This is a little theory i put together a few months ago when i was explaining to my girlfriend how black holes can be used for time travel-

Now, most people know about Hawking radiation (okay, maybe only most physics nuts know about it), the process whereby a black hole evaporates via the creation of a particle/antiparticle pair at the event horizon, and the antiparticle falls in.

However, gravitational distortion surrounding the black hole produces time dilation in accordance with general relativity, which prevents any particle from crossing the event horizon in a finite time frame.

So, theoretically, the antiparticle produced by the hawking radiation process would never actually cross the event horizon of the black hole in a finite absolute time frame, meaning that the mass of the black hole remains constant.

Can anyone see any glaring flaws in this theory? I couldn't find anyone to peer-review the idea, so i thought to post it here any let TLR's theoretical physics buffs rip it to pieces