Are These The Strangest Objects In The Universe?
全トランスクリプト
The first sign would be small. [music]
Through a telescope, a single star would
appear to split in two. Perhaps it would
be dismissed as a mistake, an oddity
caused by a problem with the lens. But
then a few nights later, telescopes
across the globe would [music] spy the
same thing. Detectors around the world
would notice increased levels of cosmic,
UV, and gamma rays. Something energetic
would be detected happening in the
nearby universe.
Then would come the rumbling. To begin
with, it would be subtle, noticed only
by gravitational wave detectors. Strange
ripples in space fitting no known
template. An invisible approaching
threat.
But in time, we would see it stretching
from one horizon to the other. As if it
cut the universe in two, [music] it
would pulse with exotic energies. When
it whipsled onto itself, it would create
an explosion brighter than a supernova.
And indeed, by the time it became
visible to the naked eye, it would
already be too late.
The universe holds close [music] its
dark secrets. Beyond the boundaries of
the known and familiar, past the
protection of the sun, and the circling
embrace of the Milky Way, lie relics of
its ancient past, remnants [music]
of the Big Bang itself.
There are defects in the cosmos, and
they have been here a long, long time.
They were there in epochs of fire and
unification at the beginning of
everything. The long eras of splintering
and fracturing, the chaos and violence
before the universe as we know it took
its final shape. They appear in our
theories. We give them names. We assign
them properties. [music]
We ask how they might survive to the
present day. How we might detect them
through a subtle signature in this or
that survey. We tell ourselves we are
safe.
But perhaps we are wrong.
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[music]
We live in a broken universe and in 1983
physicists revealed a more perfect one.
The laboratory [music] was called
Underground Area 1. It sat outside the
main detection chambers of CERN, the
collection of massive particle colliders
situated at the border of France and
Switzerland. The main detector consisted
of a series of cylinders almost 6 m long
and over 2 m wide filled with ultra pure
neutral argon and ethane gases. A
complex zigzagging of 17,000 wires and
over 6,000 sensors tracked the
three-dimensional movement of any
charged particles as they raced through
the chamber. After years of development,
the team at UA1 had hacked together a
new kind of collider, one that combined
protons and anti-rotons together at
nearly the speed of light. With the
machine in operation, the particles
raced around kilometers of circular
track, accelerating to higher energies
with each pass, coming within
centimeters of each other. Finally, at
the last moment, right at the very
limits that [music] the accelerators
could achieve before their beams of
particles drifted off course, the
engineers initiated a carefully
orchestrated sequence of events that
brought the twin beams into collision
precisely within the UA1 chamber.
And for the barest fraction of a second,
when the energies peaked and the
collision ignited to its maximum
intensity, a pure infant universe was
born.
This new universe was unbroken,
symmetric. Strange particles sprung into
existence. [music] the wires and
detectors of the chamber briefly
registering their exotic presence before
they flashed away.
But [music] this was no portal into
another dimension.
It was a window into our past.
Few people anticipated what would happen
on that fateful day in 1983.
Some of them, like Peter [music] Higgs,
are well known today with their names
attached to Nobel prizes and
international recognition. But some
stayed out of the limelight, content to
do their work regardless [music] of the
promise of fame.
By all accounts, [music]
Sir Thomas Kibble was the gentleman's
gentleman and the scientist's scientist.
[music] He was kind, gregarious, and
dignified. He delighted in his work, in
the camaraderie of his peers, [music]
and his ventures into the frontiers of
physics. Indeed, in 2013, when Peter
Higgs was awarded the Nobel Prize, he
expressed regret that Kibble was not
joining him. And yet, when asked his own
opinion, Kibble simply shrugged. He was
happy with what he had accomplished, he
didn't need a gold medal to reap his
rewards.
But what was it that he had found? What
was it that was confirmed in the fires
of CERN in 1983?
The theory of the Big Bang tells us that
the universe was smaller, hotter, and
denser in the past. Billions of years
ago, the entire observable universe had
a temperature of over a quadrillion
degrees and was compressed into a volume
no bigger than a peach. And Peter Higgs,
Tom Kibble, and others discovered that
at those insane energies, what we call
the forces of nature take on an entirely
different form.
There are four fundamental forces that
control everything within the universe.
Gravity, electromagnetism, and the
strong and weak nuclear forces which
operate at atomic scales. At least there
are usually four. For at high enough
energies, [music] we know that two of
these disperate forces merge together
into a single unified hole. At extreme
enough energy scales, there are no
longer four forces of nature. There are
only three. gravity, the strong force,
and the electroeak force.
This is a symmetry of nature exposed
only at incredibly high energies. The
electromagnetic and weak forces become
two [music] sides of the same coin. The
same way we view electricity and
magnetism as two sides of
electromagnetism.
But this symmetry is broken in the
everyday cosmos with some mechanism
driving a wedge between them, making
them appear and act as completely
different forces.
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