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 Mar 31 awarded Student Mar 31 comment Why is light described by a null geodesic? +1 for coord transformation. Mar 31 comment Do photons have acceleration? This is not exactly acceleration of a photon. The photon is still following a null geodesic, so in the frame of the light, there is no acceleration. There might only appear to be some acceleration to another observer. Mar 31 answered Question with Einstein notation Mar 31 comment How to interpret the derivative in the momentum operator in quantum mechanics? Never assume commutativity in QM unless you're sure of it. Mar 31 answered At what point does a projectile leave a slingshot? Mar 31 asked Why is light described by a null geodesic? Mar 31 comment Why you need a graviton when you have the higgs boson? In the linear approximation, GR predicts gravity waves, which can be described by gravitons. This explanation comes up independent of the Higgs Boson. The need for one doesn't really have any bearing on the other. Mar 31 comment Is 4-velocity normalized to -1 even for non-geodesic timelike curves? A geodesic, being defined as a curve whose tangent vector doesn't change along that curve (parallel transports its own tangent vector), will always return the same norm for that unchanged tangent vector. The same can't be said of other curves, because they don't necessarily have the same tangent vector at different points. Mar 29 awarded Citizen Patrol Mar 29 answered Will tensile strength keep a cable from snapping indefinitely? Mar 29 answered What is the difference between a moment and a couple? Mar 29 answered A spinning bullet Mar 29 comment More on the Feynman Path Integral Formula in Brian Cox' Lecture and its Consequences Comment 3: Typo. Fixed it. That line was just multiplying both sides of the inequality by $\Delta t$. Mar 29 awarded Editor Mar 29 comment More on the Feynman Path Integral Formula in Brian Cox' Lecture and its Consequences Comment 2: Since you've divided both sides of the equation by the same number, they're still equal. You then say this new number is less than 1, because of the inequality you had before. Mar 29 revised More on the Feynman Path Integral Formula in Brian Cox' Lecture and its Consequences Typo in equation. Mar 29 comment More on the Feynman Path Integral Formula in Brian Cox' Lecture and its Consequences Comment 1: $m(\dfrac{\Delta x}{\Delta t})^2 \Delta t = m \dfrac{\Delta x^2}{\Delta t^2} \Delta t$. The $\Delta t$ on the left cancels out the $\Delta t$ under the line. Mar 29 awarded Supporter Mar 29 answered The relativistic mechanics of a battery that is being charged and accelerated at the same time