Relativity FAQ

- Common Relativity questions, quality answers
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 Meta Thread / Thread Starter Last Post Replies Views Views: 4,645 Announcement: Follow us on social media and spread the word about PF! Jan16-12 What is the Bell spaceship paradox, and how is it resolved? Bell describes two spaceships that start out at rest... Mar11-14 10:20 AM bcrowell 0 5,616 FAQ: How fast do changes in the gravitational field propagate? General relativity predicts that disturbances in the... Sep10-12 10:09 AM bcrowell 0 9,671 Why is the speed of light the same in all frames of reference? The first thing to worry about here is that when you... Aug4-12 07:19 PM bcrowell 2 10,451 Can I send a signal faster than light by pushing a rigid rod? One common proposal for achieving faster than light... Oct3-11 02:07 PM DaleSpam 0 11,138 How can light have momentum if it has zero mass? The relativistic expression for the momentum of a massive particle... Jul7-11 10:52 AM bcrowell 0 8,709 Why does c have a particular value, and can it change? Short answer: Because c has units, its value is what it... Jul2-11 12:29 PM bcrowell 0 6,559 Pinned: Rest frame of a photon I've read that in relativity the concept of the rest frame of a photon doesn't make sense. Why is that? A rest... Jan26-11 08:11 AM D H 0 9,355 In general relativity, gravitation is a manifestation of the curvature of spacetime. The motion of all objects is... Aug21-08 11:42 PM jtbell 0 7,750 Pinned: Do photons have mass? Do photons have mass? The quick answer: NO. However, this is where it gets a bit confusing for most people. This... Mar27-07 10:14 AM ZapperZ 0 19,132 Definition/Summary Time dilation is the factor by which an inertial observer measures another observer's clock as... Jul24-14 09:06 AM Greg Bernhardt 0 1,010 Definition/Summary The metric tensor g_{\mu\nu} is a 4x4 matrix that is determined by the curvature and coordinate... Jul24-14 09:05 AM Greg Bernhardt 0 286 Definition/Summary A Lorentz transformation is the relation between the coordinates of two inertial observers who... Jul24-14 09:04 AM Greg Bernhardt 0 277 Definition/Summary Where two particles very close together have the same velocities, their two geodesics are... Jul24-14 09:03 AM Greg Bernhardt 0 265 Definition/Summary The Einstein Field Equations are a set of ten differential equations which express the general... Jul24-14 09:01 AM Greg Bernhardt 0 257 Definition/Summary e = mc² is the formula relating mass to the total energy which could theoretically be produced... Jul24-14 09:00 AM Greg Bernhardt 0 257

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