How Quantum Complexity Found Its Way into Black Hole Physics | Special Lecture

Leonard Susskind (Stanford University)
Quantum Complexity: Quantum PCP, Area Laws, and Quantum Gravity

Computational complexity is a very deep mathematical and logical concept that can give objective meaning to questions as varied as: How difficult is a theorem (some theorems are clearly more difficult than others); to how long a time does it take to produce a given quantum state of a quantum computer. But it has never till now been thought of as a physical property of a system. It was a great surprise that it found its way into black hole physics as a geometric property of black holes---the geometric size of their interiors. The introduction of complexity has greatly clarified the meaning of the black hole horizon. For example we now know that in many cases it is wrong to say that things cannot escape from behind the horizon; it is merely very complex. The horizon is also a censor that forbids an observer outside the black hole from witnessing violations of a profound physical principle: the so-called "quantum extended Church Turing Thesis." I'll try my best to explain these things.

[dosesandmimoses]

Too much audience is a great thing! I’ve enjoyed listening to your lectures over the years! Gratitude Professor!

[diegoalejandrosanchezherre]

Its very gratefull to see Lenny giving lectures Yet, he is a great and very creative mind, its feels like he always has something very important to Say about very deep notions of the fundamental behavior of the universe, a Titan of human thinkig!!!🙌👏

[Alilinpow]

Thank you for this lecture!
Prof. Leonard is amazing

[KaliFissure]

Time is a compactified dimension.
This forces chirality, limits, conservation. All of them are caused by compactified time.
One single Planck second is all the time needed to evolve the next condition.
It is the physical equivalent of the "moment of calculation" in the wolfram physics model or all computational models (in fact).

Time is compactified.
As per limit theorem,
There is a minima, Quantum flux, and a maxima. Event horizon.
There is also conservation as we are closed in the present.
According to limit theorem, the closure is between minima and maxima.
Every event horizon is

Neutron decay cosmology

Gravity gathers mass to event horizons.
All matter is made neutrons at event horizons because of electron capture.
Infalling neutrons (going at c?) do their kinetic energy off as mass for event horizon.
Neutron itself takes an EinsteinRosen bridge from highest energy pressure conditions, to lowest energy density point of space where the quantum basement is lowest and easiest to penetrate.
Neutron out in a deep void somewhere
Soon decays into amorphous monatomic hydrogen, proton electron soup, Dark matter.
The decay from neutron 0.6fm³ to 1m³ of amorphous hydrogen gas is a volume increase of around 10⁴⁵.
Expansion. Dark energy.

In time this amorphous hydrogen stabilizes and coalesces first into monatomic hydrogen And then into H2 and all the other elements
The entire time falling down the gravity hill towards an event horizon.

Loop

This is where the closure is.
Geometry and evidence say so.

Neutron decay cosmology 🖖

[isonlynameleft]

How quantum complexity got its groove back!

[marvinmaali]

I wrote a story based on the statement made at 48:00

[fkeyvan]

How Quantum Complexity Found Its Way into Black Hole Physics? Because Lenny Susskind forced it to

[군주-bv]

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