<we><edit> <!-- questions and answers -->
velocity
cosmology
temperature
material-science
string-theory
electrical-resistance
particle-physics
acceleration
electricity
newtonian-mechanics
symmetry
hilbert-space
tensor-calculus
classical-mechanics
visible-light
water
friction
condensed-matter
speed-of-light
work
entropy
thermodynamics
schroedinger-equation
renormalization
electrons
general-relativity
Why these null coordinates are sometimes called "time"?
general-relativity
spacetime
time
terminology
coordinate-systems
How to find a metric of a general observer?
homework-and-exercises
general-relativity
differential-geometry
metric-tensor
What is the meaning of space-time curvature?
general-relativity
spacetime
differential-geometry
curvature
The Spin Connection
general-relativity
differential-geometry
tensors
Theory on the anatomy of a black hole
general-relativity
black-holes
event-horizon
singularities
hawking-radiation
Difference or relation between ADM mass, Brown-York Quasi-local mass, Komar mass
general-relativity
mass
Imaginary charge on black hole
general-relativity
black-holes
complex-numbers
reissner-nordstrom-metric
Killing tensor in Minkowski space
general-relativity
differential-geometry
tensor-calculus
Gravitational waves from a Binary: reasoning about metrics
general-relativity
Behavior of EM waves in general relativity
electromagnetism
general-relativity
gravity
waves
Equivalence of two definitions of the stress-energy tensor in general relativity
general-relativity
lagrangian-formalism
field-theory
stress-energy-momentum-tensor
What is the equation of a projectile motion as given by the general theory of relativity?
homework-and-exercises
general-relativity
geodesics
Reduce 10 Killing equations by the dependence of the metric to some coordinates
general-relativity
black-holes
differential-geometry
symmetry
metric-tensor
Concerning the origin of cosmological redshift
general-relativity
cosmology
space-expansion
redshift
Will modified gravity helps find new technologies or improve existing technologies in our life on Earth?
general-relativity
gravity
quantum-gravity
modified-gravity
Building a wormhole
general-relativity
wormholes
exotic-matter
Estimation of the size of a real black hole
general-relativity
black-holes
astrophysics
astronomy
Finding metric if i have Killing vector field
general-relativity
differential-geometry
symmetry
metric-tensor
vector-fields
Energy density of primordial gravitational waves- two different results for the same quantity?
general-relativity
waves
cosmology
perturbation-theory
cosmological-inflation
Very basic question on AdS/CFT
general-relativity
string-theory
metric-tensor
ads-cft
branes
Definition of a tensor
general-relativity
special-relativity
terminology
metric-tensor
tensor-calculus
Extreme confusion with the metric tensors
general-relativity
special-relativity
terminology
metric-tensor
relativity
If "time is relative", what does "the universe is 13 billion years old" mean?
general-relativity
cosmology
reference-frames
time
observers
Whats happens if more then two nuetron stars collide?
general-relativity
black-holes
spacetime
neutron-stars
Negative mass in Spacetime fabric
general-relativity
mass
curvature
FLRW cosmology with a scalar field : what are the phase-space variables?
general-relativity
cosmology
space-expansion
field-theory
phase-space
Entropy and the curvature of the Universe
thermodynamics
general-relativity
cosmology
entropy
curvature
If gravity isn't a force, then how are forces balanced in the real world?
newtonian-mechanics
general-relativity
forces
spacetime
Relativistic Doppler effect and Quantum Mechanics
quantum-mechanics
general-relativity
visible-light
doppler-effect
Useless question about General Relativity
general-relativity
Contradiction between Geroch's theorem on topology change and formation of naked singularity?
general-relativity
singularities
What is a general coordinate transformation?
general-relativity
differential-geometry
relativity
coordinate-systems
geometry
Is it possible the space-time manifold itself could stop at a black hole's event horizon?
general-relativity
black-holes
spacetime
topology
event-horizon
Does spacetime in general relativity contain holes?
general-relativity
spacetime
differential-geometry
topology
Could the spacetime manifold itself end at the event horizon?
general-relativity
black-holes
spacetime
topology
event-horizon
Why model spacetime as a semi-Riemannian manifold?
general-relativity
spacetime
differential-geometry
metric-tensor
equivalence-principle
Is the energy of an object standing in a gravitational field proportional to its clock rate?
general-relativity
energy
gravity
spacetime
potential-energy
When is a Cauchy surface non-compact?
general-relativity
differential-geometry
mathematics
topology
causality
What is the mass and density distribution of a Schwarzchild black hole in the viewpoint of distant observer?
general-relativity
black-holes
mass-energy
density
event-horizon
What is space made of?
general-relativity
gravity
spacetime
universe
vacuum
Laws of physics and diffeomorphism covariance
general-relativity
coordinate-systems
diffeomorphism-invariance
Reduce $\frac{A(r)}{B^2(r)}(\frac{dr}{dt})^2+\frac{J^2}{r^2}-\frac{1}{B(r)} = -E$ for a slowly moving particle in a weak field
general-relativity
gravity
metric-tensor
Books for general relativity
general-relativity
resource-recommendations
What are some good books to study General Relativity?
general-relativity
resource-recommendations
soft-question
Resolving General relativity and Newtonian mechanics on a computer
general-relativity
newtonian-gravity
computational-physics
simulations
When an object is in free fall from rest at an infinite radius, is its potential energy proportional to its clock rate?
general-relativity
energy
gravity
potential-energy
free-fall
What are some good reference books for “Spacetime And Geometry” by S.Carroll?
general-relativity
resource-recommendations
soft-question
Einstein Toolkit for numerical relativity
general-relativity
computational-physics
software
Do masses interact with each other or not?
general-relativity
quantum-gravity
curvature
virtual-particles
carrier-particles
One-particle states in curved spacetimes
quantum-field-theory
general-relativity
hilbert-space
symmetry
qft-in-curved-spacetime
Manifold for Schwarzschild and Bertotti-Robinson
general-relativity
black-holes
differential-geometry
coordinate-systems
topology
Black Holes 2D or 3D?
general-relativity
gravity
spacetime
event-horizon
singularities
Is a seismic gravity perturbation a gravitational wave?
general-relativity
waves
gravitational-waves
If a point $r$ lies in the boundary of the chronological future of another point $p$, why does the chronological future of $r$ belong to that of $p$?
general-relativity
spacetime
differential-geometry
topology
causality
Uniform Gravitational Field = No Gravitational Field?
general-relativity
gravity
spacetime
reference-frames
equivalence-principle
Variation of the Christoffel symbols with respect to $g^{\mu\nu}$
general-relativity
lagrangian-formalism
differential-geometry
metric-tensor
variational-calculus
Self coupled scalar field theory of gravity
quantum-field-theory
general-relativity
gravitational-waves
higgs
Sciama's paper, On the origin of inertia
general-relativity
dimensional-analysis
inertia
What is the escape velocity in the Kerr metric?
general-relativity
black-holes
escape-velocity
kerr-metric
What is a suitable book to learn general relativity for high school students?
general-relativity
resource-recommendations
soft-question
Turbulent spacetime from Einstein equation?
general-relativity
gravity
spacetime
turbulence
non-linear-systems
Why are distances in cosmology larger with $\Lambda$?
general-relativity
cosmology
distance
cosmological-constant
Action in curved space
general-relativity
lagrangian-formalism
notation
action
covariance
How will the Twin Paradox become, for Time Dilation, if no acceleration was ever involved?
general-relativity
special-relativity
relativity
twin-paradox
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
Rather than matter curving space-time directly, what if it's gravity's messenging particle?
quantum-mechanics
general-relativity
gravity
At what moment will matter falling into a black hole affect its size?
general-relativity
reference-frames
observers
event-horizon
singularities
Calculating the matter-energy density of the Universe
general-relativity
spacetime
Necessity of the Gibbons-Hawking-York (GHY) boundary term
general-relativity
lagrangian-formalism
variational-principle
boundary-conditions
boundary-terms
What are the prerequisites to study General Relativity?
general-relativity
resource-recommendations
education
Schwarzschild geometry, what is physical meaning of coordinates?
general-relativity
black-holes
metric-tensor
coordinate-systems
observers
Twin paradox for an orbiting twin
general-relativity
special-relativity
time-dilation
What is the curvature of an empty universe?
general-relativity
cosmology
universe
curvature
asymptotic curvature of the universe and correlation with local curvature
general-relativity
cosmology
dark-energy
curvature
How would you calculate the age of a non-flat universe?
general-relativity
cosmology
time
curvature
Causally benign spacetimes and the Minkowski torus
general-relativity
field-theory
boundary-conditions
closed-timelike-curve
General Relativity applied on Earth
general-relativity
gravity
spacetime
acceleration
curvature
Schwarzschild black hole spacetime in Kruskal-Szekeres coordinates
general-relativity
black-holes
coordinate-systems
event-horizon
singularities
Textbooks using abstract index notation
general-relativity
resource-recommendations
notation
mathematics
What is the actual importance of Dixon's extended bodies theory for fundamental physics?
general-relativity
classical-mechanics
gravity
education
research-level
How are the symmetries of $g_{\mu\nu}$ reflected in those of $T_{\mu\nu}$?
general-relativity
cosmology
symmetry
metric-tensor
stress-energy-momentum-tensor
Silly conceptual doubt about Einstein Field Equations (EFE)
general-relativity
curvature
stress-energy-momentum-tensor
Are gravitational time dilation and the time dilation in special relativity independent?
general-relativity
special-relativity
Mass identification in Schwarzschild spacetime
homework-and-exercises
general-relativity
black-holes
mass
metric-tensor
Physical reality of inner event horizon and inner ergosurface in a rotating black hole in D. Wiltshire et al. "The Kerr spacetime"
general-relativity
black-holes
event-horizon
kerr-metric
closed-timelike-curve
Geodesic Deviation Equation
general-relativity
geodesics
What are the Maxwell's equations for gravitational waves?
general-relativity
electromagnetic-radiation
gravitational-waves
linearized-theory
Physical motivation for mathematically extending solutions to Einstein's equations
general-relativity
kerr-metric
reissner-nordstrom-metric
Thought Experiment Spaceship Accelerating from Earth
general-relativity
Can black holes form in a finite amount of time?
general-relativity
black-holes
time
observers
Causal ordering on spacetimes
general-relativity
spacetime
causality
Attributing direction as well as metrical structure to space - What did Einstein mean?
general-relativity
spacetime
soft-question
metric-tensor
unified-theories
What is the relationship between gravity and inertia?
general-relativity
gravity
inertia
Gödel's Solution as background for a star patch
general-relativity
gravity
spacetime
stars
structure-formation
Research about extended bodies in Einstein-Cartan gravity
general-relativity
gravity
differential-geometry
resource-recommendations
research-level
What experiments prove the equivalence principle?
general-relativity
How much Gravity is required to stop time?
general-relativity
gravity
spacetime
reference-frames
metric-tensor
What is the 4-spin vector of a photon?
general-relativity
photons
quantum-spin
Can we square the constant representing stationary energy without loss of generality?
general-relativity
Magnetic monopoles in gravity theories: do they induce torsion?
general-relativity
gravity
magnetic-monopoles