<we><edit> <!-- questions and answers -->
lagrangian-formalism
electric-current
quantum-field-theory
special-relativity
speed-of-light
energy-conservation
soft-question
collision
fluid-dynamics
kinematics
general-relativity
optics
spacetime
symmetry
relativity
reference-frames
electrons
solid-state-physics
capacitance
experimental-physics
particle-physics
homework-and-exercises
cosmology
energy
space-expansion
general-relativity
Stationary v/s Static
homework-and-exercises
general-relativity
metric-tensor
coordinate-systems
How will two equal discs, rotating with equal but opposite angular velocities and put on top of each other affect the spacetime "surrounding" them?
general-relativity
curvature
rotation
How are frames of reference releated to each other in general realitivity?
general-relativity
differential-geometry
reference-frames
coordinate-systems
The Time Freezing Room - Theoretically possible?
general-relativity
special-relativity
spacetime
time-dilation
time-travel
Deriving the Poisson bracket relation of the Ashtekar variables
homework-and-exercises
general-relativity
hamiltonian-formalism
poisson-brackets
Electromagnetism and equivalence principle?
electromagnetism
general-relativity
equivalence-principle
How to get the 2d Einstein tensor in a spherically symmetric spacetime by varying the reduced Einstein-Hilbert action?
homework-and-exercises
general-relativity
black-holes
metric-tensor
Transformation matrices for basis and coordinate transformation in non-orthonormal coordinates
general-relativity
differential-geometry
coordinate-systems
Is Hawking Radiation compatible with a GR solution with an Infalling Observer Crossing the Event Horizon?
general-relativity
black-holes
observers
event-horizon
hawking-radiation
How can I show E=mc^2 by tensors?
general-relativity
Why the unit vector is represented as a partial derivative in GR?
general-relativity
differential-geometry
vectors
differentiation
vector-fields
What if gravitational mass and inertial mass of a body had different values?
general-relativity
newtonian-gravity
mass
With the advent of General Relativity, do Newtonian Mechanics really describe the universe correctly?
newtonian-mechanics
general-relativity
classical-mechanics
forces
gravity
Why there is no dipole gravitational wave?
general-relativity
quantum-spin
gravitational-waves
dipole
multipole-expansion
Energy momentum tensor of a perfect fluid with vanishing density?
general-relativity
fluid-dynamics
stress-energy-momentum-tensor
Owen Biesel's paper on 'The Precession of Mercury’s Perihelion'
general-relativity
integration
precession
Why does gravity travel at the speed of light?
general-relativity
speed-of-light
gravitational-waves
causality
Boltzmann's equation and Liouville's theorem in curved spacetime
general-relativity
statistical-mechanics
kinetic-theory
Does special relativity apply to gravity wells?
general-relativity
gravity
gravitational-waves
Does an object creates gravitational waves when only accelerating in one direction?
general-relativity
gravity
spacetime
acceleration
gravitational-waves
Hawking Radiation of normal gravitational field
general-relativity
quantum-gravity
hawking-radiation
unruh-effect
Misused physics analogies
general-relativity
soft-question
big-list
What is the physical interpretation of harmonic coordinates?
general-relativity
differential-geometry
gauge-theory
coordinate-systems
Gregory-Laflamme Instability of Black Strings and $p$-Branes
general-relativity
string-theory
differential-geometry
Killing tensor in Minkowski space
general-relativity
differential-geometry
tensor-calculus
Can a light be bent by a magnetic field?
electromagnetism
general-relativity
quantum-electrodynamics
Curvature and length contraction paradox
general-relativity
special-relativity
metric-tensor
coordinate-systems
curvature
Maximizing the time near a black hole
homework-and-exercises
general-relativity
black-holes
reference-frames
observers
What's the key point to argue that pure gravity can't be renormalizable from two-loop?
quantum-field-theory
general-relativity
renormalization
quantum-gravity
qft-in-curved-spacetime
Could gravitational waves be matter waves?
general-relativity
gravity
gravitational-waves
Poincaré group and BMS symmetry
general-relativity
gravity
spacetime
symmetry
poincare-symmetry
Dimensional reduction from even to odd dimensions and Chern-Simons terms
general-relativity
black-holes
supergravity
chern-simons-theory
kaluza-klein
String to the Sun
general-relativity
time
space
Can we get a real ball of matter out of an empty box?
quantum-mechanics
general-relativity
cosmology
spacetime
Pound-Rebka-Snider experiment in the inertial frame
general-relativity
doppler-effect
gravitational-redshift
Rotational relativity? Is there an universal frame of reference for rotation?
general-relativity
cosmology
reference-frames
universe
machs-principle
What are BMS supertranslation symmetries?
general-relativity
black-holes
spacetime
symmetry
quantum-gravity
Pulling apart a Black Hole
general-relativity
black-holes
spacetime
General Relativity in the absence of observers
general-relativity
gravity
reference-frames
observers
Post-Newtonian approximation for binary gravitating system
general-relativity
approximations
linearized-theory
binary-stars
For making gravity supersymmetric is a modification of Einstein's vacuum field equations necessary ( apart from adding the R-S Lagrangian)?
general-relativity
supersymmetry
compactification
supergravity
Electromagnetism in curved spacetime
electromagnetism
general-relativity
metric-tensor
tensor-calculus
When does a covariantly conserved tensor yield conserved quantities?
general-relativity
differential-geometry
conservation-laws
Inferring properties of spacetime manifolds from those of chart maps
general-relativity
spacetime
differential-geometry
topology
How to go from a wave to a particle description of photon dynamics in curved spacetime?
electromagnetism
general-relativity
photons
hamiltonian-formalism
qft-in-curved-spacetime
Could there be equivalence between anisotropic space and the presence of a field?
electromagnetism
general-relativity
spacetime
curvature
magnetic-monopoles
Why is General Relativity considered a gauge theory?
general-relativity
gauge-theory
Assuming a fixed total mass, will the spacetime geometry outside a spherical mass distribution depend on the shape (of the distribution)?
general-relativity
spacetime
symmetry
metric-tensor
curvature
Scalar curvature of warped-product manifolds - intuition
general-relativity
differential-geometry
curvature
Flat space in 3 dimension space time in vacuum
homework-and-exercises
general-relativity
vacuum
Necessity of the Gibbons-Hawking-York (GHY) boundary term
general-relativity
lagrangian-formalism
variational-principle
boundary-conditions
boundary-terms
Abstract definition of conjugate points
general-relativity
spacetime
differential-geometry
topology
geodesics
Can an Object Look as Dense as a Black Hole in Special Relativity?
general-relativity
special-relativity
Falling into a black hole – how can my perspective change from outside-observer to inside-observer?
general-relativity
black-holes
reference-frames
observers
event-horizon
Modern treatment of effective QFT in curved spacetime
quantum-field-theory
general-relativity
resource-recommendations
quantum-gravity
qft-in-curved-spacetime
Is the dynamics of spacetime observer-dependent?
general-relativity
observers
de-sitter-spacetime
Does a moving object curve space-time as its velocity increases?
general-relativity
spacetime
velocity
curvature
Does mass compress space-time?
general-relativity
gravity
spacetime
mass
curvature
Uniform Gravitational Field = No Gravitational Field?
general-relativity
gravity
spacetime
reference-frames
equivalence-principle
Do we apply force to an object we are touching?
general-relativity
gravity
mass
Physical motivation for mathematically extending solutions to Einstein's equations
general-relativity
kerr-metric
reissner-nordstrom-metric
Parallel transport as a mapping between vector spaces
general-relativity
differential-geometry
tensor-calculus
Time is defined operationally to be that which is measured by clocks
quantum-mechanics
general-relativity
spacetime
time
Sign of Lagrangian and stress-energy tensor for relativistic dust
general-relativity
lagrangian-formalism
metric-tensor
conventions
stress-energy-momentum-tensor
Bondi news in BMS supertranslation
general-relativity
black-holes
gravitational-waves
Conservation of Komar Mass
general-relativity
black-holes
mass
conservation-laws
Loss in energy during gravitational redshift
general-relativity
gravity
visible-light
Silly question about Schwarzschild Solution
general-relativity
curvature
vacuum
If an astronaut orbits earth, can both Time Dilation and Gravitational Time Dilation affect it?
general-relativity
gravity
experimental-physics
time
time-dilation
Does the covariant derivative still give divergence in skew coordinates?
general-relativity
coordinate-systems
vector-fields
covariance
Maxwell tensor in spherical and static spacetime
homework-and-exercises
electromagnetism
general-relativity
coordinate-systems
What are the measurable quantities in General Relativity?
general-relativity
gauge-theory
tensor-calculus
coordinate-systems
observables
What is the relationship between an event happening and "seeing" an event happen?
general-relativity
special-relativity
black-holes
event-horizon
Can Einstein field equations possibly accommodate Hawking radiation?
general-relativity
black-holes
metric-tensor
hawking-radiation
black-hole-thermodynamics
What is so natural and inevitable about the expansion of the universe?
general-relativity
cosmology
universe
space-expansion
big-bang
Why is the photon-sphere around a Kerr Black Hole spherical and not ellipsoid?
general-relativity
black-holes
kerr-metric
Covariant derivative of a function confusion
general-relativity
Repulsive gravity formulation: a query
homework-and-exercises
general-relativity
cosmology
lagrangian-formalism
General solution to a tensor equation of this form?
general-relativity
tensor-calculus
What is the Hamiltonian of General Relativity?
general-relativity
hamiltonian-formalism
hamiltonian
Why is the mass dimension of the covariant derivative 1?
general-relativity
differentiation
dimensional-analysis
absolute-units
Does strong causality imply the existence of convex normal neighborhoods that are causally convex?
general-relativity
spacetime
mathematical-physics
metric-tensor
causality
Accelerated magnet magnetic field
electromagnetism
general-relativity
relativity
Introductory Book on General Relativity
general-relativity
Do the Planck voltage and the Planck current have a natural physical interpretation in classical general relativity?
electromagnetism
general-relativity
black-holes
physical-constants
absolute-units
How to decompose the Holst action in tetrad formalism using ADM formalism and find the hamiltonian?
general-relativity
gravity
quantum-gravity
loop-quantum-gravity
unit of metric functions
quantum-mechanics
general-relativity
astrophysics
potential
How do I get the Christoffel symbols in the Newtonian limit?
general-relativity
spacetime
metric-tensor
Can the fabric of space-time be contoured into hills instead of just wells?
general-relativity
gravity
spacetime
space-expansion
Can black holes slow down a planets time to months whilst millions of year pass elsewhere?
general-relativity
black-holes
time-dilation
space
Could gravity be an emergent property of nature?
general-relativity
gravity
cosmology
standard-model
research-level
Stress energy tensor components spherical coordinates
general-relativity
fluid-dynamics
metric-tensor
coordinate-systems
stress-energy-momentum-tensor
Relativity Problem: Time
general-relativity
special-relativity
What is space according to quantum mechanics?
quantum-mechanics
general-relativity
quantum-entanglement
space
non-locality
Wormholes and Closed Time-like Curves
general-relativity
wormholes
closed-timelike-curve
What is the singularity of an actual collapsing black hole?
general-relativity
black-holes
topology
singularities
Would the hubble horizon shrink for an observer in an accelerated frame of reference?
general-relativity
Why is the 4-velocity vector an absolute quantity?
general-relativity
reference-frames
vectors
tensor-calculus
inertial-frames
What's the point of the Hoyle–Narlikar theory of gravity?
general-relativity
gravity
modified-gravity
Minimal spin connection, and the standard content of GR
general-relativity
differential-geometry
tensor-calculus
differentiation