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arxiv 2109.05938 v1 pith:6WD3IBE5 submitted 2021-09-10 math-ph math.MP

Existence of Minimizers for Causal Variational Principles on Compact Subsets of Momentum Space in the Homogeneous Setting

classification math-ph math.MP
keywords compactdefiniteexistencemeasuresminimizersnegativesubsetsclass
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We prove the existence of minimizers in the class of negative definite measures on compact subsets of momentum space in the homogeneous setting under several side conditions (constraints). The method is to employ Prohorov's theorem. Given a minimizing sequence of negative definite measures, we show that, under suitable side conditions, a unitarily equivalent subsequence thereof is bounded. By restricting attention to compact subsets, from Prohorov's theorem we deduce the existence of minimizers in the class of negative definite measures.

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