ds? = a²(t)(-dt is the scale factor. T 1,0) are received at D, 0, 0). Compute the

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Consider a cosmological spacetime in which the line element is given by
ds? = a²(t)(-dt + dr² + dy² + dz²),
where a(t) > 0 is the scale factor. Two light rays tangent to l = (1,1,0, 0)
and l = (1,0, 1,0) are received at time t =
u" = (a-'(to), 0, 0, 0). Compute the observed angle between the correspond-
ing images.
to by someone with 4-velocity
Transcribed Image Text:Consider a cosmological spacetime in which the line element is given by ds? = a²(t)(-dt + dr² + dy² + dz²), where a(t) > 0 is the scale factor. Two light rays tangent to l = (1,1,0, 0) and l = (1,0, 1,0) are received at time t = u" = (a-'(to), 0, 0, 0). Compute the observed angle between the correspond- ing images. to by someone with 4-velocity
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