What is the Zero-Point Energy?
We talked about the zero-point energy in the modern physics series. We know that particles come into and out of existence constantly, in every nook and cranny of spacetime. This explains the Casimir effect. But what is going on in reality? Is the universe truly probabilistic on this fundam
From playlist Just For Fun
http://www.teachastronomy.com/ What is the physical meaning of the cosmological constant? Astronomers do not know and physicists are puzzled too, but they've both come up with the idea of dark energy. In physics the vacuum is not totally empty. Particles and anti-particles can be create
From playlist 22. The Big Bang, Inflation, and General Cosmology
PHYS 101 | Gravitational Fields 4 - Where is Zero?
Just like gravitational potential energy near the earth, universal gravitational potential doesn't have to be zero anywhere. However, here we talk about one place that makes sense....
From playlist PHYS 101 | Universal Gravitation
Teach Astronomy - Dynamics of Expansion
http://www.teachastronomy.com/ General relativity makes a strong connection between the dynamics of the universal expansion, which is to say the rate of increase of the size with time, the density of matter, and the curvature of space itself. In an empty universe space is not curved. The
From playlist 22. The Big Bang, Inflation, and General Cosmology
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From playlist Science Unplugged: General Relativity
The multiverse hypothesis: Is our universe the only one?
Support me on Patreon: https://www.patreon.com/Sabine In the past decades, the idea that our universe is only one of many, has become popular among physicists. If there are several universes, their collection is called the “multiverse”, and physicists have a few theories for this that I e
From playlist Physics
Special Relativity E2 Relationship between Mass and Energy
The mass energy equivalence.
From playlist Physics - Special Relativity
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From playlist Science Unplugged: Big Ideas
Momentum and Angular Momentum of the Universe
Visualization of the conservation of the momentum and angular momentum of everything in the universe.
From playlist Physics
Dark Energy and the Vacuum Catastrophe
In this video I would like to discuss one of the great unsolved problems in fundamental physics, the famous vacuum energy catastrophe (also known as the cosmological constant problem). What makes the problem so fascinating is that it weaves together two of the most successful theories of t
From playlist Cosmology
AP Physics C: Universal Gravitation Review (Mechanics) - Also for JEE/NEET
Calculus based review of Universal Gravitation including Newton’s Universal Law of Gravitation, solving for the acceleration due to gravity in a constant gravitational field, universal gravitational potential energy, graphing universal gravitational potential energy between an object and t
From playlist JEE Physics Unit 6 - Gravitation and NEET Unit VI - Gravitation
Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/BWxT/ (September 21, 2013) Leonard Susskind solves the expansion equation for universes with zero total energy, and then adds a non-zero total energy term, which leads to an exploration of matter versus radia
From playlist Lecture Collection | Cosmology
Universal Gravitational Potential Energy Introduction
Universal Gravitational Potential Energy is introduced and graphed. It is compared to the force of gravity. And the “zero line” is defined. Want Lecture Notes? http://www.flippingphysics.com/universal-gravitational-potential-energy.html This is an AP Physics 1 topic. 0:00 Intro 0:11 “Norm
From playlist Gravity - A Level Physics
(February 11, 2013) After reviewing the cosmological equations of state, Leonard Susskind introduces the concept of vacuum energy. Vacuum energy is represented by the cosmological constant, and is also known as dark energy.
From playlist Lecture Collection | Cosmology
Lecture 7 of Leonard Susskind's course on Cosmology. Recorded March 9, 2009 at Stanford University. This Stanford Continuing Studies course is the fifth of a six-quarter sequence of classes exploring the essential theoretical foundations of modern physics. The topics covered in this cou
From playlist Lecture Collection | Modern Physics: Cosmology
Lecture 9 | Quantum Entanglements, Part 3 (Stanford)
Lecture 9 of Leonard Susskind's course concentrating on Quantum Entanglements (Part 3, Spring 2007). Recorded June 25, 2007 at Stanford University. This Stanford Continuing Studies course is the third of a three-quarter sequence of classes exploring the "quantum entanglements" in modern
From playlist Lecture Collection | Quantum Entanglements: Part 3 (Spring 2007)
19. The Cosmological Constant, Part II
MIT 8.286 The Early Universe, Fall 2013 View the complete course: http://ocw.mit.edu/8-286F13 Instructor: Alan Guth In this lecture, the professor reviewed gravitational effect of pressure and talked about age of universe and the cosmological constant, etc. License: Creative Commons BY-N
From playlist The Early Universe by Prof. Alan Guth
Lecture 4 of Leonard Susskind's Modern Physics concentrating on Cosmology. Recorded February 2, 2009 at Stanford University. This Stanford Continuing Studies course is the fifth of a six-quarter sequence of classes exploring the essential theoretical foundations of modern physics. The t
From playlist Lecture Collection | Modern Physics: Cosmology
Special Relativity E3 Relationship between Mass and Energy
The mass energy equivalence.
From playlist Physics - Special Relativity
Lecture 8 of Leonard Susskind's course on Cosmology. Recorded March 16, 2009 at Stanford University. This Stanford Continuing Studies course is the fifth of a six-quarter sequence of classes exploring the essential theoretical foundations of modern physics. The topics covered in this co
From playlist Lecture Collection | Modern Physics: Cosmology