/sci/ - Science & Math

>>11757642
https://en.wikipedia.org/wiki/Hartle%E2%80%93Hawking_state

https://en.wikipedia.org/wiki/Zero-energy_universe

>>11742592
This is correct. There are some attempts to explain even the initial state itself, but these theories are much more controversial.

https://en.wikipedia.org/wiki/Hartle%E2%80%93Hawking_state

https://en.wikipedia.org/wiki/Zero-energy_universe

>>11684639
>>no explanation as to why it’s expanded

https://en.wikipedia.org/wiki/Inflation_(cosmology)

https://en.wikipedia.org/wiki/Eternal_inflation

https://en.wikipedia.org/wiki/Zero-energy_universe

https://www.preposterousuniverse.com/blog/2010/02/22/energy-is-not-conserved/

>>no explanation as to where the singularity even came from

https://en.wikipedia.org/wiki/Hartle%E2%80%93Hawking_state

>>11650958
Excellent posts

>we don't really know when it began or even if it had a beginning. It may have, and there are some ideas about what got it started. But it's also possible that inflationary expansion is the default state of the greater universe-- I should say multiverse at this point. This is the idea of eternal inflation.

As far as I know, eternal inflation is only eternal and self-sustaining into the future (and indeed may have been ongoing for a very long time by the time it created our local universe), but it is not eternal into the past. Due to entropy it still must have a beginning. Something like this maybe:

https://en.wikipedia.org/wiki/Hartle%E2%80%93Hawking_state

>>11615050
>Why is there something instead of nothing?

https://journals.aps.org/prd/abstract/10.1103/PhysRevD.28.2960

https://ncatlab.org/schreiber/files/Emergence170208.pdf

>>11178710
https://en.wikipedia.org/wiki/Hartle%E2%80%93Hawking_state

https://en.wikipedia.org/wiki/Eternal_inflation

>>11117616
>>11119212
this

>>11081409
https://en.wikipedia.org/wiki/Hartle%E2%80%93Hawking_state

>Hartle and Hawking suggest that if we could travel backwards in time towards the beginning of the Universe, we would note that quite near what might otherwise have been the beginning, time gives way to space such that at first there is only space and no time. According to the Hartle–Hawking proposal, the Universe has no origin as we would understand it: the Universe was a singularity in both space and time, pre-Big Bang. Thus, the Hartle–Hawking state Universe has no beginning, but it is not the steady state Universe of Hoyle; it simply has no initial boundaries in time or space.

>>10979668
ttps://en.wikipedia.org/wiki/Zero-energy_universe

>>10932581
Big Bang theory does not say something came from nothing at all.

>>10887504

>>10877393
https://en.wikipedia.org/wiki/Zero-energy_universe

https://en.wikipedia.org/wiki/Hartle%E2%80%93Hawking_state