superluminal propagation
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2021 ◽  
Vol 06 (12) ◽  
Author(s):  
Zihua Zhang ◽  

Another kind of ultra-fast phenomenon, superluminal transmission of light pulse,was proposed, its velocity can faster than the infinite that was proved in theory and experiment. Based on two kinds of epistemology and world, both deeply effects on Science and technology and open new application of Laser discussed briefly. We also suggested add the content of two kinds of epistemology and worlds in Physics to clear the relationship between the Relativity and general Physics



2021 ◽  
Vol 118 ◽  
pp. 111220
Author(s):  
Azmat Iqbal Bashir ◽  
Arif Khan ◽  
Bakht Amin Bacha ◽  
Muhammad Ashfaq Ahmad ◽  
Muhammad Junaid Amjad ◽  
...  


2021 ◽  
Vol 115 ◽  
pp. 111047
Author(s):  
Azmat Iqbal Bashir ◽  
Arif Khan ◽  
Bakht Amin Bacha ◽  
Muhammad Ashfaq Ahmad ◽  
Muhammad Junaid Amjad ◽  
...  


2021 ◽  
Vol 388 ◽  
pp. 127041
Author(s):  
Syed Muhammad Arif ◽  
Bakht Amin Bacha ◽  
Umer Wahid ◽  
Muhammad Haneef ◽  
Arif Ullah


2021 ◽  
pp. 1-1
Author(s):  
Liang Zhang ◽  
Zhelan Xiao ◽  
Zenghuan Qiu ◽  
Jilin Zhang ◽  
Li Zhan ◽  
...  


2021 ◽  
Author(s):  
Zhelan Xiao ◽  
Zenghuan Qiu ◽  
Jilin Zhang ◽  
Haoran Xie ◽  
Yikun Jiang ◽  
...  


2021 ◽  
Vol 69 (1) ◽  
pp. 297-307
Author(s):  
Robert S. C. Winter ◽  
Daniel Oloumi ◽  
Karumudi Rambabu


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


2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Raúl Carballo-Rubio ◽  
Francesco Di Filippo ◽  
Stefano Liberati ◽  
Matt Visser

Abstract We investigate the causal hierarchy in various modified theories of gravity. In general relativity the standard causal hierarchy, (key elements of which are chronology, causality, strong causality, stable causality, and global hyperbolicity), is well-established. In modified theories of gravity there is typically considerable extra structure, (such as: multiple metrics, aether fields, modified dispersion relations, Hořava-like gravity, parabolic propagation, etcetera), requiring a reassessment and rephrasing of the usual causal hierarchy. We shall show that in this extended framework suitable causal hierarchies can indeed be established, and discuss the implications for the interplay between “superluminal” propagation and causality. The key distinguishing feature is whether the signal velocity is finite or infinite. Preserving even minimal notions of causality in the presence of infinite signal velocity requires the aether field to be both unique and hypersurface orthogonal, leading us to introduce the notion of global parabolicity.



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