MigL

Light cones are part of space-time diagrams and can't be moved as you please. There are certain rules they follow. Assuming the proper scale on your axis, the space-time diagram will have the speed of light at a diagonal 45o angle. Anything following that line is called 'time-like' and is moving at c . Anything moving more horizontally means that space is being traversed faster than c ( an impossibility ) and is termed 'space-like'. What we usually experience is motion more vertical, which means space is being traversed slower than c , and termed 'time-like'. How, exactly, are you moving your two light cones ? ( maybe understanding this will clear up your misconceptions Spacetime diagram - Wikipedia )

Interesting; did not know any of that. Thanks @toucana

Does that view extend to Quantum Mechanics ? Do you believe 'reality' is a probabilistic mathematical superposition of states until an observation/interaction collapses that 'reality' to a particle ? or do you believe in an underlying actual reality with non-local characteristics ? While I have no problem with no local reality for quantum effects, I cannot male the jump to considering space-time as 'something' that can be curved, stretched, compressed, or even cut like a fabric.

I see his school work has moved to Thermodynamics, after Chemical Bonding. Show us YOUR thinking/reasoning so far. ( hint; look at the effect of differing T, when the same amount of heat, Q, is added, in your equation for change in entropy, S )

In everyday experience, the effects of relativity are trivial to non-existent. I would have thought you'd know that after all these years. Go back, think about it, and come back with some good questions.

Except when you say 'implies' it could also imply that it acts like it is curved ( mathematically ) without necessarily being so, as space-time is not a thing, but a mathematical construct. It ( curvature ) cannot be measured directly; other effects are needed to 'imply' curvature. Remember that what we consider 'things' are three dimensional, and to join time to the three spatial dimensions into combined space-time, requires the time dimension to be orthogonal and therefore imaginary ( i ). But as I said, your view of 'reality' might be different from mine, and while I can't falsify yours, you cannot falsify mine ✌ .

Yes. At the Event Horizon the space-time curvature is such that no geodesics, or trajectories, lead outside the Event Horizon., not even for light. It is curved in a way that all paths lead to the future collision with the center of the Black Hole ( whatever that may be ). A neutron star isn't massive enough and its constituent neutrons can resist further gravitational collapse due to neutron degeneracy pressure.

A bit like wave/particle duality; is light a wave or a particle ? Well, it depends on the experiment used to detect it ( ie, measure it ). Could be both; could be neither. Because we're not actually measuring it; we measure how it acts on other things.

You can measure how light bends around massive objects, Shapiro delay, gravitational lensing or interference fringes due to gravitational waves ( LIGO ). You can measure how gravitational time dilation modifies clocks ( any type, even light frequency ). You can measure the trajectory along geodesics of massive objects in free fall. The bolded words are what is actually being measured. The left hand side of the EFEs represent the geometry of space-time, and g , the metric tensor is the tangent space connector ( affine ). This is not an actual measurement, but a mathematical construct to aid calculations. I would say we have different definitions of 'real'. ( I hope you don't also believe space-time has a 'fabric' 🙂 )

NO The particle over there doesn't know that you shook the particle over here, until the 'information' gets to it, and that information has a maximum speed, c . And you'd be wrong. Again.

You cannot put a measuring tape to space-time and measure the deviation from flat, but you can measure the effects of curved space-time on bodies, or phenomena, within it. Similarly, I can measure the effects of a Phonon in a crystal lattice. Should I take a Phonon as a 'real' particle ? Or should I consider it a mathematical construct that aids calculation ? We do not see 'reality', only its effects.

That was sarcasm, as I don't believe in imaginary beings that can observe the universe from 'outside'. Any observation you can make, I can give another which differs in time and location, because it is made from a different frame. And it, and all others, will be just as valid. If you want to use that 'excuse' for your failure to comprehend relativity, that's fine. The rest of us don't have that problem.

And the 'curvature at the singularity of a Black Hole is infinite. Which means that the equations which describe the singularity and the concept of curvature cannot be applied in that domain. Mostly because it is a 'made up' concept, and while you can measure 'effects' because reality acts ( for the most part ) like it is curved, the 'concept is not applicable in some extreme situations.

Yes, it may happen only once, but the relationship with the rest of the universe differs with the frames of reference of different observers in the universe. There is no absolute frame of reference, observer, or 'now'. If you won't believe me, ask the only absolute observer that I know of, God; let me know what He tells you.

As per our PMs Every different observer carries their own different perspective, shaped by different, and unique, trajectories through space-time; it is a tenet of Relativity.

Yes, the space-time of the model acts exactly like the reality ( in most situations ) and has been confirmed to a very high degree. In the model space-time can be curved and is malleable; whether reality is also, is a question for Philosophers to debate.

No it would not. Information, even mechanical, is limited by the speed of light. Is there something you wish to ask, before stating absurdities ?

The old forum software used to send Email notifications to my phone when someone on SFn had sent me a PM. The new software doesn't seem to do this anymore. Is that feature not supported, or can it somehow, be turned on in the settings ?

We are not big fans of the current state of AI on this forum. It is fine for people who want regurgitated, and often wrong, knowledge, albeit drawn from vast sources, but in terms of 'learning', AI isn't even at the level of a month old baby, or a dog for that matter. Quantum computing is in the same boat as Fusion reactors. For 40 years a breakthrough has been just around the corner. Except we have a working example of a Fusion reactor 93 000 000 miles away, so we know it works. Not so sure about Quantum computing. Changing games ? mRNA research changed ( and saved ) lives.

Don't worry so much about Bond villains, but a low flying EA-6B, piloted by 'hot-dogging' American pilots from an |Italian Air Force base, has been know to slice through the supporting cables. 1998 Cavalese cable car crash - Wikipedia

A lot of people start off with the 'pulpy' science fiction of the 40/50s ( E E 'Doc' Smith type ) before moving on to the 'deeper' science fiction which is more social commentary in a sci-fi setting. I started my 'journey' with Galactic Derelict, by Andre Norton ( actually a cat lady ) before she veered off into fantasy while I wanted more science realism of the Dragon's Egg, by Robert L Forward type. Maybe if you indicate what type interests you, we might be able to recommend what you'd like, not what we like.

Does anyone actually look for the +/- markings , or color end coding ? I, like most people, differentiate the positive end by the raised terminal, as opposed to the flat negative end.

"A Feynman diagram is a graphical representation of a perturbative contribution to the transition amplitude or correlation function of a quantum mechanical or statistical field theory. Within the canonical formulation of quantum field theory, a Feynman diagram represents a term in the Wick's expansion of the perturbative S-matrix. Alternatively, the path integral formulation of quantum field theory represents the transition amplitude as a weighted sum of all possible histories of the system from the initial to the final state, in terms of either particles or fields. The transition amplitude is then given as the matrix element of the S-matrix between the initial and final states of the quantum system." Drom Feynman diagram - Wikipedia If you think I scolded you because I can do the path integrals QFT requires, you are mistaken; I use Feynman diagrams because they make life ( and understanding ) so much easier. IOW, I'm giving advice, not chasing you away; you have always been welcome to stay and learn.

Again You might educate yourself on Feynman diagrams before making blanket statements like the above. The fact that in the model, you can consider anti-particles as travelling backwards in time to make calculations easier, has no implications on the real. The fact that you don't understand something should lead you to ask questions, not assert unwarranted conclusions.

Actual Physicist ?? Anti-deSitter space refers to the intrinsic curvature of space-time, absent matter and due to the energy density of the vacuum ( Cosmological Constant ? ), having the opposite sign of deSitter space, hence having hyperbolic curvature and negative Cosmological Constant. I have never read or heard the term anti-time, and would not know what it means. Although in Feynman diagrams, anti-particles can be treated as particles travelling backwards in time.