Einstein's miracle year - Larry Lagerstrom

As the year 1905 began, Albert Einstein faced life as a “failed” academic. Yet within the next twelve months, he would publish four extraordinary papers, each on a different topic, that were destined to radically transform our understanding of the universe. Larry Lagerstrom details these four groundbreaking papers.

Nima Arkani-Hamed Public Lecture: Quantum Mechanics and Spacetime in the 21st Century

Dr. Nima Arkani-Hamed (Perimeter Institute and Institute for Advanced Study) delivers the second lecture of the 2014/15 Perimeter Institute Public Lecture Series, in Waterloo, Ontario, Canada.

Held at Perimeter Institute and webcast live worldwide on Nov. 6, 2014, Arkani-Hamed's lecture explores the exciting concepts of quantum mechanics and spacetime, and how our evolving understanding of their importance in fundamental physics will shape the field in the 21st Century.

Perimeter Institute Public Lectures are held in the first week of each month.

More information on Perimeter Public Lectures: http://ow.ly/DCYPc

 

What Is The Speed of Dark?

Shadows moving faster than light?

 

Relativity Isn't Relative

Several important quantities are not relative.

 

Light Speed: From Minecraft to Reality

Using Minecraft to explain speed of light.

 

What is quantum gravity?

In less than 100 seconds, Leron Borsten explains that general relativity and quantum mechanics are very successful in their own domains, but the jury is still out on how to unify these two great theories of physics.

 

Modern Physics: Special Relativity (Stanford), Lecture 8

Lecture 8 of Leonard Susskind's Modern Physics course concentrating on Special Relativity. Recorded June 9, 2008 at Stanford University.

 

Is time travel possible? - Colin Stuart

Time travel is a staple of science fiction stories, but is it actually possible? It turns out nature does allow a way of bending time, an exciting possibility suggested by Albert Einstein when he discovered special relativity over one hundred years ago. Colin Stuart imagines where (or, when) this fascinating phenomenon, time dilation, may one day take us.

 Lesson by Colin Stuart, animation by TED-Ed.

 

Modern Physics: Special Relativity (Stanford), Lecture 7

Lecture 7 of Leonard Susskind's Modern Physics course concentrating on Special Relativity. Recorded May 25, 2008 at Stanford University.

 

3 Simple Ways to Time Travel (& 3 Complicated Ones)

Walk, build a wormhole...

 

Modern Physics: Special Relativity (Stanford), Lecture 6

Lecture 6 of Leonard Susskind's Modern Physics course concentrating on Special Relativity. Recorded May 19, 2008 at Stanford University.

 

Modern Physics: Special Relativity (Stanford), Lecture 5

Lecture 5 of Leonard Susskind's Modern Physics course concentrating on Special Relativity. Recorded May 12, 2008 at Stanford University.

 

Modern Physics: Special Relativity (Stanford), lecture 4

Lecture 4 of Leonard Susskind's Modern Physics course concentrating on Special Relativity. Recorded May 5, 2008 at Stanford University.

 

Modern Physics: Special Relativity (Stanford), Lecture 3

Lecture 3 of Leonard Susskind's Modern Physics course concentrating on Special Relativity. Recorded April 28, 2008 at Stanford University.

 

Relativity Train

The Relativity Train is a realization of the famous Einstein thought experiments involving traveling trains carrying clocks and meter sticks. The demonstration is used to show how the preservation of the postulated constancy of physical laws and the speed of light in all inertial frames requires length contraction and time dilation in the train frame relative to the lab frame of reference. The demonstration is, of course, not a real experiment but rather a visual means of showing (without using any equations) how length contraction and time dilation are necessary consequences of Einstein's two assumptions.

 

MAGNETS: How Do They Work?

How do magnets work? Why do they attract and repel at long distances? Is it magic? No... it's quantum mechanics, and a bit more, as we explain in this, the longest MinutePhysics video ever.

 

 Magnetism seems like a pretty magical phenomenon. Rocks that attract or repel each other at a distance - that's really cool - and electric current in a wire interacts in the same way. What's even more amazing is how it works. We normally think of special relativity as having little bearing on our lives because everything happens at such low speeds that relativistic effects are negligible. But when you consider the large number of charges in a wire and the strength of the electric interaction, you can see that electromagnets function thanks to the special relativistic effect of length contraction. In a frame of reference moving with the charges, there is an electric field that creates a force on the charges. But in the lab frame, there is no electric field so it must be a magnetic field creating the force. Hence we see that a magnetic field is what an electric field becomes when an electrically charged object starts moving.

 

E=mc² is wrong? - Sixty Symbols

It's the most famous science equation in history... but E=mc² is not technically correct.

Modern Physics: Special Relativity (Stanford), Lecture 2

Lecture 2 of  Leonard Susskind's Modern Physics course concentrating on Special Relativity. Recorded April 21, 2008 at Stanford University.

 

Public Lecture—The Dark Universe Through Einstein's Lens

Lecture Date: Tuesday, July 23rd. Debbie Bard, a staff scientist at SLAC and a member of the Kavli Institute for Particle Astrophysics and Cosmology, delivered the July 23 SLAC Public Lecture, "The Dark Universe Through Einstein's Lens."

 Bard's talk explains the phenomenon known as gravitational lensing and how astrophysicists use it to explore the 95 percent of the universe that remains unseen: dark matter and dark energy.

 

Relativity Paradox - Sixty Symbols

Trains, tunnels, muons and giant guillotines - strange things happen when you travel close to the speed of light. Discussing relativity, time dilation and Lorentz contraction.