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Special and General Relativity Forum

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.

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B Time dilation and Einstein's theorem

Jan 5, 2019 · Replies 58 · Mar 29, 2019

2

Replies: 58

Views: 7K

I Gravity Waves or Gravity Delay: Which Concept Explains Our Cosmic Stretching?

Mar 28, 2019 · Replies 4 · Mar 28, 2019

Replies: 4

Views: 2K

B Questions on Covariance and Contravariance of Vectors

Mar 26, 2019 · Replies 10 · Mar 27, 2019

Replies: 10

Views: 2K

I Gravitational Waves & Matter: Causes, Effects & Thresholds

Mar 26, 2019 · Replies 3 · Mar 26, 2019

Replies: 3

Views: 2K

I Free Particles & Geodesics: Do They Go Hand-in-Hand?

Mar 21, 2019 · Replies 20 · Mar 23, 2019

Replies: 20

Views: 2K

B How much time dilation is there as time passes?

Mar 20, 2019 · Replies 36 · Mar 22, 2019

2

Replies: 36

Views: 4K

Insights Fermi-Walker Transport in Kerr Spacetime - Comments

Mar 16, 2019 · Replies 2 · Mar 20, 2019

Replies: 2

Views: 2K

I Space-time curvature and the fabric of space

Feb 27, 2019 · Replies 13 · Mar 19, 2019

Replies: 13

Views: 3K

I Confusion about index notation and operations of GR

Mar 17, 2019 · Replies 8 · Mar 19, 2019

Replies: 8

Views: 3K

B Propagation of changes in a gravitational field

Mar 16, 2019 · Replies 31 · Mar 19, 2019

2

Replies: 31

Views: 3K

I Black hole orbital mechanics questions

Mar 9, 2019 · Replies 16 · Mar 18, 2019

Replies: 16

Views: 3K

Find the Tetrad for Kerr Metric: Step-by-Step Guide

Mar 11, 2019 · Replies 26 · Mar 17, 2019

Replies: 26

Views: 6K

A Penrose diagram of black hole with a changing event horizon

Mar 16, 2019 · Replies 3 · Mar 17, 2019

Replies: 3

Views: 3K

I Gravitational field versus acceleration

Mar 10, 2019 · Replies 20 · Mar 16, 2019

Replies: 20

Views: 2K

I Relativistic form of the displacement current using the Biot-Savart Law

Mar 8, 2019 · Replies 26 · Mar 16, 2019

Replies: 26

Views: 3K

B Can Atomic Clocks Yield the Same Time Dilation Equation as Light Clocks?

Mar 11, 2019 · Replies 38 · Mar 16, 2019

2

Replies: 38

Views: 4K

A Quantum amplitude for a particle falling into a black hole

Feb 22, 2019 · Replies 4 · Mar 15, 2019

Replies: 4

Views: 2K

B What happens to the matter inside a black hole?

Feb 18, 2019 · Replies 9 · Mar 15, 2019

Replies: 9

Views: 2K

I Why do particles around us have finite momenta?

Mar 14, 2019 · Replies 21 · Mar 15, 2019

Replies: 21

Views: 2K

I Can this event vary relatively?

Mar 12, 2019 · Replies 18 · Mar 15, 2019

Replies: 18

Views: 2K

I Maxwell's Equations in Different Lorentz Frames: Are They Equivalent?

Mar 10, 2019 · Replies 16 · Mar 14, 2019

Replies: 16

Views: 2K

I General Relativity and light deflection

Mar 12, 2019 · Replies 4 · Mar 13, 2019

Replies: 4

Views: 2K

A How Do You Calculate the D'Alembert Operator in a Given Metric for GR?

Mar 10, 2019 · Replies 9 · Mar 10, 2019

Replies: 9

Views: 5K

B Special Relativity: Time Measurements on Two Systems - Mike's Question

Mar 9, 2019 · Replies 6 · Mar 9, 2019

Replies: 6

Views: 2K

Insights Fermi-Walker Transport in Schwarzschild Spacetime - Comments

Mar 9, 2019 · Replies 0 · Mar 9, 2019

Replies: 0

Views: 2K

I Fermi-Walker: Showing Rotation in Plane of 4-Accel & 4-Vel

Mar 8, 2019 · Replies 7 · Mar 9, 2019

Replies: 7

Views: 2K

B Traveling using space curvature

Mar 7, 2019 · Replies 23 · Mar 8, 2019

Replies: 23

Views: 3K

B Speed of Light in a Medium: Explained

Mar 8, 2019 · Replies 3 · Mar 8, 2019

Replies: 3

Views: 2K

B Does a gyroscope bend spacetime?

Jan 19, 2019 · Replies 21 · Mar 8, 2019

Replies: 21

Views: 5K

I Finding Most General Form of Rindler Coordinates

Mar 6, 2019 · Replies 4 · Mar 6, 2019

Replies: 4

Views: 1K

B Understanding Entropy & Universe Expansion: A Beginner's Guide

Mar 5, 2019 · Replies 7 · Mar 6, 2019

Replies: 7

Views: 2K

A Extra Killing Vector Field in Kerr Spacetime?

Mar 6, 2019 · Replies 4 · Mar 6, 2019

Replies: 4

Views: 2K

I Electromagnetic Curr. in Curved Spacetime: Questions Answered

Mar 4, 2019 · Replies 12 · Mar 5, 2019

Replies: 12

Views: 2K

A Flow as a fluid-orthogonal foliation

Mar 3, 2019 · Replies 11 · Mar 5, 2019

Replies: 11

Views: 2K

B Star Lifespan Near Black Hole: Time Dilation & Energy

Mar 4, 2019 · Replies 1 · Mar 4, 2019

Replies: 1

Views: 1K

I Proper Acceleration: Why d^2x^α/dτ^2 is Not Ideal

Mar 4, 2019 · Replies 12 · Mar 4, 2019

Replies: 12

Views: 1K

I Maximally symmetric sub-manifold (2-sphere)

Mar 1, 2019 · Replies 25 · Mar 4, 2019

Replies: 25

Views: 2K

I On The Length of a Meter Stick

Mar 4, 2019 · Replies 19 · Mar 4, 2019

Replies: 19

Views: 2K

I Geodesics in 4D Spacetime: An Overview

Mar 2, 2019 · Replies 9 · Mar 3, 2019

Replies: 9

Views: 2K

B Time Dilation: Accelerating vs Inertial Frame

Mar 1, 2019 · Replies 5 · Mar 2, 2019

Replies: 5

Views: 2K

I How Does the Metric of a 4-D Spacetime Define Its Symmetry and Expansion?

Mar 2, 2019 · Replies 1 · Mar 2, 2019

Replies: 1

Views: 1K

I Measuring the Speed of Light: Time of Flight Experiments

Feb 27, 2019 · Replies 15 · Mar 1, 2019

Replies: 15

Views: 2K

B Any interest in a spacetime diagram generator?

Mar 1, 2019 · Replies 1 · Mar 1, 2019

Replies: 1

Views: 2K

B General Relativity: Finding Info on Interpretation

Feb 27, 2019 · Replies 5 · Feb 28, 2019

Replies: 5

Views: 2K

I Solving Special Relativity Problem w/ Two Spaceships

Feb 28, 2019 · Replies 3 · Feb 28, 2019

Replies: 3

Views: 2K

I Connecting Geodesic Curves and the Covariant Derivative

Feb 25, 2019 · Replies 11 · Feb 27, 2019

Replies: 11

Views: 2K

I Conservation of energy-momentum (tensor)

Feb 26, 2019 · Replies 22 · Feb 27, 2019

Replies: 22

Views: 3K

I Spacetime Curvature: Eliptical Orbital Paths & Keppler Laws

Feb 27, 2019 · Replies 5 · Feb 27, 2019

Replies: 5

Views: 2K

B Big Rip Theory & Black Holes: Relativity Explained

Feb 27, 2019 · Replies 2 · Feb 27, 2019

Replies: 2

Views: 2K

I Covariant derivative of tangent vector for geodesic

Feb 25, 2019 · Replies 14 · Feb 26, 2019

Replies: 14

Views: 3K

I Implication of length contraction

Feb 23, 2019 · Replies 17 · Feb 26, 2019

Replies: 17

Views: 3K

I Is my reasoning about commutators of vectors right?

Feb 26, 2019 · Replies 3 · Feb 26, 2019

Replies: 3

Views: 1K

I Is there a zero-mass, vacuum Schwarzschild GR solution?

Feb 23, 2019 · Replies 27 · Feb 25, 2019

Replies: 27

Views: 3K

I Schwarzschild metric not dependent on time

Feb 20, 2019 · Replies 58 · Feb 25, 2019

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Replies: 58

Views: 5K

I Contravariant Vector Transformation in Spherical Polar Coordinates

Feb 24, 2019 · Replies 13 · Feb 25, 2019

Replies: 13

Views: 2K

I Parallel transport of tangent vector....(geodesic)

Feb 25, 2019 · Replies 12 · Feb 25, 2019

Replies: 12

Views: 3K

I Perturbation to Flat Space Metric: Geodesic Equation

Feb 23, 2019 · Replies 6 · Feb 24, 2019

Replies: 6

Views: 2K

B Solving an Integral on a Spherical Surface - Tips

Feb 22, 2019 · Replies 1 · Feb 23, 2019

Replies: 1

Views: 1K

A Riemann Tensor Notation Explained | Choquet-Bruhat GR

Feb 23, 2019 · Replies 1 · Feb 23, 2019

Replies: 1

Views: 1K

I Speed of Light Measured by Jupiter's Moons: Error 26%?

Feb 23, 2019 · Replies 6 · Feb 23, 2019

Replies: 6

Views: 2K

B Rocket Sends Light to Mirror: Event A to Event C Diagram

Feb 21, 2019 · Replies 12 · Feb 22, 2019

Replies: 12

Views: 1K

B Can event horizons cross for passing black holes at high speed

Feb 19, 2019 · Replies 24 · Feb 21, 2019

Replies: 24

Views: 4K

I Confusion about Simultaneous Events in Relativity

Feb 17, 2019 · Replies 13 · Feb 20, 2019

Replies: 13

Views: 3K

I Bending of light - Newton vs. Einstein

Feb 19, 2019 · Replies 22 · Feb 20, 2019

Replies: 22

Views: 3K

B Converting between frames of reference

Feb 20, 2019 · Replies 19 · Feb 20, 2019

Replies: 19

Views: 3K

B Newtonian vs. Relativistic momentum

Feb 9, 2019 · Replies 19 · Feb 20, 2019

Replies: 19

Views: 4K

I Frame Dragging Effect vs Spin Orbit Coupling in GR

Feb 18, 2019 · Replies 8 · Feb 19, 2019

Replies: 8

Views: 2K

I Schwarzschild: Energy Conservation at Finite r

Feb 19, 2019 · Replies 1 · Feb 19, 2019

Replies: 1

Views: 1K

B Time Dilation Problem with Mesons

Dec 18, 2018 · Replies 39 · Feb 18, 2019

2

Replies: 39

Views: 7K

A Foliation of spacetime into spacelike hypersurfaces

May 5, 2017 · Replies 6 · Feb 18, 2019

Replies: 6

Views: 3K

I Inertial Ref: Can Light Photons Be a Privileged Frame?

Feb 15, 2019 · Replies 9 · Feb 17, 2019

Replies: 9

Views: 2K

I Books on Spacetime Hypersurfaces & Foliations of Space Time

Feb 16, 2019 · Replies 2 · Feb 17, 2019

Replies: 2

Views: 2K

I Is Absolute Position Necessary to Understand Relativity?

Feb 17, 2019 · Replies 5 · Feb 17, 2019

Replies: 5

Views: 1K

Insights Solving Einstein's Field Equations in Maxima - Comments

May 13, 2018 · Replies 4 · Feb 15, 2019

Replies: 4

Views: 3K

I Gamma in Brans-Dicke framework

Feb 15, 2019 · Replies 5 · Feb 15, 2019

Replies: 5

Views: 1K

A Killing vectors corresponding to the Lorentz transformations

Feb 13, 2019 · Replies 6 · Feb 15, 2019

Replies: 6

Views: 3K

I Symmetric Connection: Does Torsion Vanish?

Feb 14, 2019 · Replies 3 · Feb 15, 2019

Replies: 3

Views: 2K

I What are the metric components in the Brans-Dicke action?

Feb 14, 2019 · Replies 14 · Feb 14, 2019

Replies: 14

Views: 2K

I GR: Electric & Magnetic Effects - Consequences

Feb 14, 2019 · Replies 7 · Feb 14, 2019

Replies: 7

Views: 2K

I Einstein-Hilbert Action, Lagrangian Density & Vacuum Fields

Feb 14, 2019 · Replies 1 · Feb 14, 2019

Replies: 1

Views: 1K

I Relativistic mass and gravitational potential

Feb 13, 2019 · Replies 6 · Feb 14, 2019

Replies: 6

Views: 2K

B Presentation of mass as a physical quantity

Feb 2, 2019 · Replies 4 · Feb 13, 2019

Replies: 4

Views: 5K

I Acceleration of a relativistic particle

Feb 13, 2019 · Replies 7 · Feb 13, 2019

Replies: 7

Views: 2K

I Is this answer about Lorentz transforms correct?

Feb 11, 2019 · Replies 5 · Feb 13, 2019

Replies: 5

Views: 2K

B Time Dilation and thermal motion

Feb 9, 2019 · Replies 18 · Feb 10, 2019

Replies: 18

Views: 2K

I Allowed fields in General Relativity

Feb 6, 2019 · Replies 14 · Feb 9, 2019

Replies: 14

Views: 2K

I Uniqueness theorems for black holes

Feb 5, 2019 · Replies 12 · Feb 8, 2019

Replies: 12

Views: 2K

I Invariance of timelike Killing vector of Schwarzschild sol.

Feb 7, 2019 · Replies 3 · Feb 7, 2019

Replies: 3

Views: 2K

I Can the Lorentz factor be modified for non-inertial frames?

Feb 5, 2019 · Replies 12 · Feb 7, 2019

Replies: 12

Views: 3K

B Spacetime curvature due to acceleration causing gravity?

Feb 5, 2019 · Replies 41 · Feb 6, 2019

2

Replies: 41

Views: 5K

I Cosmological Constant Term in Einstein Equations

Feb 5, 2019 · Replies 2 · Feb 6, 2019

Replies: 2

Views: 2K

I General Relativity rocket puzzle

Jan 31, 2019 · Replies 84 · Feb 5, 2019

3

Replies: 84

Views: 7K

I What happens to the energy lost by photons in gravity?

Nov 1, 2018 · Replies 38 · Feb 5, 2019

2

Replies: 38

Views: 5K

B Is the Space with Ricci Scalar Zero Flat?

Feb 2, 2019 · Replies 16 · Feb 5, 2019

Replies: 16

Views: 4K

I Gravitational wave interference

Feb 2, 2019 · Replies 9 · Feb 5, 2019

Replies: 9

Views: 3K

I Question about the limits of space contraction near light speed

Feb 4, 2019 · Replies 10 · Feb 4, 2019

Replies: 10

Views: 2K

I Is Simultaneity in Einstein's Thought Experiment a Matter of Perspective?

Feb 1, 2019 · Replies 22 · Feb 2, 2019

Replies: 22

Views: 2K

I Calculating Acceleration of Gravity w/ Geodesic Deviation: Troubleshooting

Jan 24, 2019 · Replies 22 · Feb 1, 2019

Replies: 22

Views: 5K

B How did Einstein come up with the thought of a space fabric?

Jan 31, 2019 · Replies 18 · Feb 1, 2019

Replies: 18

Views: 3K

I Legendre Transform: Momentum & Velocity

Jan 31, 2019 · Replies 2 · Feb 1, 2019

Replies: 2

Views: 2K

Relativity

The theory of relativity, formulated by Albert Einstein, comprises two fundamental theories—special and general relativity. Special relativity, proposed in 1905, redefines our understanding of space and time by asserting the constancy of the speed of light for all observers and introducing concepts like time dilation and length contraction.

General relativity, presented in 1915, extends these principles to incorporate gravity. It describes gravity as the curvature of spacetime caused by massive objects, leading to phenomena like gravitational time dilation and the prediction of black holes. Einstein's equations have been consistently validated through experiments and observations, profoundly influencing our comprehension of the universe's fabric and dynamics.

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