scholarly journals Soft contribution to the damping rate of a hard photon in a weakly magnetized hot medium

2020 ◽  
Vol 101 (5) ◽  
Author(s):  
Ritesh Ghosh ◽  
Bithika Karmakar ◽  
Munshi G. Mustafa
Keyword(s):  
Hard Photon ◽  
Damping Rate

Study and Investigation of Hard Photons Emission in Heavy Ion Collisions

2021 ◽  
Vol 19 (2) ◽  
pp. 61-65
Author(s):  
Taghreed A. Younis ◽  
Hadi J.M. Al-Agealy
Keyword(s):  
Critical Temperature ◽  
Quark Gluon Plasma ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Heavy Ion Collision ◽  
Hard Photon ◽  
Ion Collisions ◽  
Strength Models ◽  
Ion Collision

This work involves hard photon rate production from quark -gluon plasma QGP interaction in heavy ion collision. Using a quantum chromodynamic model to investigate and calculation of photons rate in 𝑐𝑔 → 𝑠𝑔𝛾 system due to strength coupling, photons rate, temperature of system, flavor number and critical. The photons rate production computed using the perturbative strength models for QGP interactions. The strength coupling was function of temperature of system, flavor number and critical temperature. Its influenced by force with temperature of system, its increased with decreased the temperature and vice versa. The strength coupling has used to examine the confinement and deconfinement of quarks in QGP properties and influence on the photon rate production. In our approach, we calculate the photons rate depending on the strength coupling, photons rate and temperature of system with other factors. The results plotted as a function of the photons energy. The photons rate was decreased with increased temperature and increased with decreased with strength coupling.

Novel features of electromagnetic waves in an isotropic degenerate electron-ion plasma

2021 ◽  
Author(s):  
P. Maryam ◽  
Rozina Chaudhary ◽  
Shahid Ali ◽  
Hassan Amir Shah ◽  
Stefaan Poedts
Keyword(s):  
Nonlinear Interaction ◽  
Electromagnetic Waves ◽  
Tunneling Effect ◽  
Fermi Velocity ◽  
Degenerate Electron ◽  
Linear Dispersion ◽  
Direct Function ◽  
Ion Plasma ◽  
Damping Rate ◽  
Electron Quantum

Abstract Within the framework of kinetic theory, the nonlinear interaction of electromagnetic waves (EMWs) with a degenerate electron-ion plasma is studied to account for the electron quantum mechanical effects. For this purpose, a specific quantum regime is considered, for which the degenerate electron Fermi velocity is assumed to be taken of the order of group velocity of EMWs. This eventually leads to the existence of nonlinear Landau damping rate for the EMWs in the presence of electron Ponderomotive force. The electrons-ion density oscillations may be arisen from the nonlinear interaction of EMWs, leading to a new type of nonlinear Schrödinger equation in terms of a complex amplitude for electromagnetic pump wave. The profiles of nonlinear damping rate reveal that EMWs become less damped for increasing the quantum tunnelling effects. The electrostatic response for the linear electrostatic waves is also investigated and derived a linear dispersion for the ion-acoustic damping rate. The latter is a direct function of electron Fermi speed and does not rely on the Bohm tunneling effect. The obtained results are numerically analyzed for the two microwaves of different harmonics in the context of nonrelativistic astrophysical dense plasma environments, e.g., white dwarfs, where the electron quantum corrections cannot be ignored.

scholarly journals Damping rate of quasiparticles in degenerate ultrarelativistic plasmas

1997 ◽  
Vol 55 (5) ◽  
pp. 3215-3218 ◽  
Author(s):  
Michel Le Bellac ◽  
Cristina Manuel
Keyword(s):  
Damping Rate

Evidence for stopping in heavy-ion collisions from a study of hard-photon source velocities

1994 ◽  
Vol 72 (11) ◽  
pp. 1608-1611 ◽  
Author(s):  
A. Schubert ◽  
R. Holzmann ◽  
S. Hlaváč ◽  
R. Kulessa ◽  
W. Niebur ◽  
...  
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Hard Photon ◽  
Ion Collisions ◽  
Photon Source

Hard Photon Intensity Interferometry in Heavy-Ion Collisions at Intermediate Energies

1996 ◽  
pp. 91-98
Author(s):  
A. Badalà ◽  
R. Barbera ◽  
A. Palmeri ◽  
G. S. Pappalardo ◽  
F. Riggi ◽  
...  
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Hard Photon ◽  
Intensity Interferometry ◽  
Intermediate Energies ◽  
Ion Collisions ◽  
Photon Intensity

scholarly journals On the Formation Mechanism of the Seasonal Persistence Barrier

2021 ◽  
Vol 34 (2) ◽  
pp. 479-494
Author(s):  
Yishuai Jin ◽  
Zhengyu Liu ◽  
Chengfei He ◽  
Yuchu Zhao
Keyword(s):  
Growth Rate ◽  
North Pacific ◽  
Signal To Noise Ratio ◽  
Ar Model ◽  
The North ◽  
Sst Variability ◽  
Damped System ◽  
Damping Rate ◽  
Noise Forcing ◽  
The Tropical Pacific

AbstractThe mechanism of the seasonal persistence barrier (SPB) is studied in the framework of an autoregressive (AR) model. In contrast to the seasonal variance, whose minimum is modulated mainly by the minimum growth rate or noise forcing, the SPB is caused primarily by the declining growth rate or increasing noise forcing, instead of the minimum/maximum of the growth rate or noise forcing. In other words, the SPB is caused by the declining signal-to-noise ratio (SNR) rather than the weakest SNR. In a weakly damped system, the phase of the SPB is delayed from that of declining SNR by about a season. The mechanism is further applied to explain the observed SST variability in the tropical and North Pacific. For the tropical Pacific, the spring SPB could be caused by the decreasing growth rate from September to March and weak annual mean damping rate, instead of the minimum growth rate in spring. Over the North Pacific, the increasing noise forcing from March to June may lead to the summer SPB. Our mechanism provides a null hypothesis for understanding the SPB of climate variability.

scholarly journals Simulating hard photon production with WHIZARD

2021 ◽  
Author(s):  
Pawel Sopicki ◽  
Jan Kalinowski ◽  
Wojciech Kotlarski ◽  
Krzysztof Mękała ◽  
Aleksander Filip Zarnecki
Keyword(s):  
Photon Production ◽  
Hard Photon
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