• Stanford students are widely known to possess a sense of intellectual vitality. Tell us about an idea or an experience you have had that you find intellectually engaging.
If Doraemon comes from the future, can he travel further back to the past? If time travel is equivalent to space travel in principle, in other words, this activity only involves a body moving along one or multiple dimensions, why can Doraemon see a younger version of himself in the past? Shouldn’t there be only one body of a person at any time at any point in the whole universe?
If any object has only one entity, when we travel back to 1891 and see the Stanford campus, does the present one collapse in that moment? If not, does an object existing for a while make indefinite copies of itself saved in every instant, which can be later referred back to? Does this violate the Principle of Conservation of Energy? If this is the case, is travelling in time to the same spot similar to travelling between different bus stops in no time? That makes the traveler coexist in different places. Does it suggest the possibility of another me existing somewhere else at this moment? Do parallel universes exist?
Coming back to time travel, if a wormhole, a “shortcut” through spacetime, exists, with what material should we build it and how do we stabilize it? If I am brave enough to enter the Schwarzschild wormhole, which will collapse before I exit from the other end, where will I end up be? Do I simply disappear? Where does the energy in my body go?
I got myself totally confused again.
Rules for Time Travelers
http://blogs.discovermagazine.com/cosmicvariance/2009/05/14/rules-for-time-travelers/
