1. Time Travel

2. Time travel is the concept of moving between different
points in time. Time travel could involve moving
backward in time to a moment earlier than the starting
point, or forward to the future of that point without the
need for the traveller to experience the intervening
period (at least not at the normal rate).
Time travel has been a common plot in science fiction.
The theories of special and general relativity allow
methods for forms of one-way travel into the future
via time dilation, it is currently unknown whether
the laws of physics would allow time travel into the
past.

3. •Einstein proposed the theory of SPECIAL RELATIVITY
and GENERAL RELATIVITY
•It states that space and time are really aspects of
same thing :SPACE-TIME
•According to this time moves differently to different
people corresponding to there relative speed

4. •Going forward in time is (relatively) easy
•Going back is much harder
•But Einstein’s theory of general relativity seems to
allow it
•Forward time travel: my time goes slower than yours
(like aging slower than everyone else)
•Backward time travel: my time goes faster than yours
(like aging faster than everyone else).
•If you don’t want to become young or old, you can use
the Time Tunnel method which will come in later
slides.

6. •A wormhole is a theoretical passage through space-
time that could create shortcuts for long journeys
across the universe.
•Wormholes are predicted by the theory of general
relativity. But be wary: wormholes bring with them
the dangers of sudden collapse, high radiation and
dangerous contact with exotic matter.
•Einstein's theory of general relativity mathematically
predicts the existence of wormholes, but none have
been discovered to date.
•Entering a wormhole is 50 to 60 times more dangerous
than a black hole.

7. •In a wormhole, you will be teleported through the
‘Time Tunnel’ when your craft goes in it will exit the
Tunnel and comes out from the wormhole at very
distant place or another universe(if exists)whithin a
short span of time.
•There are some scientists who say that"A wormhole is
not really a means of going back in time, it's a
short cut, so that something that was far away is
much closer,"

8. •Time travel is possible, but it does not and cannot
change the past
•The idea of travellig to the violates the basic theory
of universe “CAUSE AND EFFECT”
•Cause and effect theory states that effect cant
happen before the cause happens

9. •If you could go back in time, you could kill your
grandparents before your dad was born then there
would have been no you to make a time machine
and go and kill him! Which means that you can’t
have killed him.
•This is the most famous paradox of time travel.

11. • Parallel universes can exist individually, or grouped
together as the “multiverse,” and offer the possibility of
a totally different reality in which someone, or
something, can exist, or hop back and forth between.
• The laws of nature may be different in one parallel
universe as they are in another, and in respect to time
travel, would provide multiple versions of the future in
which someone could exist, or not exist at all.
• Light speed limitations may not exist in a parallel
universe, and the paradoxes that keep us from
traveling back in time would be null and void if we
could jump into a different historical timeline.

12. Many World Interpretation
•It states that each time a different choice is
made at the quantum scale, a universe arises
to accommodate that choice, thus creating
infinite new worlds popping up all the time.
•Alternate timelines, each with their own
forward arrow of time and their own history,
may exist then, allowing time travelers to jump
into another version of history and override
those pesky paradoxes.

13. THANK YOU