fyi time travel is possible so they just mentioned these curve black holes as well which is super
interesting you could possibly cross the middle of this ringed singularity mini black holes at lhc
g'day my smart mates my name's dylan dance i'm a physicist from the land down under
grab a coffee actually where is my coffee grab a coffee
grab an apollo 11 space capsule grab whatever you want let's talk some natural philosophy
so this video will probably end up being really long so i'll probably break it into two parts
so make sure you subscribe if you want to catch the next part
straight into it the universe has a beginning but no end
that's the current way of thinking that's you know the consensus in the physics community
um but it isn't the only way to look at what we currently see out there in the universe it is
the one that has the most evidence that there was a beginning and there is seemingly no end hosini
in a way it's not really correct to say stars have an end because the stuff that makes stars
doesn't have an end that those things that stars are composed of yes the star will die but that
material will be shot out into the universe and it'll exist seemingly till the end of time so
that's kind of not correct in a way and if you didn't know you're actually made
of star stuff now most people have heard old carl sagan say this but yeah the stuff
making you up all the heavy elements in your body come from exploding stars star stuff and
the stuff in your left hand probably comes from a different star to the stuff in your right hand
anyway let's see if we can make it past 30 seconds
machines are we so if this show is about time machines uh that means everything that happens
at the start is probably very important i mean the episode is called prologue of the beginning
and end hint hint um so let's keep watching i tell a time travel joke but you didn't like it
if you watched my last video i've already used that one
it's about time machines wouldn't it be the invention
it's probably a time machine giving what the show's about
that's probably him so before i try and explain what time is um and whether or
not time travel is possible i reckon we watch a bit more of the show and see what it has to say
then i can give you guys what i know so fyi time travel is possible you're doing it right now
as you're traveling into the future you're time traveling and as you look out into the universe
you're looking out into the distant past because space and time are the same thing wrapped up
into this one thing space time so as you look through space you're looking through time and
blah blah blah so let's keep watching and we can talk about more about time in a minute
yeah look it's a great storyline fantastic idea but i don't think so
trying to build time machines or mess with things like time and that way so
i think you guys can all relax with that one i mean if you had a look at the large hadron
collider lhc you'd probably think it's some sort like something like a time machine as well
so they just mentioned these ker black holes as well which is super interesting because
these hypothetical black holes in which you possibly could survive crossing the event horizon
so normally with black holes if you were to fall into one uh you'd be torn you'd be spaghettified
into a stream of quarks you'd be crushed by the tidal forces the increase in gravity
as you approach the singularity inside which supposedly has infinite gravity right so with a
curl black hole it's just a spinning black hole so it's it's not too surprising that you know these
spinning black holes might be a real thing because as things fall into like drains they
generally spin around so it's not too surprising to think of a spinning black hole because
most of the material falling into black holes are already spinning but these curve black holes go
above and beyond uh have you ever spun water in a glass before so much so that you know a little
bit in the middle parts and there's no water well this could be happening in black holes where
the space time around the black hole is getting dragged this is called frame dragging and at the
center of the black hole instead of just having you know a single singularity a point you actually
have a ring and if the black hole is massive enough it needs to be huge so the tidal force
is uh gradual as you get closer to the singularity so it doesn't this spaghettification process
doesn't happen and you could possibly cross the middle of this uh ringed singularity
and who knows what will happen maybe it's a wormhole you know you come out the other side
in another place in space or time or another universe altogether well no one actually knows
um and it could be much more boring than that in the center of a black hole could just be a little
bit of mass and it's extremely dense and you know if you fall into one you're going to get crushed
now if this is where the show is going and they're going to suggest that you know that
these time machine devices use curl black holes um well it doesn't really work because you'd need
huge black holes like super massive size you know the middle of galaxy size where they're
millions of times the mass of our sun um so i don't know how they're going to deal with that
foreign
so let's pause here because it's a bunch we can talk about so i noticed the report was 137
the fine structure constant which is essentially strength of electromagnetism has this funny value
one over one three seven it's very mysterious and that's obviously a load to that but anyway these
mini black holes at lhc well if you remember back if you're old enough
there was a bunch of uh worry that you know the lhe might accidentally start producing black holes
and a lot of people correctly pointed out that you would need way more energy than lhc is capable of
producing to actually create black holes however there are some theories in theoretical physics
which could actually make it possible for the lhc to produce micro or mini black holes
it's very much related to other dimensions and something called the hierarchy problem
which is has to do with the strength of gravity and why it is so much weaker than all of the other
forces of nature because it is very weak in this hypothesis it explains the weakness of gravity
by suggesting that the universe is actually just a part of a larger higher dimensional bulk
that the universe isn't all there is there's some there's much more out there more dimensions and
that the gravity is actually really strong however gravity is the only force that actually can roam
freely through all through the larger dimensional bulk and because of that it actually gets diluted
so in our little pocket of you know the broader thing um gravity is actually diluted and it's
actually much weaker compared to the other forces and in this hypothesis because gravity is actually
so strong it might be possible to merge gravity with the other forces at much lower energies
so something i should also say is that at the lhc at high energies some of the fundamental forces
merge into each other and that's the case for all the other fundamental forces except for gravity we
don't know how gravity interconnects to them or we we think that it might uh merge into one unified
all all four of the forces into one unified force at extremely high energy but our current theory
suggests that you need a particle accelerator the size of the galaxy or even larger to unify
these forces using a particle collision so but with this hypothesis it might be possible with
something the size of the lhc it normally would require an insane amount of pressure and density
to squeeze enough material together to make it collapse down to an infinite point of density
um and if that's the case you know the lhc is not even close to operating at high enough energies to
produce black holes however with this other theory and hypothesis in theoretical physics it very well
very well might be but if the force of gravity is actually a lot stronger than we think then
it gravity could easily overwhelm the other forces and we could easily create black holes at the lhc
and it could be happening but we currently see no signs of it if the lhc really is creating
microscopic black holes you don't need to worry because these things would disintegrate rapidly
within like 10 to the negative 27 seconds which is less than a trillion trillionth of a second and
these things should decay into standard model or supersymmetric particles and we should be seeing
a bunch of tracks we currently don't see them so this is why this whole sort of theory is kind of
out the door but um yeah so if we saw microscopic black holes at the lac that would suggest
extra dimensions um and it would be super cool
also important to note here you wouldn't be able to use microscopic black holes for any sort of