Where Has All the Antimatter Gone Since the Big Bang?

AI Thread Summary
The discussion centers on the apparent absence of antimatter in the observable universe despite theories suggesting equal amounts were created during the Big Bang. Participants question why there hasn't been a second Big Bang, given that matter and antimatter are highly explosive upon collision. The prevailing conclusion is that large amounts of antimatter do not exist in the observable universe, as evidence of annihilation effects would likely be detected otherwise. Some suggest that antimatter may exist in the vast spaces between galaxies, where it could remain undetected. This raises further questions about the fundamental nature of matter and antimatter in the universe.
hexhunter
Messages
100
Reaction score
0
if matter and anti-matter are highly explosive when they collide, then how come there hasn't been a second big bang?

where has all the anti-matter gone, if there were equal amounts for the big bang, then why is there matter, but apparently no anti-matter

sorry if i got something wrong here
 
Space news on Phys.org
The conclusion that there are no large amounts of antimatter in the observable universe is that, if we assume the contrary, chances are we would have seen some kind of effects of annihilation from time to time. Although, from my understanding of the explanation, it is assuming alot.
 
Because most of the antimatter is in between the places with concentrations of matter - the expanses between galaxies
 

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 'Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".'

The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
View full post »

Thread 'Hubble Constant, Dark Energy and the Expanding Universe'

Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
View full post »

Similar threads

B Is there any kind of anti-matter "problem"?
Replies
1
Views
1K
I Questions about the Location of the Big Bang and the Age of the Universe
Replies
8
Views
3K
B Big Bang Question -- How was the first matter formed?
2
Replies
69
Views
6K
B Could Matter/Anti-Matter Annihilation Explain Dark Energy and Dark Matter?
Replies
7
Views
2K
B Why do we assume the big bang created matter/antimatter?
Replies
2
Views
2K
I Does the Cosmological Principle in any way underpin Big Bang Theory?
Replies
33
Views
3K
B Big Bang and Infinite Universe
Replies
20
Views
1K
B Did the Big Bang follow multiple bangs? How did matter come to collide?
Replies
43
Views
5K
I How we are in a matter dominated universe (without antimatter annihilation)
Replies
13
Views
2K
Matter vs Anti-Matter: What Survived the Big Bang?
Replies
9
Views
4K

Hot Threads

Recent Insights

Back
Top