Monday, November 28, 2005

The beginning and end of time

If time had a beginning would it have to have an end, and if it has an end would it have to have a beginning?
It seems like if it has an end, it would have to have a beginning. It would be strange for time to just being going along and end all of a sudden. It does seem like it could possibly have a beginning with no end to me though. Does anyone else have any thoughts on this?

Wednesday, November 16, 2005

Sources for Time

The Stanford Encyclopedia of Philosophy contains excellent introductions to problems pertaining to time as well as good sources for further reading:

Tuesday, November 15, 2005

Time Travel and harry Potter

With the release of the fourth Harry Potter book on friday, HBO has beenplaying the third Harry Potter. For those of you who have seen it, it's theone where there Harry and Hermione time travel at the end. Watching this,it got me thinking about time travel in general and wondering if Harry Potterwas a consistent time travel story. The story itself seems to be a consistent time travel story but there's one part which confuses me. When Harry and Hermione finish their time travel story, and by this I mean they arrive back at the "present" time, they see themselves starting their time travel. Wouldn't it be the case that when the new Harry and Hermione arrive at the present time after their time travel journey, they would see another Harry and Hermione embarking on their journey. So, wouldn't there be an infinite amount of Harry and Hermione's and wouldn't there be parallel universes because when harry and Hermione finish their time travel, they go forward in the future, but the Harry and hermione who start their time travel go back in time. What do you think about this? Is time as Matt said, like an infinite amount of frames each one replaying so we are able to go back to it or is it something else?

Friday, November 11, 2005

How would we build a time machine

Nigel said...
This is a question. If time travel were possible, do scientists believe we could ever even approach having the technology capable of sending someone back in time? How would they go about building a "time machine"?
3:17 PM

Tuesday, November 08, 2005

Grandfather Paradox

What I don't like about Lewis' paper is that he says that time travel can'toccur because you can't change the past. But why do you have to change thepast if you time travel? Isn't it feasible that someone just went to thepast, didn't do anything, didn't breathe, didn't move, but just observed.Then, he went back to the future. He time traveled and nothing changed. Whatdo you guys think?

Monday, November 07, 2005

Lewis Time Travel Citation

Hi All,

Here is the citation information for David Lewis's paper on time travel:

Lewis, David. 1976. "The Paradoxes of Time Travel."
American Philosophical Quarterly 13: 145-52. Reprinted in
Lewis, David. 1986. _Philosophical Papers vol II_. Oxford:
Oxford University Press. Pages 67-80.