rocknrollkieran's latest activity
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Rrocknrollkieran replied to the thread B Conservation of kinetic energy in expanding space.But at the inception of this single atom universe, matter is everywhere - it occupies the entire space, until space starts expanding. As...
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Rrocknrollkieran replied to the thread B Conservation of kinetic energy in expanding space.But a single hydrogen atom is 'matter', so if that is surrounded by expanding space, why does that not qualify as a universe?
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Rrocknrollkieran replied to the thread B Conservation of kinetic energy in expanding space.Sorry I'm not making myself very clear. Let's assume that a universe (not ours, but subject to the same laws of physics) consists of a...
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Rrocknrollkieran replied to the thread B Conservation of kinetic energy in expanding space.No, I mean the space around the atom
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Rrocknrollkieran replied to the thread B Conservation of kinetic energy in expanding space.If our expanding universe consisted of just a single atom, would it's energy just leak away over time until eventually it entered the...
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Rrocknrollkieran reacted to jbriggs444's post in the thread B Conservation of kinetic energy in expanding space with
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The easy answer is that energy is not conserved in an expanding universe. The law of conservation of energy follows (via Noether's... -
Rrocknrollkieran replied to the thread B Conservation of kinetic energy in expanding space.So if we conclude that in an expanding universe objects moving at a fixed velocity and not interacting with other objects will lose...
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Rrocknrollkieran replied to the thread B Conservation of kinetic energy in expanding space.In a contracting universe would we expect to see the cosmic microwave background radiation become more blue-shifted - eventually moving...
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Rrocknrollkieran reacted to jbriggs444's post in the thread B Conservation of kinetic energy in expanding space with Like.
One can define the kinetic energy associated with peculiar movement relative to a co-moving coordinate system. In an expanding universe...
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Rrocknrollkieran reacted to Bandersnatch's post in the thread B Conservation of kinetic energy in expanding space with Like.
As I see it, the poster is asking about an effect opposite to objects in expanding space asymptotically joining the Hubble flow over...
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Rrocknrollkieran posted the thread B Conservation of kinetic energy in expanding space in Other Physics Topics.Classically an object moving at a constant velocity in a straight line will continue to move at the same velocity until it encounters an...