andrew s 1905's latest activity
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Aandrew s 1905 replied to the thread B How can dark energy comprise 74% of the Universe?.But they are related contrary to your statement. Light has to cross the Hubble sphere to reach us. See section 3.3...
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Aandrew s 1905 replied to the thread B How can dark energy comprise 74% of the Universe?.Yes. But how far we can see is related to... I agree you can argue they have the same underlying cause. I have learnt my lesson...
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Aandrew s 1905 replied to the thread B How can dark energy comprise 74% of the Universe?.Ok I give up. @PeterDonis why say this You now say this I explicitly did not equate them at the same time. For the last time I said...
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Aandrew s 1905 replied to the thread B How can dark energy comprise 74% of the Universe?.The current observable Universe is how far we can see now. That is not how far we will be able to see in the future. Which is what I...
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Aandrew s 1905 replied to the thread B How can dark energy comprise 74% of the Universe?.I know that. I never said if was. Regards Andrew
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Aandrew s 1905 replied to the thread B How can dark energy comprise 74% of the Universe?.As I understand it the Hubble sphere is expanding so in the future we will be able to see further than current size of the observable...
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Aandrew s 1905 replied to the thread I Transparency of a gas compared to a plasma.The spectra of the light emitted at the photosphere of the sun , as an example, matches that received at the top of our atmosphere very...
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Aandrew s 1905 replied to the thread I Transparency of a gas compared to a plasma.If there are strong magnetic fields to accelerate free electrons in a plasma then they will emit cyclotron radiation. Also significant...
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Aandrew s 1905 reacted to PeterDonis's post in the thread I Justification of a trick in solving PDEs arising in Physics with
Like.
No. It is not the case that every solution of an equation must have the same symmetry as the equation. What is the case is that the... -
Aandrew s 1905 reacted to vanhees71's post in the thread B Is a photon an excitation of the electromagnetic field? with Like.
A one-photon Fock state is a specific state of the free electromagnetic field. If you take a cavity then you can define proper...
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Aandrew s 1905 reacted to robphy's post in the thread A GR vs. alternative theories of gravity with Like.
You can start with Clifford Will’s 2014 survey The Confrontation between General Relativity and Experiment...
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Aandrew s 1905 posted the thread A GR vs. alternative theories of gravity in Special and General Relativity.As per the summary I would like to find a review paper, monograph or book. Google is not find any recent reviews. Post 2018 would be...
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Aandrew s 1905 replied to the thread I Some questions about absorption lines.Q1 the spectrum is cut up and stacked. Take the right hand edge of the strip below and attach it to the left hand edge to the one above...
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Aandrew s 1905 reacted to PeterDonis's post in the thread I Astronomy in a Simple Solar System with Like.
Sure, if he's only looking at the Earth and the Moon. Once he includes the Sun in his model he might see things differently.
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Aandrew s 1905 replied to the thread I Astronomy in a Simple Solar System.I am not disputing your technical definition but given the baricenter of the Earth Moon system is inside the Earth a Galileo observing...