Understanding causality violation of tachyons in space-time diagrams
26363
How does faster than light travel violate causality?
34004
Why is time evolution unitary?
45763
Minkowski diagram and length contraction
87914
Contradictory result for scalar-field propagator from Feynman rules and LSZ formula
112452
Why does dark energy produce positive space-time curvature?
106506
How to derive completeness relation in quantum field theory with a Lorentz invariant measure?
2786
The staircase paradox, or why $\pi\ne4$
125565
Counting the number of propagating degrees of freedom in Lorenz Gauge Electrodynamics
31390
What prevents photons from getting mass from higher order Feynman diagrams
38467
Interpreting the Kretschmann scalar
150283
Prerequisites and introduction to string theory
105865
The twin paradox and positively curved space
38723
Can Poincare representations be embedded in non-standard Lorentz representations?
106863
Special relativity and imaginary coefficient of the time coordinate
99312
Why Lagrangian is negative number for a relativistic massive point particle?
37973
Space-time in String Theory
121904
Regarding the possibility of Closed Timelike Curves