Trek at 50: The quest for a unifying theory of time travel in Star Trek by Xaq Rzetelny [Ars Technica] [more inside]
The concept of time as a way to measure the duration of events is not only deeply intuitive, it also plays an important role in our mathematical descriptions of physical systems. For instance, we define an object’s speed as its displacement per a given time. But some researchers theorize that this Newtonian idea of time as an absolute quantity that flows on its own, along with the idea that time is the fourth dimension of spacetime, are incorrect. They propose to replace these concepts of time with a view that corresponds more accurately to the physical world: time as a measure of the numerical order of change.
Rules for Time Travelers [Spoiler? alert.]
These subjects still fascinate me after a lifetime of interest: faster-than-light speed, alternate time streams, parallel universes, time travel, antiparticles moving backward in time, time loops, and the recurring themes of paradox -- all serious but astonishing ideas of science. Something about them inspires infinite possibilities. Am I not alone?
Time Travel, or, the art of causing events after they've already happened. [requires java, more inside]
John Cramer is going to conduct an experiment in quantum retrocasuality [ppt] - sending a signal backwards through time
We are hosting the first and only Time Traveler Convention at MIT in one week, and WE NEED YOUR HELP! Anyone plan to attend?
Just how plausable is time travel? Could you go back in time and kill your own grandfather?. Would you want to? Time travel is a popular subject for films, but do the writers work out exactly what is happening? Current opinion seems to be that time travel is only possible to the future, and is only one way, by travelling at near light speed. However despite this, time machines seem to already be on sale.