timmdeeg's latest activity
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Ttimmdeeg reacted to PAllen's post in the thread Undergrad The quintessence as variable dark energy with
Informative.
While the FLRW metric, when used for a realistic universe, is purely an emergent approximation at large scales, there is one aspect of... -
Ttimmdeeg reacted to Ibix's post in the thread Undergrad The quintessence as variable dark energy with
Like.
You can formally model the evolution of fluctuations via perturbation theory. As I understand it, the point isn't really that "voids... -
Ttimmdeeg reacted to PeroK's post in the thread Undergrad The quintessence as variable dark energy with Like.
There are no voids in a homogeneous universe. If you want to study a local region of the universe, then you need to set up the...
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Ttimmdeeg replied to the thread Undergrad The quintessence as variable dark energy.That's the reason why I mentioned "voids expand faster because of under density" as an example. That seems to refer to the Friedmann...
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Ttimmdeeg replied to the thread Undergrad The quintessence as variable dark energy.This raises the question to which extent "the FLRW idealized model" is applicable locally? E.g. it is said that voids expand faster...
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Ttimmdeeg reacted to martinbn's post in the thread Undergrad Is there anything inside a black hole? with Like.
My question is how do you compare clocks that are far away from each other? The answer is that you need a simultaneity convention...
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Ttimmdeeg replied to the thread Undergrad Is there anything inside a black hole?.Yes, agreed.
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Ttimmdeeg replied to the thread Undergrad Is there anything inside a black hole?.The example shows that a far away clock ticks faster compared to a clock close to a black hole.
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Ttimmdeeg replied to the thread Undergrad Is there anything inside a black hole?.Compared to the duration of a far away supernova.
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Ttimmdeeg reacted to javisot's post in the thread Undergrad Is there anything inside a black hole? with Like.
What martinbn is trying to point out is that locally, time passes at the same rate at any point in the universe, even near an event...
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Ttimmdeeg reacted to Ibix's post in the thread Undergrad Is there anything inside a black hole? with Like.
It's worth noting that this is an over simplification, one which contributes to the confusion around black holes (IMO) by providing a...
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Ttimmdeeg reacted to PeterDonis's post in the thread Graduate Strong Progenitor Age Bias in Supernova Cosmology with Like.
That shouldn't be possible with a cosmological constant, because the energy density of matter and radiation can only decrease with...