There are multiple sides to this issue, including the
metaphysical and the
theoretical scientific aspects.
On the theoretical scientific side, relative time travel (in either direction) is plausible with the caveat of certain, specific, not-yet-available technology ( wormhole manipulation and C-scale transportation )
On the metaphysical side, there is the issue of causality. Specifically the question
are past events changable? and if so, how does the universe (as we know it) accommodate those changes? And if not, what would the universe consider an 'event'? And then would any interaction with past events be possible?
A number of authors have written some interesting books (with a wide range of scientific influence) regarding the topic of time travel. Isaac Asimov (my hero, btw) wrote
The End of Eternity, which explains some possible benefits, abuses and mechanisms associated with time travel. It's a good read, too.
The Orson Wells book is one of the few sci-fi books that I think was better as a movie
btw: the relative forces on local time are definitely real and measurable. Even cesium clocks on satellites in non-geosync orbits lose entire milliseconds every year!
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