Black holes Definition and 1000 Threads

Super frustrated English major here trying to do calculus! Please help! I'm in way over my head... So, I'm writing this manuscript that involves humans with genetically inherited teleporting abilities. Near the end of the book, my protagonist wants to fling the antagonist close enough to a...

We know light made up of photons which is massless, but why it can absorbed by black hole? Is it becuz the Einstein's relativity about every object can curve time space

Hi, I'm new on here and this is my first post, so forgive me if I don't master the threads instantly :) - right, now that's out of way: I want to open a discussion on the singularity in Black Holes, namely in regards to the well known issue of Special Realitivity breaking down at the...

I have a question about black holes. So imagine that we start putting energy in some region of space, until we reach Schwarzschild radius. We also reach the maximum amount of information we can store in that region of space. Still, the energy continues to collapse in smaller and smaller space...

This may be condensed matter physics topic, but I'm looking for a layperson answer. Scares of the CERN accelerator creating a black hole that swallows Earth are in the news once again. https://www.newsweek.com/earth-shrunk-tiny-hyperdense-sphere-particle-accelerators-1145940 From 10 years ago...

How many are the ways a Black hole without *ACCERTION DISK* can be spotted?

Do black holes accumulate neutrinos ? Do the neutrinos that fall in, decay in some way , maybe interact with the condensed matter, or just stay "parked" in perpetual loops ?

The relative speed of two supermassive black holes moving directly towards each other is 0.999 c. What happens when the two black holes collide directly (so the black holes aren't orbiting each other) at such high velocity? Where does all that energy go and how would it effect space time/what...

From, https://www.syfy.com/syfywire/wham-bullseye-galactic-collision-creates-a-ring-of-black-holes-and-neutron-stars ..."“So you have a nice, normal spiral galaxy, right, just out there doing its thing, when BAM! A smaller galaxy careens right through the middle of it like a bullet! Chaos...

Jacob Bekenstein asserts that the entropy of a black hole is proportional to its area rather than its volume. Wow. After watching Leonard Susskind's video 'The World as a Hologram', it seems to me that he's implying that we are all black hole stuff. Perhaps we (our galaxies and their black...

Speaker : Ashoke Sen ( Harish- Chandra Research Institute, Allahabad, India ) Date and Time : 10 Aug 2009, 04:00 PM Venue : AG 66, TIFR, Mumbai In these lect...

Speaker : Ashoke Sen ( Harish- Chandra Research Institute, Allahabad, India ) Date and Time : 11 Aug 2009, 04:00 PM Venue : AG 66, TIFR, Mumbai In these lect...

Speaker : Ashoke Sen ( Harish- Chandra Research Institute, Allahabad, India ) Date and Time : 12 Aug 2009, 04:00 PM Venue : AG 66, TIFR, Mumbai In these lect...

So when a star collapses, if the event horizon doesn't form, but the object remains in ordinary space, in increasing gravitational time-dilated collapse, what problems with these objects would be solved or more easily addressed? I would think at least the information loss problem, and then there...

ER=EPR, black hole complementary, firewalls, vacuum entanglement etc.. Where do I begin studying these new ideas? I have a solid understanding about Quantum Field Theory and the classical theory of gravity, but no knowledge of string theory. Are there some advice or book recommendations anyone...

According to Special Relativity, objects moving fast have more mass than objects at rest. So what if there is an object having a mass density near that required to create a black hole. Now if it were moving fast enough as well, it would gain enough mass density to become black hole. But to the...

If a black hole that is feeding is actually ingesting the spacetime around it (and hence whatever may lie in that spacetime including light) what does it do when it is not ingesting but nonetheless has very strong gravitational attraction? Does it sit there dragging empty spacetime into it? If...

According to Einstien's theory of evolution, the closer to the speed of light that an object travels, the slower it appears to move to an outside observer. (see https://www.thenakedscientists.com/forum/index.php?topic=40951.0) To take this to the next step once an object crosses the event...

Hi guys I am writing a speech for a school video and I have a maximum of 3 minutes, but I've written 4 minutes and 17 seconds worth of stuff. I need help cutting the fat away giving me around 2 minutes and 45 seconds worth of stuff so that I can have some quick experiments and speak slower so...

I am a hobby reader/listener of pysics, astronomy, special relativity, black holes and more. And a question arose that no amount of YouTube has touched on. Sorry if this is just a stupid question from a hobbist but it truly has me stumped. Or maybe I just have been taught by...

My daughter is 12 and we like to discuss black holes. Here is our thought experiment: Gravity bends space and time lengthening both from the observers perspective. Does time slow down the farther you get from objects with density? Is there a place way way out, out of the range of the Big...

Hi, I am working on a video, and I was wondering if any of you knew of some real-life demonstrations I can do about black holes? So far I have the gravity well, and the balloon covered by foil that you crush to show same mass but denser. My video is about the anatomy of a black hole, so I cover...

well since gravity waves are supposed to have mass, they are supposed to be effected by gravity itself, and :/ how are we supposed to detect gravitational waves emitted from a black hole when none can get out?

Stephen Hawking proposed that black holes will eventually evaporate due to Hawking radiation, thus all information eaten by the black hole is destroyed. This violates basic physics, and hawking soon recanted his views, but there is still no real answer to whether they do or don't destroy...

Disclaimer: to avoid giving the impression of speculative nature, I state the purpose of this thread is only to conflate known theory with my own understanding in a specific point and clarify where the disagreement lies; that is all. TOV limit: since early research in black hole (BH) formation...

I recently re-read an article by Muller (https://arxiv.org/pdf/1606.07975.pdf) about the flow of time, and the possibility of time reversal given sufficient energy dissipation (basically during black hole evaporation, he concludes). Although the paper is on arXiv and not peer reviewed, Muller...

Would it make sense to ask? Is there any other scale for cosmic collisions? What about supernovae? Google is stupid sometimes.

Interesting sidebar in The Week (April 27, 2008, page 20) referencing a BBC.com news items (yeah, I know this is pretty indirect) that says a dozen binary pairs of black hole with orbiting stars have been identified near Sagittarius A by the Chandra X-ray Telescope. They go on to say and that...

Conceptually, at least, this is a simple question, although I recognize that it might be hard to calculate in practice from available data. The matter-energy budget of the universe is measured (in a model dependent way) to consist of a certain percentage of dark energy, a certain percentage of...

I was reading an article about the great Steven Hawking, and it seems to say that matter & anti-matter can be created in space, but that one of them can fall into a black hole, thus leaving the other around in a higher preponderance, which of course matter is. So it would seem that a good...

This is an article about the Indian physicist, Abhas Mitra, who questioned the theory of black holes and the loss of information long before Prof Hawking agreed that there is no Hawking radiation, no exact event boundary and no black hole information paradox...

Hello, Thank you for opening this thread. I am strongly interested in the universe, especially black hole. Though I am only eighteen years old, the more I read books about a black hole, the more my interest is getting powerful. Therefore, I want to know the latest and exciting news about...

Hello, I did read one paper about the Carnot cycle in a black hole. https://arxiv.org/pdf/1404.5982.pdf After formula (15) this paper says: 1) "The vanishing of CV is the “isochore equals adiabat” result, specific to static black holes, making our Carnot cycles particularly simple to make...

The thread https://www.physicsforums.com/threads/how-close-is-earth-to-the-closest-black-hole.939912/ reached a conclusion that there is a 65% confidence level that there is one black hole within 50 ly of Earth. The link http://www.solstation.com/stars/s20ly.htm says there are 25 stars bigger...

Yet the neutron degeneracy pressure is unknown correct? Said size of neutron is a variable? What if we view the pressure as a volume knob, why could not a BH be viewed as a NS with the volume turned up from higher pressure?

Ordinarily a black hole’s Schwarzschild radius is linearly proportional to its mass. However, wouldn’t there be a deviation from this rule for extremely large black holes? Suppose we assume dark energy is due to a cosmological constant, whose value is the same everywhere (including inside the...

https://www.forbes.com/sites/startswithabang/2018/02/14/black-holes-must-have-singularities-says-einsteins-relativity/amp/

If photons are light particles, and they lack mass, how is it possible that they are affected by gravitational pull from a black hole? Super sorry if this has been asked / answered before, I couldn't find it on this forum if it has... Caveat No.2: My physics knowledge was limited to high school...

This is a possible science-fiction scenario, and I'm wondering if it is scientifically plausible. If someone wanted to take a one-way trip into future, say 1000 years from now, then SR gives you a possible way to do it without dying of old age: Just hop in a rocket ship, accelerate to nearly...

After searching elsewhere online I could not find any information about this thought and hope someone may offer some insight. Black holes seem to be generally discussed as having a single entrance point from the event horizon and down into its singularity. I am confused by how quasars have...

As we know the universe is expanding. Could this accelerating expansion contribute or cause black hole evaporation given that the strength of the gravitational force does not depend directly on time, while the distance of two given points in space increases with time? Sorry if my approach is...

I was asked this question... Honestly I do not know! Imagine a black hole. You get sucked inside the singularity Yes, you'd die instantly, but suppose you lived. Where would you end up in space & time if, when inside the singularity, you float to a wall containing it and pierced it and traveled...

If they are infinitely dense than, they would have infinite gravity, so if they have infinite gravity then the universe would have been sucked into a black hole. I was told that black hole has Infinite density so I want to clarify with you guys because it's logically didn't make sense to me.

Hi everyone When a smaller black hole gets sucked into a larger one, is it theoretically possible for the gravity of the larger black hole to stretch the smaller black hole so that it no longer has an infinitely dense centre? I guess it won't matter once they are completely merged, but in...

Primordial Black holes (PBH) need to be collisionless to be considered a serious Dark Matter candidate. Indeed a population of PBH with masses about 30 solar masses and uniformly distributed in the galaxy have very low capture and direct collision rates. But these PBHs should also behave as...

From Wikipedia: Quark-degenerate matter may occur in the cores of neutron stars, depending on the equations of state of neutron-degenerate matter. It may also occur in hypothetical quark stars, formed by the collapse of objects above the Tolman–Oppenheimer–Volkoff mass limit for...

I am reading about Kerr black holes and non rotating black holes. But I am unable to understand what decides whether the black hole will not rotate or rotate. And if No Hair theorem suggests, we can know about a black hole through its angular momentum, what implications does zero angular...

Hi everybody, and thanks in advance. My doubt is: why should the mass go in the singularity? I'm thinking about this situation: imagine a sphere with radius R<2M; then that sphere generates a BH. Schwarzschild tensor metric is valid only in the exterior region of the mass and for this reason i...

I'd like to know people's views on the possibility of Black Holes being 'Gateways' or 'Portals' to parallel universes.

I saw a video of a talk by Susskind discussing his ER = EPR idea. This post isn't actually about that talk, except that it got me thinking about wormholes. Without exotic means, I understand that it is basically impossible to have a traversible wormhole connecting two distant points in space...