Recent content by pythagoras88

oh, ok... haha... i guess it is a trivial question. So it is juest an accelerating particle that does not affect the spacetime. Initially i was thinking, because an accelerating observer will have an rindler horizon given by x=t and x=-t. Then is it possible that the energy used to accelerate...

Hi, I read sean carroll book, "spacetime and geometry" and in the last chapter where he tries to derive unruh effect, he introduced the concept of Rindler coordinate. There is this part where he considers an accelerating observer in minkowski metric and introduce the trajectory blah blah...

Thanks for the reply. Do you know of any reference that has the proof for extending every set to a maximal set? Or is this kind of like a trivial fact that does not require much proving?

Hi, Just wondering, can we prove that there is a maximal complete set of commuting observable?

Hi, I've recently finished a course on GR, and would like to read up more on wormhole and white hole. May I ask if there are any papers, websites or books that introduces the mathematical and physical structure of these stuffs?

I see... thanks for the explanation. I will go and do some read up on this!

Sorry, but why does quantum mechanics need a non-commutative geometry? Is it because it is dealing complex space?

Hi, Is radiation a frame variant process, which means for example, if someone is co-accelerating with an accelerating charge(such that no relative motion) then he will not witness radiation since to him, since the charge is stationary. However, to an inertial observer outside, he will...

He quoted a physicist(i guess) from princeton that says that gravity is illusion, so i guess he kind of agree with him. Is this stance still debatable?

Hi, Today in a classical mechanics lecture, we were posed a question on whether there will be gravitational attraction between masses if the 2 masses were squashed into a 2D masses(so is flat). At first, i thought the force should still exist, since the force only depends on masses, so maybe...

Hi, For the scenario of wire or capacitor, the poynting vector is found to point inward radially, which suggests the energy is flowing into the wire from the air. Isn't this a bit peculiar because energy seems to be transferred from the battery along the wire. What i am speculating is the...

Now let's say the wire is shaped into a square loop with the center coinciding with the center of the changing B field(again, B field perpendicular to square).Taking circular amperian loop with radius s from the center of the magnetic field, the Induced E field can be found to be E=-s/2...

Does a straight wire in changing B field(the field is perpendicular to the wire) has an induced emf?

hi guys, just to share some stuffs. I am a physics major in an asian country, and the very reason i choose to major physics is purely out of interest. Theoretical physics is just way too cool... But again, i feel that there is a price to pay for this interest and is a pretty heavy one. In my...

hmmm... regarding scholarship i am afraid i can't give you much information, because i never really do any research on that and i don't have much interest in applied physics. But well, you can take things a step at a time, try to settle your undergrad coursse first and in the midst of it decide...