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2d
answered Are black holes really just neutron stars?
Apr
20
answered Why is a theory Lorentz invariant if the Lagrangian is Lorentz invariant?
Apr
19
answered Where does the energy of a photon trying to escape a black hole go?
Apr
18
answered $f^{\prime}(R)=0$ in $f(R)$ gravity
Apr
14
answered Why does positive work done by internal conservative forces $\implies$ decrease of potential energy?
Apr
8
answered Why is the mass of a Kerr black hole proportional to its angular momentum?
Apr
1
answered What Color Are Black Holes Really? (Yes, a serious question)
Apr
1
answered What is the purpose of the Maxwell Stress Tensor?
Mar
23
answered Negative mass thin shell collapse
Mar
8
answered Effect of general relativity on Newton's second law
Mar
5
answered How does the gravitational field behave inside a star?
Mar
1
answered Kerr Metric from rotated Schwarzschild?
Mar
1
answered Why do we say that photons are particles?
Feb
29
answered Do the LIGO observations constitute proof of a black hole merger, and what happened to the black holes?
Feb
29
answered Time reversal in simple *solution* to equation of motion
Feb
22
answered Gravitational self-interaction
Feb
20
answered Moving black holes
Feb
19
answered Using normal rules of gravity, How would gravity work on a flat “world”?
Feb
17
answered What is the speed of gravity in a Schwarzschild metric?
Feb
17
answered Why relativity doesn't rule out Inflation theory?