Name: John B. Smith
Status: Other
Age: N/A
Location: N/A
Country: N/A
Date: N/A
Question:
Assuming the theory that the universe started from a single "point" (big
bang), what caused imperfections during expansion? The question being "How
could galaxies form from singularity?" Singularity is by definition one
dimensional and thus inherently homogeneous.
Replies:
1. It need not be true that the universe started from a point. There exist
solutions to the Einstein's theory which allow an infinite universe and the
universe is infinite from the initial instant onwards. This takes care of
your objection.
2. There are mechanisms which can generate imperfections or inhomogeneities
without violating any known principle of Physics. Once the fluctuations
have been generated, gravity makes sure that large structures can form.
However, gravitation requires large perturbations to begin with as it is a
weak force.
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