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General-relativity
New post in General-relativity
Does time really exist?
July 22nd, 2022
general-relativity
time
Why does an apple fall to the ground according to GR?
December 17th, 2020
gravity
general-relativity
forces
Why does gravity attract non-metallic objects?
July 11th, 2020
general-relativity
How to find the intrinsic covariant derivative component?
January 2nd, 2020
differential-geometry
covariance
differentiation
general-relativity
Time dilation and biological changes
April 17th, 2021
time-dilation
general-relativity
biology
Normal frames, locally inertial frame and freely falling frame?
January 29th, 2020
metric-tensor
reference-frames
general-relativity
Calculating the radius of a black hole
June 8th, 2020
astrophysics
general-relativity
homework-and-exercises
black-holes
estimation
Does time exist without Gravity?
February 21st, 2020
observers
general-relativity
event-horizon
time
spacetime
Proof that Energy Momentum Tensor of Scalar Field Theory satisfies Weak Energy Condition
March 10th, 2020
general-relativity
field-theory
spacetime
energy
Killing vectors in flat FLRW metric
June 26th, 2020
general-relativity
geodesics
differential-geometry
cosmology
Difference between slanted indices on a tensor
August 1st, 2022
general-relativity
notation
tensor-calculus
metric-tensor
The Sun as a gravitational lens
August 1st, 2022
general-relativity
gravity
visible-light
sun
curvature
Why is matter drawn into a black hole not condensed into a single point within the singularity?
May 13th, 2020
black-holes
general-relativity
singularities
Potential Energy in General Relativity
August 1st, 2022
general-relativity
potential-energy
geodesics
stress-energy-momentum-tensor
binding-energy
Erik Lentz's faster-than-light soliton
May 12th, 2021
warp-drives
general-relativity
faster-than-light
solitons
When will the Hubble volume coincide with the volume of the observable Universe?
May 12th, 2020
cosmology
dark-energy
general-relativity
Understanding Einstein's field equation
July 23rd, 2020
general-relativity
In the static spacetime, the extrinsic curvature of hypersurface $t=constant$ is zero
August 1st, 2022
homework-and-exercises
general-relativity
differential-geometry
curvature
How could we travel to the nearest supermassive Black hole?
August 1st, 2020
general-relativity
black-holes
popular-science
warp-drives
Do gravitational fields exist in vacuum region?
September 25th, 2020
general-relativity
Geodesic deviation equation - why does the ordinary second derivative give the correct answer?
October 20th, 2020
general-relativity
differential-geometry
geodesics
Is my interpretation of how a gravitational wave is formed correct?
October 21st, 2020
general-relativity
mass
spacetime
gravitational-waves
Does time dilation cause gravity as explained in this video?
August 13th, 2022
general-relativity
gravity
spacetime
curvature
Why is Minkowski spacetime in polar coordinates treated in texts as flat spacetime?
June 27th, 2020
general-relativity
differential-geometry
metric-tensor
tensor-calculus
curvature
Generalized divergence of tensor in GR
October 2nd, 2020
general-relativity
differential-geometry
tensor-calculus
definition
differentiation
Does isotropy imply homogeneity?
August 1st, 2022
general-relativity
cosmology
spacetime
symmetry
metric-tensor
Dirac Lagrangian density in curved spacetime
June 12th, 2020
qft-in-curved-spacetime
dirac-equation
lagrangian-formalism
general-relativity
quantum-field-theory
Lorentz invariance of the 3 + 1 decomposition of spacetime
August 11th, 2022
hamiltonian-formalism
differential-geometry
symmetry
general-relativity
How is the second-order covariant derivative of a scalar computed?
August 1st, 2022
homework-and-exercises
differentiation
metric-tensor
differential-geometry
general-relativity
How to find the Stress-Energy tensor?
January 8th, 2020
stress-energy-momentum-tensor
action
lagrangian-formalism
general-relativity
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