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scheduled video victory of the light
physicists just came up with a viable
model for a time machine core spirit
physicists have come up with what they
claim is a mathematical model of a
theoretical time machine a box that can
move backwards and forwards through time
and space the trick they say is to use
the curvature of space-time in the
universe to bend time into a circle for
hypothetical passengers sitting in the
box and that circle allows them to skip
into the future in the past people think
of time travel as something as fiction
and we tend to think it's not possible
because we don't actually do it says
theoretical physicist and mathematician
bent a bit from the University of
British Columbia in Canada but
mathematically it is possible together
with David sang an astrophysicist at the
University of Maryland tip it has used
Einstein's theory of general relativity
to come up with a mathematical model of
what they're calling a traversable a
causal retrograde domain in space-time
yep the acronym is literally TARDIS but
before we get into the madness of legit
time travel let's put this into
perspective real quick
the researchers aren't claiming to have
a blueprint for a doctor whose style
time machine that can be built tomorrow
they say the materials we need to build
this thing are so exotic
we haven't even discovered them yet but
we will get to that in a minute fiercely
let's talk about what to put in saying
are actually proposing the model is
based on the idea that instead of
looking at the universe in three spatial
dimensions with the fourth dimension
time separated we should be imagining
those four dimensions simultaneously
that allows us to consider the
possibility of a space-time continuum
where different directions in space and
time are all connected within the curved
fabric of the universe Einstein's theory
of relativity links gravitational
effects in the universe to a curvature
of space-time the phenomenon thought to
be behind the elliptical orbits of
planets
and stars if space-time were flat or unn
curved planets would move in straight
lines but according to relativity the
geometry of space-time becomes curved in
the vicinity of high mass objects which
causes planets to bend their paths and
rotate around their star instead what if
it int sang argues that it's not just
physical space that can be bent and
twisted in the universe time itself can
also be curved in the vicinity of high
mass objects the time direction of the
space-time surface also shows curvature
there is evidence showing the closer to
a black hole we get time moves slower
says tippet my model of a time machine
uses the curved space-time to bend time
into a circle for the passengers not in
a straight line that circle takes us
back in time in order to harness this
theoretical property the physicists
propose creating a kind of bubble of
space-time geometry which carries
whatever's inside it through space and
time along a large circular path if this
bubble can hit speeds greater than the
speed of light
something the pair say is mathematically
possible this would allow it to move
backwards in time it is a box which
travels forwards and then backwards in
time along a circular path through
space-time the researchers explained in
their paper delighted external observers
would be able to watch The Time
Traveller's within the box evolving
backwards in time on breaking eggs and
separating cream from their coffee you
can see the basic idea in the image
below with a passenger inside the bubble
Time Machine personai and an external
observer standing beside it person B the
arrow of time which under normal
circumstances in our universe at least
always points forward making the past
become the present within the bubble but
we'll see the B's events periodically
evolve and then reverse outside the
bubble observer B will see two versions
of a emerge from the same location
once clock hands will turn clockwise the
other counterclockwise in other words
the external observer would see two
versions of the objects inside the time
machine
on version revolving forwards in time
the other backwards while tippet and
saying say the Maxis sound the problem
now is we don't actually have the right
materials to build what they're
proposing while is it mathematically
feasible it is not yet possible to build
a space time machine because we need
materials which we call exotic matter to
bend space-time in these impossible ways
but they have yet to be discovered
says tippet their idea recalled another
theoretical time machine the Alcubierre
drive which would also use a shell of
exotic matter to transport passengers
through time and space hypothetically
both ideas can't go very far without
some idea of how to actually produce
these space-time bending materials but
as tippet points out we're never going
to stop wondering about the
possibilities of time travel and this is
just one more direction we can take this
mind-bending physics studying space-time
is both fascinating and problematic
he says experts in my field have been
exploring the possibility of
mathematical time machine since 1949 and
my research presents a new method for
doing it the research has been published
in classical and quantum gravity
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