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 Can you use SR with curved coordinates to find proper time in accelerated frames?
- sqljunkey
- · Replies 3 ·
High School Can the Lorentz Factor Approach 0i as v Exceeds c for FTL Reference Frames?
- Chris Miller
- · Replies 12 ·
High School How do proper time and coordinate time differ?
- TheQuestionGuy14
- · Replies 7 ·
Undergrad Do alternative gravitational field theories reduce degrees of freedom?
- gerald V
- · Replies 7 ·
Graduate Unpacking Entropy Bounds and Their Violations
- martinbn
- · Replies 4 ·
High School Relativistic Kinetic Energy: Does Mass Change?
- Weam Abou Hamdan
- · Replies 3 ·
Undergrad Is invariant mass conserved in non-isolated systems?
- liuxinhua
- · Replies 83 ·
Graduate Graviton Model: Can We Describe It Mathematically?
- alantheastronomer
- · Replies 8 ·
High School Can tachyons travel faster than light without violating relativity?
- TheQuestionGuy14
- · Replies 12 ·
High School Proper Time Change: Helium 4 Superfluid Effects
- Ripperooster
- · Replies 8 ·
Graduate Derivation of Einstein Field Equations w/o Poisson or Least Action
- EagleH
- · Replies 4 ·
Graduate How to calculate the Riemann curvature at r=2GM?
- Bishal Banjara
- · Replies 62 ·
High School Does a Black Hole with Lower Density Than Water Float or Sink?
- fluidistic
- · Replies 20 ·
High School What does the second postulate of special relativity actually mean?
- Wolfgang Stracke
- · Replies 21 ·
High School MinutePhysics Special Relativity Series
- ZapperZ
- · Replies 43 ·
High School Gamma rays below pair production threshold detect pairs when blue-shifted
- Alfredo Tifi
- · Replies 4 ·
Undergrad Traveling at Light Speed: Is a Photon Stationary?
- Joe
- · Replies 6 ·
Undergrad Simultaneity and the Twin Paradox
- Freixas
- · Replies 138 ·
Graduate Reporting my own post to bring this to the attention of a moderator.
- e-pie
- · Replies 39 ·
Graduate Potential energy and pressure in Newtonian gravity
- Jonathan Scott
- · Replies 16 ·
High School Is Lorentz contraction real or just relative to your reference frame?
- Wolfgang Stracke
- · Replies 13 ·
High School Simulation of a neutron star's impact on a supermassive black hole?
- The Bill
- · Replies 24 ·
High School What are the implications of a 24-light-hour tower at the Earth's equator?
- My_name_is_Peter
- · Replies 4 ·
Undergrad Could the Alcubierre metric explain orbital speeds of outer galactic stars?
- Jetro
- · Replies 8 ·
Undergrad EoM via varying action - covariant derivative when integrate
- binbagsss
- · Replies 12 ·
Undergrad Do light reflections from both ends of a moving ship reach you simultaneously?
- Kiley
- · Replies 39 ·
Graduate Can a black hole be presented as a knot complement or Heegaard decomposition?
- nateHI
- · Replies 12 ·
Graduate Problem with a basic theorem in Wald's GR book
- facenian
- · Replies 8 ·
High School Is There a Formula for Gm/r in Gravitational Potential?
- concernedhuman
- · Replies 2 ·
High School Ideas for Teaching Relativity to High School Kids
- Luis Babboni
- · Replies 13 ·
Undergrad Can a connection be incompatible with the metric?
- kent davidge
- · Replies 12 ·
Undergrad Can Gravitational Waves Explain Uniform Space Expansion in the Universe?
- l0st
- · Replies 16 ·
Undergrad Satellite Orbit synchronization
- name123
- · Replies 126 ·
Undergrad Is E=mc^2 Explained Correctly?
- Brian1952
- · Replies 3 ·
Undergrad Effect of Relativity on Laser Sail Acceleration
- Sebastiaan
- · Replies 15 ·
High School Is mass a form of potential energy?
- Aidyan
- · Replies 16 ·
Graduate Calculating Christoffel Symbol with Rotating Metric
- MathematicalPhysicist
- · Replies 25 ·
Undergrad What is the Term for ds in Spacetime Interval Equation?
- nomadreid
- · Replies 16 ·
Undergrad How does (n/2,n/2) representation correspond to a tensor with n indices?
- chingel
- · Replies 4 ·
High School Observational Effects of "FTL" spotlight from laser pointer?
- AndromedaRXJ
- · Replies 50 ·
Undergrad Relativistic formula for motion with constant acceleration
- bobie
- · Replies 55 ·
Undergrad What I understand about Time Dilation
- name123
- · Replies 83 ·
Graduate Given a Metric, find the constants of motion
- MathematicalPhysicist
- · Replies 12 ·
High School Does length contraction happen to the object or just look that way in 4D?
- Joao
- · Replies 10 ·
Undergrad Should the point charge's own field be included when transforming to its rest frame?
- QuasarBoy543298
- · Replies 2 ·
Undergrad Deriving Maxwell's Equations from Field Tensor (Griffith 4ed)
- omega_minus
- · Replies 6 ·
Undergrad Can Wormholes Be Created Without Exotic Particles?
- Umaxo
- · Replies 1 ·
Undergrad Reconciling two observers in two frames
- Freixas
- · Replies 56 ·
Undergrad Covariant derivative and basis vector transformation
- kent davidge
- · Replies 4 ·
Undergrad Can length contraction make a classical object quantum?
- Silviu
- · Replies 16 ·
High School Why is the speed of light a constant?
- Sjm_dynamo
- · Replies 18 ·
Graduate Why treat metric and connection as independent in gravity theories
- shahbaznihal
- · Replies 11 ·
Graduate What are the possible radii for free falling motion in a rocket trip?
- MathematicalPhysicist
- · Replies 2 ·
High School Speed of Light Slowed for SuperBig Observer?
- Romanko
- · Replies 9 ·
Undergrad Does gravity dilate time by constricting atomic motion?
- jim77
- · Replies 5 ·
Graduate Inverting a non-diagonal metric tensor for Christoffel symbols
- MathematicalPhysicist
- · Replies 12 ·
High School Does motion affect time or time affect motion?
- Fernando Freire
- · Replies 10 ·
High School How can the universe be flat if mass curves spacetime?
- robbierobb
- · Replies 9 ·
Graduate On metric and connection independence
- shahbaznihal
- · Replies 15 ·
Undergrad Can We Choose a Coordinate System for a Levi-Civita Connection on Manifolds?
- kent davidge
- · Replies 34 ·
High School How can any physical body truly be at rest?
- platosuniverse
- · Replies 24 ·
Graduate Open problems in gravity and cosmology
- shahbaznihal
- · Replies 1 ·
Undergrad Solving Tensor Calculus Question from Schutz Intro to GR
- shahbaznihal
- · Replies 7 ·
Undergrad Will a spring extend more when going at relativistic speeds?
- Idunno
- · Replies 55 ·
High School Fresnel's formula and ether drag in Resnick book
- Arup Biswas
- · Replies 1 ·
High School Can Anything Go Through a Black Hole?
- Gonzalo
- · Replies 12 ·
Undergrad Parallel transport along geodesics in local convex neighborhoods
- Pencilvester
- · Replies 2 ·
Undergrad Does infinite one-way speed of light violate p conservation?
- Sorcerer
- · Replies 28 ·
Undergrad Can 15m fiber and laser delay measure one-way speed of light?
- CompSci
- · Replies 15 ·
High School Why Albert Einstein's Original Concept for a Black Hole?
- K. Doc Holiday
- · Replies 18 ·
Undergrad Can Black Holes Transport Mass Back in Time?
- FyrenEyce
- · Replies 11 ·
Undergrad Nearly Lorentz coordinate system and the stress-energy tensor
- Silviu
- · Replies 11 ·
High School What is proper time and how do I solve it?
- Zephaniah
- · Replies 36 ·
Undergrad Tensors: Bar Symbol Over Functions or Indices?
- kent davidge
- · Replies 5 ·
High School Does the size of the Universe change with motion?
- platosuniverse
- · Replies 13 ·
Undergrad Principle of Equivalence: Are You in a Gravitational Field?
- Sandeep T S
- · Replies 7 ·
Undergrad EFE: Deriving Speed of Gravity, Gravitational Waves?
- SamRoss
- · Replies 4 ·
Undergrad Geometric difference between T_{a}^{b} and T^{a}_{b} tensors
- quickAndLucky
- · Replies 3 ·
High School Does quantum gravity explain dark matter effects without dark matter?
- joelr
- · Replies 8 ·
Undergrad Circle tangential velocity approaching c
- Osvaldo
- · Replies 27 ·
High School How do I express velocity in the time dilation formula?
- hugo_faurand
- · Replies 15 ·
High School Electric Field in Accelerating Elevator
- jartsa
- · Replies 15 ·
Undergrad Alcubierre Warp Drive: 2nd Law of Thermodynamics Impossibility?
- Randy Subers
- · Replies 3 ·
High School Did Einstein's cosmological constant predict dark energy?
- Charles Shahar
- · Replies 4 ·
Undergrad Why special relativity is unsuitable to describe gravity
- Adel Makram
- · Replies 63 ·
Undergrad Levi-Civita Contraction Meaning: Undergrad Research
- cmcraes
- · Replies 1 ·
High School Do quantum interpretations account for relativity?
- Joao
- · Replies 9 ·
Undergrad Why teach v² = 2as as correct when it's incomplete
- spino
- · Replies 3 ·
Undergrad Still have questions about photon mass
- SamRoss
- · Replies 22 ·
Undergrad Why are Maxwell's equations valid on non-inertial Earth?
- Sorcerer
- · Replies 4 ·
Undergrad Local meaning of the equivalence principle
- craigthone
- · Replies 29 ·
High School Does relativity of simultaneity mean events actually occur at different times?
- paulie2018
- · Replies 14 ·
High School Could frame dragging explain dark matter on a large scale?
- RonH
- · Replies 3 ·
Undergrad Compton Scattering w/Moving Electron: Turner's Eq 5.29
- Ken Miller
- · Replies 2 ·
Undergrad Geodesic Deviation: Definition of Connecting Vector
- Silviu
- · Replies 6 ·
Undergrad Can an object be both a black hole and not a black hole?
- friend
- · Replies 3 ·
High School Relativistic Energy: Change of Consts. of Integration
- SamRoss
- · Replies 3 ·
Undergrad Does a stationary electron in a gravitational field radiate?
- Gene Naden
- · Replies 114 ·
Undergrad Why are non-coordinate bases fundamentally different from coordinate bases?
- Silviu
- · Replies 7 ·
High School Who is older: the spaceship rider or the one left on Earth?
- Zephaniah
- · Replies 9 ·