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Researchers spot black hole feeding at 40x its theoretical limit

arstechnica.com

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Re: Researchers spot black hole feeding at 40x its theoretical limit

#21

Post by YoukaiCountry »

jdonaldson wrote: post #14
aurareturn wrote: post #8

On the topic of black holes, there is a recent paper on black holes potentially converting mass into dark energy: https://iopscience.iop.org/article/10.1088/1475-7516/2024/10... I'm not a physicist but it's interesting to think about the implications: 1. No singularity at the center of a black hole 2. Universe's expansion rate is not constant because it's blackholes powering it with matter 3. Eventually expansion slo…

If that’s the case, why was it a bang instead of a slow leak?

The initial collapse of a star into the black hole would have been the big bang.

Re: Researchers spot black hole feeding at 40x its theoretical limit

#22

Post by machina_ex_deus »

aurareturn wrote: post #8

On the topic of black holes, there is a recent paper on black holes potentially converting mass into dark energy: https://iopscience.iop.org/article/10.1088/1475-7516/2024/10... I'm not a physicist but it's interesting to think about the implications: 1. No singularity at the center of a black hole 2. Universe's expansion rate is not constant because it's blackholes powering it with matter 3. Eventually expansion slo…

The universe is not inside a black hole. Inside black holes the radial coordinate is time like, which is definitely not true in our universe, where the time coordinate is timelike, and the radial coordinate is space like.

Inside of black holes looks nothing like ordinary spacetime. Inside black hole, everything in your future is with decreasing radial coordinate, which means space is shrinking until you hit the singularity where radial coordinate is zero and you have no future.

Re: Researchers spot black hole feeding at 40x its theoretical limit

#23

Post by gus_massa »

MrMcCall wrote: post #16
beastman82 wrote: post #12

Earlier quoted context omitted.

Completely agree and feel the same way about dark energy.

Dark energy is the force that counteracts the combined gravity of our enormous universe. It also keeps the electrons flowing around the nucleus, but not into it. The universe started with a single Big Bang, but is maintained by an interrelated force continually applied that keeps allowing it to resist collapse, the resulting system allowing local minima such as Earth's sweet spot of smallish sun + gentle orbit. It's…

> [Dark energy] also keeps the electrons flowing around the nucleus, but not into it.

That's totaly wrong. The movenent of electrons arround rhe nucleus is explained by the Schoedinger equation that does not use dark energy at all.

Re: Researchers spot black hole feeding at 40x its theoretical limit

#24

Post by dustingetz »

machina_ex_deus wrote: post #22
aurareturn wrote: post #8

On the topic of black holes, there is a recent paper on black holes potentially converting mass into dark energy: https://iopscience.iop.org/article/10.1088/1475-7516/2024/10... I'm not a physicist but it's interesting to think about the implications: 1. No singularity at the center of a black hole 2. Universe's expansion rate is not constant because it's blackholes powering it with matter 3. Eventually expansion slo…

The universe is not inside a black hole. Inside black holes the radial coordinate is time like, which is definitely not true in our universe, where the time coordinate is timelike, and the radial coordinate is space like. Inside of black holes looks nothing like ordinary spacetime. Inside black hole, everything in your future is with decreasing radial coordinate, which means space is shrinking until you hit the singu…

No, this depends on your choice of coordinate system - has been debunked N times on physics reddit in virtually every thread that it comes up. The EH itself is not a singularity in the observers reference frame as they cross it nor do they particularly notice when they do.

Re: Researchers spot black hole feeding at 40x its theoretical limit

#25

Post by leptons »

techjamie wrote: post #19
aurareturn wrote: post #8

On the topic of black holes, there is a recent paper on black holes potentially converting mass into dark energy: https://iopscience.iop.org/article/10.1088/1475-7516/2024/10... I'm not a physicist but it's interesting to think about the implications: 1. No singularity at the center of a black hole 2. Universe's expansion rate is not constant because it's blackholes powering it with matter 3. Eventually expansion slo…

> Maybe the big bang was a result of the birth of another black hole somewhere else, and that the rapid expansion rate of the early universe was due to the a huge amount of matter converted into dark energy by this black hole There is actually a theory that black holes create universes inside them, and that our universe could be underneath countless layers of black holes forming universes that form black holes ad inf…

>There is actually a theory that black holes create universes inside them

Calling it a "theory" is kind of wrong, it's not a "theory" according to the classical definition of the word. The word has been diluted over time to mean any thought anyone has about anything, but it used to mean something that has been proven by observation and empirical evidence. Yes, I'm being pedantic.

>A "classical" definition of a theory refers to a well-established, comprehensive explanation of a phenomenon, based on a body of evidence and often including clearly defined principles or laws, signifying a robust and widely accepted understanding of a subject, as opposed to a mere hypothesis or speculation; essentially, a "theory" in the true scientific sense

>Granted, this is in the realm of science where we have no idea if this is remotely true, but that's part for the course when black holes are involved.

I'm not sure this qualifies as "science". It's more like stoner speculation.

Science is defined as:

>"The systematic study of the structure and behavior of the physical and natural world through observation, experimentation, and the testing of theories against the evidence obtained."

There is no observation, experimentation, or testing of theories that could ever happen for these notions about black holes and the universe(s).

It could be that the universe is a giant egg laid by a giant chicken, and that is just as plausible as "black holes create universes inside them" as far as we know.

Re: Researchers spot black hole feeding at 40x its theoretical limit

#26

Post by cowsup »

duerra wrote: post #7

I think once we finally get this all sorted out, future humans will find it hilarious that so many people were convinced that dark matter was real and particles we could not detect made up 80% of the universe.

I find such thoughts exciting. In the future, children will be taught basic facts that, to us in the first half of the 21st century, are some of the most complicated questions of the universe.

Re: Researchers spot black hole feeding at 40x its theoretical limit

#27

Post by machina_ex_deus »

dustingetz wrote: post #24
machina_ex_deus wrote: post #22

Earlier quoted context omitted.

The universe is not inside a black hole. Inside black holes the radial coordinate is time like, which is definitely not true in our universe, where the time coordinate is timelike, and the radial coordinate is space like. Inside of black holes looks nothing like ordinary spacetime. Inside black hole, everything in your future is with decreasing radial coordinate, which means space is shrinking until you hit the singu…

No, this depends on your choice of coordinate system - has been debunked N times on physics reddit in virtually every thread that it comes up. The EH itself is not a singularity in the observers reference frame as they cross it nor do they particularly notice when they do.

I never said EH is a singularity. I said you could notice you're inside as your timelike coordinate becomes the radial coordinate. That's something you could easily notice if you look around, it would correspond to a shrinking universe, and our universe is expanding.

The "you won't notice crossing the event horizon" troupe is true only in a very local sense. If you move around and observe the geometry around you, you can definitely tell you're inside a black hole.

Re: Researchers spot black hole feeding at 40x its theoretical limit

#28

Post by bryanrasmussen »

prettyStandard wrote: post #15
aurareturn wrote: post #8

On the topic of black holes, there is a recent paper on black holes potentially converting mass into dark energy: https://iopscience.iop.org/article/10.1088/1475-7516/2024/10... I'm not a physicist but it's interesting to think about the implications: 1. No singularity at the center of a black hole 2. Universe's expansion rate is not constant because it's blackholes powering it with matter 3. Eventually expansion slo…

It's not crazy. I'm no physicist, but I understand the math of the Big bang is similar to that of a White hole. What gets a little mind bending for me is the idea that the physics inside the black hole can differ slightly from the ancestor universe. So black holes will preferentially create descendant universes that prefer to create more black holes. This is a different multiverse theory than the quantum many worlds…

According To Tegmark's reasoning the MCU could be out there, black holes not a prerequisite but

"there are all sizes of infinity, some infinities are bigger than others. The infinity of Real numbers is bigger than the infinity of all positive numbers, and it should be noted that while the infinity of all positive numbers is infinite the number 3 only shows up in it once."

https://medium.com/luminasticity/the-marvel-cinematic-multiv...

Re: Researchers spot black hole feeding at 40x its theoretical limit

#29

Post by [deleted] »

aurareturn wrote: post #8

On the topic of black holes, there is a recent paper on black holes potentially converting mass into dark energy: https://iopscience.iop.org/article/10.1088/1475-7516/2024/10... I'm not a physicist but it's interesting to think about the implications: 1. No singularity at the center of a black hole 2. Universe's expansion rate is not constant because it's blackholes powering it with matter 3. Eventually expansion slo…

[deleted]

Re: Researchers spot black hole feeding at 40x its theoretical limit

#30

Post by jdhwosnhw »

MrMcCall wrote: post #16
beastman82 wrote: post #12

Earlier quoted context omitted.

Completely agree and feel the same way about dark energy.

Dark energy is the force that counteracts the combined gravity of our enormous universe. It also keeps the electrons flowing around the nucleus, but not into it. The universe started with a single Big Bang, but is maintained by an interrelated force continually applied that keeps allowing it to resist collapse, the resulting system allowing local minima such as Earth's sweet spot of smallish sun + gentle orbit. It's…

> It also keeps the electrons flowing around the nucleus, but not into it.

Asa cautionary note to other readers, this statement is not consistent with any theory of which I am aware, and it’s certainly not a concept accepted by mainstream physics

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