Lawrence Krauss: Observing a Baby Universe's Expansion

  • Thread starter Thread starter Routaran
  • Start date Start date
  • Tags Tags
    Expansion
Routaran
Messages
447
Reaction score
94
Lawrence Krauss Lecuture: What a baby expanding universe may look like from "outside"

I watched a lecture by Krauss a while back


one of the questions that was asked near the end was that if it was possible that quantum fluctuations could produce a baby universe within our own and if we'd be able to observe this.

Part of Krauss' response was that from inside this baby universe would be exponentially expanding but from outside it will look like it was collapsing to form a black hole so we wouldn't be completely sure.

my question is, why would this baby universe appear like a collapsing black hole?
 
Last edited by a moderator:
Space news on Phys.org


bump!
 


Not sure. That's one I've never heard of before. Perhaps something to do with the way spacetime warps inside a black hole?
 


Read The Inflationary Universe by Alan Guth he discusses this issue
 

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 'Big Bang and Infinite Universe'

Hi, I’m pretty new to cosmology and I’m trying to get my head around the Big Bang and the potential infinite extent of the universe as a whole. There’s lots of misleading info out there but this forum and a few others have helped me and I just wanted to check I have the right idea. The Big Bang was the creation of space and time. At this instant t=0 space was infinite in size but the scale factor was zero. I’m picturing it (hopefully correctly) like an excel spreadsheet with infinite...
View full post »

Similar threads

B Is the Big Bang only about the observable Universe?
Replies
6
Views
3K
B Why doesn't cosmic inflation violate conservation of energy?
Replies
3
Views
3K
B Conflict between the conservation of matter and the rapid expansion of our universe
Replies
18
Views
723
B Cosmological Redshift in Simulated Universe
Replies
39
Views
5K
I 3 questions about a paper on density fluctuations in the Universe
Replies
1
Views
2K
A Black hole mass coupled to expansion -- astrophysical source of dark energy?
3
Replies
134
Views
10K
I How do you get to the conclusion that there is accelerating expansion?
Replies
23
Views
2K
I Why didn't the Big Bang form a Black Hole?
Replies
7
Views
3K
Does Michio Kaku agree with Lawrence Krauss' concept of nothingness?
Replies
1
Views
2K
I Density fluctuations in a homogeneous linearly expanding universe?
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top