Special and General Relativity Forum

Graduate Einstein equation when the cosmological constant varies with coordinates

Graduate Mermin's geometrical approach to SR

Graduate Confirming Einstein's Theory: Measurement of Bending of Light

Graduate Is time travel possible and does it mean we have no free will?

Graduate Can a New Type of Black Hole Exist Without a Singularity?

Graduate Curved Space-time and Relative Velocity

Graduate Could an observer prove he is in a CTC?

Graduate What Does Locally Lorentz Really Mean in Spacetime Geometry?

Undergrad Why do symmetric twins moving apart and returning have the same age?

Graduate Does the Schwarzschild metric embed gravitational curvature?

Graduate What is the 4-velocity of an object?

Graduate Most power gravitational wave sources

Graduate Mass-Beam Behaviour: An Analysis of Efficiency for Particle-Beam Pushed Sails

Undergrad Understanding Relativity: An Introduction for A-Level Students

Undergrad Can we detect motion by observing fuel consumption in a moving vehicle?

Graduate Solutions to Killing's equation in flat spacetime

Undergrad E=MC2 vs. m² = E² - p²: Motion vs Rest

Graduate Derivation of Energy-Momentum Relation WITHOUT using relativistic mass?

Undergrad Special relativity Only Valid Under Handpicked Conditions?

Graduate The Stress part of the Stress - Energy - Momentum Tensor

Graduate ED Griffiths "World Line" Problem: Solution to p.506, prob. 12.22

Graduate How Does Time and Space Switch Roles at a Black Hole's Event Horizon?

Graduate Functional derivative of connection with respect to metric

Undergrad Can Time Travel Really Alter Our Perception of Communication?

Undergrad Is the presence of 'c' in E=mc^2 coincidence?

Graduate How much matter can you put in space and time?

Graduate Does Einstein's Lorentz transformation derivation use γ instead of γ²?

Undergrad General Relativity- the Sun revolves around the Earth?

Graduate Does rest-energy include kinetic energy in relativity?

Graduate Coordinate transformation and metric tensor

Undergrad Coordinate Systems: GR vs Newtonian

Graduate How much mass would be needed to match the strength of other fundamental forces?

Graduate How Can Gravity Be Calculated in an Alderson Disk System?

Undergrad Can gravity near a black hole accelerate objects faster than light?

Graduate Where does the Einstein-Hilbert action come from?

Graduate Velocity addition expressed as gamma

Undergrad Can Energy be Converted into Mass?

Graduate Time Dilation Light Clock Example

Graduate Deriving Relativistic Momentum

Graduate What Determines the Sources of Gravity in Einstein's Theory?

Graduate How Does Dark Energy Exhibit Negative Pressure in Cosmology?

Graduate Gravitational Analog to Maxwell's Eq.

Graduate How Can We Understand Geodesics in Curved Spacetime Under Gravity?

Graduate Understanding Contortion Tensor in Teleparallel Gravity

Graduate Has Special Relativity really been proven?

Graduate Timelike geodesic equations for the Schwarzschild metric

Undergrad Does Relative Speed Affect Gravitational Attraction?

Undergrad Can you accelerate faster than the speed of light?

Graduate What Prevents the Time Dilation Paradox in Intergalactic Travel?

Graduate The strange world of Phil the photon

Graduate Device to measure curvature of spacetime.

Graduate Is it Possible to Travel Faster Than Light?

Graduate What are Christoffel symbols in general relativity?

Graduate How has relativity changed since Einstein, and what extensions are used now?

Graduate Clocks at each end of an accelerating 1 light-second spacecraft

Graduate Understanding Relativity Concepts in Interstellar Space

Graduate How Clocks (Seemingly) Ruin Everything

Graduate Quantitative Predictions from Higher Math? Relativity, Quantum Field, String

Graduate Time dimension extent of a 4-dimension object

Graduate What is the equation for stable orbits in Kerr metric?

Undergrad Curvature in space time ? Gravity

Graduate Preserving Magnetic Polarity in a Revolving Reference Frame

Graduate Acceleration vs Gravity and effect on time/clocks

Graduate If I was traveling at 51% the speed of light

Graduate Negative moving coordinates and Time Dilation

High School Gravity on a Moving Train: More or Less?

Graduate Are Relativistic Mass Calculations Still Relevant in Modern Physics?

Graduate The WHY of speed of light vs. the FACT thereof

Graduate Does gravity REALLY pull on light? Really?

Graduate Is Flat-Earth's Gravity Theory Flawed Due to Relativistic Acceleration?

Graduate Both think the other's time is slower Paradox

Graduate Understanding accelerated frame in general relativity

Graduate Do space travelers moving at >c relative to each other violate relativity?

Graduate Contradiction in Relativistic Simultaneity in Taylor-Wheeler Spacetime Physics?

Undergrad The world revolves around a person

Undergrad What is the best frame of reference?

Undergrad Does light really travel in same frame of reference

Graduate The Big Bang singularity - does it have infinite energy?

Graduate Why doesn't orbital speed reverse which object appears more massive?

Graduate Deriving equation 3 from arxiv 0709.4593

Graduate Black Hole time dilation + biological paradox

Graduate On the Electrodynamics of Moving Bodies

High School Video feed from a light-speed spacecraft and time dilation

Graduate Books and websites with general relativity problems

Graduate What Are Some Physically Relevant Higher-Order Lagrangian Systems?

Graduate Solving for g_φφ=0 in charged/rotating BHs

Graduate Why doesn't a black hole grow in size when it gains mass?

Graduate Evidence for preferred frames?

Graduate Proper distance vs comoving distance in GR

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Graduate What happens in this scenario? (Poll)

High School What does moving backward in time actually mean?

Graduate Relating the metric tensor equation to Pythagoras' theorem in 2D

Undergrad Impossibility of Backwards Time Travel

Graduate Are there any energy change of photon in different frame?

Graduate Is Faster Than Light Travel Possible Through Kinetic Energy?

Graduate Why wasn't the early universe a black hole?

Undergrad How does time dilation work for round-trip near light speed travel?