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Bruce A. Bassett (*) and Fabrizio Tamburini(**) 

 	(*)  Department of Theoretical Physics, University of Oxford
                1 Keble Road Oxford OX1 3NP, UK

	(**) Department of Astronomy, University of Padova, 
                vicolo dell'osservatorio, 5  Padova, Italy 


	Grand unified theories (GUT's) may involve many interacting fields with 
	strong coupling dynamics inducing classically chaotic evolution. 
	These theories pose two new problems: 

	(1)  what is the nature of chaotic reheating?
	(2)  how is reheating sensitive to the mass spectrum of these theories ? 

	We answer these questions in two interesting limiting cases and demonstrate
	an increased efficiency of reheating which enhances the possibility of topological 
	defect formation, including monopoles. 
	Nevertheless, the large fluctuations may provide a resolution of the monopole 
	problem via a modified Dvali-Liu-Vachaspati mechanism in which non-thermal 
	destabilsation of discrete symmetries occurs at reheating. 

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Bruce A. Bassett
Fabrizio Tamburini