Jets from Black Holes - do they carry momentum?

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Discussion Overview

The discussion centers on whether jets emitted from black holes carry momentum and the implications of this on the black hole's properties. It touches on concepts related to black hole mechanics, the nature of jets, and the surrounding accretion disks, as well as speculative ideas about space-time.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions if jets from black holes carry momentum and whether the matter in these jets is rotating or carries spin.
  • Another participant expresses uncertainty about the concept of 'creating space-time' and hopes to observe closed time-like loops in the universe.
  • A participant asserts that jets from active galactic nuclei (AGN) do carry momentum, noting the complexity of the AGN system, which includes the black hole and its accretion disk. They explain that while the black hole gains energy and momentum through accretion, some energy is lost through the jets.
  • One participant inquires if black holes can consume space-time.
  • A response clarifies that while black holes can consume mass and energy, they do not consume space-time as it is a mathematical construct.

Areas of Agreement / Disagreement

Participants express differing views on the nature of black holes and their interaction with space-time, with some agreeing that jets carry momentum while others raise questions about the nature of space-time itself. The discussion remains unresolved regarding the implications of these concepts.

Contextual Notes

There are limitations in the discussion regarding the definitions of space-time and the efficiency of energy conversion in black holes, which remain unresolved.

Dmitry67
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Q: do jets from Black Holes carry away the momentum from Black holes - in any form?
Is matter in these jets rotating?
Or may be particles carry the same spin?
 
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I don't know what do you mean by 'creating space time'.
But I do hope that a least some of the BH are super-extreme
I would be happy to see Closed Time-like loops in the observable universe
 
The jets from black holes in say Active Galactic Nuclei (AGN) certainly do carry momentum. However, the whole system of an AGN is complex. You have the central black hole which has its mass and angular momentum, but then you also have a lot of energy and momentum contained in the material around the black hole, the `accreation disk' that is falling in. So, in fact the black hole continues to gain energy and momentum via accreation, while some is lost in the jets. Essentially accreation is not 100% efficient in terms of converting all the energy (internal and gravitational) of the surrounding material into the black hole. In fact most of it is shed in the form of the jets or other radiation.

So, yes the jets carry away momentum and energy, but not that of the black hole.
 
is it possible that BH consume space time ?
 
Space-time is a mathematical construct that let's you calculate the graviational influence of gravitating bodes on other bodies. Black holes can consume things that exist, such as anything with mass or energy, but not 'space-time'.
 
thank you
 

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