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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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Graduate Deriving Relativistic Boltzmann Equation | Theory Physics MSc Thesis

Apr 1, 2019 · Replies 3 · Apr 5, 2019

Replies: 3

Views: 2K

High School Is the Universe Moving in Circular Patterns Within the 4th Dimension?

Apr 5, 2019 · Replies 2 · Apr 5, 2019

Replies: 2

Views: 4K

Graduate Mass of Hadrons: Verifying Special Relativity

Apr 3, 2019 · Replies 8 · Apr 4, 2019

Replies: 8

Views: 1K

Undergrad Is the Delta Function a Scalar?

Apr 3, 2019 · Replies 1 · Apr 3, 2019

Replies: 1

Views: 2K

Undergrad Fastest Cause & Effect: Electric Field & Magnetic Field

Mar 27, 2019 · Replies 7 · Apr 3, 2019

Replies: 7

Views: 2K

Undergrad Conserved Stress-Energy in Gravitational Theories

Apr 1, 2019 · Replies 6 · Apr 2, 2019

Replies: 6

Views: 2K

Undergrad Determining c from Maxwell's Equations

Nov 22, 2016 · Replies 31 · Apr 1, 2019

2

Replies: 31

Views: 9K

High School Magnetic field and moving charge special relativity

Mar 29, 2019 · Replies 7 · Mar 31, 2019

Replies: 7

Views: 3K

Undergrad Invariance of Action: Lagrangian Transformation

Mar 28, 2019 · Replies 3 · Mar 30, 2019

Replies: 3

Views: 2K

Graduate Equations for computing null geodesics in Schwarzschild spacetime

Mar 30, 2019 · Replies 8 · Mar 30, 2019

Replies: 8

Views: 4K

High School Coulomb force over Rindler horizon

Mar 13, 2019 · Replies 31 · Mar 29, 2019

2

Replies: 31

Views: 4K

High School Time dilation and Einstein's theorem

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

2

Replies: 58

Views: 8K

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

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

Replies: 4

Views: 2K

High School Questions on Covariance and Contravariance of Vectors

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

Replies: 10

Views: 2K

Undergrad Gravitational Waves & Matter: Causes, Effects & Thresholds

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

Replies: 3

Views: 2K

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

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

Replies: 20

Views: 2K

High School 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

Undergrad Space-time curvature and the fabric of space

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

Replies: 13

Views: 3K

Undergrad Confusion about index notation and operations of GR

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

Replies: 8

Views: 3K

High School Propagation of changes in a gravitational field

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

2

Replies: 31

Views: 3K

Undergrad Black hole orbital mechanics questions

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

Replies: 16

Views: 3K

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

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

Replies: 26

Views: 6K

Graduate Penrose diagram of black hole with a changing event horizon

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

Replies: 3

Views: 3K

Undergrad Gravitational field versus acceleration

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

Replies: 20

Views: 2K

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

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

Replies: 26

Views: 3K

High School 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

Graduate Quantum amplitude for a particle falling into a black hole

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

Replies: 4

Views: 2K

High School What happens to the matter inside a black hole?

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

Replies: 9

Views: 2K

Undergrad Why do particles around us have finite momenta?

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

Replies: 21

Views: 2K

Undergrad Can this event vary relatively?

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

Replies: 18

Views: 2K

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

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

Replies: 16

Views: 2K

Undergrad General Relativity and light deflection

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

Replies: 4

Views: 2K

Undergrad Solving for Gravity Without Gravitational Constant - Little g vs Big G

Mar 10, 2019 · Replies 17 · Mar 11, 2019

Replies: 17

Views: 2K

Graduate 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

High School 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

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

Mar 8, 2019 · Replies 7 · Mar 9, 2019

Replies: 7

Views: 2K

High School Traveling using space curvature

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

Replies: 23

Views: 3K

High School Speed of Light in a Medium: Explained

Mar 8, 2019 · Replies 3 · Mar 8, 2019

Replies: 3

Views: 2K

High School Does a gyroscope bend spacetime?

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

Replies: 21

Views: 5K

Undergrad Finding Most General Form of Rindler Coordinates

Mar 6, 2019 · Replies 4 · Mar 6, 2019

Replies: 4

Views: 1K

High School Understanding Entropy & Universe Expansion: A Beginner's Guide

Mar 5, 2019 · Replies 7 · Mar 6, 2019

Replies: 7

Views: 2K

Graduate Extra Killing Vector Field in Kerr Spacetime?

Mar 6, 2019 · Replies 4 · Mar 6, 2019

Replies: 4

Views: 2K

Undergrad Electromagnetic Curr. in Curved Spacetime: Questions Answered

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

Replies: 12

Views: 2K

Graduate Flow as a fluid-orthogonal foliation

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

Replies: 11

Views: 2K

High School Star Lifespan Near Black Hole: Time Dilation & Energy

Mar 4, 2019 · Replies 1 · Mar 4, 2019

Replies: 1

Views: 1K

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

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

Replies: 12

Views: 1K

Undergrad Maximally symmetric sub-manifold (2-sphere)

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

Replies: 25

Views: 2K

Undergrad On The Length of a Meter Stick

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

Replies: 19

Views: 2K

Undergrad Geodesics in 4D Spacetime: An Overview

Mar 2, 2019 · Replies 9 · Mar 3, 2019

Replies: 9

Views: 2K

High School Time Dilation: Accelerating vs Inertial Frame

Mar 1, 2019 · Replies 5 · Mar 2, 2019

Replies: 5

Views: 2K

Undergrad 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

Undergrad Measuring the Speed of Light: Time of Flight Experiments

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

Replies: 15

Views: 2K

High School Any interest in a spacetime diagram generator?

Mar 1, 2019 · Replies 1 · Mar 1, 2019

Replies: 1

Views: 2K

High School General Relativity: Finding Info on Interpretation

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

Replies: 5

Views: 2K

Undergrad Solving Special Relativity Problem w/ Two Spaceships

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

Replies: 3

Views: 2K

Undergrad Connecting Geodesic Curves and the Covariant Derivative

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

Replies: 11

Views: 2K

Undergrad Conservation of energy-momentum (tensor)

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

Replies: 22

Views: 3K

Undergrad Spacetime Curvature: Eliptical Orbital Paths & Keppler Laws

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

Replies: 5

Views: 2K

High School Big Rip Theory & Black Holes: Relativity Explained

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

Replies: 2

Views: 2K

Undergrad Covariant derivative of tangent vector for geodesic

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

Replies: 14

Views: 3K

Undergrad Implication of length contraction

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

Replies: 17

Views: 3K

Undergrad Is my reasoning about commutators of vectors right?

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

Replies: 3

Views: 1K

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

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

Replies: 27

Views: 3K

Undergrad Schwarzschild metric not dependent on time

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

2

Replies: 58

Views: 5K

Undergrad Contravariant Vector Transformation in Spherical Polar Coordinates

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

Replies: 13

Views: 2K

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

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

Replies: 12

Views: 3K

Undergrad Perturbation to Flat Space Metric: Geodesic Equation

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

Replies: 6

Views: 2K

High School Solving an Integral on a Spherical Surface - Tips

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

Replies: 1

Views: 1K

Graduate Riemann Tensor Notation Explained | Choquet-Bruhat GR

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

Replies: 1

Views: 1K

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

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

Replies: 6

Views: 2K

High School Rocket Sends Light to Mirror: Event A to Event C Diagram

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

Replies: 12

Views: 1K

High School Can event horizons cross for passing black holes at high speed

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

Replies: 24

Views: 4K

Undergrad Confusion about Simultaneous Events in Relativity

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

Replies: 13

Views: 3K

Undergrad Bending of light - Newton vs. Einstein

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

Replies: 22

Views: 3K

High School Converting between frames of reference

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

Replies: 19

Views: 3K

High School Newtonian vs. Relativistic momentum

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

Replies: 19

Views: 4K

Undergrad Frame Dragging Effect vs Spin Orbit Coupling in GR

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

Replies: 8

Views: 2K

Undergrad Schwarzschild: Energy Conservation at Finite r

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

Replies: 1

Views: 1K

High School Time Dilation Problem with Mesons

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

2

Replies: 39

Views: 8K

Graduate Foliation of spacetime into spacelike hypersurfaces

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

Replies: 6

Views: 3K

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

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

Replies: 9

Views: 2K

Undergrad Books on Spacetime Hypersurfaces & Foliations of Space Time

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

Replies: 2

Views: 2K

Undergrad 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

Undergrad Gamma in Brans-Dicke framework

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

Replies: 5

Views: 1K

Graduate Killing vectors corresponding to the Lorentz transformations

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

Replies: 6

Views: 3K

Undergrad Symmetric Connection: Does Torsion Vanish?

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

Replies: 3

Views: 2K

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

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

Replies: 14

Views: 2K

Undergrad GR: Electric & Magnetic Effects - Consequences

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

Replies: 7

Views: 2K

Undergrad Einstein-Hilbert Action, Lagrangian Density & Vacuum Fields

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

Replies: 1

Views: 1K

Undergrad Relativistic mass and gravitational potential

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

Replies: 6

Views: 2K

High School Presentation of mass as a physical quantity

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

Replies: 4

Views: 5K

Undergrad Acceleration of a relativistic particle

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

Replies: 7

Views: 2K

Undergrad Is this answer about Lorentz transforms correct?

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

Replies: 5

Views: 2K

High School Time Dilation and thermal motion

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

Replies: 18

Views: 2K

Undergrad Allowed fields in General Relativity

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

Replies: 14

Views: 2K

Undergrad Uniqueness theorems for black holes

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

Replies: 12

Views: 2K

Undergrad Invariance of timelike Killing vector of Schwarzschild sol.

Feb 7, 2019 · Replies 3 · Feb 7, 2019

Replies: 3

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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