Research suggests Big Bang may have taken place inside a black hole • Hacker News Board

Re: Research suggests Big Bang may have taken place inside a black hole

#301

Post by daedrdev » Wed, Jun 11, 2025, 10:58 PM UTC

DrammBA wrote: post #275

timewizard wrote: post #258

Earlier quoted context omitted.

> As the size of the black hole goes up, its overall density must decrease. The center of a black hole is infinitely dense. That's why it even exists. The event horizon is not the black hole. > and the fixed density of our observed universe Our universe is expanding. It's density is not fixed. You really want to be thinking about this in terms of entropy and not matter.

> The center of a black hole is infinitely dense. That's why it even exists. The event horizon is not the black hole. Arguing semantics is rather boring when it's obvious you understood the point he was trying to make. > Our universe is expanding. It's density is not fixed. None of that precludes uniform density at large scales.

I think a point they are trying to make is that the border of a black hole is only to us outside observers, if you yourself fell into one you wouldn't notice anything specific when you crossed the boundary. The popular example of hawking radiation references a border and pairs of particles, however its actually only to help people understand the idea of what is going on

Re: Research suggests Big Bang may have taken place inside a black hole

#302

Post by alkyon » Wed, Jun 11, 2025, 11:03 PM UTC

fracus wrote: post #182

carbocation wrote: post #24

I think it's neat that this summary is written by an author of the scientific manuscript. Oversimplification is a risk, but this approach eliminates the possibility that the writer did not understand the underlying science.

Yeah, wow. That was great. His solution seems so simple and clears all the previous model's problems. I guess every black hole could contain its own universe.

I would be surprised if the size doesn't matter in this case. On the one hand, tiny black holes tend to be rather short-lived. On the other, I suppose some threshold mass/energy is needed to generate a child universe that doesn't collapse immediately.

Re: Research suggests Big Bang may have taken place inside a black hole

#303

Post by leereeves » Wed, Jun 11, 2025, 11:03 PM UTC

lukas099 wrote: post #265

johnisgood wrote: post #236

Earlier quoted context omitted.

Most jobs are really not important either, they just keep people busy. Do you need sources for this claim, too?

Yes. Who are these people paying for jobs that don't do anything, and why are they more concerned about "keeping people busy" than their own profits?

Most people involved like hiring more people.

Workers generally like jobs where the workload is low. Managers gain status by having bigger teams, whether they need the extra people or not. Even investors often prefer hiring (a sign of growth) to layoffs, and executives are mostly concerned with pleasing investors.

Even well run tech companies with money to burn hired more people than they needed.

Re: Research suggests Big Bang may have taken place inside a black hole

#304

Post by mewpmewp2 » Wed, Jun 11, 2025, 11:04 PM UTC

largbae wrote: post #295

mewpmewp2 wrote: post #289

Earlier quoted context omitted.

As an agnostic I agree, but none the less it is a whole, absurd joke to be here without any answers and I demand someone to answer me.

We apologize for the inconvenience.

This needs to be escalated. Who is your manager?

Re: Research suggests Big Bang may have taken place inside a black hole

#305

Post by daedrdev » Wed, Jun 11, 2025, 11:05 PM UTC

belter wrote: post #207

daedrdev wrote: post #166

Earlier quoted context omitted.

Predicting inflation rates may be harder than discovering the birth of the universe actually, because it would require perfect knowledge of the present and by the time you compute it it's out of date.

We can claim to simulate the first femtoseconds of the universe...model nuclear detonations in software down to quantum effects....but 340 million citizens buying gas and groceries? That’s somehow beyond our grasp... :-) Maybe the problem isn’t complexity, but that science gets arrogant when it drifts into realms where its claims can’t be falsified ;-)

The beginning of the universe is a start state we have theories about, that we can apply our system of physic to calculate once. A computer that calculates an economy might violate the halting problem because it would need to know when it itself is finished to calculate its own electricity costs, as well as every other algorithm in an economy.

Re: Research suggests Big Bang may have taken place inside a black hole

#306

Post by TheOtherHobbes » Wed, Jun 11, 2025, 11:10 PM UTC

Which suggests that:

1. You can have black holes inside black holes.

2. Potentially each black hole is a universe - although some are much smaller and less interesting than others.

Re: Research suggests Big Bang may have taken place inside a black hole

#307

Post by kannanvijayan » Wed, Jun 11, 2025, 11:30 PM UTC

nathan_compton wrote: post #203

kannanvijayan wrote: post #94

Oh I have so many questions on this topic. I've often wondered about this. I don't have any direct physics training, but it's something that felt really plausible after I learned that the mass of a black hole is linearly proportional to its swarzschild radius. As the size of the black hole goes up, its overall density must decrease. Combined with the other observation that our universe has uniform density at large sc…

> It somehow feels more appropriate to me to think of dark energy as energy being extracted out of the universe, in some form never to return. Maybe like a black hole evaporating as observed from the inside? But in this story the black hole increases in size as matter falls into the horizon and shrinks as it evaporates, so cosmic expansion would be associated with more energy falling into the black hole than leaving…

I thought about this part. I'm not sure we can link apparent size from outside the event horizon to apparent size from inside.

Apparent distance is something that's affected by relative frames of reference and the frames of reference are as different as as can be in this case.

Re: Research suggests Big Bang may have taken place inside a black hole

#308

Post by hateful » Wed, Jun 11, 2025, 11:33 PM UTC

I've always had this idea that perhaps the whole universe had already collapsed into many black holes and perhaps each galaxy was actually formed via hawking radiation. Then our galaxy came out of Sagittarius A*.

Re: Research suggests Big Bang may have taken place inside a black hole

#309

Post by [deleted] » Wed, Jun 11, 2025, 11:34 PM UTC

afarah1 wrote: post #196

Interesting read, but even if we assume the author is correct, and the cosmos formed as a black hole in a larger universe, the question remains, how did this larger universe formed, then? Might just be impossible to know.

[deleted]

Re: Research suggests Big Bang may have taken place inside a black hole

#310

Post by coliveira » Wed, Jun 11, 2025, 11:35 PM UTC

EasyMark wrote: post #229

coliveira wrote: post #54

Earlier quoted context omitted.

"beginning" is a misnomer, since time itself started with the Big Bang. There is no such thing as "before" the singularity, as time and space were curved together.

There are many theories that portray time as existing before the big bang.

Well, do the calculations of how long it takes for all mass to move around in the initial moments of the big bang. You'll realize that the closer one gets to the singularity, the slower time passes due to time dilation, which means that you'll get the whole eternity to reach the singularity. It only looks like a few seconds from our point of view, looking at the big bang.