Alan Guth Explains Inflation Theory

The physics world was rocked by a discovery that may shed light on the wild birth of our universe. Using the BICEP2 telescope at the South Pole, scientists have found what they believe to be the signature of gravitational waves propagating from the rapid expansion of the universe in the first tiniest fractions of seconds after the Big Bang.

Original Program date: June 1, 2013

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[daithiocinnsealach]

He reminds me of Hawking for some reason.

[valtih]

The most astonishing fact about our Universe is that it is uniform and the only way to explain is through the inflation. It is natural to think that Universe was uniform in the very beginning but, any unifority fades out in time unless we have the inflation.

[bguen]

"Repulsive gravity" like "dark matter" and "dark energy" is a necessary invention to make, as yet, unprovable theories work. Nobody has a clue as to the mechanism by which gravity works much less if it can work in reverse.

[Jr_Scientist]

According to some theories, colliding universes could lead to cosmic inflation, causing a rapid expansion of the universe.

[medaphysicsrepository]

This clip is kind of bad to be honest, at 2:19 guth says that the universe was uniform BEFORE the inflationary expansion then at 2:30 the guy says that the uniformity was because of events once inflationary expansion ENDED.

[Inertia]

can this explain the strange flying object i saw in 1994? And the many claims of these similar objects that seems break the physical laws of momentum and flight?

[janchytil]

Alan Guth grew from a particle physicist to cosmologist. His ‘due diligence’ shines through out all of his work. Great data, convincing logic, fabulous presentation. Well done, Alan !!!

[charlesbrightman]

Questions:
Assuming a singular mass existed that "banged", (even without the current forces of nature being in existence yet), why would the mass only "bang" in one direction? Wouldn't it make more logical sense that it would "bang" in a 360 degree spherical shape? Then the entire universe would all come into existence at basically the same time at a certain expansion point? Do we exist in a spherical universe that is resting upon a spherical fifth dimension (the dimension that had it's own forces of nature and the mass that "banged")? Is that why galaxies far from ours appear to be moving faster and faster and away from each other, they are going over the horizon of an expanding spherical universe? Is that why the universe is basically flat as it is all on a spherical surface of the fifth dimension? Is that how entanglement works in part? Energy goes through the fifth dimension and not necessarily through our universe? If the fifth dimension is really true, can we travel through it one day to other places in the universe?
Inquiring minds want to know.

[joekelly]

turning theory to fact, into speculation 😀

[thomaslux]

Why do I feel like science and scientists are always desperately looking for a theory that excludes the universe having a beginning and the universe being finely tuned? I'm a agnostic btw, boarding Theist.

[cartoonvandal]

so quantum fluctuations are responsible for the ripples we see in the CMB? But which field is responsible? I guess it would have to be the Higgs, or perhaps even some field we have yet to discover?

[dickarmstrong]

Thank you Alan, I love your lectures from MIT available on YouTube also. Such a great teacher.

[boydpease]

INFLATION
COULD
BE
A FUNCTION
OF THE SEPERATION
OF GRAVITY
REPULSIVELY
FROM
THE
JUST
EXISTING
SINGLE UNIFIED FORCE OR ALL FOUR COMBINED

INFLATION
DECELERATION
WOULD
THEN
OCCUR
AS
GRAVITY
ASSUMES
ITS
FUNCTION
AS
A
SINGLE
FORCE
(in connection with space and time)
Decelerate to the post inflationary rate of expansion the universe assumes to reach our present rate of expansion

[leandrocruz]

Yes, we need an explanation for why the Universe is homogeneous and other problemas, but, repulsive gravity? Really? For a very brief period of time than not anymore? How if it different for the "god of the gaps" argument that "real scientists" use? We see the problem, we must come up with an explanation, but, repulsive gravity for a fraction of a second is a stretch to large for me.

[kingtriplebbb]

Perhaps since the Universes came from Somewhere🤷 maybe the Universes are still in evolution of time Space. Therefore it's still going somewhere but where ? ? ? Hopefully this lovely earth 🌎 of ours won't hit an Iceberg🌊 So who's guiding the ship ? 🛳 ? ? ?

[mjt]

Is he saying repulsive gravity or propulsive gravity? I thought I heard both.

[Jahanlu]

Maybe the universe is not accelerating the expansion. What if we are getting closer to a black hole which relatively makes us feel the universe is expanding faster?

[KaliFissure]

A nice theory but… neutron decay cosmology. The process is continuous. We are looking back in time at not an event but along the timeline of a process. 

The quark soup is neutron, inflation is decay of neutron, a volume increase, energy density decrease, of 10^54 times. Then dark period after decay but before stabilization of electron orbitals so no emission or absorption of photons. Then stabilization and Then nebula to proto star to star until now with black holes.


The neutrons which contact event horizon become the vacuum energy for a single Planck second then re-emerge in lowest energy density points of space, deep voids, where they decay into amorphous atomic hydrogen. They retain local Hamiltonian and so no paradox. The decay process includes a volume increase, energy density decrease, of 10^54 times. Fine tuning. Expansion. Lambda. Dark energy. The decay product as described above is dark matter. Amorphous atomic hydrogen in lowest energy state. In time evolution

The universe is steady state. Time is a compact dimension but the universe is eternal.
Hubble Doppler is artifact of curvature of spacetime away from us as we exist in local singularity called observable universe. BranDicke. Cmb is that story I told at top.

Neutron decay cosmology is inevitable. Geometry requires.

[Physicslover]

Iam A student studying about inflationary model !
I came here to learn more about this!
Iam working on the mechanism of dark energy which is related to inflationary model!

[temp]

dam so the big bang, and the repulsive gravity formed the galaxy?