Special and General Relativity Forum

Post thread
Join in expert discussion on special and general relativity discussion. Relativity is the dependence of various physical phenomena on relative motion of the observer and the observed objects.
Undergrad Can a human travel to distant stars? And other questions.
  • · Replies 24 ·
Replies
24
Views
5K
Graduate Solving the Assassin Paradox: A Q&A with Adrian
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What is the effect of a neutron star's gravity on vertical rays of light?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Twin Paradox: Who is Older - B or C?
  • · Replies 16 ·
Replies
16
Views
4K
Graduate Usefulness of Kretschmann scalar
  • · Replies 5 ·
Replies
5
Views
4K
High School List of different relative speeds?
  • · Replies 13 ·
Replies
13
Views
4K
High School If light hits a mirror and then switches direction
  • · Replies 5 ·
Replies
5
Views
3K
Graduate FTL implies Backward Time Effect
  • · Replies 13 ·
Replies
13
Views
4K
Graduate About dark matter and the limits of the universe.
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Why cant an object travel faster than the speed of light?
  • · Replies 13 ·
Replies
13
Views
5K
Graduate What are the differences between an object with mass 0 and mass > 0 ?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate What Do Upper and Lower Indices in Tensor Notation Signify?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Einstein's original 'thought experiment'
  • · Replies 19 ·
Replies
19
Views
5K
Graduate Relativistic doppler effect - inconsistency in my derivations
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Questions about the speed of light
  • · Replies 6 ·
Replies
6
Views
3K
Graduate 2nd order correction to gauge transformation
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Does Time Dilation Apply to the Big Bang's Mass?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate The speed of light and the mass of a photon
  • · Replies 24 ·
Replies
24
Views
6K
Graduate Wald's definition of the Cauchy Horizon
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What if speed limit is slightly faster than light?
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Redshift and Weak equivalence principle
  • · Replies 10 ·
Replies
10
Views
3K
Graduate What is the Metric Tensor and How is it Used in Tensors?
  • · Replies 52 ·
2
Replies
52
Views
9K
High School Explaining Causality: How and Why it Works
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Noob question about lorentz factor
  • · Replies 6 ·
Replies
6
Views
3K
Graduate How do accelerometers measure acceleration without using relative motion?
  • · Replies 38 ·
2
Replies
38
Views
7K
Graduate How Does Gravity Store Arbitrarily Negative Energy?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate How to explain time dilation easily to others, maybe like this ?
  • · Replies 19 ·
Replies
19
Views
11K
Graduate Derivation of relativistic acceleration and momentum
  • · Replies 13 ·
Replies
13
Views
17K
Graduate Variational methods on Lagrangians (D'Inverno Chapter 11) - continued
  • · Replies 21 ·
Replies
21
Views
6K
Graduate The Illusion of Time and distant observers
  • · Replies 20 ·
Replies
20
Views
8K
Graduate Black holes and time dilation around the event horizon
  • · Replies 38 ·
2
Replies
38
Views
9K
Graduate Speed of light - why is it a constant?
  • · Replies 53 ·
2
Replies
53
Views
11K
Graduate Reflecting light seen by two moving persons, explanation already known?
  • · Replies 20 ·
Replies
20
Views
6K
Undergrad Measuring Distance to a Star One Light Year Away at 0.5c Speed
  • · Replies 2 ·
Replies
2
Views
3K
Graduate You approach a planet at a velocity near c, what do you see?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Is Time Speeding Up? The Possibility of a Universally Accelerating Clock
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Is SR and GR Time Dilation the same thing?
  • · Replies 50 ·
2
Replies
50
Views
10K
Graduate Mathematical Basis for Learning Relativity
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Can time slow down infinitely in black holes?
  • · Replies 6 ·
Replies
6
Views
5K
Graduate Question about Brian Greene's wormhole illustration in Fabirc of the Cosmos
  • · Replies 7 ·
Replies
7
Views
8K
Graduate Length contraction and accelerating frames
  • · Replies 2 ·
Replies
2
Views
3K
Graduate How does relativity explain the different experiences of now for two observers?
  • · Replies 18 ·
Replies
18
Views
22K
Graduate Why so many definitions of an inertial frame?
  • · Replies 13 ·
Replies
13
Views
4K
Graduate Scientific measurement standards
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Can Quantum Entanglement Enable Time Loops and Superluminal Communication?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate What Are Lapse Functions in 3+1 General Relativity?
  • · Replies 1 ·
Replies
1
Views
8K
Undergrad Time Dilation - Relative to Light Speed or Reference Point - I'm Confused?
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Is there really an absolute reference frame?
  • · Replies 22 ·
Replies
22
Views
10K
Undergrad Is it Possible for A to See B Moving Faster?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Finding Equations of Motion from the Stress Energy Tensor
  • · Replies 49 ·
2
Replies
49
Views
13K
Graduate Why Is General Relativity Hard to Work With?
  • · Replies 2 ·
Replies
2
Views
6K
Graduate Symmetry in special relativity
  • · Replies 9 ·
Replies
9
Views
4K
Graduate The Lorentz Transformations and a Few Concerns
  • · Replies 43 ·
2
Replies
43
Views
11K
Graduate Triplet paradox: where's the error in my logic?
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Does Relativistic Mass Change at the Speed of Light?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate How does the Twin Paradox demonstrate the effects of general relativity?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Twin Paradox Explanation Needed
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Precession of the LRL Vector in SR
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Different values for the inertia of a moving object?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Going back in space vs Going back in time
  • · Replies 14 ·
Replies
14
Views
4K
Graduate Acceleration thought experiment
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Michelson-Morley experiment doubts
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Is SOL infinite? (from its own point of view)
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad Newton's Second Law: Acceleration Proportional to Force
  • · Replies 20 ·
Replies
20
Views
4K
Graduate What happens when objects travel at the speed of light?
  • · Replies 21 ·
Replies
21
Views
4K
Graduate The unit vector normal to the curvature of spacetime
  • · Replies 8 ·
Replies
8
Views
5K
Graduate No Such Thing as the Plank Length?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Does Light Lose Energy and Change Frequency Due to Gravitational Waves?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What Does It Mean to Be at Rest Relative to the CMB?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate What Causes the Negative Sign in the Schwarzschild Metric Lagrangian?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Gravitational Time Dilation and Contradicting Physical Events
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Time dilatation and 'now slices'
  • · Replies 3 ·
Replies
3
Views
10K
Graduate How does gravity travel faster than the speed of light in a gravitational field?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate What Happens When Both Objects Travel at c?
  • · Replies 20 ·
Replies
20
Views
4K
Graduate Reaching the Rindler horizon in a finite proper time
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Is the Distance Traveled by Light Affected by Time Dilation?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Charge Invariance & Mass Dependence: Lorentz Transformations
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Accelerated observors in flat space
  • · Replies 17 ·
Replies
17
Views
4K
Graduate Gravitational lensing and red shift
  • · Replies 4 ·
Replies
4
Views
6K
Undergrad Relativity: Impossible Scenario?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Solutions to the space-time metric
  • · Replies 5 ·
Replies
5
Views
2K
Graduate So gravity obviously is the differing rates of expansion of Matter vs
  • · Replies 21 ·
Replies
21
Views
3K
Undergrad Speed of light and time dilation
  • · Replies 18 ·
Replies
18
Views
5K
Graduate The zeroth component of the four-momentum
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Can a Black Hole Have Angular Momentum?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Pondering basis vectors and one forms
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Is Absolute Zero Velocity Possible?
  • · Replies 24 ·
Replies
24
Views
6K
Graduate Elegant Universe: Example of motion's effect on space
  • · Replies 4 ·
Replies
4
Views
2K
Graduate What is the significance of square brackets in tensor notation?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Is general relativity generally covariant?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What Should a Good Theory of Gravity Explain?
  • · Replies 25 ·
Replies
25
Views
6K
Graduate Could time as a dimension have property that would behave like energy ?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Relation between affine parameters
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Formula of doppler effect for sound,relativistic?
  • · Replies 17 ·
Replies
17
Views
5K
Graduate Time dilations: How do we actually see things?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Why can we explain gravity geometrically but not EM force?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Good resources for integrals in Four-Space?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Special relativity under the inflation of spacetime
  • · Replies 7 ·
Replies
7
Views
3K
Graduate What Makes Photons, Bosons, and Gluons Massless?
  • · Replies 6 ·
Replies
6
Views
4K
Graduate Is the Lense-Thirring effect evidence for Mach's principle?
  • · Replies 14 ·
Replies
14
Views
3K