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Name: John B. Smith
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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.

Jasjeet S Bagla


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