swansont

Excellent arguments for why it should not be recognized as a dimension; if it’s in your mind I can’t observe it or measure it.

How about ‘mental space’? Or ‘imagination’? Or ‘the twilight zone’? No. It’s not physical, so it doesn’t belong there. Such things are studied already. In neurology, psychology, and other fields.

How does your conclusion follow from the quote? What kind of radiation is it?

Local ≠ co-located

Isn’t the sun’s (or earth’s) field approximately a solution to the Schwarzschild geometry? They are equal, but isn’t that a static solution? And if you perturb the energy-momentum, don’t you get a lightlike fluctuation in the curvature? How is it not local? Gravitational waves are a dynamic effect, though. What if we limit ourselves to a static configuration?

Isn’t the separation of momentum-energy and curvature lightlike? The fluctuations (gravitational waves) propagate at c What’s the curvature of the Schwarzschild solution? I’m confused. “The Schwarzschild geometry describes the spacetime geometry of empty space surrounding any spherical mass” https://jila.colorado.edu/~ajsh/bh/schwp.html

This implies that lightlike separations are not causal.

Length is a concept, “observable” as an interval between objects. But you need the objects, like you need events to measure time.

Hmm. This post wasn't here a moment ago... By this metric, length isn't observable, either

How is this a dimension in a physics sense?

What is the algebraic form of that component?

! Moderator Note This is not the place to go fishing for contributors or to advertise a service.

KJW responded to/quoted me, not the other way around, so if they were not engaging in the context of what I was talking about it’s on them, not me. To add to that, I had already written about some of the points raised. These were ignored.

My default is to take threads at face value and not read anything into them.

Natural? That’s rather subjective. Why does it have to? In the first case you’re explaining what causes the redshift. Nothing else. True gravity? The equivalence principle says you can’t distinguish it from other acceleration. But one can make that association. And that’s also an equality one can write down. I hardly think time dilation can be considered a phenomenon we all experience, considering the sophistication of the equipment necessary to detect it. Well, that’s rather convenient. The original suggestion was that time causes gravity, and that this was a consensus. What textbooks teach this, as apposed to energy-momentum and curvature? What’s the breakdown in the literature? Not liking an explanation is not really a consideration. And how does a clock “know” that its time dilation is gravitational?

All you’ve shown is an equality. That’s not causality. Are there any other equations for gravitational acceleration in GR? Also, please address my comments about kinematic dilation, which you’ve ignored.

Because science isn’t here to conform to your preferences. The world doesn’t revolve around you. The people who actually do science get to name things. Sometimes names provided by others stick, and inertia takes over. None of these avenues (or other possible ones) involves consulting you for approval. Perhaps a unit of hubris could be named for you.

Motors don’t always spin freely. The unconnected motors may be offering too much resistance for the car to move. Does the car roll very far if you just push it (no batteries)?

If you post what did, then yes. Otherwise there’s no point in quoting me and detailing that what I posted was not coerced. Posting a news item is not necessarily an endorsement, and providing a quote so that one need not go to the link for details is an expected compliance with the rules. Feel free to start up a thread detailing how to solve global warming without taxes and tariffs. Just being a naysayer is easy.

! Moderator Note You already have a thread on this. One per topic, please.

Yes. You should use a search engine to find them.

Did I claim that this solves a problem? Did I? Please provide a quote. And explain how this is pertinent.

Indeed. If only I had demonstrated my understanding by saying "Some countries don’t spend the 2% of GDP on defense like they are supposed to, but that money isn’t owed to the US." Oh, wait - I did. He has said it so many times, it's obviously what he thinks is supposed to happen. A) I never said that (I did not mention Germany, it's only in the Trump quote) B) I wrote it (as a counter to Trump's statement) AFTER you said "you might get called a 'Trumpet' " so unless you are time-traveling, that's not what inspired your original statement. My original observation didn't even mention NATO. I've pointed out a few places now where you were wrong. Maybe you should stop digging. You keep accusing me of things I did not say, and making a minor issue into a bigger one.

Since I was quoting Trump (there are even quotation marks and a link to the original) to demonstrate his confusion, I don’t see why you think the misunderstanding is mine.

No, Trump accused them of not paying the US, like it was some sort of protection racket. “Out of the 28 countries, 20 of them are delinquent. You know what the “delinquent” means? That’s an old real estate term. “He’s delinquent with his rent.” They’re delinquent with their payment. They owe us a tremendous amount of money and they never pay us back. Because if Germany doesn’t pay — they don’t add that up, they just say, “Oh, that’s okay.” Then they don’t pay. And yet, they’re — if you go back that way, like the old fashioned way –like you don’t pay and you owe it. But they don’t pay and they just go on to the next year. They owe us hundreds and hundreds of billions of dollars.” https://trumpwhitehouse.archives.gov/briefings-statements/remarks-president-trump-signing-executive-orders-transparency-federal-guidance-enforcement/ Some countries don’t spend the 2% of GDP on defense like they are supposed to, but that money isn’t owed to the US. My point is that if the “geopolitical centre of gravity” needs to move toward other democracies, they will need a military that can project power when necessary. That’s not the same mission as NATO, i.e. providing defense against Soviet (now ex-Soviet) threats, and not a matter of hitting an arbitrary threshold of spending. e.g. Building aircraft carriers to send outside your home waters and putting the military in harm’s way are issues of political will, and if one wishes the US to have less relative influence, others will have to exert more.