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.
Graduate My Theory of Gravity: Mass Causes Time Dilation & Attraction
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Horizon for Constant Acceleration - Special Relativity
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Confused about Equivalence Principle
  • · Replies 17 ·
Replies
17
Views
3K
Graduate Are Time-Traveling Photons a Real Scientific Concept?
  • · Replies 13 ·
Replies
13
Views
3K
Graduate Behavior of a tangent light beam to an event horizon?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Electromagnetic version of the positive energy theorem?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Derivation of Wormhole Mouth Mass/Charge?
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Speedy ship flies through the sun
  • · Replies 13 ·
Replies
13
Views
3K
Graduate Conceptual GR question (regarding orbit paths)
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Special Relativity Time Travel to Future - Could You Watch the News on Earth?
  • · Replies 2 ·
Replies
2
Views
2K
High School Gravity reaches across space and apparently reaches across time.
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Mass warping time, question/ interpretation
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Can Artificial Gravitational Fields Create Wormholes for Space Travel?
  • · Replies 4 ·
Replies
4
Views
5K
Graduate The trivial constant force acceleration math
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Explaining E=M C^2 to 14 year olds ?
  • · Replies 22 ·
Replies
22
Views
12K
Graduate Understanding Penrose Diagrams - Insight & Explanation
  • · Replies 1 ·
Replies
1
Views
4K
Undergrad Constancy of the speed of light
  • · Replies 12 ·
Replies
12
Views
5K
Graduate [help]how to obtain gravity eqution from gravity field Action S?
  • · Replies 3 ·
Replies
3
Views
4K
Graduate Twin Paradox (I know not again)
  • · Replies 2 ·
Replies
2
Views
2K
Graduate What Happens to Light When a Flashlight Hits an Asteroid?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate The doppler radar trap paradox on the path to gravity.
  • · Replies 108 ·
4
Replies
108
Views
16K
Graduate Does an observer on a carousel see a horizon?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Are Scientific Equations Only Valid for Certain Scales in Physics?
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad A thing that confuses me (quasi-paradox)
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Significance of Special Relativity
  • · Replies 6 ·
Replies
6
Views
8K
Graduate How Does Earth's Curvature Affect the Ratio of Gravity?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad What causes the gravitational redshift phenomenon?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Gravity: Time Dilation or Death
  • · Replies 2 ·
Replies
2
Views
2K
Graduate What Makes the Speed of Light Constant in Special Relativity?
  • · Replies 15 ·
Replies
15
Views
3K
Graduate Is General Relativity Based on General Relativity or Equivalence?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad From Kepler's law to gravitation force
  • · Replies 7 ·
Replies
7
Views
4K
Graduate Understanding SR: A Travelling Observer & Photons
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad Time as Dimension: Before & After Einstein's G.T.R.
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Compact Sapcetime and Time Travel
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Are Time and Space Independent of Objects?
  • · Replies 13 ·
Replies
13
Views
2K
Graduate Is Gravity Truly a 3D Phenomenon?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate How Do FRW Coordinates Transform SR Effects in Cosmology?
  • · Replies 56 ·
2
Replies
56
Views
10K
Undergrad Gravitational Time Dilation - Confused
  • · Replies 42 ·
2
Replies
42
Views
12K
Undergrad Sun Bending Light: Gravity Warps Space-Time?
  • · Replies 53 ·
2
Replies
53
Views
19K
Graduate Verify special relativity by concept light clock
  • · Replies 18 ·
Replies
18
Views
8K
Graduate Is speed of time c, atleast for someone travelling at speed of light?
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Can We Really Travel Back to Our Own Past?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Lorentz Transformation & Hyperbolic Angle in (2+1) Dimensions
  • · Replies 7 ·
Replies
7
Views
3K
Graduate The Twin Paradox and Absolute Reference Frames in General Relativity
  • · Replies 5 ·
Replies
5
Views
2K
Graduate What Are the Paradoxes of Special Theory of Relativity?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Kerr metric, singularities in Boyer-Lindquist and Cartesian coordinates
  • · Replies 1 ·
Replies
1
Views
4K
Undergrad Why Do We Use Arbitrary Units for the Speed of Light?
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Principle of Relativity and Constancy of Light
  • · Replies 24 ·
Replies
24
Views
5K
Graduate The Mystery: The Truth about Time Shifts in Wormholes
  • · Replies 6 ·
Replies
6
Views
4K
Graduate A little paradox in relativity.
  • · Replies 24 ·
Replies
24
Views
4K
Graduate Length contraction: a question about tramwheels
  • · Replies 3 ·
Replies
3
Views
2K
High School Is the speed of light a velocity or acceleration?
  • · Replies 18 ·
Replies
18
Views
9K
Graduate Why is faster than light travel so bizarrely 'addressed'
  • · Replies 47 ·
2
Replies
47
Views
10K
Graduate Magnetic Relativity: Does a Force Act?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Why Does the Twin Paradox Not Prove Einstein's Relativity Wrong?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What exactly is meant when people say that a Light Cone is tilting ?
  • · Replies 6 ·
Replies
6
Views
5K
Graduate What is the Relationship Between Proper Time and Coordinate Time in Black Holes?
  • · Replies 103 ·
4
Replies
103
Views
14K
Graduate Is there time at the speed of light?
  • · Replies 17 ·
Replies
17
Views
8K
Undergrad Gravitational Force between two bodies when Distance is zero
  • · Replies 9 ·
Replies
9
Views
9K
Graduate The Relativity of Simultaneity
  • · Replies 22 ·
Replies
22
Views
5K
Graduate Kretschmann Scalar: Flat Spacetime & Singularities
  • · Replies 3 ·
Replies
3
Views
5K
Graduate What Are the Limitations of the Balloon Analogy in Cosmology?
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Twistors but I don't think his projection created a compacted space
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Electromagnetic General Relativity
  • · Replies 18 ·
Replies
18
Views
6K
Time Travel Theory: What Are Your Thoughts?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate How Light Travels Across Space at Velocity C
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Can a wormhole cause time to slow down and age differently for travelers?
  • · Replies 15 ·
Replies
15
Views
4K
Graduate General theory of relativity space without ether is unthinkable
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Understanding the Stress-Energy Tensor
  • · Replies 7 ·
Replies
7
Views
10K
Graduate Constant velocity vs accelerating source
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Why isn't gravity the result of a variable speed of light?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate EPR Paradox and implications for QM
  • · Replies 4 ·
Replies
4
Views
3K
High School A question about special relativity,
  • · Replies 15 ·
Replies
15
Views
7K
Undergrad Gravity and Energy: Mass, Velocity, and More
  • · Replies 2 ·
Replies
2
Views
2K
Graduate What is the definition of a metric tensor?
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Why Does Length Contraction Happen?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How Is the Inner Radius of an Accretion Disc Determined?
  • · Replies 1 ·
Replies
1
Views
4K
Undergrad Can the Twin Paradox Be Proven?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Why Can't There Be Gravity in 2 Spatial Dimensions?
  • · Replies 2 ·
Replies
2
Views
5K
Undergrad Cosmological Constant: Significance & "God" Particle
  • · Replies 7 ·
Replies
7
Views
3K
Graduate A dark part of special relativity(at least for me)
  • · Replies 28 ·
Replies
28
Views
4K
Graduate Spatial curvature in Schwarzschild & FRW
  • · Replies 1 ·
Replies
1
Views
4K
Graduate Effect before Cause:absolute horizon
  • · Replies 10 ·
Replies
10
Views
3K
Graduate SRT two observers will agree on their relative velocity
  • · Replies 4 ·
Replies
4
Views
2K
High School Physics Q: Time If Everything Stops Except Clock?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Vectors and the Speed of Light?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Understanding Relativity: Explaining Inertial Mass and the Speed of Light
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What Defines Unstable Versus Unbound Orbits Around Black Holes?
  • · Replies 3 ·
Replies
3
Views
7K
Graduate How Does Space Motion Affect Light Measurement Observations?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate A different take on the Schwarzschild Metric
  • · Replies 2 ·
Replies
2
Views
3K
Graduate How does time dilation really work?
  • · Replies 17 ·
Replies
17
Views
5K
Graduate An idea on explaining the weak equivalence principle
  • · Replies 25 ·
Replies
25
Views
4K
Graduate Breaking Light and Einstein-Rosen Bridges?
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Are there other Lorentz invariant bilinear combinations of E and B?
  • · Replies 9 ·
Replies
9
Views
3K
High School Ages of A & B: Unbelievable Difference?
  • · Replies 24 ·
Replies
24
Views
4K
Graduate Understanding Length Contraction and Time Dilation
  • · Replies 10 ·
Replies
10
Views
4K
Graduate Help with a really nerdy calculation?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Photon/particle's energy in General Relativity
  • · Replies 7 ·
Replies
7
Views
4K
Graduate Faster than the speed of light with only a fishing line
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Role of Exclusion principle in formation of black holes.
  • · Replies 1 ·
Replies
1
Views
2K