time travel presentation

7/29/2019 Time Travel presentation

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TIME TRAVEL!

Aniruddha HalderKrishnendu Shil

Rabi Shaw

Arka Sarkar


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Overview

Introduction

Theories

Paradoxes

Research

References in Fiction

Conclusions

References


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Introduction


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What is Time Travel?

A concept in which time is traversed inmuch the same way that space istraversed.

Possibly between parallelrealities and universes

Once confined to fantasy

and science fiction, timetravel is now simply anengineering problem.


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Concept of Time

The indefinite continued progress of

existence and events in the past, present,

and future, regarded as a whole." [Oxford

Dictionary]

Measurement to quantify duration of

events?

Social phenomenon?


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Spacetime

Model combining 3D space and 1D time into a

single manifold.

Einsteins special relativity: Space and Time are

not possible to separate. New concept of distance,

spacetime interval:


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Theories


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Time Dilation

Permitted by Special Theory of Relativity. Time appears to pass more slowly for faster moving

bodies.

Gives rise to Twin Paradox

Preserves causality as only forward travel is possible

Where is Lorentz factor


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Wormholes

Hypothetical topological feature of

spacetime.

Essentially a shortcut through space and

time.

Analagous to a worm burrowing through

an apple rather than travelling around the

surface.


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Wormhole created.

One end accelerated to near speed of light andbrought back to point of origin.

Due to time dilation, opposite ends of wormholehave experienced different subjective passageof time.

Therefore travelling through the wormhole wouldbe travelling to different point in spacetime.

Would require orders of magnitude more energythan sun can produce in its lifetime (according tocurrent theories)

Wormholes for Time Travel


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Tipler Cylinder

Hypothetical object theorizedby Frank J. Tipler in 1974.

Sufficiently long cylinder with

mass of several neutron stars. Induced to spin at near speed

of light rotation rate.

Creates frame dragging effect,

warping spacetime in itslocality.

Travel limited to times in whichcylinder already exists.


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Light Cylinders

Single continuously circulating

unidirectional beam of light.

Produces weak and strong gravitational

field.

Exterior strong gravitational field is shown

to contain closed time-like lines.

Presence of such lines indicates possibility

of time travel into the past.


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Flux Capacitor

Conceived onNovember 5, 1955 byDr. Emit Brown.

Requires speeds inexcess of 88 MPH.

Energy requirementsof 1.21 JigoWatts.

Stainless steelmounting assists influx dispersion.


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Paradoxes


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Twin Paradox

Stems from theory of special

relativity. Uses concept of time

dilation.

One of two twins undertakes long

space journey at near speed of

light.

Due to time dilation, the amount of

time observed by the twin moving is

less (Lorentz factor) than the timeobserved by the stationary twin.

PARADOX!!!!!!1


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Grandfather Paradox

Often used to argue that backwards time travelis not possible

You travel back in time and kill your biologicalgrandfather before he met your grandmother.

One of our parents, and thus you, would neverhave been conceived.

It is therefore impossible for you to have traveledback in time to kill your grandfather.

Therefore your grandfather would have lived toconceive your parent, who would haveconceived you.

PARADOX!!!!!!1


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Predestination Paradox

Somewhat opposite to the grandfatherparadox.

A loop of events in time that predestine a

time traveler to travel in the first place. A closed causal loop.

Events are both cause and effect of one

another.

PARADOX!!!!!!1


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Causal Loop


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Ontological Paradox

Used to argue why history can not bechanged by time travel.

Backwards time travel is only fulfilling role

in history, not changing it. Whatever has happened was meant to

have happened.

Raises question of where, when, and bywhom items or information are created.

PARADOX!!!!!!1


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Causal Loop


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Conservation of Mass/Energy

Net amount of matter and energy in

universe is constant at any given time.

If a person travels back in time, the net

mass/energy at the origin is lowered while

the net mass/energy at the destination is

increased.

PARADOX!!!!!!1


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Research


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Ronald L. Mallett

Received Ph.D from Penn

State University at age 25.

Professor of physics at the

University of Connecticut. Specializes in quantum

gravity, general relativity,

and time travel.

Featured in 2003 BBC

documentary The Worlds

First Time Machine.


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Working on plans for a time machine using RingLaser (Light Cylinder).

Life dream is to travel back in time to save his

father who prematurely died of a heart attack atage 33.

Has thus far been unsuccessful...


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References in Fiction


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Time travel is a popular topic for fiction,especially in science fiction movies, television,

and novels. Many stories of time travel have had profoundeffects on pop culture.


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Terminator

Cyborg travels back intime from post-apocalyptic future whererobots rule over remnants

of human race to killleader of resistancemovement when he isyoung.

Features examples of

grandfather,predestination, andontological paradoxes


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Superman (1978 film)

Superman flies around the world at super-speedin the opposite direction of the Earths rotation.

Momentum from him flying causes Earth to spin

backwards on its axis.

Logically, this causes time to move backwards.


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Futurama

Crew travels 1000+ years back in time to

1950s.

Fry, under the instruction of Professor

Farnsworth to not do anything to change

history, like killing your own grandfather,

inadvertently kills his own grandfather.


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Due to Grandfather

Paradox, Fry should have

never been born and thus

not able to travel back intime to kill his

grandfather.

However, in an example

of the predestinationparadox, Fry finds himself

overjoyed to still be alive

and in celebration, end up

impregnating a localwaitress who turns out to

be his grandmother.


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Back to the Future Trilogy

Marty McFly and Doc

Brown travel throughout

the past, present, and

future in a tricked outDelorian.

Wacky hijinx ensue.


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Paradoxes seen in Back to the Future

Predestination: Chuck Berry inspired to

write Johnny B Goodeafter hearing Marty playthat very song

Mayor Goldie Wilsoninspired to becomemayor after Martyinforms him that he willbe mayor

Grandfather:

Marty prevents hisparents from meetingand as a result his momhas the hots for him


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Conclusion

Time travel is awesome

However, you must be

careful not to:

Kill your grandfather Become your grandfather

Cause your mom to have the

hots for you

Reverse the rotation of theEarth


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References

Wired http://www.wired.com/wired/archive/11.08/pwr_timetravel_pr.html

Special Relativity

http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/tdil.html Ronald Mallett

http://www.phys.uconn.edu/faculty/mallett.html

Wikipedia

http://en.wikipedia.org/wiki/Time_travel

http://en.wikipedia.org/wiki/Time_dilation

http://en.wikipedia.org/wiki/Wormhole


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Questions?

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