I Voids, dark energy and tidal forces...?

AI Thread Summary
The discussion focuses on the relationship between dark energy and the characteristics of cosmic voids, particularly their ellipticity and the influence of tidal forces. The authors of the referenced studies suggest that dark energy impacts the shape and evolution of voids, potentially increasing their ellipticity. This raises questions about whether dark energy also intensifies tidal forces within these voids. Clarification is sought on whether a higher density of dark energy correlates with stronger tidal forces affecting voids. Understanding this relationship could enhance insights into the dynamics of the universe's expansion.
Suekdccia
Messages
352
Reaction score
30
TL;DR Summary
Voids, dark energy and tidal forces...?
I would like to ask you some questions I have about some interesting work I was reading (https://arxiv.org/abs/1205.4238 & https://academic.oup.com/mnras/article/527/4/11962/7457744) where the authors analysed the effects of dark energy in the shape and evolution of voids

Apparently, they established a relation between dark energy, voids' ellipticity and tidal forces. I have a question about this, since it was not entirely clear to me:

Does it mean that dark energy (or the accelerated expansion of the universe) contributes to increase the ellipticity of voids? Then, does dark energy increase the tidal forces of the void (so that a greater dark energy density in the universe would result in more intense tidal forces in the void)?
 

Thread 'Illuminating Black Hole Shadows with Dark Matter Annihilation'

Abstract The Event Horizon Telescope (EHT) has significantly advanced our ability to study black holes, achieving unprecedented spatial resolution and revealing horizon-scale structures. Notably, these observations feature a distinctive dark shadow—primarily arising from faint jet emissions—surrounded by a bright photon ring. Anticipated upgrades of the EHT promise substantial improvements in dynamic range, enabling deeper exploration of low-background regions, particularly the inner shadow...
View full post »

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
View full post »

Thread 'If the Universe has a cause, what caused that cause?'

Title: Can something exist without a cause? If the universe has a cause, what caused that cause? Post Content: Many theories suggest that everything must have a cause, but if that's true, then what caused the first cause? Does something need a cause to exist, or is it possible for existence to be uncaused? I’m exploring this from both a scientific and philosophical perspective and would love to hear insights from physics, cosmology, and philosophy. Are there any theories that explain this?
View full post »

Similar threads

I The Evolution of Galactic Scale Cosmic Voids
Replies
1
Views
3K
A Models without dark energy
Replies
29
Views
2K
I Tidal effects of galaxies orbiting one another with dark energy?
Replies
2
Views
2K
I Avoiding structure collapse due to dark energy?
Replies
3
Views
2K
I Photons being blueshifted when crossing evolving voids?
Replies
0
Views
2K
I Questions on the consequence of an evolving dark energy parameter
Replies
1
Views
1K
I Dark energy contributing to, or modifying, mass estimates?
Replies
1
Views
2K
I Dark energy and the kinematic Sunyaev-Zeldovich effect?
Replies
22
Views
2K
I Dark Energy contribution to plasma temperature in galaxy clusters?
Replies
7
Views
2K
I Does dark-energy require a source of energy?
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top