Entangled particles inside a black-hole

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Discussion Overview

The discussion revolves around the feasibility of studying black holes through the entanglement of particles, specifically by sending one particle of an entangled pair into a black hole and observing the other particle outside. Participants explore the implications of entanglement and the nature of information in relation to black holes.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants question the possibility of studying black holes by sending entangled particles into them, noting that nothing can escape a black hole, thus making it unclear how one could gather information.
  • Others argue that detecting entanglement requires access to both particles, and if one is inside a black hole, it cannot be observed, leading to random results when measuring the outside particle.
  • A participant mentions that the idea of observing an entangled partner while the other is near the event horizon raises questions about the perception of time and whether the outside particle would "freeze" in time from an observer's perspective.
  • There is a discussion about the nature of entanglement, with some asserting that while entanglement appears instantaneous, it does not allow for faster-than-light communication, which complicates the idea of using it to study black holes.
  • One participant expresses skepticism about the accuracy of information presented in popular media regarding quantum mechanics, emphasizing the complexity of entanglement and the need for careful study.
  • Another participant references the concept of black hole firewalls and the ongoing debate about information loss in black holes, suggesting that this topic is still creating significant challenges in physics.

Areas of Agreement / Disagreement

Participants generally do not agree on the feasibility of using entangled particles to study black holes, with multiple competing views presented regarding the implications of entanglement and the nature of information in this context. The discussion remains unresolved.

Contextual Notes

Limitations include the dependence on definitions of entanglement and information, as well as unresolved questions about the nature of time near a black hole's event horizon.

Mectaresh
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Would it be possible to study black-holes just by entangling particles and sending some of them right into a black-hole?
 
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Mectaresh said:
Would it possible to study black-holes just by entangling particles and sending some of them right into a black-hole?

Since absolutely nothing can come out of a black hole, how would you "study" anything you sent in?
 
Interesting idea, but unfortunately, no. You can only even detect entanglement if you have both partners at hands and look for the specific correlation that comes with entanglement. So for a single system you cannot even tell if it's entangled at all with some remote system, and twice not if that remote system is inaccessibly hidden in a black hole!

Cheers,

Jazz
 
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Mectaresh said:
Would it possible to study black-holes just by entangling particles and sending some of them right into a black-hole?

Are you considering dropping one member of an entangled pair into the black hole and trying to figure out what happen to it by watching the other member outside the black hole? That won't for exactly the same reason that you cannot use entanglement to send faster-than-light (or slower than light, for that matter) signals. If you search this forum you'll find some threads in which this is explained.
 
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Mectaresh said:
Would it possible to study black-holes just by entangling particles and sending some of them right into a black-hole?

Welcome to PhysicsForums, Mectaresh!

You cannot learn anything useful from sending particles into a black hole and measuring its partner outside. You will see only a series of random results. That is the same as if you send the partner into deep space. Or across the lab room for that matter.
 
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Nugatory said:
Are you considering dropping one member of an entangled pair into the black hole and trying to figure out what happen to it by watching the other member outside the black hole? That won't for exactly the same reason that you cannot use entanglement to send faster-than-light (or slower than light, for that matter) signals. If you search this forum you'll find some threads in which this is explained.
Most of my knowledge about quantum mechanics comes from TV shows,I a not trying to argue here,but I am quite sure I heard more than once that only information cannot travel faster than the speed of light and that entanglement is instant.
I must admit that the instantaneous reaction of the entangled particle regardless of the distance that separates it from its partner is the most bizarre and unsettling concept I ever heard of .
I don't understand how is that even possible !
 
DrChinese said:
Welcome to PhysicsForums, Mectaresh!

You cannot learn anything useful from sending particles into a black hole and measuring its partner outside. You will see only a series of random results. That is the same as if you send the partner into deep space. Or across the lab room for that matter.

Thanks for your warm welcome DrChinese,

I have another question on my mind if you don't mind me asking !
I learned that before an object enters the event horizon it sort of freezes in time(from another observer's perspective).
The entangled partner in the lab is technically both observing its partner frozen in time and seeing itself entering the event horizon.
Here is the twisted question:
How would time pass for the entangled partner in lab and most importantly would it be possible to see it freeze in time?
 
Mectaresh said:
Most of my knowledge about quantum mechanics comes from TV shows,I a not trying to argue here,but I am quite sure I heard more than once that only information cannot travel faster than the speed of light and that entanglement is instant.
I must admit that the instantaneous reaction of the entangled particle regardless of the distance that separates it from its partner is the most bizarre and unsettling concept I ever heard of .
I don't understand how is that even possible !

NEVER EVER EVER EVER believe what you hear on TV about science. They get a lot of it right, but they get so much of it WAY wrong that you have to just not trust them about anything.

Information can NOT travel faster than the speed of light. NOTHING can travel faster than c.

Entanglement IS instantaneous, but no information is transmitted and yes, this is REALLY bizarre. I was dumbfounded when I was first introduced to the concept. It's complicated and you need to read up on entanglement to understand it.
 
Mectaresh said:
Would it be possible to study black-holes just by entangling particles and sending some of them right into a black-hole?
that thing is creating a crisis in physics, maybe the information or unitarity is lost, read firewalls.Black Hole Firewalls
https://www.physicsforums.com/showthread.php?t=622022
 
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