746 reputation
719
bio website
location
age
visits member for 3 years, 1 month
seen 7 hours ago

Aug
22
comment Why complexify in order to construct Dirac representation?
"why" is clearly a request for motivations. He wants to understand what is gained by using that representation. Why this was proposed in the first place. Not hard to understand!
Aug
20
comment Why is an Alcubierre drive shaped like it is
I think you meant the Natario drive, Naruto is a character from an anime :-)
Aug
19
comment Anti-centrifugal force?
are you certain that the balls are denser?
Aug
11
asked Measured versus Predicted Energy gain in Tokamaks with size
Aug
10
comment Is antimatter power theoretically possible?
it still makes sense to store small quantities to catalyse nuclear fusion reactions
Aug
10
answered Is antimatter power theoretically possible?
Aug
8
asked Can you compare curvatures in space, spacetime and hidden space?
Jul
18
comment Curvature of spacetime and the equivalence principle
the equivalence principle only holds for the first order terms on metric coefficients, and Ricci tensor depends on second order derivatives of the metric.
Jul
15
comment Pure hydrogen star
I never liked the convention of counting star population like that. Intuitively one would expect that oldest stars be labelled 'population I', or at least, population III should have been labelled 'population 0'. Oh well
Jul
13
revised Exponential tower
edited body
Jul
13
asked Exponential tower
Jul
13
awarded  Yearling
Jul
11
answered Dimensional scaling of structural stiffness
Jul
11
comment Dimensional scaling of structural stiffness
the factor $\lambda$ affects all dimensions proportionally, that is the point. So what it means is that a rod with all its dimensions multiplied by ten, will have a stiffness multiplied by ten. So a larger rod is always stiffer than a smaller rod, and I'm hearing you giggle, please don't, this is serious ;) The point is that this scaling behaviour seems counterintuitive
Jul
11
asked Dimensional scaling of structural stiffness
Jun
25
answered What does it mean to say that “remembering the future and not the past?”
Jun
16
comment Quantum superposition of macroscopic objects
the disintegration of the nucleus entangled both the macroscopic state of the cat and the nuclear decay, but everything you do afterwards happens under the same rules of delayed-choice experiments
Jun
16
comment Quantum superposition of macroscopic objects
well, suppose that you simplify the cat and just replace it with a sturdy 1x1x1 cm block of ferromagnetic material at 1 Kelvin in a vacuum chamber and you use some resonance to set all the spin up and down in superposition. Decoherence time would be reduced by several orders of magnitude right?
Jun
16
asked Quantum superposition of macroscopic objects
Jun
15
comment How would the laws of nature behave if we reversed time?
such a clock is a reversible system, but it still measures time