scholarly journals DO ACTIVE GALACTIC NUCLEI CONVERT DARK MATTER INTO VISIBLE PARTICLES?

2008 ◽  
Vol 23 (16) ◽  
pp. 1151-1159 ◽  
Author(s):  
A. A. GRIB ◽  
YU. V. PAVLOV
Keyword(s):  
Black Hole ◽  
Dark Matter ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
High Energy ◽  
Grand Unification ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
Opposite Process ◽  
Penrose Process

The hypothesis that dark matter consists of superheavy particles with the mass close to the Grand Unification scale is investigated. These particles were created from vacuum by the gravitation of the expanding Universe and their decay led to the observable baryon charge. Some part of these particles with the lifetime larger than the time of breaking of the Grand Unification symmetry became metastable and survived up to the modern time as dark matter. However, in active galactic nuclei due to large energies of dark matter particles swallowed by the black hole and the possibility of the Penrose process for rotating black hole the opposite process can occur. Dark matter particles become interacting. Their decay on visible particles at the Grand Unification energies leads to the flow of ultra high energy cosmic rays observed by the Auger group. Numerical estimates of the effect leading to the observable numbers are given.

scholarly journals Planck Neutrinos as Ultra High Energy Cosmic Rays

2020 ◽  
Vol 29 (1) ◽  
pp. 40-46
Author(s):  
Dmitri L. Khokhlov
Keyword(s):  
Black Holes ◽  
Cosmic Rays ◽  
Standard Model ◽  
Active Galactic Nuclei ◽  
Planck Scale ◽  
Galactic Nuclei ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
The Standard Model

AbstractThe studied conjecture is that ultra high energy cosmic rays (UHECRs) are hypothetical Planck neutrinos arising in the decay of the protons falling onto the gravastar. The proton is assumed to decay at the Planck scale into positron and four Planck neutrinos. The supermassive black holes inside active galactic nuclei, while interpreted as gravastars, are considered as UHECR sources. The scattering of the Planck neutrinos by the proton at the Planck scale is considered. The Planck neutrinos contribution to the CR events may explain the CR spectrum from 5 × 1018 eV to 1020 eV. The muon number in the Planck neutrinos-initiated shower is estimated to be larger by a factor of 3/2 in comparison with the standard model that is consistent with the observational data.

MAGNEOWAVE INDUCED PLASMA WAKEFIELD ACCELERATION AS A MECHANISM FOR UHECR

2011 ◽  
Vol 01 ◽  
pp. 151-156
Author(s):  
FENG-YIN CHANG ◽  
PISIN CHEN ◽  
GUEY-LIN LIN ◽  
ROBERT NOBLE ◽  
RICHARD SYDORA
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
High Energy ◽  
Plasma Simulation ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
High Energies ◽  
Wakefield Acceleration ◽  
Plasma Wakefield ◽  
Viable Mechanism

Magnetowave induced plasma wakefield acceleration (MPWA) in a relativistic astrophysical outflow has been proposed as a viable mechanism for the acceleration of cosmic particles to ultra high energies. In this paper we present the relativistic MPWA theory and confirm such a concept via the plasma simulation. Invoking Active Galactic Nuclei (AGN) as the site, we show that MPWA production of ultra high energy cosmic rays (UHECR) beyond ZeV (1021 eV) is possible.

scholarly journals ON ACCELERATION AND PROPAGATION OF ULTRA-HIGH ENERGY COSMIC RAYS

2009 ◽  
Vol 18 (10) ◽  
pp. 1583-1586
Author(s):  
MARTIN LEMOINE
Keyword(s):  
Cosmic Rays ◽  
Active Galactic Nuclei ◽  
Large Scale ◽  
Gamma Ray ◽  
Galactic Nuclei ◽  
High Energy ◽  
Current Data ◽  
Type I ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays

This paper discusses the correlation reported in 2008 by the Pierre Auger Observatory (PAO) of the arrival directions of the highest energy cosmic rays with active galactic nuclei (AGN). It is argued that these correlating AGN do not have the power required to be the sources of ultra-high energy protons. This current PAO dataset is further shown to disfavor giant radio-galaxies (both Fanaroff–Riley type I and II) as sources of ultra-high energy protons. The current data thus likely point to the local large scale structure, in which the actual sources of ultra-high energy cosmic rays camouflage. Finally, it is shown that the last gamma-ray burst in Centaurus A could explain, through rescattering on the Cen A lobes, the apparent cluster of events in this direction.

scholarly journals On the acceleration of ultra-high-energy cosmic rays

2008 ◽  
Vol 366 (1884) ◽  
pp. 4417-4428 ◽  
Author(s):  
Federico Fraschetti
Keyword(s):  
Cosmic Rays ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
High Energy ◽  
New Physics ◽  
Acceleration Process ◽  
Tennis Ball ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
The Past

Ultra-high-energy cosmic rays (UHECRs) hit the Earth's atmosphere with energies exceeding 10 18  eV. This is the same energy as carried by a tennis ball moving at 100 km h −1 , but concentrated on a subatomic particle. UHECRs are so rare (the flux of particles with E >10 20  eV is 0.5 km −2 per century) that only a few such particles have been detected over the past 50 years. Recently, the HiRes and Auger experiments have reported the discovery of a high-energy cut-off in the UHECR spectrum, and Auger has found an apparent clustering of the highest energy events towards nearby active galactic nuclei. Consensus is building that the highest energy particles are accelerated within the radio-bright lobes of these objects, but it remains unclear how this actually happens, and whether the cut-off is due to propagation effects or reflects an intrinsically physical limitation of the acceleration process. The low event statistics presently allows for many different plausible models; nevertheless observations are beginning to impose strong constraints on them. These observations have also motivated suggestions that new physics may be implicated. We present a review of the key theoretical and observational issues related to the processes of propagation and acceleration of UHECRs and proposed solutions.

scholarly journals Active Galactic Nuclei: Sources for ultra high energy cosmic rays?

2009 ◽  
Vol 190 ◽  
pp. 61-78 ◽  
Author(s):  
Peter L. Biermann ◽  
Julia K. Becker ◽  
Laurenţiu Caramete ◽  
Alex Curuţiu ◽  
Ralph Engel ◽  
...  
Keyword(s):  
Cosmic Rays ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays

scholarly journals On active galactic nuclei as sources of ultra-high energy cosmic rays

2008 ◽  
Vol 388 (1) ◽  
pp. L59-L63 ◽  
Author(s):  
M. R. George ◽  
A. C. Fabian ◽  
W. H. Baumgartner ◽  
R. F. Mushotzky ◽  
J. Tueller
Keyword(s):  
Cosmic Rays ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays

SUPERHEAVY PARTICLES AS DARK MATTER AND THEIR ROLE IN CREATION OF VISIBLE MATTER IN ACTIVE GALACTIC NUCLEI AND THE EARLY UNIVERSE

2009 ◽  
Vol 24 (08n09) ◽  
pp. 1610-1619 ◽  
Author(s):  
A. A. GRIB ◽  
YU. V. PAVLOV
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Active Galactic Nuclei ◽  
Early Universe ◽  
Galactic Nuclei ◽  
Grand Unification ◽  
Neutral Particles ◽  
Visible Matter ◽  
Rotating Black Holes ◽  
Penrose Process

The hypothesis that dark matter consists of superheavy neutral particles with the mass of the Grand Unification scale is considered. The hypothesis that dark matter is converted into visible one in active galactic nuclei is investigated. If active galactic nuclei are rotating black holes then due to Penrose process superheavy particles can decay on nonstable particles with larger mass the decay of which on quarks and leptons leads to events in cosmic rays observed by the Auger group. Similar processes of decay of superheavy particles of dark matter into visible matter occurred in the early Universe. Numerical estimates of the processes in active galactic nuclei and in the early Universe are given.

Sign in / Sign up

Export Citation Format

Share Document