Vibrational relaxation in He-H2 in the high energy regime

1975 ◽  
Vol 63 (9) ◽  
pp. 4089 ◽  
Author(s):  
P. Novak ◽  
M. A. Wartell
Keyword(s):  
Vibrational Relaxation ◽  
High Energy ◽  
Energy Regime ◽  
High Energy Regime

scholarly journals CROSSING THE PHANTOM DIVIDE WITH k-ESSENCE IN BRANEWORLDS

2010 ◽  
Vol 25 (29) ◽  
pp. 2469-2481 ◽  
Author(s):  
LUIS P. CHIMENTO ◽  
MÓNICA FORTE ◽  
MARTÍN G. RICHARTE
Keyword(s):  
Equation Of State ◽  
High Energy ◽  
Chaplygin Gas ◽  
Energy Conditions ◽  
De Sitter ◽  
Effective Equation ◽  
Phantom Divide ◽  
Energy Regime ◽  
High Energy Regime ◽  
Stable Stage

We study a flat three-brane in the presence of a linear k field with nonzero cosmological constant Λ4. In this model the crossing of the phantom divide (PD) occurs when the k-essence energy density becomes negative. We show that in the high energy regime the effective equation of state has a resemblance of a modified Chaplygin gas while in the low energy regime it becomes linear. We find a scale factor that begins from a singularity and evolves to a de Sitter stable stage while other solutions have a super-accelerated regime and end with a big rip. We use the energy conditions to show when the effective equation of state of the brane-universe crosses the PD.

scholarly journals Evolution of gravitational waves in the high-energy regime of brane-world cosmology

2005 ◽  
Vol 609 (1-2) ◽  
pp. 133-142 ◽  
Author(s):  
Takashi Hiramatsu ◽  
Kazuya Koyama ◽  
Atsushi Taruya
Keyword(s):  
Gravitational Waves ◽  
High Energy ◽  
Brane World ◽  
Energy Regime ◽  
High Energy Regime

scholarly journals A non-perturbative exploration of the high energy regime in $$N_{\mathrm{f}}=3$$ N f = 3 QCD

2018 ◽  
Vol 78 (5) ◽  
Author(s):  
Mattia Dalla Brida ◽  
Patrick Fritzsch ◽  
Tomasz Korzec ◽  
Alberto Ramos ◽  
Stefan Sint ◽  
...  
Keyword(s):  
High Energy ◽  
Energy Regime ◽  
High Energy Regime

scholarly journals A quantum window onto early inflation

2017 ◽  
Vol 26 (12) ◽  
pp. 1743025 ◽  
Author(s):  
Robert J. Hardwick ◽  
Vincent Vennin ◽  
David Wands
Keyword(s):  
Early Universe ◽  
High Energy ◽  
Quantum Corrections ◽  
Classical Dynamics ◽  
Energy Regime ◽  
Inflationary Phase ◽  
High Energy Regime

Inflation in the early universe is one of the most promising probes of gravity in the high-energy regime. However, observable scales give access to a limited window in the inflationary dynamics. In this paper, we argue that quantum corrections to the classical dynamics of cosmological fields allow us to probe much earlier epochs of the inflationary phase and extend this window by many orders of magnitude. We point out that both the statistics of cosmological fluctuations at observable scales, and the field displacements acquired by spectator fields that play an important role in many post-inflationary processes, are sensitive to a much longer phase of the inflationary epoch.

scholarly journals From soft to hard radiation: the role of multiple scatterings in medium-induced gluon emissions

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Carlota Andres ◽  
Fabio Dominguez ◽  
Marcos Gonzalez Martinez
Keyword(s):  
Single Scattering ◽  
High Energy ◽  
Intermediate Energy ◽  
Proper Understanding ◽  
Energy Regime ◽  
Physical Picture ◽  
Hard Radiation ◽  
High Energy Regime ◽  
Analytical Approaches

Abstract A proper understanding of the physics of medium-induced gluon emissions is known to be of critical importance to describe the properties of strongly interacting matter under extreme conditions. In this regard, many theoretical efforts have been directed towards obtaining analytical calculations which might help us discerning the underlying physical picture and the dominant dynamics for different regimes. These analytical approaches rely on approximations whose validity is analyzed here by comparing their results with a recently developed numerical evaluation which includes all-order resummation of multiple scatterings. More specifically, by quantitatively comparing the energy spectrum and rates, we observe that three different regimes — each with its corresponding physical picture — emerge naturally from the equations: the high-energy regime where the emission process is dominated by a single hard scattering, the intermediate-energy regime where coherence effects among multiple scatterings become fundamental, and the low-energy regime where the dynamics is again dominated by a single scattering but where one must include the suppression factor due to the probability of not having any further scatterings (which is obtained through the resummation of virtual terms).

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