scholarly journals High energy collisions of black holes numerically revisited

2016 ◽  
Vol 94 (10) ◽  
Author(s):  
James Healy ◽  
Ian Ruchlin ◽  
Carlos O. Lousto ◽  
Yosef Zlochower
Keyword(s):  
Black Holes ◽  
High Energy ◽  
High Energy Collisions

scholarly journals Universality, Maximum Radiation, and Absorption in High-Energy Collisions of Black Holes with Spin

2013 ◽  
Vol 111 (4) ◽  
Author(s):  
Ulrich Sperhake ◽  
Emanuele Berti ◽  
Vitor Cardoso ◽  
Frans Pretorius
Keyword(s):  
Black Holes ◽  
High Energy ◽  
High Energy Collisions

scholarly journals How black holes form in high energy collisions

2007 ◽  
Vol 39 (10) ◽  
pp. 1525-1532 ◽  
Author(s):  
Nemanja Kaloper ◽  
John Terning
Keyword(s):  
Black Holes ◽  
High Energy ◽  
High Energy Collisions

scholarly journals HOW BLACK HOLES FORM IN HIGH ENERGY COLLISIONS

2008 ◽  
Vol 17 (03n04) ◽  
pp. 665-672 ◽  
Author(s):  
NEMANJA KALOPER ◽  
JOHN TERNING
Keyword(s):  
Shock Wave ◽  
Black Holes ◽  
Gravitational Field ◽  
Impact Parameter ◽  
High Energy ◽  
Original Argument ◽  
Target Particle ◽  
In Trans ◽  
High Energy Collisions ◽  
Schwarzschild Radius

We elucidate how black holes form in trans-Planckian collisions. In the rest frame of one of the incident particles, the gravitational field of the other, which is rapidly moving, looks like a gravitational shock wave. The shock wave focuses the target particle down to a much smaller impact parameter. In turn, the gravitational field of the target particle captures the projectile when the resultant impact parameter is smaller than its own Schwarzschild radius, forming a black hole. One can deduce this by referring to the original argument of escape velocities exceeding the speed of light, which Michell and Laplace used to discover the existence of black holes.

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.

scholarly journals Strangeness Suppression and Color Deconfinement

2018 ◽  
Vol 171 ◽  
pp. 02005
Author(s):  
Helmut Satz
Keyword(s):  
Initial Temperature ◽  
Strange Particle ◽  
High Energy ◽  
Universal Function ◽  
Ideal Gas ◽  
Entropy Density ◽  
Suppression Factor ◽  
Thermal Medium ◽  
High Energy Collisions ◽  
Hadronic Resonances

The relative multiplicities for hadron production in different high energy collisions are in general well described by an ideal gas of all hadronic resonances, except that under certain conditions, strange particle rates are systematically reduced. We show that the suppression factor γs, accounting for reduced strange particle rates in pp, pA and AA collisions at different collision energies, becomes a universal function when expressed in terms of the initial entropy density s0 or the initial temperature T of the produced thermal medium. It is found that γs increases from about 0.5 to 1.0 in a narrow temperature range around the quark-hadron transition temperature Tc ≃ 160 MeV. Strangeness suppression thus disappears with the onset of color deconfinement; subsequently, full equilibrium resonance gas behavior is attained.

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