This map of distant galaxies could help untangle the mystery of dark energy

2022 ◽  
Keyword(s):  
Dark Energy ◽  
Distant Galaxies

scholarly journals Fundamental physics with the Square Kilometre Array

2020 ◽  
Vol 37 ◽  
Author(s):  
A. Weltman ◽  
P. Bull ◽  
S. Camera ◽  
K. Kelley ◽  
H. Padmanabhan ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Gravitational Radiation ◽  
Astroparticle Physics ◽  
Fundamental Physics ◽  
Square Kilometre Array ◽  
Distant Galaxies ◽  
Wide Range ◽  
Order Of Magnitude ◽  
Matter Energy

Abstract The Square Kilometre Array (SKA) is a planned large radio interferometer designed to operate over a wide range of frequencies, and with an order of magnitude greater sensitivity and survey speed than any current radio telescope. The SKA will address many important topics in astronomy, ranging from planet formation to distant galaxies. However, in this work, we consider the perspective of the SKA as a facility for studying physics. We review four areas in which the SKA is expected to make major contributions to our understanding of fundamental physics: cosmic dawn and reionisation; gravity and gravitational radiation; cosmology and dark energy; and dark matter and astroparticle physics. These discussions demonstrate that the SKA will be a spectacular physics machine, which will provide many new breakthroughs and novel insights on matter, energy, and spacetime.

scholarly journals Explanation of the huge difference between vacuum energy and dark energy in the theory of the dynamic medium of reference

2021 ◽  
Vol 34 (1) ◽  
pp. 61-67
Author(s):  
Olivier Pignard
Keyword(s):  
Black Holes ◽  
Dark Energy ◽  
Quantum Entanglement ◽  
Vacuum Energy ◽  
Speed Of Light ◽  
Distant Galaxies ◽  
Planck Time ◽  
The Universe ◽  
Schwarzschild Radius

The object of this article is to present the vacuum energy and the dark energy within the framework of the theory of the dynamic medium of reference and to explain the phenomenal difference between the two energies. The dynamic medium is made up of entities (called gravitons) whose vectorial average of speed determines the speed of the flux of the medium at each point in space. It is shown that inside the horizon of black holes (defined by the Schwarzschild radius), the speed of flux is greater than the speed of light, which means that the gravitons themselves have a higher speed to that of light. The quantum entanglement of two photons which propagate in two opposite directions is due to a connection made by gravitons. It is therefore proposed that the gravitons move at the speed <mml:math display="inline"> <mml:mrow> <mml:msub> <mml:mi>V</mml:mi> <mml:mi>G</mml:mi> </mml:msub> <mml:mo>≈</mml:mo> <mml:mfrac> <mml:mrow> <mml:msub> <mml:mi>R</mml:mi> <mml:mrow> <mml:mtext>universe</mml:mtext> </mml:mrow> </mml:msub> </mml:mrow> <mml:mrow> <mml:msub> <mml:mi>t</mml:mi> <mml:mrow> <mml:mtext>Planck</mml:mtext> </mml:mrow> </mml:msub> </mml:mrow> </mml:mfrac> </mml:mrow> </mml:math> ≈ 2.4 × 1069 m/s, which makes it possible to guarantee the entanglement of the two photons whatever their position in the Universe and the impossibility to measure the time taken by the influence of a photon to arrive at its twin photon because it is less than the Planck time t Planck. The expression of the vacuum energy and that of the dark energy within the framework of the theory of the dynamic medium of reference is established. The two expressions E vacuum and E dark and the value of the speed of the most distant galaxies V galaxy make it possible to calculate an approximate value of the speed of the gravitons <mml:math display="inline"> <mml:msub> <mml:mrow> <mml:mi>V</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>G</mml:mi> </mml:mrow> </mml:msub> <mml:mo>≈</mml:mo> <mml:msub> <mml:mrow> <mml:mi>V</mml:mi> </mml:mrow> <mml:mrow> <mml:mtext mathvariant="normal">galaxy</mml:mtext> </mml:mrow> </mml:msub> <mml:msqrt> <mml:mfrac> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>E</mml:mi> </mml:mrow> <mml:mrow> <mml:mtext mathvariant="normal">vacuum</mml:mtext> </mml:mrow> </mml:msub> </mml:mrow> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>E</mml:mi> </mml:mrow> <mml:mrow> <mml:mtext mathvariant="normal">dark</mml:mtext> </mml:mrow> </mml:msub> </mml:mrow> </mml:mfrac> </mml:msqrt> </mml:math> ≈ 2.8 × 1069 m/s. This value of the speed of the graviton is very close to that obtained by the quantum entanglement of two photons, which reinforces the existence of nonmaterial entities going at these phenomenal speeds.

Bouncing neutrons probe dark energy on a table-top

Nature ◽  
2014 ◽  
Author(s):  
Elizabeth Gibney
Keyword(s):  
Dark Energy

Dark energy on firmer footing

Nature ◽  
2010 ◽  
Author(s):  
Eugenie Samuel Reich
Keyword(s):  
Dark Energy

Dark energy probe gets high praise

Nature ◽  
2007 ◽  
Author(s):  
Geoff Brumfiel
Keyword(s):  
Dark Energy

The First Galaxies in the Universe

2013 ◽  
Author(s):  
Abraham Loeb ◽  
Steven R. Furlanetto
Keyword(s):  
Galaxy Evolution ◽  
Big Bang ◽  
First Stars ◽  
Distant Galaxies ◽  
Formation And Evolution ◽  
Early Galaxies ◽  
First Galaxies ◽  
Large Telescopes ◽  
New Generation ◽  
The Big Bang

This book provides a comprehensive, self-contained introduction to one of the most exciting frontiers in astrophysics today: the quest to understand how the oldest and most distant galaxies in our universe first formed. Until now, most research on this question has been theoretical, but the next few years will bring about a new generation of large telescopes that promise to supply a flood of data about the infant universe during its first billion years after the big bang. This book bridges the gap between theory and observation. It is an invaluable reference for students and researchers on early galaxies. The book starts from basic physical principles before moving on to more advanced material. Topics include the gravitational growth of structure, the intergalactic medium, the formation and evolution of the first stars and black holes, feedback and galaxy evolution, reionization, 21-cm cosmology, and more.

Editorial [Dark Energy and Modified Gravity]

2010 ◽  
Vol 3 (2) ◽  
pp. 12-12
Author(s):  
S. Nojiri ◽  
S. D. Odintsov
Keyword(s):  
Dark Energy ◽  
Modified Gravity
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