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.
Threads
Undergrad Definition of Rindler Horizon: A Global View
- PAllen
- · Replies 10 ·
Undergrad Absolute meaning of spatial deviaton angle of light around the sun
- wnvl2
- · Replies 2 ·
Graduate Rindler Horizon Subtleties: Advanced Discussion
- ergospherical
- · Replies 21 ·
Undergrad Bondi ##k##-factor concept from first principles
- Shirish
- · Replies 41 ·
High School Equivalence Principle and Rindler Horizons
- sbaker8688
- · Replies 36 ·
Insights Geodesic Congruences in FRW, Schwarzschild and Kerr Spacetimes
- ergospherical
- · Replies 8 ·
High School Free fall floating in a closed spaceship near a gravity source
- roineust
- · Replies 4 ·
High School Distance Length Contraction at Light Speed
- MikeeMiracle
- · Replies 1 ·
Undergrad Observer Inside Collapsing Shell
- Tomas Vencl
- · Replies 6 ·
Undergrad Reference Frame, Difference in Kinetic Energy, Fuel Consumed
- MattGeo
- · Replies 19 ·
High School Why does it require an infinite amount of energy to reach the speed of light?
- mucker
- · Replies 130 ·
High School Is there an inside to a Black Hole?
- stevil
- · Replies 63 ·
Undergrad Is acceleration absolute or relative - follow up
- cianfa72
- · Replies 38 ·
Undergrad Reference frame vs coordinate chart
- cianfa72
- · Replies 61 ·
Undergrad Uncover Traps in Spacetime Diagrams: Bob & Alice's Cases
- Freixas
- · Replies 33 ·
Undergrad Request for Input: 2D Minkowski Spacetime Diagram Generator
- Freixas
- · Replies 6 ·
Graduate Radial Excess Calc: GR, 4πGρ & R00
- Thytanium
- · Replies 16 ·
Undergrad Time Dilation on 3D Torus: Clock Speed & Why It Matters
- appot89
- · Replies 3 ·
Undergrad Detecting Gravitational Waves w/ Interferometers: Explained
- cianfa72
- · Replies 11 ·
Insights Relativity using the Bondi k-Calculus - Comments
- robphy
- · Replies 21 ·
Undergrad Gravitational Field of Electromagnetic Waves: How is it Generated?
- MartinG
- · Replies 8 ·
Insights Relativity Variables: Velocity, Doppler-Bondi k, and Rapidity - Comments
- robphy
- · Replies 13 ·
Undergrad A computation of an integral on page 344 of Schutz's textbook
- MathematicalPhysicist
- · Replies 4 ·
Undergrad Hafele-Keating Exp: Balancing SR Effects in Plane Ref Frame
- name123
- · Replies 54 ·
High School How does curvature of spacetime affect the motion of test particles?
- sqljunkey
- · Replies 3 ·
Undergrad Merging black holes: gravitational waves and information
- arusse02
- · Replies 12 ·
Undergrad Angle-Preserving Linear Transformations in 2D Space for Relativity
- Shirish
- · Replies 2 ·
Graduate Understanding Frame Fields in GR: A Beginner's Guide
- joneall
- · Replies 7 ·
Undergrad Time Dilation: Gravitational & Velocity Effects Explained
- ronald_hinh
- · Replies 8 ·
Graduate Orbiting spaceship just above a black hole horizon
- AndreiB
- · Replies 2 ·
Undergrad Conservation of momentum in a collision
- Grasshopper
- · Replies 67 ·
Undergrad Kinetic vs Gravitational Time Dilation: Perceived Speed
- Involute
- · Replies 5 ·
High School L = 0 in the equation for effective potential energy?
- sqljunkey
- · Replies 3 ·
High School Can't Avoid Invoking Preferred Frame: A Look at Free Falling Into a Black Hole
- Grinkle
- · Replies 6 ·
Undergrad Solving Spinorial Maxwell's Equations with Wald
- ergospherical
- · Replies 1 ·
Undergrad Synchronous Reference Frame: Definition and Usage
- cianfa72
- · Replies 16 ·
Undergrad Black hole formation watched from a distance
- haushofer
- · Replies 37 ·
Undergrad Proving Lorentz Metric on Real Type (1,0;1,0) Tensors in Wald Ch. 13
- ergospherical
- · Replies 2 ·
Undergrad Cartan's Understanding of Einstein Field Equation
- dx
- · Replies 1 ·
Undergrad Kerr Black Hole: Superradiance Flux - Show Negative when 0<ω<mΩH
- ergospherical
- · Replies 2 ·
Undergrad E Vector in E=mc2? Scalar Multiplication & Vectors
- andrecoelho
- · Replies 12 ·
Undergrad Relativistic Force & Velocity Relation to Acceleration
- lriuui0x0
- · Replies 20 ·
High School Time Dilation in a Galaxy: Calculating Mass Effects
- sha1000
- · Replies 7 ·
Undergrad Does Time Drive Black Hole Travelers to a Central Singularity?
- .Scott
- · Replies 13 ·
Undergrad How Long Does it Take to Fall into a Black Hole?
- Jackzim
- · Replies 43 ·
Undergrad GW detectors -- How much has their sensitivity improved since 2008?
- MathematicalPhysicist
- · Replies 1 ·
High School Understanding Spacetime Diagrams from "Reality is not What it Seems
- fee_de
- · Replies 6 ·
Undergrad Principle of relativity for proper accelerating frame of reference
- cianfa72
- · Replies 144 ·
Undergrad Shape of de Sitter Universe: Is Hyperboloid Misleading?
- gerald V
- · Replies 2 ·
Undergrad Time travel is a fact or fiction.?
- Zeeshan Ahmad
- · Replies 9 ·
High School Charged Particle on Earth's Surface: Will It Emit Radiation?
- Amaterasu21
- · Replies 13 ·
Undergrad Does time dilation occur due to the speed limit of light or c?
- mucker
- · Replies 47 ·
Undergrad Understanding Frequency in Rindler Coordinates for a Scalar Massless Field
- Haorong Wu
- · Replies 2 ·
High School Twin Paradox: Orbital Geodesics, Gravity, & Time Dilation
- D.S.Beyer
- · Replies 25 ·
Undergrad Future null infinity confusion
- Dale
- · Replies 30 ·
Undergrad Distinguishing Einstein Cartan from GR: Experiments
- Dale
- · Replies 5 ·
High School Time Dilation: Traveling to a Distant Star in 4.5yr
- versine
- · Replies 4 ·
Undergrad Rindler Transformation & 't Hooft's Introduction to General Relativity
- wnvl2
- · Replies 1 ·
High School Space-Time Expansion: Objects Accelerating Without Force?
- Martin Philpott
- · Replies 11 ·
High School How Matter Bends Space & Slows Time: Physical Mechanism
- TheTuringTester
- · Replies 11 ·
Undergrad Natural direction of pushforwards and pullbacks
- ergospherical
- · Replies 4 ·
Graduate Condition for a spacelike surface to be achronal
- PAllen
- · Replies 16 ·
Undergrad Classical Aberration Formula: Understanding & Application
- Kairos
- · Replies 7 ·
High School Photon Mass: Does Light Have Direction?
- Lucas Nunes Rosa
- · Replies 6 ·
Undergrad Information traveling faster than light? (thought experiment)
- kurosama
- · Replies 6 ·
Graduate A question on proper time in special relativity
- user1139
- · Replies 58 ·
Graduate Some algebra in Schutz's textbook
- MathematicalPhysicist
- · Replies 12 ·
Undergrad Understanding Papapetrou's Spinning Test Particles in GR
- ergospherical
- · Replies 2 ·
Undergrad Violation of Special Relativity Principle?
- PhysicsTruth
- · Replies 23 ·
Graduate M-Theory: Bosonic Fields - Need Help With Part III
- ergospherical
- · Replies 5 ·
Undergrad Is Spacetime Curvature Misunderstood in Eddington's Experiment?
- Carpe Physicum
- · Replies 29 ·
Undergrad Purpose of Tensors, Indices in Tensor Calculus Explained
- AndersF
- · Replies 10 ·
Undergrad Parallel Transport of a Tensor: Understand Equation
- AndersF
- · Replies 2 ·
Undergrad Time Dilation in Gravitational Fields vs Acceleration on Earth
- mcgnms
- · Replies 7 ·
Undergrad Geodesics in Schwarzschild metric
- Haorong Wu
- · Replies 42 ·
Undergrad Deriving Contravariant Form of Levi-Civita Tensor
- AndersF
- · Replies 1 ·
Undergrad Showing Determinant of Metric Tensor is a Tensor Density
- AndersF
- · Replies 4 ·
Undergrad Relativity of Simultaneity Questions
- mucker
- · Replies 62 ·
Undergrad Velocity in Relativity: Theoretical Analysis of Multi-Dimensional Universes
- guptasuneet
- · Replies 18 ·
Undergrad Expressing Vectors of Dual Basis w/Metric Tensor
- AndersF
- · Replies 8 ·
Undergrad Does a Magnet Curve Spacetime More Than a Non-Magnetic Mass?
- Will Learn
- · Replies 20 ·
Undergrad Pole in the Barn Paradox: Exploring Relativity of Simultaneity
- RH111
- · Replies 16 ·
Undergrad Calculating Force & Acceleration in Electrostatic Field (B=0)
- MichPod
- · Replies 3 ·
Undergrad GPS clock synchronization in ECI frame
- cianfa72
- · Replies 34 ·
Undergrad Mass of Water Increasing with Heating
- Ebi Rogha
- · Replies 10 ·
Undergrad FTL Travel: The Matryoshka Paradox
- Sirius_Prime
- · Replies 6 ·
High School Reactionless Drive Using Light Bouncing Off Moving Mirrors
- alas666
- · Replies 2 ·
Undergrad What is the Meaning of Foliate in Physics and Spacetime?
- Haorong Wu
- · Replies 9 ·
High School Inertial Frame of Ref & Forces: Understand Special Relativity
- Lisastronomy
- · Replies 7 ·
Insights A Principle Explanation of the “Mysteries” of Modern Physics
- RUTA
- · Replies 131 ·
Undergrad Relative Speed of Light Between Objects
- Skaperen
- · Replies 3 ·
Undergrad Light Emission by Stars: Mass, Red Shift & Hubble's Law
- gptejms
- · Replies 26 ·
Undergrad Questions regarding traveling speed in time and gravity as a force
- ffp
- · Replies 95 ·
Undergrad Does Special Relativity Affect Mass?
- The_Baron
- · Replies 1 ·
Undergrad Scope of General Relativity: Assumptions & Implications
- ohwilleke
- · Replies 22 ·
Undergrad Can You Derive \(T^{\mu\nu}\) From the Given Lagrangian?
- samalkhaiat
- · Replies 6 ·
Undergrad Transpose and Inverse of Lorentz Transform Matrix
- devd
- · Replies 89 ·
Undergrad Schwarzschild Metric Singularity: Why?
- Charles_Xu
- · Replies 4 ·
High School Does GTD Really Cause Gravity? | Brian Greene/Horn/e's 2011 The Hidden Reality
- Curious Cat
- · Replies 26 ·
Undergrad Force on Scale in Rocket Scenario: Calculation & Discussion
- Sagittarius A-Star
- · Replies 33 ·