Which branch of physics is the most fundamental one?

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I argue that 'truth' is a very ambiguous word that has a lot of emotional connotation.
 
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Loren Booda said:
Quantum cosmology.

It seems to be interesting branch. Is this sexy, competetive field with no funds and perspectives for interesting reaserch or does it depend on speciality?
 
Quantum cosmology is a fundamental field for the future, relating diametric extremes of physics. For instance, there have been inroads on how one might explore the Planck realm indirectly (Physics Today).