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topic of BH ringing freq. came up in "Loop Quantum Gravity" thread in SringBraneLQG forum.
I'm starting this thread here in hopes that some regulars here (Labguy, Nereid, others?) can shed additional light.
From a pedagogical or intuitive point of view it seems to bring the topic closer to home to notice that the ringing frequency of an ordinary BH with mass of sun would be an actual recognizable pitch in the soprano range.
A BH with four to five solar masses would ring with a frequency around middle D, which is near the high end of the bass range, so I could sing it.
The first major paper about this was Shahar Hod
http://arxiv.org/gr-qc/9812002
and two occasional PFers have contributed
(Lubos Motl, Andy Neitzke)
to what is a growing bunch of papers on BH "quasinormal modes"
But my focus here is not on "what's the latest and greatest news
about BH vibrations?" but rather just getting used to them
in a down-home way.
In the literature the prevailing practice is to use ANGULAR FORMAT for
frequencies----the symbol being omega instead of f. This in itself
takes a little getting used to.
It means that the A above middle C on the piano is 880pi
instead of 440.
But there are longterm benefits to getting accustomed to thinking frequencies in angular format (like, you get to use hbar whenever you want)
I'm starting this thread here in hopes that some regulars here (Labguy, Nereid, others?) can shed additional light.
From a pedagogical or intuitive point of view it seems to bring the topic closer to home to notice that the ringing frequency of an ordinary BH with mass of sun would be an actual recognizable pitch in the soprano range.
A BH with four to five solar masses would ring with a frequency around middle D, which is near the high end of the bass range, so I could sing it.
The first major paper about this was Shahar Hod
http://arxiv.org/gr-qc/9812002
and two occasional PFers have contributed
(Lubos Motl, Andy Neitzke)
to what is a growing bunch of papers on BH "quasinormal modes"
But my focus here is not on "what's the latest and greatest news
about BH vibrations?" but rather just getting used to them
in a down-home way.
In the literature the prevailing practice is to use ANGULAR FORMAT for
frequencies----the symbol being omega instead of f. This in itself
takes a little getting used to.
It means that the A above middle C on the piano is 880pi
instead of 440.
But there are longterm benefits to getting accustomed to thinking frequencies in angular format (like, you get to use hbar whenever you want)
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