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
Graduate Light clock paradox and light speed in media
- ScienceGuy30
- · Replies 2 ·
Graduate Can we experimentally detect the weight of energy?
- The_Duck
- · Replies 14 ·
Graduate Directional independence of motion in Lorentz Transformation
- Kanesan
- · Replies 22 ·
Graduate Do fast-moving objects appear slowed by time dilation or as they really are?
- Noctisdark
- · Replies 25 ·
Graduate There is a didactic gap in the explanation of P.O.R
- roineust
- · Replies 8 ·
Graduate Understanding Rindler Coordinates for Engineers
- nigelscott
- · Replies 10 ·
Graduate Interpretation of the Michelson-Morley experiment
- Daniil
- · Replies 8 ·
Graduate Where does gravitational potential energy come from when masses are created from energy?
- CaptainSlog
- · Replies 2 ·
Graduate How are space-like intervals important?
- Cluemore
- · Replies 8 ·
Graduate Weight Loss Physics Before SR: How Was It Understood?
- pantheid
- · Replies 1 ·
Graduate Does A_a^b denote the transpose of A in tensor notation?
- Coffee_
- · Replies 12 ·
Graduate How Does Gravity Affect Pressure and Curvature in Space?
- Derektquestions
- · Replies 4 ·
Graduate Mathematical relation between dipole moment and frequency?
- anum fatima
- · Replies 3 ·
Graduate Are energy in AC circuit components analogous to relativistic mass and rest energy?
- marlowgs
- · Replies 15 ·
Graduate Twin Paradox (again(again(again )))
- blue_leaf77
- · Replies 35 ·
Graduate Why is the speed of light constant in all reference frames?
- rumborak
- · Replies 3 ·
Graduate Can You Travel Faster Than Light According to Physics?
- kairama15
- · Replies 3 ·
Graduate What is the relationship between spin connections and tetrads on a 2-sphere?
- exponent137
- · Replies 6 ·
Graduate Speed of Light Aboard a Spaceship: An Overview
- TheLil'Turkey
- · Replies 1 ·
Graduate Is there any experimental evidence against preferred frame?
- SpiderET
- · Replies 1 ·
Graduate Time dilation: speed relative to what reference frame?
- Grimble
- · Replies 71 ·
Graduate Does spacetime imply fatalism?
- RisingSun361
- · Replies 2 ·
Graduate Derivative of metric with respect to metric
- Bitometry
- · Replies 13 ·
Graduate Parallel transport to explain motion of light near black hole?
- bcrowell
- · Replies 31 ·
Graduate Lifetime of a closed universe and expansion of open universes
- unscientific
- · Replies 4 ·
Undergrad Space-Time Singularity: What, How, and Is It Possible?
- Mohan Nivas
- · Replies 6 ·
Undergrad How Do Black Holes Acquire More Mass Than Other Objects?
- Mohan Nivas
- · Replies 11 ·
Graduate Why does the electric field appear both covariant and contravariant?
- Coffee_
- · Replies 14 ·
Graduate Relativistic generalization of Larmor fomula?
- genxium
- · Replies 5 ·
Graduate Equivalence principle and time dilation
- RisingSun361
- · Replies 34 ·
Graduate Affine parameterization of a light ray
- kkz23691
- · Replies 7 ·
Graduate Time dilation in Alcubierre drive spacetime vs Schwarzschild metric
- Prierin
- · Replies 8 ·
Undergrad How can (1/2)mv^2 and p^2/2m give different results?
- sawer
- · Replies 15 ·
Graduate What is the physics behind GR's diffeomorphism invariance?
- itssilva
- · Replies 30 ·
Graduate Relativistic Kinetic Energy as a solution to a DE
- AVentura
- · Replies 23 ·
Graduate Plugging Godel Metric's Line Element into Software for Covariant Einstein Tensor
- space-time
- · Replies 1 ·
Graduate Can time equal 0 in a Singularity?
- Baddness
- · Replies 14 ·
Graduate Why don't E=γm₀c² and E=√((m₀c²)² + (pc)²) give the same result?
- PWiz
- · Replies 42 ·
Graduate Trouble wrapping my head around GR
- xcourrier
- · Replies 17 ·
Graduate Covariant Derivative - where does the minus sign come from?
- unscientific
- · Replies 9 ·
High School What is the Real Life Twin Paradox?
- nitsuj
- · Replies 10 ·
Graduate Orthonormal Basis in General Relativity - Carroll
- exponent137
- · Replies 3 ·
Graduate Can general relativity and quantum gravity both be true?
- Timothy S
- · Replies 4 ·
Graduate Finding redshift in terms of curvature density in FRW universe
- unscientific
- · Replies 1 ·
Graduate Relativistic mass in Six Not-so-easy Pieces (Feynman)
- zthompson47
- · Replies 13 ·
Graduate Finding a reference on gauge formalism of gravity
- shereen1
- · Replies 2 ·
Undergrad Are time machines possible? (serious)
- sumana
- · Replies 5 ·
Graduate Black hole collapse and Hawking radiation in distant observer frame
- JoeMath
- · Replies 12 ·
Graduate The Significance of FRW Metric for Cosmological Redshift
- binbagsss
- · Replies 1 ·
Graduate Covariant Liénard-Wiechert fields derivation in equation 18.23-18.25
- decerto
- · Replies 1 ·
Graduate What is the Relationship Between Time and Matter?
- Salvador
- · Replies 5 ·
Graduate Purcell's transverse force rule and density contraction in SR
- doaaron
- · Replies 9 ·
Graduate Spacetime: Is There Zero Separation for Charged Particles?
- Strange design
- · Replies 7 ·
Graduate Gravitational Collapse Calculations Problem Solved
- ShayanJ
- · Replies 1 ·
Graduate Length contraction test in electrical circuits
- exmarine
- · Replies 11 ·
Graduate Can you pull someone back across a black hole event horizon with a tether?
- RandyD123
- · Replies 15 ·
Graduate What is the significance of hypervolume in quantum physics?
- Helios
- · Replies 10 ·
Graduate Why can we normalize the tangent vector product to ±1 by affine reparameterization?
- binbagsss
- · Replies 4 ·
Graduate Dirac theory over gravitational constant reduction.
- aditya ver.2.0
- · Replies 2 ·
Graduate Does Entering a Black Hole Speed Up Universal Aging?
- jimmycricket
- · Replies 43 ·
Undergrad Algebra Question: Where Does the 2 Come From?
- binbagsss
- · Replies 1 ·
Graduate Schwarzschild Extension Coordinate Transformation Algebra
- binbagsss
- · Replies 8 ·
Graduate Why doesn't the gravitational force cancel at a black hole's centre?
- Matthew Goldman
- · Replies 4 ·
Graduate Are black hole horizons relative to the observer's state of motion?
- wabbit
- · Replies 133 ·
Graduate Comoving/Proper distance, transverse comoving distance
- unscientific
- · Replies 1 ·
Undergrad Time Dilation on Earth: Why Hemisphere Matters
- Philjhinson
- · Replies 59 ·
Undergrad Light Travel After Big Bang: Baseball Universe Impact
- Pjpic
- · Replies 7 ·
Graduate FRW metric derivation: why does Tod use R=3k instead of R=6k?
- binbagsss
- · Replies 4 ·
Graduate Computing trajectories in Schwarzschild spacetime
- bcrowell
- · Replies 35 ·
Graduate What makes a curvature singularity necessary and sufficient?
- binbagsss
- · Replies 5 ·
Graduate Is it possible to stop time completely?
- RisingSun361
- · Replies 6 ·
Graduate Light Speed at 0.8c: Is My Understanding Correct?
- RisingSun361
- · Replies 4 ·
Graduate Stationary/ Static Conditions Metric?
- binbagsss
- · Replies 6 ·
Graduate How does the curvature of spacetime affect space?
- RisingSun361
- · Replies 13 ·
Undergrad Does a modern graduate student understand GR better than Einstein?
- poom
- · Replies 24 ·
Graduate Why does light appear slower than c in the moving carriage thought experiment?
- Gordie19
- · Replies 3 ·
Graduate Godel Metric Cosmological Constant
- space-time
- · Replies 1 ·
Graduate Does Metric Signature Affect Torsion Definition?
- binbagsss
- · Replies 1 ·
Graduate If the local is defined as the 'Hubble radius'
- BTBlueSkies
- · Replies 5 ·
Graduate Contracting the Ricci tensor to get the Ricci scalar in index manipulation
- binbagsss
- · Replies 9 ·
Graduate Does proper time depend on location in special relativity?
- binbagsss
- · Replies 8 ·
Graduate Does the light postulate hold under Lorentz transformations between frames?
- boggledandnot
- · Replies 28 ·
Graduate Why does DV^u/Dλ transform as a (1,1) tensor, not a covector?
- binbagsss
- · Replies 3 ·
Undergrad Speed of light vs speed of sound
- doaaron
- · Replies 32 ·
Undergrad Why is matter assumed to cause gravity?
- Zwarmapapa
- · Replies 6 ·
Graduate What causes frame-dragging around rotating black holes?
- Warp
- · Replies 3 ·
Graduate Will the Earth Observers See a Burning Spaceship?
- BTBlueSkies
- · Replies 9 ·
Graduate Earman's naked singularity quote about green slime and lost socks
- bcrowell
- · Replies 1 ·
Graduate Simultaneous birth of two people in an inertial frame
- samirgaliz
- · Replies 25 ·
Graduate Vanishing of Einstein tensor from Bianchi identity
- binbagsss
- · Replies 17 ·
Graduate Clocks Within Each Ship in Bell Spaceship Paradox
- 1977ub
- · Replies 141 ·
Graduate Questions on relativistic mass and directional relativity?
- iliedonUA
- · Replies 30 ·
Graduate How do accelerating objects avoid having multiple masses in different frames?
- TheTuringTester
- · Replies 7 ·
Graduate How Does a Neutron Star Affect the Mass of an Object Falling Into It?
- Ans
- · Replies 5 ·
Graduate Deriving Schwarz Metric Weak Limit: Carroll's Lecture Notes 1997
- binbagsss
- · Replies 1 ·
Graduate Does vibrating at near light speed slow your proper time relative to surroundings?
- SpanishOmelette
- · Replies 4 ·
Graduate Can space expand faster than light without infinite rapidity?
- AlexDB9
- · Replies 8 ·
Graduate How to classify coordinate as S-L,Null,T-L?
- binbagsss
- · Replies 15 ·
Graduate Line element for the Gödel metric with all terms shown
- space-time
- · Replies 2 ·
Graduate Inequalities. Special relativity.
- LagrangeEuler
- · Replies 9 ·