scholarly journals Parametrization of $X_\mathrm{max}$ distributions in the ultra-high energy regime

2019 ◽  
Author(s):  
Luan Arbeletche ◽  
Vitor de Souza
Keyword(s):  
High Energy ◽  
Ultra 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 Search for UHE neutrinos in coincidence with LIGO GW150914 event with the Pierre Auger Observatory

2016 ◽  
Vol 12 (S324) ◽  
pp. 295-298
Author(s):  
Lili Yang ◽  
Keyword(s):  
Energy Range ◽  
Gravitational Wave ◽  
High Energy ◽  
Universal Time ◽  
Pierre Auger Observatory ◽  
Ultra High Energy ◽  
Upper Limit ◽  
Surface Detector ◽  
High Energy Regime

AbstractThe first gravitational wave transient GW150914 was observed by Advanced LIGO on September 14th, 2015 at 09:50:45 Universal Time. In addition to follow-up electromagnetic observations, the detection of neutrinos will probe deeply and more on the nature of astrophysical sources, especially in the ultra-high energy regime. Neutrinos in the EeV energy range were searched in data collected at the surface detector of the Pierre Auger Observatory within ± 500 s and 1 day after the GW150914 event. No neutrino candidates were found. Based on this non-observation, we derive the first and only neutrino fluence upper limit at EeV energies for this event at 90% CL, and report constraints on existence of accretion disk around mergers.

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.

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