Does time slow down when falling into a black hole?

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Discussion Overview

The discussion centers around the concept of time dilation in the context of black holes, specifically addressing whether time slows down for an observer falling into a black hole and how this relates to their speed as perceived by outside observers. The scope includes theoretical implications of general relativity and the nature of time in extreme gravitational fields.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants note that as one approaches a black hole, an outside observer would perceive them falling more slowly due to time dilation effects described by general relativity.
  • Others argue that while time appears to slow down for the observer falling into the black hole, their actual speed does not decrease from their own perspective; they would continue to fall at a velocity determined by gravity and their initial conditions.
  • It is mentioned that to the falling observer, time would seem normal, while the universe outside would appear to speed up, leading to the possibility of witnessing cosmic events unfold rapidly.
  • Some participants express confusion about the relationship between time dilation and the physical speed of the falling observer, questioning whether their speed also slows down as perceived by outside observers.
  • A distinction is made that clocks are the primary means of measuring time, and if clocks are running slow, it implies that the time they measure is also running slow.
  • There is a discussion about the implications of time dilation during the Big Bang, suggesting that extreme density could lead to a similar slowing of time, but this is debated in terms of observational perspectives.

Areas of Agreement / Disagreement

Participants generally agree that time dilation occurs in the context of black holes, but there is significant disagreement regarding the implications for the speed of the falling observer. Multiple competing views remain about whether the observer's speed is affected by time dilation as perceived by outside observers.

Contextual Notes

The discussion highlights the complexity of relativity and the subjective nature of time measurement, with participants noting that different frames of reference yield different interpretations of time and speed. There are unresolved questions regarding the relationship between time dilation and physical speed in extreme gravitational fields.

  • #61
what exactly is this hawking radiation??in what way,can that supposedly end
a black hole?
 
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  • #63
the black hole's gravitational pull is tremendous ,so how does it allow hawking radiation
to radiate out of a black hole,even if it is a slow process
 
  • #64
Hawking radiation is a quantum effect. It occurs at the 'surface' of the event horizon. Some photons escape effectively causing the black hole to radiate and eventually [very slowly] decrease in mass. For black solar mass and larger black holes, it will be eons before they actually start to 'shink'. They will absorb more mass than they emit for many billions of years.
 
  • #65
  • #66
so will the mass of a black hole finally become 0,as it shrinks and disappears??can
black holes be considered as perfect black bodies
 
  • #67
Techinically, black holes should explode when they fall below Planck mass. Albeit, a pretty wimpy end to a former bully. A tiny poof of gamma radiation is their legacy. It will, however, take dang near eternity for any such body to evaporate.
 

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