Finite temperature instantons - so called calorons - are considered in 4-dimensional pure Yang-Mills theory. Exact solutions are found along with zero-modes of the associated Dirac operator and the... Show moreFinite temperature instantons - so called calorons - are considered in 4-dimensional pure Yang-Mills theory. Exact solutions are found along with zero-modes of the associated Dirac operator and the moduli space of all solutions is described. Show less