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 Why is there a limit to the speed of light in special relativity?
- MarSuper
- · Replies 29 ·
Undergrad Theoretical problem with an empty seat going faster than light
- conquest
- · Replies 21 ·
Undergrad Geodesics on S2 Surface: Arc-Length Parametrisation
- Frank Castle
- · Replies 1 ·
High School Spacetime: Understanding Warps, Limits & Potential Energy
- IvicaPhysics
- · Replies 1 ·
Graduate Does Non-Uniform Gravity Transform E into B Fields?
- Twigg
- · Replies 9 ·
Undergrad Length contraction vs expansion
- freshman2013
- · Replies 9 ·
Undergrad On the invariant speed of light being the upper speed limit
- Joker93
- · Replies 39 ·
High School Can Magnetic Fields Control Gravity?
- wolram
- · Replies 8 ·
Graduate Inertia & Accelerated Expansion: How Does Machian Explanations Fit In?
- e2m2a
- · Replies 5 ·
Undergrad Geodesics and affine parameterisation
- Frank Castle
- · Replies 16 ·
Undergrad Gravitational Wave: Energy & Amplitude Changes
- Meerio
- · Replies 7 ·
Undergrad Differential Forms in GR: Higher Order Derivatives
- kent davidge
- · Replies 5 ·
Graduate Color of Deep Space: Distribution of Light Wavelengths
- Barnak
- · Replies 2 ·
Undergrad Why is proper time undefined for spacelike/lightlike paths?
- Frank Castle
- · Replies 17 ·
High School Measuring c from Earth: Is the Speed of Light Affected?
- jahrudz
- · Replies 5 ·
Undergrad Why don't general relativity and quantum physics agree?
- victorhugo
- · Replies 16 ·
Undergrad Relativistic Effect on Attraction between Moving Masses?
- ObjectivelyRational
- · Replies 4 ·
High School Why Contraction in Relativity Theory?
- gamb
- · Replies 18 ·
Undergrad Can Time Be Frozen and Plotted in 3D Space?
- calinvass
- · Replies 6 ·
Undergrad Wave Equation & Wave Displacement Invariance: Modern Physics
- greswd
- · Replies 16 ·
Undergrad Applicability of E and B field Transformations
- tade
- · Replies 28 ·
Undergrad What does Pt mean in this formula?
- Meerio
- · Replies 1 ·
Graduate Generalisation of Maxwell's equations
- spaghetti3451
- · Replies 1 ·
Undergrad Discrepancy in Co-Moving Charges Magnetic Force?
- greswd
- · Replies 45 ·
High School FTL Spin 1 Gauge Boson: Impact of Dark Matter Discovery
- Ontophobe
- · Replies 1 ·
Undergrad SR Doppler Effect: Differences in Wave VS Momentum Models
- tade
- · Replies 36 ·
Undergrad By what formula is this graph predicted? Cumulative Periastron Time Shift
- Meerio
- · Replies 2 ·
Undergrad Proper Distance Between Surfaces of Constant R in Curved Spacetime
- timmdeeg
- · Replies 8 ·
High School Flashlights and Guns inside an Event Horizon
- Glurth
- · Replies 24 ·
Undergrad Understand Michelson-Morley Experiment from Feynman Lectures
- Bishamonten
- · Replies 4 ·
High School Question concerning mass effect
- Asad Raza
- · Replies 1 ·
High School How Thin Can Speed Make Things? 2D Possibilities
- hsdrop
- · Replies 3 ·
High School What Happens Inside the Event Horizon of a Black Hole?
- Stephanus
- · Replies 3 ·
Undergrad Relativistic Explanation for the Unipolar Generator
- Jdo300
- · Replies 18 ·
High School Relativistic Simulation of Charged Particles: How a Physicist Would Go About It
- Jeronimus
- · Replies 4 ·
Undergrad Is Symmetry on μ and α Valid for the Derivative of the Metric Tensor?
- kent davidge
- · Replies 5 ·
High School Does time dilation work this way?
- Prem1998
- · Replies 26 ·
Undergrad Definition and measurement of proper length
- Frank Castle
- · Replies 23 ·
Undergrad Relativistic rocket - where is the relativistic mass?
- spica
- · Replies 11 ·
Undergrad Stress Energy Tensor for Oscillator: Setup for Electron in E-Field
- Devin
- · Replies 4 ·
High School Examining Time Dilation and the Effects of Velocity on Perception of Time
- Faiq
- · Replies 74 ·
Undergrad Why y=y' in the Lorentz transformation?
- Johnls
- · Replies 27 ·
High School Simultaneity: Shroedinger's Cat and Exploding Balloons
- michall
- · Replies 5 ·
Undergrad Kinetic Energy & Speed in Inertial Frames: Chris, Bob & Angelica
- Wout Veltman
- · Replies 5 ·
Undergrad Frequency of GW Arm Length Change: Properties & Detailed Explanation
- Meerio
- · Replies 5 ·
Undergrad Help with Derivation of Linearized Einstein Field Eqns
- epovo
- · Replies 5 ·
Graduate Help with Weinberg p. 72 -- time dt for a photon to travel a distance d⃗x
- Kostik
- · Replies 36 ·
High School Is the time dilation in GR equal to that in SR?
- Wasist
- · Replies 15 ·
Undergrad Special relativity timebomb on distant planet 'paradox'?
- Matternot
- · Replies 43 ·
Undergrad Differential Forms: Definition & Antisymmetric Tensor
- kent davidge
- · Replies 15 ·
Undergrad How can gravitational waves be detected if spacetime itself warps?
- greypilgrim
- · Replies 14 ·
Undergrad Superluminal Messaging and Causality Paradox: Myth or Reality?
- AdrianMay
- · Replies 11 ·
Undergrad What is the Simpler Name for Conserved Property of Spacetime?
- KetilT
- · Replies 3 ·
High School Gravity and electromagnetic radiation
- Justintruth
- · Replies 3 ·
Undergrad Trying to understand covariant tensor
- member 606890
- · Replies 5 ·
Undergrad Who is Moving Faster: Planet or Probe?
- calinvass
- · Replies 38 ·
Undergrad Formation of Bound Systems, Stars & Galaxies in General Relativity
- Frank Castle
- · Replies 10 ·
Graduate Physical Relevance of Singularity Theorems?
- strangerep
- · Replies 4 ·
High School Can Black Holes Really Allow Time Travel and Survival Beyond the Event Horizon?
- Ali Abbas
- · Replies 2 ·
Undergrad Solving SR Invariance: Minkowski Metric, Poincare Transformation, Index Notation
- binbagsss
- · Replies 9 ·
High School FTL Gravity Waves: Is Faster-Than-Light Travel Possible?
- Ontophobe
- · Replies 3 ·
High School Dropping a Black Hole from Tower of Piza
- Ontophobe
- · Replies 3 ·
Undergrad Does the energy in cc also gravitate?
- kodama
- · Replies 12 ·
Graduate The information about the curvature on the rest
- Abel Cavaşi
- · Replies 23 ·
High School In what direction do gravitational waves get emitted?
- Meerio
- · Replies 3 ·
Undergrad Deriving Schwartzschild Finding Mistake in Ricci Tensor
- abccdef125
- · Replies 5 ·
Undergrad Can a Tensor be Represented by a 3-Dimensional Matrix?
- kent davidge
- · Replies 13 ·
Undergrad Where do the missing minutes in a live feed from a spaceship to Mars go?
- John_melb
- · Replies 10 ·
High School Does Acceleration Affect Planck Lengths in General Relativity?
- BenAS
- · Replies 3 ·
High School Gravity and Inertia: Similar but not Equivalent
- Ontophobe
- · Replies 8 ·
Graduate Did Einstein Disbelieve in General Relativity Geometry?
- poom
- · Replies 1 ·
Graduate Capture by Gravitational Radiation in 2-Body System?
- Yazzledore
- · Replies 6 ·
Undergrad Index algebra questions / order of indices
- binbagsss
- · Replies 22 ·
High School Age of Universe: How Gravity Affects Time
- pforeman
- · Replies 7 ·
Graduate Distance of two shells in Gullstrand-Painleve coordinates
- Sonderval
- · Replies 6 ·
Graduate Hubble parameter vs Scale factor's derivative
- Elnur Hajiyev
- · Replies 18 ·
High School Can Time Travel Take Us Back to the Big Bang?
- Aashish sarode
- · Replies 5 ·
High School Unanswered Questions About a Lone Object's Stationary State
- Mohd Abdullah
- · Replies 25 ·
High School Why Can the Gamma Factor Exceed 2 in Relativity?
- NoahsArk
- · Replies 4 ·
Undergrad Does the Michelson-Morley Experiment Solely Confirm Constant Light Speed?
- LSMOG
- · Replies 7 ·
High School How does the universe expand with the law of thermodynamic
- Ekue Kpodar
- · Replies 8 ·
High School Is Anti-Gravity a Reality or Just a Concept?
- Stephanus
- · Replies 2 ·
Undergrad Questions about binding energy
- SiennaTheGr8
- · Replies 11 ·
High School Can Newton's G and the "Einstein Scalar" Be Related?
- kent davidge
- · Replies 3 ·
High School How Does the Michelson-Morley Experiment Detect Differences in Light Speed?
- LSMOG
- · Replies 7 ·
Graduate Relativistic generalization of Newton’s equation
- Zak
- · Replies 5 ·
Undergrad Does Special Relativity Apply to a Moving Clock?
- Kunhee
- · Replies 6 ·
Undergrad How does parallel transportation relates to Rieman Manifold?
- TimeRip496
- · Replies 9 ·
Undergrad Dimensionless Time: Rindler & Minkowski Spacetime
- felici95
- · Replies 1 ·
Undergrad Faster Than Light Travel: Wormhole Questions
- Bob Porter
- · Replies 3 ·
Undergrad Time travel thought experiment
- Shayne T
- · Replies 12 ·
High School Travel Faster than Light? Opposite Direction Objects
- mav_sd_
- · Replies 1 ·
High School Was H.G. Wells' Concept of Time as a Fourth Dimension Accurate?
- Shawn Robinson
- · Replies 7 ·
Graduate Analogy of counterterms of gauge in GR
- bluecap
- · Replies 17 ·
Undergrad Is Photon Mass Zero or Relativistic in Nature?
- Garlic
- · Replies 27 ·
Undergrad How would the sky look if ether drag hypothesis was true?
- weezy
- · Replies 5 ·
Undergrad Traveling the Universe at the Speed of Light: Is it Possible?
- Shayne T
- · Replies 12 ·
Graduate How Do Conservation Laws Apply to a 4 Current in General Relativity?
- fengqiu
- · Replies 2 ·
High School Relative Time Effect on Orbital Comm: Satellite Freq & Audio/Video
- InquiringMind
- · Replies 10 ·
Graduate Is There a Mathematical Definition of Time?
- Arjun Wasan
- · Replies 14 ·