[quote=@Bloodtypesuper]
Can different kinds of energy be converted into mana? Like, if mage 1 was in possession of a steady and intense source of heat, could he convert thermal energy into magical energy? I mean, it doesn't violate conservation of energy. The fuel source would eventually run out. However if there was enough energy present it could pay back the energy cost to cast the spell until such a time as it does run out.
[/quote]

It can be done, but only if you know a spell that does this. Heat is fire elemental energy, so skilled fire mages can turn it into mana and absorb it.

[quote=@Bloodtypesuper]
And what about antimatter? How does that factor in? Are there magical effects that could replicate the effects of the substance?
[/quote]

No E = mc^2, so there can't be anything that causes matter-antimatter annihilation like in real life. Nor can there be anything that simply destroys matter while ignoring defensive integrity.

[quote=@Bloodtypesuper]
How would a massive influx of neutrino particles effect magic and hyperspace, if at all?
[/quote]

Neutrinos normally pass through other matter without any effects, in real life, so whatever analogue they have in my universe would be the same. It most likely wouldn't have any effects.