 ◽  
pp. 83-101
Author(s):  
Анатолий Николаевич Нарожный
Keyword(s):  
Dark Matter ◽  
Electromagnetic Radiation ◽  
Microwave Radiation ◽  
Relaxation Processes ◽  
Main Question ◽  
Conservation Of Energy ◽  
The Earth ◽  
Starting Point ◽  
The Universe ◽  
Cosmic Microwave Radiation

The question of the possible origin of one of the components of dark matter filling the galaxies is considered. The analysis of the “fate” of stellar electromagnetic radiation under the conditions of the eternal Universe is taken as a starting point. Based on a comparison of the average lifetime of a star in the active phase and the lifetime of the non-absorbed part of its radiation, it is concluded that the Universe is filled with stellar electromagnetic radiation. However, based on existing concepts, as well as the red shift found in the spectra of distant galaxies, the addition of new radiation to the existing in the Universe will be accompanied by the “disappearance” of radiation in the most long-wave region, that is, there will be a violation of the law of conservation of energy. The main question arises: can radiation as well as energy disappear without a trace? The answer is negative, and it is explained by the involvement of the mechanism of dissipative losses during the radiative transfer by the expanses of the Universe. For this purpose, an assumption is introduced about the presence of an agent's medium interacting with quanta of radiation with the help of excessively weak forces. It is hypothesized that photons that fall into the low-frequency region (microwave band and ranges close to it) are able to pair up in an agent's medium, creating neutral particles of extremely small masses (about 0.0013 eV). These particles - bosons - are particles of the agent itself. Based on the nature of the agent, some observational data related to the Solar System (increased distance between the Sun and the Earth, the "floating" value of the G gravitation constant, scintillations of cosmic microwave radiation), as well as detected deviations observed during spacecraft acceleration with gravitational slingshots near the Earth (Galileo, NEAR, Rosetta, Messenger, Cassini). In addition, this hypothesis regarding the origin and properties of the agent explains some of the results of laboratory research: scintillations of the rates of chemical and biochemical reactions, floating "zero" of high-precision instruments and, possibly, relaxation processes in elastic solids (material aging). The main conclusions: cosmic microwave radiation is a remnant of stellar radiation, and the agent's medium is a component of dark matter, which is closely associated with cosmic microwave radiation. Other dark matter components are extinct stars, their various cold fragments, including gases and dust, and possibly other deeper structural levels of matter.

scholarly journals Velocity independent constraints on spin-dependent DM-nucleon interactions from IceCube and PICO

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
M. G. Aartsen ◽  
◽  
M. Ackermann ◽  
J. Adams ◽  
J. A. Aguilar ◽  
...  
Keyword(s):  
Dark Matter ◽  
Velocity Distribution ◽  
Cross Section ◽  
Local Density ◽  
Bubble Chamber ◽  
High Energy ◽  
The Self ◽  
The Sun ◽  
The Galaxy ◽  
Spin Dependent Scattering

AbstractAdopting the Standard Halo Model (SHM) of an isotropic Maxwellian velocity distribution for dark matter (DM) particles in the Galaxy, the most stringent current constraints on their spin-dependent scattering cross-section with nucleons come from the IceCube neutrino observatory and the PICO-60 $$\hbox {C}_3\hbox {F}_8$$ C 3 F 8 superheated bubble chamber experiments. The former is sensitive to high energy neutrinos from the self-annihilation of DM particles captured in the Sun, while the latter looks for nuclear recoil events from DM scattering off nucleons. Although slower DM particles are more likely to be captured by the Sun, the faster ones are more likely to be detected by PICO. Recent N-body simulations suggest significant deviations from the SHM for the smooth halo component of the DM, while observations hint at a dominant fraction of the local DM being in substructures. We use the method of Ferrer et al. (JCAP 1509: 052, 2015) to exploit the complementarity between the two approaches and derive conservative constraints on DM-nucleon scattering. Our results constrain $$\sigma _{\mathrm{SD}} \lesssim 3 \times 10^{-39} \mathrm {cm}^2$$ σ SD ≲ 3 × 10 - 39 cm 2 ($$6 \times 10^{-38} \mathrm {cm}^2$$ 6 × 10 - 38 cm 2 ) at $$\gtrsim 90\%$$ ≳ 90 % C.L. for a DM particle of mass 1 TeV annihilating into $$\tau ^+ \tau ^-$$ τ + τ - ($$b\bar{b}$$ b b ¯ ) with a local density of $$\rho _{\mathrm{DM}} = 0.3~\mathrm {GeV/cm}^3$$ ρ DM = 0.3 GeV / cm 3 . The constraints scale inversely with $$\rho _{\mathrm{DM}}$$ ρ DM and are independent of the DM velocity distribution.

scholarly journals Dark angular momentum of the galaxy

2018 ◽  
Vol 27 (14) ◽  
pp. 1847012 ◽  
Author(s):  
Angelo Tartaglia
Keyword(s):  
Magnetic Field ◽  
Dark Matter ◽  
Dark Halo ◽  
The Sun ◽  
Baryonic Matter ◽  
Gravitational Effects ◽  
Lagrange Points ◽  
Visible Matter ◽  
The Galaxy ◽  
The Times

This paper proposes a strategy for detecting the presence of a gravito-magnetic field due to the rotation of the galactic dark halo. Visible matter in galaxies rotates and dark matter, supposed to form a halo incorporating baryonic matter, rotates also, since it interacts gravitationally with the rest. Pursuing the same line of reasoning, dark matter should produce all gravitational effects predicted by general relativity, including a gravito-magnetic field. I discuss a possible strategy for measuring that field. The idea recovers the old Sagnac effect and proposes to use a triangle having three Lagrange points of the Sun–Earth pair at its vertices. The asymmetry in the times of flight along the loop in opposite directions is proportional to the gravito-magnetic galactic field.

scholarly journals Dark Matter in the Galactic Disk

1987 ◽  
Vol 117 ◽  
pp. 17-31 ◽  
Author(s):  
John N. Bahcall
Keyword(s):  
Dark Matter ◽  
Proper Motion ◽  
Column Density ◽  
Galactic Disk ◽  
Volume Density ◽  
Scale Height ◽  
The Sun ◽  
Vlasov Equations ◽  
Disk Mass ◽  
The Galaxy

The Poisson and Vlasov equations are solved self-consistently for realistic Galaxy models which include multiple disk components, a Population II spheroid, and an unseen massive halo. The total amount of matter in the vicinity of the Sun is determined by comparing the observed distributions of tracer stars, samples of F dwarfs and of K giants, with the predictions of the Galaxy models. Results are obtained for a number of different assumed distributions of the unseen disk mass. The major uncertainties, observational and theoretical, are estimated. For all the observed samples, typical models imply that about half of the mass in the solar vicinity must be in the form of unobserved matter. The volume density of unobserved material near the Sun is about 0.1M⊙pc−3; the corresponding column density is about 30M⊙pc−2. This so far unseen material must be in a disk with an exponential scale height of less than 0.7 kpc. If the unseen material is in the form of stars with masses less than 0.1M⊙, then the nearest such object is about 1 pc away and has a proper motion of more than 1 arcsecond per year.

Dark matter near the Sun

1986 ◽  
Vol 320 (1556) ◽  
pp. 543-551 ◽  
Keyword(s):  
Dark Matter ◽  
Volume Density ◽  
Scale Height ◽  
The Sun ◽  
Clusters Of Galaxies ◽  
Low Mass Stars ◽  
Disc Material ◽  
The Galaxy ◽  
Low Mass ◽  
Solar Position

The amount of dark matter in the disc of the Galaxy at the solar position is determined by comparing the observed distributions of tracer stars with the predictions obtained from different assumptions of how the unseen matter is distributed. The major uncertainties, observational and theoretical, are estimated. For all the observed samples, typical models imply that about half of the mass in the solar vicinity must be in the form of unobserved matter. The volume density of unobserved material near the Sun is about 0.1 M pc -3 ; the corresponding column density is about 30 M pc -2 (1 pc ~ 30857 x 10 12 m). This, so far unseen, material must be in a disc with an exponential scale height of less than 0.7 kpc. All the existing observations are consistent with the unseen disc material being in the form of stars not massive enough to burn hydrogen. It is suggested that the unseen material that is required to hold up the rotation curves of galaxies and to satisfy the virial theorem for clusters of galaxies might also be in the form of low-mass stars.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

scholarly journals Detecting Cold Dark Matter Candidates

1987 ◽  
Vol 117 ◽  
pp. 490-490
Author(s):  
A. K. Drukier ◽  
K. Freese ◽  
D. N. Spergel
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Galactic Halo ◽  
Dark Matter Particle ◽  
Low Energy ◽  
The Sun ◽  
Background Rate ◽  
System Noise ◽  
Weakly Interacting ◽  
Massive Neutrinos

We consider the use of superheated superconducting colloids as detectors of weakly interacting galactic halo candidate particles (e.g. photinos, massive neutrinos, and scalar neutrinos). These low temperature detectors are sensitive to the deposition of a few hundreds of eV's. The recoil of a dark matter particle off of a superheated superconducting grain in the detector causes the grain to make a transition to the normal state. Their low energy threshold makes this class of detectors ideal for detecting massive weakly interacting halo particles.We discuss realistic models for the detector and for the galactic halo. We show that the expected count rate (≈103 count/day for scalar and massive neutrinos) exceeds the expected background by several orders of magnitude. For photinos, we expect ≈1 count/day, more than 100 times the predicted background rate. We find that if the detector temperature is maintained at 50 mK and the system noise is reduced below 5 × 10−4 flux quanta, particles with mass as low as 2 GeV can be detected. We show that the earth's motion around the Sun can produce a significant annual modulation in the signal.

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