162 reputation
9
bio website http:www.musiikerbeta.appspot…
location Spain
age
visits member for 1 year, 11 months
seen Apr 10 at 8:47

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
Jan
18
comment Different kinds of the same isotope
Thank you! I used google too and found nothing... weird.