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 Superluminal and temporal effect
- Edward Wij
- · Replies 8 ·
Undergrad Does light experience time, and would traveling at light speed stop time for the traveler?
- james weaver
- · Replies 10 ·
Graduate Gauge symmetry of the Fierz-Pauli action for massive gravity
- Mentz114
- · Replies 47 ·
Graduate What is Rieman for a conformal metric?
- Kurvature
- · Replies 40 ·
Undergrad Does light reach a 0.99c observer at speed c or 0.01c?
- davedude
- · Replies 3 ·
Graduate Does a star orbiting a black hole appear to slow down near the event horizon?
- EskWIRED
- · Replies 3 ·
Graduate How Does the Element of Solid Angle Transform Under Lorentz Transformation?
- ShayanJ
- · Replies 12 ·
Graduate Realizing Warp Drive with Matter-Antimatter Fuel Cells
- 5not42!
- · Replies 2 ·
Graduate Extension of Schwarzschild Light Cones: White Hole/Black Hole
- binbagsss
- · Replies 1 ·
Undergrad Why doesn't light speed add to the train's speed like a bullet does?
- Fred Choi
- · Replies 2 ·
Graduate Time dilation in the field interpretation of GR
- Sonderval
- · Replies 67 ·
Graduate Time frames and general relativity
- alonion
- · Replies 11 ·
Graduate Why Can I See UV and IF Light While Others Can't?
- Jordaniel
- · Replies 1 ·
Graduate Is Gravitational Redshift Similar to the Doppler Effect?
- aditya ver.2.0
- · Replies 22 ·
Graduate Why do parallel light beams not attract gravitationally?
- Danyon
- · Replies 6 ·
Graduate Light speed is not constant or accurate
- Eric Ward
- · Replies 50 ·
Graduate Instantaneous Curvature in Mass Warp Spacetime?
- TimeRip496
- · Replies 8 ·
Graduate Why do photons seem to defy the effects of time?
- Muthumanimaran
- · Replies 16 ·
Graduate Why does a light clock tick differently depending on which end the photon starts from?
- latter
- · Replies 19 ·
Graduate Does kinetic energy increase the inertial mass?
- davidbenari
- · Replies 11 ·
Undergrad Why does force differ by direction at relativistic speeds?
- johann1301
- · Replies 12 ·
Graduate Understanding Spacetime in QM and QFT: Time Treatment and Particle Tracking
- lucas_
- · Replies 8 ·
Graduate Gravitational waves in cosmology?
- TEFLing
- · Replies 7 ·
Graduate Proper Frame of Observer O: Unique Foliation?
- andrewkirk
- · Replies 3 ·
Graduate Understanding Einstein Field Equations & Levi Civita Symbol/Jacobian Determinant
- TimeRip496
- · Replies 2 ·
Graduate Panda"Understand Relationship between Stress-Energy Tensor and Interval
- HeavyMetal
- · Replies 3 ·
Graduate What is conformal time in relativity, and how does it differ from a Lorentzian manifold?
- palmer eldtrich
- · Replies 5 ·
Graduate Does spacetime distortion propagate at light speed or instantaneously?
- TimeRip496
- · Replies 44 ·
Graduate Do particles tunnel less frequently where time dilation slows their dynamics?
- DDov
- · Replies 5 ·
Graduate Path of a planet orbiting a star in GR
- backward
- · Replies 8 ·
Graduate Tensor Calculus Problem: Simplifying Terms with Index Exchange
- Mentz114
- · Replies 4 ·
Graduate Frequency dependence of gravitational acceleration
- Dylan H
- · Replies 11 ·
Graduate How does the Einstein field equation account for the speed of light?
- TimeRip496
- · Replies 1 ·
Graduate Convex Neighbourhoods in Relativistic Spacetimes
- center o bass
- · Replies 6 ·
Graduate What is the Bianchi identity and how does it relate to the Riemann tensor?
- TimeRip496
- · Replies 11 ·
Graduate What is the basis for the postulate of light speed constancy?
- Lazzini
- · Replies 5 ·
Graduate Trampoline analogy for gravity
- arunshanker
- · Replies 12 ·
Graduate What happens to a person in free-fall at the center of the Earth?
- BATMANofPHYSICS
- · Replies 6 ·
Graduate Notation for the Maxwell field in AdS/CFT
- Einj
- · Replies 6 ·
Graduate Why must the relative speed between two inertial frames be the same?
- A.Abbadi
- · Replies 3 ·
Graduate Gauge Invariance of Weak Gravity Approximation
- Dixanadu
- · Replies 1 ·
Graduate Is the Schwarzschild Metric Always Applicable to Black Holes?
- TimeRip496
- · Replies 1 ·
Graduate Would a measuring tape spool appear to unravel faster than light due to time dilation?
- Xavier Cross
- · Replies 14 ·
Graduate Can cause and effect be simultaneous in relativity?
- palmer eldtrich
- · Replies 27 ·
Graduate Hypothetical FTL communication black-boxes and causality
- Silber5
- · Replies 9 ·
Graduate Can diagonal metric components depend on any coordinate variable?
- kkz23691
- · Replies 4 ·
Graduate How does GPS correct for time dilation?
- doaaron
- · Replies 69 ·
Graduate Why does k determine FLRW finiteness when R can exceed the scaling radius a?
- Mishra
- · Replies 5 ·
Graduate Metric matrix for binary star system?
- exmarine
- · Replies 1 ·
Graduate Einstein's Field Equations: Effective Potential Functions
- novice_hack
- · Replies 3 ·
Graduate Index-Free Decomposition of Derivative Timelike Congruence
- center o bass
- · Replies 5 ·
Graduate What is Spherically Symmetric Radiation-Filled Universe?
- Mentz114
- · Replies 1 ·
Graduate How Did Clifford's Theories Influence Modern Physics and String Theory?
- BiGyElLoWhAt
- · Replies 5 ·
Graduate Does gravity indeed travel in waves?
- Gaz1982
- · Replies 21 ·
Graduate Active and passive diffeomorphisms in Rovelli's Quantum Gravity
- albedo
- · Replies 28 ·
Graduate How much does a point mass curve spacetime at distance r?
- xortdsc
- · Replies 2 ·
Graduate Is mass movement influenced by the curvature of spacetime?
- TimeRip496
- · Replies 3 ·
Graduate Schwarzschild Radius Derivation: Is it Possible Classically?
- TimeRip496
- · Replies 1 ·
Undergrad Lorentz transformation calculation check
- name123
- · Replies 110 ·
Graduate How do closed timelike curves avoid mass discontinuities in spacetime?
- georgir
- · Replies 3 ·
Graduate Speed of light postulate and clock synchronization
- Fantasist
- · Replies 15 ·
Graduate I just want your guys opinion on my idea against E=mc
- siebe22
- · Replies 1 ·
Graduate Could the universe exist without space and time?
- Quds Akbar
- · Replies 4 ·
Graduate Does a moving train's clock appear to run faster to a stationary observer?
- 1977ub
- · Replies 11 ·
High School What does physics say time really is?
- GusAmancio
- · Replies 2 ·
Graduate Does a falling object appear to accelerate to a distant observer?
- LM542
- · Replies 3 ·
Graduate Overcoming roadblocks to measuring one-way speed of light
- Kanesan
- · Replies 2 ·
Undergrad Relative Time: Earth vs Mars - A Physics Enthusiast's Question
- Wh17e
- · Replies 7 ·
Graduate How Do Spinors Fit in With Differential Geometry
- stevendaryl
- · Replies 33 ·
Graduate Can we combine special relativity with Newtonian gravity?
- TimeRip496
- · Replies 7 ·
Graduate Dark Energy: Negative Pressure or Density?
- binbagsss
- · Replies 2 ·
Graduate Can you define the derivative of a vector field without parallel transport?
- stevendaryl
- · Replies 18 ·
Undergrad What are the energy implications of time travel into the future?
- Suraj M
- · Replies 37 ·
Graduate Can Each Particle Experience Time as Its Own Observer?
- lnsanity
- · Replies 4 ·
Undergrad Time Dilation Confusions - A Physics Newbie's Questions
- Rene Manzano
- · Replies 9 ·
Graduate What is a Frame of Reference in Physics?
- leo.
- · Replies 4 ·
Graduate Measuring one-way speed of light with unsynchronized clocks
- Kanesan
- · Replies 4 ·
Graduate Gravitational equations used in model of orbiting bodies
- nearc
- · Replies 8 ·
Graduate Lowering Indices: Tensor Calculus Basics
- unscientific
- · Replies 8 ·
Graduate How does quantum field theory explain mass warping spacetime?
- TimeRip496
- · Replies 2 ·
Graduate Time Dilation Effects on Observer Perception
- julianwitkowski
- · Replies 4 ·
Graduate Black Hole Event Horizon: Is There a Physical Boundary?
- ChrisVer
- · Replies 5 ·
Graduate Tensor contraction rules for raising and lowering indices
- unscientific
- · Replies 10 ·
Graduate Einstein vs Newton: Does GR Disprove Gravitation?
- Bernard
- · Replies 3 ·
Graduate Black Hole Singularity: Infinite Mass & Merging Supermassive Black Holes
- James S
- · Replies 5 ·
High School Will This Method Yield Absolute Synch?
- tonto
- · Replies 9 ·
Graduate Geodesic Deviation Equation Solved
- unscientific
- · Replies 7 ·
Graduate Do gravitons warp spacetime or is spacetime itself a quantum field?
- TimeRip496
- · Replies 4 ·
Graduate Does the FRW parameter k describe space or spacetime curvature?
- binbagsss
- · Replies 6 ·
Undergrad Why is it e=mc² and not e=mc³?
- paulo84
- · Replies 21 ·
Graduate Gravitation on an Expanded Earth
- Lazzini
- · Replies 7 ·
Graduate Energy-momentum tensor radiation-dominated universe.
- binbagsss
- · Replies 4 ·
Graduate Both frames of reference predict the other is slower -- proof
- Unified28
- · Replies 11 ·
Graduate Questions about Time/Speed/Light
- arsenal1607
- · Replies 5 ·
Graduate Does universe expansion uncurve spacetime from the Big Bang singularity?
- evelknee
- · Replies 3 ·
Graduate Elliptical Orbits In The Schwarzschild Metric
- dman12
- · Replies 4 ·
Graduate Problem Book in Relativity and Gravitation, online, free
- Spinnor
- · Replies 2 ·
Graduate Expanding Lorentz matrix product with Minkowski metric
- Dixanadu
- · Replies 13 ·
Graduate Do gravitational time dilation effects cancel out or add up?
- smoothoperator
- · Replies 5 ·
Graduate Rotating Disk and Time Dilation
- ionm
- · Replies 15 ·