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seen Sep 7 at 21:37

Oct
24
awarded  Popular Question
Jul
20
accepted Peaks and dips position in the Planck CMB
Jul
19
asked Peaks and dips position in the Planck CMB
Jul
17
awarded  Popular Question
Jul
10
comment Units and missing constants in quintessence expressions?
@KyleKanos: well spotted. First, personnally, if I do not know the physical dimensions of the quantities I am manipulating I consider that there is a problem. Second, if you are scaling everything in the same manner, it does not change the precision since your floating point numbers are still represented by a mantissa and an exponent (and in double precision you can go up to 10^308 before starting to have problems...)
Jul
10
revised Units and missing constants in quintessence expressions?
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Jul
10
comment Units and missing constants in quintessence expressions?
@AntonioRagagnin: this is what they say. But my personal experience with some particle physicist is that they have a hard time when a numerical physicist come to ask them the units of the quantity they are manipulating... (and the simple fact that this question has not been answered yet suggest that this is not that simple)
Jul
10
comment Units and missing constants in quintessence expressions?
@KyleKanos: I agree, they are not neglected, the equation is juste in natural units.
Jul
10
asked Units and missing constants in quintessence expressions?
Jul
7
awarded  Tumbleweed
Jul
2
awarded  Curious
Jun
30
asked Angular diameter distance in an inhomogeneous universe?
May
20
awarded  Popular Question
May
15
comment Luminosity distance from angular diameter distance
I don't care whether it is close or not ... I want to know if it is true or not...
May
15
comment Luminosity distance from angular diameter distance
@Jim Ok, I will rephrase the problem the other way. Consider a completely perturbed Universe in which I know, for a particular object: $x_{object}$ and $\theta_{observer}$ (I know them numerically, I do not have any expressions of them). Is there a way to compute $D_{L}$ from that ?
May
15
comment Luminosity distance from angular diameter distance
@Jim I wonder whether the relation you point out is valid in a perturbed Universe.
May
15
asked Luminosity distance from angular diameter distance
May
13
asked Angular and luminosity distance in general?
May
5
answered Trajectory of a photon around a Schwarzschild black hole?
May
5
revised Trajectory of a photon around a Schwarzschild black hole?
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