I "Black holes can only get bigger" - huh?

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The discussion centers around the concept that black holes can only grow larger, which is challenged by the existence of Hawking radiation that theoretically allows for black holes to evaporate over an extremely long timescale. Participants clarify that while current models suggest black holes grow through mergers, the effects of Hawking radiation are negligible in the present universe. The conversation also touches on the implications of the second law of thermodynamics in relation to black hole entropy, noting that it does not preclude the possibility of black holes shrinking over time. Additionally, the idea of black holes merging and potentially forming new black holes is debated, with consensus that a black hole cannot exist within another black hole. Overall, the nuances of black hole behavior and theoretical physics are emphasized, highlighting the complexity of the topic.
  • #61
Fra said:
I am guessing that what Peter means is that in these the rules suggest that only "published speculations" should be discussed? not becase they are necessarily right but because it at least prevents random personal and pedestrian speculations from degrading forum quality.
I take care about my posts not degrading a particular thread, especially if mods are involved. Peter has not given a reference to his speculation, and in such situations I conclude this is fine in this context.
 
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  • #62
Fra said:
I am guessing that what Peter means is that in these the rules suggest that only "published speculations" should be discussed?
And even that only in the Beyond the Standard Model forum. Which this isn't.

Granted, any quantum discussion of black holes is kind of borderline here, since we don't have an established theory of quantum gravity. But for purposes of this thread, we are discussing the closest thing to a "standard" model of black hole evaporation, the model originally proposed by Hawking. It's good to be aware that there are issues that have been raised with this model and that there are other proposed models, but if we really want to get into a detailed discussion of those issues we probably need to start a separate thread in the BTSM forum.

Fra said:
not becase they are necessarily right but because it at least prevents random personal and pedestrian speculations from degrading forum quality.
Maintaining the signal to noise ratio of PF is one reason, yes. There are at least two others: first, PF is not a platform for conducting original research, and personal speculations/theories that aren't in the published literature are original research; and second, the published literature at least provides a common basis for discussion.
 

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