MigL

People keep kicking them. They handle one more than the other. Looks like you had a vasectomy; one still has visible stitches ...

Not without defining 'moral' first. ( do you consider 'moral' an axiom, or self apparent truth ? ) We should all be talking about the same thing, should we not ?

If you're going to 'make fun' of anybody's appearance, at least have the balls to post your own photo ( not Brad Pitt or Leo DeCaprio either ) so we can compare ... Or maybe post in the Political Humor forum.

Is it morally acceptable to want the best for your kids? Of course it is. But we know it is wrong to pay to get them accepted into a prestigious school; and people have gone to jail for that. Or is it? Many people get away with it by making 'donations'. Who draws the line ? Is it morally acceptable to steal from a crook? Most people would be confortable with that. How about when that robbery gets the crook killed by his mob boss? I could give many such examples of ambiguous 'morals' and 'ethics'. People usually subjectively justify what is good for themselves; there is no absolute morality.

who's ethics and who's morals are you considering here, Dim ? And why do they supersede other's ethics and morals ? You do realize that they are subjective concepts and differ for different people, don't you ?

The principles that must be respected by GDPR, in the EU, are fair and lawful processing; purpose limitation; data minimisation and data retention. How is Science Forums violating these principles ?

In Star Trek OS, A Taste Of Armageddon ( S01E23 ), the Enterprise is accidentally caught in a simulated attack between two worlds that have been at war for 800 years. They have 'sanitized' war, with simulations and disintegration chambers for those targetted, so much that there is no reason to end wars or avoid them in the first place. Kirk decides to destroy the targetting computers, give them back the horrors of real war, and tells them to start negotiating a peace if they want to avoid those horrors. Drone strikes, proxy wars, and other means of sanitizing war are counter-productive. It is the horror of millions of people losing their lives that helps prevent it from happening. ( yes, I've learned many life lessons from Star Trek )

Exactly. The inherent infinities cannot be 'renormalized' away, and make the theory unworkable and incapable of making any valid predictions. Hope your time away from the forum wasn't all work ...

All computers, no matter the technology used, have a common property Garbage in ... garbage out. IOW, if you don't know how to solve the problem, you cannot program a computer to do it.

In any quantity of water there are a number of molecules which dissociate and re-associate H2O <> H+ + OH- The potential Hydrogen is an inverse logarithmic measure of the number of H+ ions in solution and their reactive potential; and the reason water has a 'neutral' pH of 7. I'm sure Wikipedia has an entry for pH.

I have mentioned this many times in the past; frames of reference are very important in relativity. Considering an event from the wrong frame usually yields nonsense, and has led to much confusion in past threads. Leaving aside the fact that a FtL ship is already capable of violating causality, it may, in fact, be possible for a FtL ship to send a FtL message without violating causality, but only in the frame of that FtL ship. That doesn't change the fact that it will violate causality for every other timelike observer who is not in that particular frame. That is also what a space-time diagram does, Moon. It separates the timelike ( where events are separated by an interval which allows for causal connection) from the spacelike ( FtL domain where events cannot affect other events ) by the lightlike line ( the SoL ). A 3dimensional representation would be a light cone.

Are we watchig the same video Moon ? At 17 min he says 'the problem of causality violation is not with relativity but with FtL itself". Your misunderstanding may stem from the fact that you are missing an important bit of information which he last explains at 14 min. He says that the "world line defines the time axis as perceived by those following it", further he states "the time axis for the crew of that FtL ship actually lives along that timeline". The rest of the universe does not. So while an FtL transmission from an FtL moving ship may not violate causality to those aboard that ship only, the fact remains that they are already violating causality by moving FtL. I suggest you re-watch without your 'wishful thinking' glasses on.

Keep in mind that QFT stands for Quantum Field Theory, such as Quantum Electrodynamics and Quantum Chromodynamics. There is no QFT for gravity yet. For all we know, a quantum gravity theory might not involve geometry at all; it just has to 'reduce' to the equivalent of a geometric field theory at lower energies and larger scales. ( much like GR reduces to Newtonian at even lower energies )

There are people who disagree that the Earth is spherical. Would you agree with them if I post a video of their claims ? By all means, post this video, so we can point out its shortcomings. ANYTHING involving FtL motion/communication implies causality violation. So, you just made up your own definition for 'everything in the universe' ?

Most Americans don't even realize that this case is not about bribery or 'hush' money, but unlawful use of campaign financing, and keep comparing it to B Clinton ( who's crime was perjury under oath, not for having sex with an intern )

Causality restricts ( possibly ) yravel in time. Travel in space is restricted by the speed of light. ( although since relativity joins space and time, violating the SoL effectively violates causality )

You are not able to pick and choose circumstances where there are no large scale causality violations with FtL movement or transmissions; the fact remains that if you allow one circumstance of FtL motion/transmission then they are ALL allowed, and causality is gone. IOW, allowing your example, Moon, also necessarily allows the 'grandfather' paradox or the origin of Romeo and Juliet ( my examples ).

This is more usually stated as the 'grandfather paradox', Moon, and yes it does violate causality. As usually stated, you go back in time and kill your grandfather. But then, you were never born to be able to go back in time. So your grandfather still lives, you are born , and travel back to kill him. But then you couldn't have ... This is the loop Sabine was talking about. And it doesn't necessarily involve actual travel in time either. Say you send a manuscript of Shakespeare's \\\romeo and Juliet back to William, who then publishes it, so that you, in the future, can send a copy back to him. Who actually wrote Romeo and Juliet ? What exactly 'caused' the play ?

I see. I do believe TheVat's comment which started this thread was referencing Sabine Hossenfelder's video, and her explanatiom of the effect of co-moving frames on direction of time. This effect is absent in SR. Co-moving distances and times are closely related to proper distances and times. Her argument, that communicatng with Andromeda with a FTL transmission, then having the Andromedans communicate back to you, also FTL, so you receive the communication before you sent the first, would not be possible as the second communication must also originate with you and be sent to Andromeda. Watch the video posted by Moontanman in the other thread, starting at about 16 min to 20 min for S Hossenfelder's explanation.

Let me see if I understand this correctly. There is already a causality violation and you wish to know if causality is violated ???

She makes two arguments, both based on Special Relativity. The first is that the energy required to accelerate a massive object to the speed of light is arguably not infinite. When v=c in the equation, the expression becomes singular. IOW, no longer valid Physics, just like anywhere else infinities arise. ( alsoexplains how mass is mostly binding energy, and the workings of the Higgs field ) The second, also using SR, using FTL travel, or communication, to send information elsewhere, then back to yourself in the past and violate causality, seems to disappear when GR is considered, as the co-moving frame estabilishes an entropic direction to the future and makes sending information back to your past self from elsewhere, impossible. The direction would be from your past self to elsewhere, not the other way around. I enjoy her humor, but SoL invariance ( and the reason why all observers measure the SoL to be the same, why you can't catch up to light, and why it takes increasing amounts of energy to approach the SoL barrier ) is the footing of the foundation of SR and GR. Without it much of modern Physics crumbles to the ground, nd we know that both SR and GR have been immensly successful. Maybe, as Sabine mentions, Quantum Gravity will redefine the singular points where v=c just as ( we hope ) it will for the singularity of Black Holes, leaving the rest of SR/GR unchanged.

This is just a 'warm-up', and will not result in jail time. The election overturning case in Georgia and the federal Jan 6 case are much more likely to actually land him behind bars. I hope H Clinton has her sign reading "Lock him up" ready to go.

A lot of new rifles are of 'bullpup' design, which gives a longer barrel length ( and greater muzzle velocity ) in a much more compact design. The latest innovation is caseless ammunition, which greatly reduces the weight that a combatant has to carry. I would say innovation is alive and well in the arms industry. That smart phone you have is powerful because it uses 8 ARM cores. ARM cores are licensed to Apple, Qualcomm, and many other chip suppliers based on a design from the 90s called Acorn RISC Machine and known for its frugal use of power. Different design priorities have produced different results; while 8 ARM cores can run reasonably fast all day off a small battery, they will not be able to match the raw computing power ( mflops ) of an Intel 12th gen Core, AMD Zen 3 or Nvidia 4000 series GPU.

Been busy the last couple of days with work. This is the resource I used for the Meissner effect Meissner effect for superconductors (gsu.edu) and the embedded link to the London equation Characteristic Lengths in Superconductors (gsu.edu) Haven't searched through any of the embedded links for generated forces, but you guys seem to have found solutions to the problem already. One solution is not to use ChatGPT.

I remember doing thinking, and calculations by hand ( or a slide rule ). Then computers came along in the middle 80s, and all you had to do was the thinking; computers did the calculating. I suspect that in a few years ChatGPT, or some similar AI program will also provide the 'thinking' for papers and thesis. Oh boy ! My understanding of the Meissner effect, is that, according to one of the best theoretical explanations, the London equation, the magnetic field decays exponentially inside the superconductor over a distance of 20-40 nm. It is described by a parameter called the London penetration depth, and is not really an expulsion of the magnetic field. I am not sure if the superconductor will act as a 'shield' to keep magnetic fields out of its interior, in the case of a superconducting sphere.