Re: Star chime could reveal small black holes



Sam Wormley <swormley1@xxxxxxxxx> wrote in
news:98idncuUuenM6fPTnZ2dnUVZ_uMAAAAA@xxxxxxxxx:

Star chime could reveal small black holes
http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.107.111101

"In theory, black holes come in all sizes, not just the star- and
galaxy-scale objects that astronomers have already seen. In particular,
smaller ?primordial? black holes might have formed from density
fluctuations in the first seconds after the big bang. In addition to
providing a window into the universe in its earliest moments, these
remnants could be the cold dark matter that makes up about a quarter of
its present mass.

"Previous observations rule out abundant black holes smaller than 10^-16
or larger than 10^-7 times the mass of the sun, but intermediate sizes
could still account for cold dark matter. In Physical Review Letters,
Michael Kesden at New York University and Shravan Hanasoge at Princeton
University, New Jersey, propose that these medium-sized black holes
could be detected when they pass through a star. Although the black hole
will hardly be affected, it will leave lingering acoustic vibrations in
the star, analogous to the ringing of a bell".

See: http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.107.111101



Acoustic vibrations in a star as a search for primordial black holes?

That is the same idea as using vibrational modes of Earth as a hunt for
gravitational waves. Nice sounding in theory, but will never work in
reality.
.



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