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
High School Who is older: the spaceship rider or the one left on Earth?
- Zephaniah
- · Replies 9 ·
Undergrad Understanding Time Dilation and Differential Aging in the Twin Paradox
- t_ras
- · Replies 12 ·
Undergrad Can a Magnetic Field Create Gravity?
- essenmein
- · Replies 6 ·
Insights The Speed of Light and of Galilean Relativity - Comments
- klotza
- · Replies 37 ·
Graduate Proper acceleration from 3-vectors and 4-vectors in special relativity
- pervect
- · Replies 11 ·
High School Maxwell's EM Theory vs Principle of Relativity
- HAF
- · Replies 6 ·
Undergrad Is the equivalence principle considered true or false?
- facenian
- · Replies 12 ·
Undergrad How can spacetime and quantum uncertainty be reconciled?
- bahamagreen
- · Replies 22 ·
Undergrad Commutator of two vector fields
- Pencilvester
- · Replies 8 ·
Undergrad Calculating different time frames
- Dhruv007
- · Replies 33 ·
Undergrad Do non-feeding black holes continuously drain spacetime around them?
- Islam Hassan
- · Replies 18 ·
Undergrad Differential equation from derivative of time dilation
- bb1414
- · Replies 3 ·
High School Measuring the speed of light from moving source of light
- Rozman
- · Replies 5 ·
High School Speed of light circling around a black hole
- Rozman
- · Replies 9 ·
Undergrad Any database of results for the Michelson-Morley Experiment
- maajdl
- · Replies 1 ·
Undergrad What is the fastest time can go?
- James Minwell
- · Replies 21 ·
Undergrad Gravitational time dilation - acceleration vs potential
- Prometeus
- · Replies 9 ·
Undergrad Why doesn't gravity blue shift like light and sound do?
- .Scott
- · Replies 38 ·
Undergrad Is Time Travel Really Possible: Can We Move Backward in Time?
- LYCON
- · Replies 1 ·
Undergrad Einstein Proved Right 500M Light Years Away
- Tom.G
- · Replies 2 ·
Undergrad Deriving Einstein Equations: Questions on Linearity & Symmetry
- Decimal
- · Replies 2 ·
Undergrad Force Experienced on a Curved Geodesic Path
- rajeshmarndi
- · Replies 5 ·
Undergrad Can you derive relativity without manifolds and vectors?
- kent davidge
- · Replies 11 ·
Undergrad Why do four-vectors have the same magnitude in different reference frames?
- Mathematicsresear
- · Replies 7 ·
Undergrad Real life example of the energy contained at E=γmc^2
- Foruer
- · Replies 64 ·
Undergrad How does the stress-energy tensor act on gravity?
- timmdeeg
- · Replies 26 ·
Undergrad Does this Special Relativity explanation with cards hold up physically?
- Philip Dhingra
- · Replies 19 ·
High School Do photons interact with spacetime?
- platosuniverse
- · Replies 3 ·
High School What is the fabric of spacetime?
- DLeuPel
- · Replies 4 ·
High School Why does time stretch events and have its current flow?
- DLeuPel
- · Replies 5 ·
Undergrad Does gravitational time dilation trade off time velocity for spatial velocity?
- sawer
- · Replies 2 ·
Undergrad Why do dual vectors extract components the same way as dot products?
- LagrangeEuler
- · Replies 13 ·
High School How do we know which particle is moving in a circular loop near lightspeed?
- yerty4235437y
- · Replies 28 ·
Undergrad Time Dilation: Does Gravitational Field Strength Matter?
- sawer
- · Replies 6 ·
High School Derivative of the Lorentz factor
- SiennaTheGr8
- · Replies 1 ·
High School Limitless Momentum of Black Holes
- Sveinbjoern
- · Replies 11 ·
Undergrad Why is the time transformation needed for the second event in Lorentz derivation?
- Kaguro
- · Replies 3 ·
Undergrad Restrictions of 1st Order Perturbation Theory
- JuanC97
- · Replies 6 ·
Undergrad Books explaining the Michelson-Morley experiment and light's invariant speed
- AhmedHesham
- · Replies 5 ·
Undergrad Kruskal–Szekeres coordinates for Kerr metric
- Dale
- · Replies 3 ·
Graduate Pressure and Newtonian potential energy
- Jonathan Scott
- · Replies 37 ·
High School Einstein's Cosmological Constant: Push or Pull?
- Cycklops
- · Replies 2 ·
Undergrad Relativity of Time for Two Observers
- Rozman
- · Replies 30 ·
Undergrad Momentum transfer in diffuse reflection
- pervect
- · Replies 9 ·
High School What the movie Interstellar got right and wrong?
- RandyD123
- · Replies 7 ·
Undergrad Metric for Single Photon: What's Best?
- Anwyl
- · Replies 5 ·
Undergrad Energy Radiated by Object Falling in Black Hole
- Riyan
- · Replies 23 ·
Undergrad Can someone fact check my speech about BH?
- avischiffman
- · Replies 19 ·
High School Are Geometries that contain Closed Timelike Curves Possible?
- TheQuestionGuy14
- · Replies 28 ·
High School Thought Experiment from my daughter regarding black holes
- Mark Scalabrin
- · Replies 4 ·
High School Can causal loops exist with time travel?
- TheQuestionGuy14
- · Replies 24 ·
High School Real-Life Demonstrations of Black Holes for Video
- avischiffman
- · Replies 4 ·
Undergrad Does gravity impact the speed of light?
- Erribert
- · Replies 27 ·
High School What would an observer measure to demonstrate a CTC?
- Paul Colby
- · Replies 7 ·
Graduate Kottler-Moller coordinates, metric "covers" a region
- Gene Naden
- · Replies 2 ·
Undergrad Can someone explain this phenomena?
- arda
- · Replies 4 ·
Undergrad SR Time Dilation in Rigid Structure Clocks
- Malvia
- · Replies 51 ·
Undergrad Why does one particle from a matter-antimatter pair preferentially fall into a black hole?
- Pouya Pourkarim
- · Replies 12 ·
Undergrad Consequences of light moving in a medium
- Kiley
- · Replies 6 ·
High School How does frame dragging create closed timelike curves?
- TheDoctor6000
- · Replies 4 ·
Graduate How are curvature and field strength exactly the same?
- victorvmotti
- · Replies 3 ·
High School Why doesn't relativistic velocity addition exceed light speed?
- Peter Mole
- · Replies 59 ·
Undergrad Confusion regarding acceleration in SR
- Kontilera
- · Replies 62 ·
High School Gravitational Redshift: Will Two Lasers Operate Differently?
- Torog
- · Replies 7 ·
Undergrad Killing vectors in isotropic space-times
- "Don't panic!"
- · Replies 12 ·
Undergrad Why is (cdt)² − dx² invariant in SR but (cdt)² + dx² is not?
- Higgsono
- · Replies 15 ·
Undergrad How Does General Relativity Explain Gravity's Conundrum?
- Mohammad Hunter
- · Replies 5 ·
Undergrad Why is energy, not momentum, the time component of the four-vector?
- Phys12
- · Replies 11 ·
Undergrad Solving for the Missing Factor: Jumping into a Non-Rotating Black Hole
- cozycoz
- · Replies 3 ·
Undergrad How does gravitational time dilation work?
- unknown_9
- · Replies 21 ·
High School Effects of a moving mirror on a ray of light
- yrjosmiel
- · Replies 33 ·
Undergrad Can Light Transfer Momentum to Create Sound in Air?
- Sorcerer
- · Replies 10 ·
Insights Lessons From the Bizzaro Universe - Comments
- Chestermiller
- · Replies 23 ·
Undergrad Can the Christoffel connection be observed?
- Demystifier
- · Replies 52 ·
Undergrad What time structure supports info moving backward in time?
- NTHstars
- · Replies 6 ·
Undergrad What Is Frame Dragging and How Does It Affect Space?
- e2m2a
- · Replies 1 ·
High School How to find the dual basis vector for the following
- LSMOG
- · Replies 10 ·
Graduate How was the matrix in the attachment found
- LSMOG
- · Replies 6 ·
Undergrad Gravitational DE(?) from Schwartzschild spacetime
- cozycoz
- · Replies 2 ·
Undergrad Index placement on 4-potential
- dyn
- · Replies 5 ·
Graduate Why is vector made different here
- LSMOG
- · Replies 2 ·
Undergrad Is there a unit system with ##\hbar=G=c=\mu_0=1##?
- JuanC97
- · Replies 26 ·
Undergrad Relativity and speed of light basics
- starstruck_
- · Replies 59 ·
Graduate Radiation and non-radiation terms in equation B for a moving charged particle
- f16842000
- · Replies 1 ·
High School How Can We Detect Gravitational Waves from Black Holes?
- negative
- · Replies 3 ·
Graduate Hamiltonian Integral Transformation: Insight Needed
- Reverend Shabazz
- · Replies 8 ·
Graduate Gravity Field Theory in Flat Space Time: Best References
- andresB
- · Replies 4 ·
Graduate Why gravitational time dilation and light speed formulas differ
- sha1000
- · Replies 10 ·
Undergrad Coordinate and proper time, null geodesic
- binbagsss
- · Replies 42 ·
High School Transformation of velocity exceeding light speed
- sweet springs
- · Replies 5 ·
High School Can virtual particles in the vacuum act as a medium for light propagation?
- Malek
- · Replies 6 ·
Undergrad Applications of the Lie derivative in general and special relativity
- kent davidge
- · Replies 2 ·
Graduate Why doesn't an electron sitting on the Earth radiate?
- craigthone
- · Replies 44 ·
High School Why Are Numerical Examples Rare in Relativity and Quantum Mechanics?
- kent davidge
- · Replies 5 ·
High School What is the Definition of Improper Time in Special Relativity?
- FranzDiCoccio
- · Replies 8 ·
High School Is Absolute Movement Linked to Absolute Time in 3D Space?
- Ross Arden
- · Replies 13 ·
Undergrad Fizeau's Exp: TRANSFORMING VELOCITIES to Explain
- Felipe Prado
- · Replies 6 ·
Undergrad Calculating Killing vectors of Schwarzschild metric
- MathematicalPhysicist
- · Replies 2 ·
Undergrad How to derive relativistic velocity from position using differentials
- Daniel5423
- · Replies 5 ·
Undergrad Does a blueshift change the energy of a photon?
- Nicholas Harris
- · Replies 22 ·