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2022-01-27: How Does Gravity Escape A Black Hole?

  • 04:32: The “speed of space” is just the speed of a free-falling, or inertial observer.

2018-04-11: The Physics of Life (ft. It's Okay to be Smart & PBS Eons!)

  • 11:07: ... Diagrams points out that from the point of view of an inertial observer, an accelerating particle detector emits particles instead of absorbing ...
  • 11:23: ... in short, the inertial observer sees the accelerating particle detector click as though it registered a ...
  • 11:49: ... inertial observer sees that there's a type of friction between the accelerating observer ...

2018-04-04: The Unruh Effect

  • 06:47: In the case of Hawking radiation, an inertial observer far from the black hole sees the radiation.
  • 07:06: ... if an accelerating Rindler observer is in the same location as an inertial observer, the former will see that patch of space filled with radiation, but the ...
  • 07:29: Does the inertial observer see some sort of spontaneous combustion?
  • 07:45: And the inertial observer would agree that it clicked, but they wouldn't see the particle that triggered it.
  • 09:13: An inertial observer sees the charged particle itself radiating, its energy extracted from the magnetic field.
  • 09:27: The Rindler and inertial observers disagree on the source of the energy even if they agree on the final result.

2018-01-17: Horizon Radiation

  • 00:46: And for two observers with very different, but constant speeds-- inertial observers, the vacuum itself should appear the same.
  • 03:33: There's no conflict for constant speed inertial observers.

2015-07-29: General Relativity & Curved Spacetime Explained!

  • 01:54: ... flat spacetime diagrams of inertia observers, the world lines of other inertial observers are straight, indicating constant spatial ...
  • 02:03: This captures Newton's idea that inertial observers shouldn't accelerate relative to other inertial observers.
  • 03:43: However, global inertial observers do.

2015-07-22: SPECIAL ANNOUNCEMENT + Flat Spacetime Geometry Comments

  • 02:48: Inertial observers will see each other dynamically, moving with a constant three-dimensional velocity.
  • 02:54: But does that mean that inertial observers are really moving with a constant three-dimensional velocity?
  • 03:22: Those are the guys that, it turns out, corresponds to inertial observers in Newtonian physics.
  • 04:32: ... diagrams that I drew in the last episode were from the point of view of inertial observers-- Blue Gabe, Red Gabe, the ...
  • 05:01: Imagine a family of inertial observers, all of whom are moving with different speeds relative to each other.
  • 05:06: That accelerating car, at any given moment, from its point of view, is always stationary instantaneously relative to one of those inertial observers.

2015-07-15: Can You Trust Your Eyes in Spacetime?

  • 06:49: Inertial observers have geodesic world lines and noninertial ones don't.
  • 08:37: ... of a 4-velocity vector a spacetime speed, then the world line of every inertial observer is a constant-speed straight ...
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