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 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.

On the Coupling Between Adjacent Turbulent Jets

2002 ◽  
Author(s):  
S. D. LePera ◽  
U. Vandsburger
Keyword(s):  
Large Scale ◽  
Turbulent Jets ◽  
Detailed Examination ◽  
Initial Study ◽  
Active Components ◽  
Large Scale Structures ◽  
Air Jets ◽  
Scale Structures ◽  
Value Decomposition ◽  
Maximum Reliability

A detailed examination of the coupling observed between adjacent turbulent jets, one of which was externally excited, is presented. The study is relevant to the active control of combustion and mixing devices; applications which demand maximum reliability and minimal power consumption by their active elements. To this end, it is desirable for each active component to affect several simple, non-active components in the system. An initial study of three collinear turbulent air jets was seen to enhance the mixing of adjacent, unforced jets with ambient fluid by 15–20%. The work presented here examines this phenomena using quantitative PLIF mixing measurements, three component and single-wire velocity measurements, qualitative flow visualization, and reduced singular value decomposition (SVD). This analysis of the data shows that the mixing improvement in the adjacent, unforced jets is primarily due to the low level perturbation at the exit of the unforced jets induced by the periodic forcing in the active center jet. This improved mixing is shown to be a result of amplification of the +/-1 spatial mode. Large scale structures in the central, forced jet are shown not to effect the behavior of the adjacent jets.

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.

scholarly journals Potential Role of the Entanglement Velocity of 1023 m·s-1 to Accommodate Recent Measurements of Large Scale Structures of the Universe

2014 ◽  
Vol 42 ◽  
pp. 106-112
Author(s):  
Michael A. Persinger ◽  
Stanley A. Koren
Keyword(s):  
Large Scale ◽  
Potential Role ◽  
Gravitational Constant ◽  
Rest Mass ◽  
Large Scale Structures ◽  
Inertial Frames ◽  
Order Of Magnitude ◽  
Scale Structures ◽  
The Universe

The aggregate of m7·s-1 from the product of the four geometric terms for increasing dimensions of a closed path (a circle) when set equal to the optimal combinations of the gravitational constant G and the universe’s mass, length and time results in a diffusivity term of 1023 m·s-1. Conversion of the total energy of the universe to volts per meter and Tesla results in a velocity of the same order of magnitude. The required f6 multiplication to balance the terms solves optimally for a frequency that when divided by the modified Planck’s value is the equivalent upper limit of the rest mass of a photon. Several experimental times associated with orbital distances for inertial frames are consistent with this velocity. Calculations indicate that during the final epoch the velocity from the energy derived from universal potential difference over length and magnetic fields will require only a unit frequency adjustment that corresponds to the energy equivalent of one orbit of a Bohr electron. We suggest that one intrinsic process by which large scale structures (Gigaparsec) are organized could involve this “entanglement velocity”. It would be correlated with the transformation of “virtual” or subthreshold values of the upper rest mass of photons to their energetic manifestation as the universe emerges from dark energy or matter that is yet to appear.

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