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Theoretical Astrophysics
Theoretical astrophysics
Theoretical Astrophysics is the discipline
that seeks to explain the phenomena observed by astronomers in physical terms.
With this purpose, theoretical astrophysicists create and evaluate models to
reproduce and predict the observations. Theoretical astrophysicists use a wide
variety of tools which include analytical models (for example,
polytropes to approximate the behaviors of a
star)
and
computational
numerical simulations. Each has some advantages. Analytical models of a
process are generally better for giving you insight into the heart of what is
going on. Numerical models can reveal the existence of phenomenon and effects
that you would not otherwise see.
Theorists in astrophysics endeavor to create the simplest
models possible that are in agreement with observations (from
astronomers). Their
models/theories
must make testable predictions. New data can then be gathered which may be
consistent or inconsistent with the theory; in the case of an inconsistency, the
model may be discarded or (as is often the case) new complications are added to
it.
Topics studied by theoretical astrophysics include:
stellar dynamics and
evolution;
galaxy formation; large-scale structure of
matter in the
Universe; origin of
cosmic rays; and
cosmology.
Some widely-accepted theories/models in astrophysics include
the
Big Bang,
Cosmic inflation,
dark matter, and fundamental theories of
physics. For an example of an astrophysical theory (although one which is
not generally accepted by the astrophysical community), see the article
Modified Newtonian Dynamics.
See also:
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