The Universe as an Inside-Out Star

Details The Universe as an Inside-Out Star The Universe as an Inside-Out Star

2008-03-30

arxiv.org/abs/0803.4335v1

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures

Scientific paper

Acoustic modes can be used to study the physics of the interior of a cavity, and this is especially useful when the inside region is inaccessible. Many astrophysicists use such sound waves as an essential tool in their research. Here we focus on two separate sub-fields in which oscillations on the surface of a sphere are studied -- Helioseismology and CMBology -- the surface being either the solar or cosmic photosphere. Both research areas use the language of spherical harmonics, as well as sharing many close similarities in the underlying physics. However, there are also many fundamental differences, which we explain in this pedagogical article.

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