swansont

I wouldn’t go so far as to say this makes sense. Does he offer up any testable predictions and experimental support? The bit I read looks very hand-wavy.

But there is no “outside” when considering the universe. You just need to make R bigger, and there is no effect.

Just a few days ago you claimed the opposite (“Yes, it would cause a net gravitational attraction and that would cause slowing of the universe expansion.”)

There’s no way to make an assessment without seeing the work and the comments

! Moderator Note Threads merged. One per topic, please.

It’s your link. If you’re offering it as support you should understand it. And is the crux if the issue here. You are throwing around equations without understanding the physics.

But then what of an observer some distance away? Everything must accelerate toward them, because the choice of the origin is arbitrary. Which can’t be true unless the acceleration is zero.

This is contradictory. If the accelerations cancel, there is net scceleration. We don’t have a sphere, and there is no center. The premise is we have mass uniformly distributed over all space.

A single plate would feel no force. Symmetry tells you this, but also there’s no exclusion of any of the QM modes.

How? It would all cancel.

AFAICT this is proposing to use the same calculational approach for the cosmological constant as for the casimir effect, in terms of dealing with infinities, i.e. the renormalization.

Perhaps not. It wouldn’t cause lensing or any net gravitational attraction.

It appears clumped? If it was clumping easily it would be at the center. Who claimed it was perfectly uniformly distributed?

Top Google hit for daily covid cases is the New York Times, and it gives a graph of daily cases, along with the 7-day average

AFAIK that’s why. If the only channel is gravitational radiation, then the dissipation is very, very weak. All collisions would be basically elastic.

Super-earths are not the same as earth-like So they would be visiting the solar system, and we would be able to detect them if they weren’t hiding.

I don’t think complete reflection is physically possible. Reflection requires a momentum transfer, since the momentum of the light changes, and thus energy transfer. So if energy is lost from the incoming light, the reflection can’t be complete.

I am not aware of this interaction. Can you point to any peer-reviewed literature that says that the cosmological constant interacts with anything? That’s what you said. An equality that you wrote down as an assumption. The casimir effect requires conducting plates, which force a component of the electric field to become zero, something not true in free space.

If you assume they exist, then “they don’t exist” can’t be part of the thought experiment.

How does that work, physics-wise? It looks like you’re just waving your hands to get the answer you want. How does it “become” the cosmological constant? The casimir force can be derived by applying the conductor boundary conditions to the geometry. If L doesn’t matter then you don’t get that answer.

We have ethics for when we expect people to self-police, and others involved to make sure people toe the line. In sports we have referees, because ethics don’t enter into it. If you foul someone, there is a penalty. You have to decide if it’s worth it. The sport makes the penalties harsher in certain situations to reduce the incentive to foul.

I would say your understanding is incorrect. A gap in a conductor in a vacuum will not pass current unless there is sufficient voltage for there form an arc. The impedance of the vacuum is ~377 Ohms. If it were a conductor, having a separation distance has no meaning. If you can make connection it has to be via some physics, not unit analysis I didn’t say it was a force; I used force as an example that unit analysis doesn’t get you a connection between different situations.

The casimir effect is, more precisely, a reduction of the electromagnetic vacuum energy owing to the presence of conducting plates. If you are going to equate this with the cosmological constant, you need to do more than unit analysis. A force is going to have units of force, regardless of the origin of it. You can’t e.g. say an electrostatic force is gravitational, just because they have the same units. IOW your assumption that these are connected would just lead to circular reasoning.

Can you explain what it is you’re trying to show? Just throwing up a bunch of equations isn’t sufficient.

One data point does not make a trend. Why might a particular publisher change a particular book from two volumes to one? Cost might be a factor. It’s possible that eliminating half of the book cover saves a few bucks. But I can find this as a two-volume set. (13th edition, at least. Later editions include modern physics, so the content is not the same)