carllacan
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 Apr 11 awarded Notable Question Jul 2 awarded Curious Feb 25 awarded Popular Question Feb 1 comment Light cones and reference frames Let me reword my question: what stops us from choosing a frame in which two events separated by a timelike interval have the same or reversed order? What is the constraint that forbids us to do so that does not apply on events separated by spacelike intervals? Feb 1 asked What does it mean to divide space and time? Jan 30 comment Converse of the Lagrangian form-invariance That last link is the most illuminating thing I read about mechanics in a month. I cannot thank you enough, is the first explicit definition of $\delta q$ I've seen. Jan 30 comment Converse of the Lagrangian form-invariance Simply perfect. Thank you. Just a detail: I've read somewhere that the function A could depend on velocities, but we would need to know the final velocities. I don't understand what this means. In the third step of your prove the two A functions cancel each other because the q coordinates don't change from tb to ta. But why shouldn't the velocities change? Jan 30 accepted Converse of the Lagrangian form-invariance Jan 30 asked Converse of the Lagrangian form-invariance Jan 25 awarded Tumbleweed Jan 21 comment Light cones and reference frames Suposing a (2 + 1)-dimensional space we can draw a cone that delimits spacetime intervals and timelike intervals. I am curious about how these transformations would be represented on that (2 + 1)-dimensional space. Jan 21 comment Light cones and reference frames I know that. My question was how would these frames "look like". Jan 19 comment What causes different decays? I see. Which characteristics of the isotopes determine then (through Quantum Field Theory calculations) which decays are "available" for a specific nucleus? Jan 19 comment What causes different decays? Thank you, perfectly explained. However I don't think I understood the final part.Do you mean that the decay rates influence one another? Jan 19 accepted What causes different decays? Jan 19 asked Light cones and reference frames Jan 19 asked What causes different decays? Jan 19 accepted What determines the distribution of the energy between the beta-particle and the neutrino in beta decay? Jan 18 asked What determines the distribution of the energy between the beta-particle and the neutrino in beta decay? Jan 18 accepted Different kinds of the same isotope