This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Spacetime


00:02:38 1 Introduction
00:02:47 1.1 Definitions
00:07:39 1.2 History
00:15:58 2 Spacetime in special relativity
00:16:09 2.1 Spacetime interval
00:25:48 2.2 Reference frames
00:26:46 2.3 Light cone
00:27:14 2.4 Relativity of simultaneity
00:27:30 2.5 Invariant hyperbola
00:28:26 2.6 Time dilation and length contraction
00:28:44 2.7 Mutual time dilation and the twin paradox
00:29:03 2.7.1 Mutual time dilation
00:29:09 2.7.2 Twin paradox
00:29:42 2.8 Gravitation
00:31:57 3 Basic mathematics of spacetime
00:32:38 3.1 Galilean transformations
00:33:45 3.2 Relativistic composition of velocities
00:35:03 3.3 Time dilation and length contraction revisited
00:37:53 3.4 Lorentz transformations
00:39:52 3.4.1 Deriving the Lorentz transformations
00:40:33 3.4.2 Linearity of the Lorentz transformations
00:40:44 3.5 Doppler effect
00:43:36 3.5.1 Longitudinal Doppler effect
00:48:26 3.5.2 Transverse Doppler effect
00:49:14 3.6 Energy and momentum
00:49:24 3.6.1 Extending momentum to four dimensions
00:50:21 3.6.2 Momentum of light
00:51:50 3.6.3 Mass-energy relationship
00:52:01 3.6.4 Four-momentum
00:52:13 3.7 Conservation laws
00:52:55 3.7.1 Total momentum
00:53:33 3.7.2 Choice of reference frames
00:53:49 3.7.3 Energy and momentum conservation
00:54:29 4 Beyond the basics
00:54:46 4.1 Rapidity
00:54:57 4.2 4‑vectors
00:56:12 4.2.1 Definition of 4-vectors
00:56:22 4.2.2 Properties of 4-vectors
00:57:45 4.2.3 Examples of 4-vectors
00:58:03 4.2.4 4-vectors and physical law
00:59:59 4.3 Acceleration
01:00:23 4.3.1 Dewan–Beran–Bell spaceship paradox
01:01:08 4.3.2 Accelerated observer with horizon
01:04:52 5 Introduction to curved spacetime
01:05:17 5.1 Basic propositions
01:05:56 5.2 Curvature of time
01:07:34 5.3 Curvature of space
01:07:50 5.4 Sources of spacetime curvature
01:08:10 5.4.1 Energy-momentum
01:08:26 5.4.2 Pressure and stress
01:09:36 5.4.3 Experimental verification
01:10:40 5.4.3.1 • Active, passive, and inertial mass
01:11:16 5.4.3.2 • Pressure as a gravitational source
01:11:22 5.4.3.3 • Gravitomagnetism
01:11:32 6 Technical topics
01:11:59 6.1 Is spacetime really curved?
01:14:00 6.2 Riemannian geometry
01:14:43 6.3 Curved manifolds
01:17:28 6.4 Privileged character of 3+1 spacetime
01:17:37 7 See also
01:18:48 8 Notes
01:19:20 9 Additional details
01:20:00 10 References
01:20:43 11 Further reading
01:20:58 12 External links
01:21:32 γmv approaches mv, the classical term for momentum. Following this perspective, γm can be interpreted as a relativistic generalization of m. Einstein proposed that the relativistic mass of an object increases with velocity according to the formula mrel
01:22:07 mrelc
01:25:00 ±pc.
01:25:04 Four-momentum
01:26:33 Conservation laws
01:27:21 Total momentum
01:28:19 m2v2 collide to produce a single particle of conserved mass m
01:28:38 (m1v1 + m2v2)/(m1 + m2). The total momentum p
01:29:53 Choice of reference frames
01:30:48 Energy and momentum conservation
01:31:08 v − u, the momentum p'
01:31:33 0 both before and after collision. In the Newtonian analysis, conservation of mass dictates that m
01:32:25 mv, fail to behave properly under Lorentzian transformation. The linear transformation of velocities v'
01:35:00 4.12 MeV. Most of the energy is carried off by the near-zero-mass neutrino.
01:35:08 Beyond the basics
01:35:18 The topics in this section are of significantly greater technical difficulty than those in the preceding sections and are not essential for understanding Introduction to curved spacetime.
01:35:31 Rapidity
01:39:17 {\displaystyle \beta
01:43:06 4‑vectors
01:44:23 Definition of 4-vectors
01:46:17 Properties of 4-vectors
01:49:58 Examples of 4-vectors
01:56:18 4-vectors and physical law
01:57:15 Acceleration
01:58:12 Dewan–Beran–Bell spaceship paradox
02:03:07 Accelerated observer with horizon
02:05:43 {\displaystyle \gamma
02:08:30 Introduction to curved spacetime
02:08:40 Basic propositions
02:12:02 GMmg /r2
02:13:07 Curvature of time
02:14:17 (2gh)1/2, so that its total energy E, as measured by an observer on the ground, is m + ½mv2/c2
02:14:53 m', since otherwise one would be able to construct a perpetual motion device. We therefore predict that E'
02:18:36 Curvature of space
02:25:03 Sources of spacetime curvature
02:26:47 j terms (green) represent isotropic pressure, and the i ≠ j terms (blue) represent shear stresses.One important conclusion to be derived from the equations is that, colloquially speaking, gravity itself creates gravity. Energy has mass. Even in Newtonian gravity, the gravitational field is associated with an energy, E
02:27:47 Energy-momentum
02:29:32 Pressure and stress
02:30:43 Experimental verification
02:31:36 • Active, passive, and inertial mass
02:34:00 • Pressure as a gravitational source
02:35:52 9, while bromine has Z
02:36:59 • Gravitomagnetism
02:38:30 Technical topics
02:38:40 Is spacetime ...