Another ultra-fast phenomena, superluminal propagation of pulse, and its application

2021 ◽  
Author(s):  
Zihua zhang ◽  
Huaan zhang ◽  
Su zhang ◽  
Zhiying Zhong
Keyword(s):  
Superluminal Propagation

Apparent Superluminal Propagation of a Laser Pulse in a Gain Medium

2001 ◽  
Author(s):  
Phillip Sprangle ◽  
Joseph Penano ◽  
Bahman Hafizi
Keyword(s):  
Laser Pulse ◽  
Gain Medium ◽  
Superluminal Propagation

Degrees of freedom and problems in f(T) gravity

2018 ◽  
Vol 15 (supp01) ◽  
pp. 1850139 ◽  
Author(s):  
Yen Chin Ong
Keyword(s):  
Degrees Of Freedom ◽  
Lorentz Invariance ◽  
Modified Theories Of Gravity ◽  
Recent Effort ◽  
Original Formulation ◽  
Actual Number ◽  
Specific Choice ◽  
Superluminal Propagation ◽  
Theories Of Gravity ◽  
Local Lorentz Invariance

Torsion-based modified theories of gravity, such as [Formula: see text] gravity, are arguably one of the very few “true” modified gravities based on well-defined geometric structures. However, the original formulation explicitly works in a specific choice of frame, which has led to considerable amount of confusion in the literature about these theories breaking local Lorentz invariance. Pathological properties such as superluminal propagation and the lack of well-posedness of Cauchy problem were found to plague [Formula: see text] gravity. Recent effort to “covariantize” [Formula: see text] gravity has, however, renewed interests in this subject. In this proceeding paper, we review and discuss issues concerning the actual number of degrees of freedom in [Formula: see text] gravity, and how this might relate to the aforementioned pathologies.

Subluminal and superluminal propagation in a three-level atom in the radiative limit based on coherent population oscillations

2008 ◽  
Vol 372 (42) ◽  
pp. 6334-6339 ◽  
Author(s):  
Isabel Gonzalo ◽  
M.A. Antón ◽  
F. Carreño ◽  
Oscar G. Calderón
Keyword(s):  
Level Atom ◽  
Superluminal Propagation

scholarly journals Stabilized Long-distance Superluminal Propagation Based on Polarization-matched Low-noise Brillouin Lasing Resonance

2021 ◽  
pp. 1-1
Author(s):  
Liang Zhang ◽  
Zhelan Xiao ◽  
Zenghuan Qiu ◽  
Jilin Zhang ◽  
Li Zhan ◽  
...  
Keyword(s):  
Low Noise ◽  
Long Distance ◽  
Superluminal Propagation

Stabilized Fast Light and Superluminal Propagation via Linearly Polarized Brillouin Lasing Oscillation

2021 ◽  
Author(s):  
Zhelan Xiao ◽  
Zenghuan Qiu ◽  
Jilin Zhang ◽  
Haoran Xie ◽  
Yikun Jiang ◽  
...  
Keyword(s):  
Superluminal Propagation ◽  
Linearly Polarized ◽  
Fast Light
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