Recent content by SysAdmin

the part you close it without let me think what is what i want to know.now after I'm thinking,i want to ask about spin,general spin,call it mechanical if you want,in discret universe.thats is,this spin only occupy certain angle. can we assign certain number to this spin? or will no...

some guy,mentor i guess,lock my thread.the exact time of lock i forgot,so i can not tell, is my qustion will got reply or not. apparently he missunderstant my question and not giving me a chance to rephrase my question. he think I am asking in quantum,but infact my question is general. so...

Can we approach spin by gradient. For example, spin 1/2 can be written as 180 degree turning in 360 degree space while spin 2 is 720 degree turning in 360 degree space? If I have a ball spinning with angular momentum perpendicular to rotation plane, what is the spin value of the ball? Can some...

The "time stands still", is after I read the textbook. As reader it less confusing for me. I'm trying to see the OP point of view, that is why I edit the comment and add the limit notation, you know, if the limit goes to zero, than it will no surprise if you draw the blank circle in the end of...

Then pardon the analogy, It just attempt to extent the OP logic, What I'm trying to say is, particle moving at 0.9999c will see it's clock ticking slower (after it return to earth) than 0.99c. If the travel is 0.999999999999...9c it will see its clock nearly stop ticking when it return. By...

"If E1 is the emission of photon at one point in space-time, event E2 is the absorption of that photon at the same other point in space time, then the interval between them is always zero" So how to write down E1 and E2? is that still in E1=p1=(t1, x1, y1, z1) and E2=p2=(t2, x2, y2, z2) ...

if the OP want to change more perspective, let say that the galaxy is in pacman universe, if we exit from one side, we will enter from the other side. From one side, the twin will see his brother nearly stay still, while from the other side, what will he see? I think, the next photon will...

I think in OP case, the one that need to be change is the perspective. Let the twin never meet again. Each of them stay in different galaxy that moving away at nearly the speed of light. Each of them see through telescope and find out his brother (and his galaxy) nearly not moving at all. In...

I think that is the source of the confusion, null interval at four-dimensional Minkowski spacetime got translated to null interval in three dimensional ordinary space. That is, to answer the original question If (the really really if) we can attach a clock to photon, then according to photon...

Can you write more? Because in my understanding, the word experience is include interaction. That is, if an object interact with something else, than it experienced something. That is why, I ask before does Photon interact through out gravity interaction? Or it just has meaning, we should avoid...

Events "An event is a given place at a given time. Einstein, and others, suggested that we should think of space and time as a single entity called spacetime. An event is a point p in spacetime. To keep track of events we label each by four numbers: p = (t,x,y,z), where t represents the time...

People need time to think, Sir. It's Physics. You may see that I'm asking it again and again, but each expert has different way to express their understanding about relation of time and photon. Yes now I realized, when an expert say "photon don't experience time" the context of that saying...

Why must be so emotional? It's been several years since first time I see someone in documentary saying something about "photon has no time" and after that he explain no more explanation. So I came here, perhaps there an expert that have better saying in one or two paragraph. After reading some...

So, a good Ph.D in physics, if jokingly saying "Photon don't experience time" in National Geographic channel, he or she should immediately explain set of event of photon? Same thing also, it should be said that "Time don't apply to photon, but set of event does."

There is two thing in here 1. The statement it self "Why don't photons experience time?". Is the statement is true? In your reply, you give the correct statement (according to you) instead, that is "Time does not apply to photon". 2. In the link that you give, it simply saying, the event endure...