B Our universe was connected to another universe?

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The discussion centers on a theory suggesting that our universe was once connected to another universe before splitting off billions of years ago. Participants inquire about evidence supporting this theory and reference an old issue of Scientific American that may have discussed it. The mention of "banging branes together" alludes to a humorous take on the theory, linking it to popular culture. However, the conversation concludes with a note that without a valid basis for discussion, the thread is closed. This highlights the challenges in discussing speculative theories without concrete evidence.
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Was our universe once connected to another universe many billions of years ago?
Summary: Was our universe once connected to another universe many billions of years ago?

I read about a theory which states that our universe used to be connected to another universe which somehow split off from it many billions of years ago.

Is there any corroborating evidence to support this?
 
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ElliotSmith said:
I read about a theory

Please give a specific reference.
 
PeterDonis said:
Please give a specific reference.

I think it was an old issue of Scientific American, I can't remember which one, though.
 
Was that the one that gave rise to the quip about 'banging branes together' ?
( Snarky take on Hitchikers Guide's DJ ...)
 
ElliotSmith said:
I think it was an old issue of Scientific American, I can't remember which one, though.

Then we don't have a valid basis for a PF discussion. Thread closed.
 

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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...
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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...
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