Lecture 8 | Topics in String Theory

(March 7, 2011) Leonard Susskind gives a lecture on string theory and particle physics that dives into the idea of cosmic horizons as well as the relationship between ultraviolet and infrared light.
In the last of course of this series, Leonard Susskind continues his exploration of string theory that attempts to reconcile quantum mechanics and general relativity. In particular, the course focuses on string theory with regard to important issues in contemporary physics.
This course was originally presented in Stanford's Continuing Studies program. Leonard Susskind is the Felix Bloch Professor of Physics at Stanford University.
Stanford University:
www.stanford.edu/
Stanford Continuing Studies Program:
csp.stanford.edu/
Stanford University Channel on KZbin:
/ stanford

[@FirstRisingSouI]

"Assuming we don't pass through each other's horizons, we'll meet here next week." Oh Susskind, I love you.

[@joabrosenberg2961]

Is the world Lorenz invariant?; Universe expansion and Vaccum energy 14:30; Hubbel constant 24:30; de Sitter Universe 43:30; Event horizon 1:08:00; de Sitter Penrose diagram 1:25:00; Red shift 1:35:00

[@Dyslexic-Artist-Theory-on-Time]

Could quantum mechanics represent the passage or Arrow of Time? This theory is based on just two postulates, 1.The first is that the quantum wave particle function explained by Schrödinger’s wave equation represents the forward passage of time or Arrow of Time itself photon by photon, quanta by quanta or moment by moment. 2. The second is that Heisenberg’s Uncertainty Principle that is formed by the wave function is the same uncertainty we have with any future event. No strings!

[@nmarbletoe8210]

Lenny doesn't mention that type of vacuum energy detector, but i thought vacuum energy was measured in the lab as casimir force.

[@aqouby]

@nickharvey7 Time, relative to the object that is observing it, moves at the speed of light. I think it's the Uncertainty Principle that denies the ability to represent any kind of idea of time. Not quite sure what you mean though.

[@xi7837]

hey

[@mattryan2006]

when i saw that the scale factor x hubble's constant was the rate of change in a - that's when i had my a-Ha moment :)

[@while_coyote]

Students: Ask your long, dumb, interrupting questions during the breaks, please!

[@adeetyachoubey914]

no they wont, cuz unlike u they r not watching it for free, they earned all this and got into MIT

[@eupraxis1]

I was under the impression that the speed of light is invariant; and that the apparent slower speeds in other mediums (that is, not in a vacuum or in expanding space) are the result of a statistical slowing due to photons interacting with that medium (or 'slowed' by expanding space, etc.) and thus not really slowing but delayed. Is that not so? To anyone who knows.

[@KrzysztofDanielCiba]

Lemma: Prof Susskind addiction to cookies is growing faster than expansion of the Universe. It's 8th lecture and he eats one in the very 1st second.

[@grunder20]

what does STRING THEORY really mean?

[@Dyslexic-Artist-Theory-on-Time]

@aqouby Could the Uncertainty Principle be the same uncertainty we have with any future event? Formed by a process of continuous change that we see and feel as the flow of time itself

[@aqouby]

@nickharvey7 Yes and no. We cannot know future events, let's give an example... say... weather-- We can't know the weather beyond about 3 weeks because of its a structure of chaos. I believe you're mistaking chaos with the Uncertainty Principle. There's a moment when a predictable thing becomes unpredictable.. The horizon of uncertainty, as it were. The Uncertainty Principle has virtually nothing to do with the macroscopic passing of time that we see today. If you need further expl then just ask

[@SalvatoreIndelicato]

Lezione mirabile

[@LLorfa]

1:14:15 glitch in space time :-P

[@live4Cha]

13 - 7 = 4 lol

[@pedroakjr2371]

After that I feel like there's still hope for me LOL

[@relike868p]

Can vacuum energy be what we call God?