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Re: What exactly is a black hole?

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On 2/18/2019 9:31 AM, sam.wormley@gmail.com wrote:
> What exactly is a black hole?
> 
> "What is a black hole? In an article that has just appeared in the journal Nature Astronomy, LMU philosopher Erik Curiel shows that physicists use different definitions of the concept, depending on their own particular fields of interest.
> 
> "A black hole is conventionally thought of as an astronomical object that irrevocably consumes all matter and radiation which comes within its sphere of influence. 

nope.  it is simply that the escape velocity is c.

Physically, a black hole is defined by the presence of a singularity,
i.e., a region of space, bounded by an 'event horizon', within which the
mass/energy density becomes infinite, and the normally well-behaved laws
of physics no longer apply.

nope. not infinite, one can weigh black holes by the orbiting stars
around it.

>However, as an article in the January issue of the journal Nature Astronomy demonstrates, a precise and agreed definition of this 'singular' state proves to be frustratingly elusive. Its author, Dr. Erik Curiel of the Munich Center for Mathematical Philosophy at LMU, summarizes the problem as follows: "The properties of black holes are the subject of investigations in a range of subdisciplines of physics – in optical physics, in quantum physics and of course in astrophysics. But each of these specialties approaches the problem with its own specific set of theoretical concepts."

> 
> "Erik Curiel studied philosophy as well as theoretical physics at Harvard University and the University of Chicago, and the primary aim of his current DFG-funded research project is to develop a precise philosophical description of certain puzzling aspects of modern physics. 

"philosphical" ?   so, it is more BS ?

>"Phenomena such as black holes belong to a realm that is inaccessible to observation and experiment. Work based on the assumption that black holes exist therefore involves a level of speculation that is unusual even for the field of theoretical physics." 

nope, escape velocity is c.   not unusual, follows simple math.

>However, this difficulty is what makes the physical approach to the nature of black holes so interesting from the philosophical point of view. "The physical perspective on black holes is itself inextricably bound up with philosophical issues relating to ontological, metaphysical and methodological considerations," says Curiel."


BULLSHIT ALARM !!

"ontological, metaphysical and methodological considerations"

cut that guys funding off now!

> 
> 
> Read more at: https://phys.org/news/2019-02-black-hole.html#jCp
> 

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What exactly is a black hole? sam.wormley@gmail.com - 2019-02-18 07:31 -0800
  What exactly is a black hole? john <johnsefton288@gmail.com> - 2019-02-18 07:53 -0800
  600 trillion Suns bright, 12.8 billion years old. Jeff-Relf.Me  @. - 2019-02-18 12:31 -0800
    Re: 600 trillion Suns bright, 12.8 billion years old. pnalsing@gmail.com - 2019-02-18 18:02 -0800
      600 trillion Suns bright, 12.8 billion years old. Jeff-Relf.Me  @. - 2019-02-18 22:23 -0800
        Re: 600 trillion Suns bright, 12.8 billion years old. Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2019-02-19 10:28 +0000
        695 trillion suns, 12.5 billion years ago. Jeff-Relf.Me  @. - 2019-02-21 04:21 -0800
          695 trillion suns, 12.5 billion years ago. Jeff-Relf.Me  @. - 2019-02-21 06:32 -0800
  Re: What exactly is a black hole? Alan Folmsbee <omnilobe@gmail.com> - 2019-02-18 12:47 -0800
  Re: What exactly is a black hole? Serg Io <invvalid@invalid.com> - 2019-02-18 15:40 -0600
    Re: What exactly is a black hole? mitchrae3323@gmail.com - 2019-02-18 13:58 -0800
      Re: What exactly is a black hole? Serg Io <invvalid@invalid.com> - 2019-02-18 16:17 -0600
        Re: What exactly is a black hole? mitchrae3323@gmail.com - 2019-02-19 13:17 -0800
          Re: What exactly is a black hole? Serg Io <invvalid@invalid.com> - 2019-02-19 20:58 -0600
    Re: What exactly is a black hole? benj <benj.fake@gmail.com> - 2019-02-18 19:52 -0500
    Re: What exactly is a black hole? pnalsing@gmail.com - 2019-02-18 18:09 -0800
      Re: What exactly is a black hole? Serg Io <invvalid@invalid.com> - 2019-02-18 23:11 -0600
        Re: What exactly is a black hole? pnalsing@gmail.com - 2019-02-18 21:28 -0800
        Re: What exactly is a black hole? "Chris M. Thomasson" <invalid_chris_thomasson_invalid@invalid.com> - 2019-02-18 22:45 -0800
  Re: What exactly is a black hole? Double-A <double-a3@hush.com> - 2019-02-19 14:15 -0800
    Re: What exactly is a black hole? "Chris M. Thomasson" <invalid_chris_thomasson_invalid@invalid.com> - 2019-02-21 13:45 -0800
      Re: What exactly is a black hole? sam.wormley@gmail.com - 2019-02-21 14:24 -0800
        Re: What exactly is a black hole? john <johnsefton288@gmail.com> - 2019-02-21 16:42 -0800

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