On the role of large-scale structures in wall turbulence

2001 ◽  
Vol 13 (3) ◽  
pp. 735-743 ◽  
Author(s):  
Ivan Marusic
Keyword(s):  
Large Scale ◽  
Wall Turbulence ◽  
Large Scale Structures ◽  
Scale Structures

scholarly journals Cosmic Inflation, Quantum Information and the Pioneering Role of John S Bell in Cosmology

Universe ◽  
2019 ◽  
Vol 5 (4) ◽  
pp. 92 ◽  
Author(s):  
Jérôme Martin
Keyword(s):  
Quantum Mechanics ◽  
Quantum Information ◽  
Large Scale ◽  
Gravitational Instability ◽  
Cosmic Inflation ◽  
Large Scale Structures ◽  
Scale Structures ◽  
Accuracy Data ◽  
Made In

According to the theory of cosmic inflation, the large scale structures observed in our Universe (galaxies, clusters of galaxies, Cosmic Background Microwave—CMB—anisotropy...) are of quantum mechanical origin. They are nothing but vacuum fluctuations, stretched to cosmological scales by the cosmic expansion and amplified by gravitational instability. At the end of inflation, these perturbations are placed in a two-mode squeezed state with the strongest squeezing ever produced in Nature (much larger than anything that can be made in the laboratory on Earth). This article studies whether astrophysical observations could unambiguously reveal this quantum origin by borrowing ideas from quantum information theory. It is argued that some of the tools needed to carry out this task have been discussed long ago by J. Bell in a, so far, largely unrecognized contribution. A detailled study of his paper and of the criticisms that have been put forward against his work is presented. Although J. Bell could not have realized it when he wrote his letter since the quantum state of cosmological perturbations was not yet fully characterized at that time, it is also shown that Cosmology and cosmic inflation represent the most interesting frameworks to apply the concepts he investigated. This confirms that cosmic inflation is not only a successful paradigm to understand the early Universe. It is also the only situation in Physics where one crucially needs General Relativity and Quantum Mechanics to derive the predictions of a theory and, where, at the same time, we have high-accuracy data to test these predictions, making inflation a playground of utmost importance to discuss foundational issues in Quantum Mechanics.

The role of large scale structures in turbulent jets

1977 ◽  
Vol 20 (10) ◽  
pp. S290
Author(s):  
J. Laufer ◽  
F. K. Browand ◽  
R. A. Petersen
Keyword(s):  
Large Scale ◽  
Turbulent Jets ◽  
Large Scale Structures ◽  
Scale Structures

scholarly journals Large-scale Structures in the CANDELS Fields: The Role of the Environment in Star Formation Activity

2020 ◽  
Vol 890 (1) ◽  
pp. 7 ◽  
Author(s):  
Nima Chartab ◽  
Bahram Mobasher ◽  
Behnam Darvish ◽  
Steve Finkelstein ◽  
Yicheng Guo ◽  
...  
Keyword(s):  
Star Formation ◽  
Large Scale ◽  
Large Scale Structures ◽  
Star Formation Activity ◽  
Scale Structures

scholarly journals The Theory of Large-Scale Structure of the Universe: Local Properties and Global Topology

1983 ◽  
Vol 104 ◽  
pp. 387-391
Author(s):  
A. G. Doroshkevich ◽  
S. F. Shandarin ◽  
Ya.B. Zeldovich
Keyword(s):  
Cellular Structure ◽  
Large Scale ◽  
Rest Mass ◽  
Large Scale Structure ◽  
Large Scale Structures ◽  
Global Topology ◽  
Local Properties ◽  
Scale Structures ◽  
The Universe

Properties of the large-scale distribution of galaxies are considered. Particular attention is paid to properties of the large-scale structures such as anisotropy of superclusters and the existence of large regions practically devoid of galaxies. Another question discussed in detail is the link between superclusters and formation of a network or cellular structure. An explanation of the latter is proposed in the frame of the fragmentation scenario. The role of the neutrino rest mass is discussed.

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