Jaime Rudas's latest activity
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Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.Taking this into account, could you indicate the calculation to support your claim that the distance between Earth and Alpha Centauri... -
Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.I think you're the one who should answer that, since you were the one who stated that the distance between Earth and Alpha Centauri...
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Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.Yes, it's true, I made a mistake when I said I was referring to the length of the path traveled, when what I had in mind was the...
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Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.Yes, that's right. That's precisely what I said in post #4.
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Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.##D=\int_{t=0}^{13.8} v_{pec} dt = \int_{t=0}^{13.8} c dt= 13.8 Gly##
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Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.Davis & Lineweaver present their equations 19 and 20 as follows: As I see it, the velocity I defined is nothing other than what D&L...
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Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.Locally (that is, at each point), in an expanding universe, the speed of light is c. If I integrate it with respect to time, I get the...
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Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.No, what I'm referring to is the speed of light understood as the length of the path travelled by light in vacuum per unit of time.
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Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.So in curved spacetime the speed of light is not c?
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Jaime Rudas replied to the thread Undergrad Does the Alcubierre drive shorten distances?.By definition, a light-year is the length of the path travelled by light in vacuum during a time interval of one (Julian) year. From...
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Jaime Rudas replied to the thread Undergrad Help Understanding the Hubble Constant's Units.As a curious fact, it seems that Hubble never actually called it that. The earliest appearances of the term 'Hubble constant' that I...
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Jaime Rudas replied to the thread Undergrad Help Understanding the Hubble Constant's Units.Yes, the Hubble constant ##H_0## is constant in space, not in time.
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Jaime Rudas replied to the thread Undergrad Help Understanding the Hubble Constant's Units.Actually, that constant wasn't just 'invented' 100 years ago; it's a direct consequence of applying general relativity to a homogeneous...
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Jaime Rudas replied to the thread Undergrad Help Understanding the Hubble Constant's Units.Yes, when we talk about cosmological distances, we generally refer to space-like separations between comoving objects.
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Jaime Rudas replied to the thread Undergrad Help Understanding the Hubble Constant's Units.Another way to visualize what 70 km/s/Mpc is equivalent to is to show that something expanding at that rate will double its size in...