Recent content by Heidi

I remember that we wrote a 4 by matrix in a set of 4 by 4 matrix and summing for ech ons 2 values and getting what Alice density matrix has. I had a stroke in my brain 2 months ago and i still have problems. µ

Hi Pfs If Bob and Alice share a bell pair 0>0> + 1>1> I cannot remember , how Alice compute the density matrix of hes own particle. thanks.

Has my question an answswer in QFT book? Is there an equation of motion for Bell pairs? thanks

There are two levels where we have physical processes: A) When Alice interacts with her particles to in a given direction (always the same) and when Bob do the same in random directions (ans writes HIS results). B) there is another type of physical interaction if Alice sends to Bob (by internet...

A remark and a question: When there are 1400 kms betweex the two laboratories, it seems that mountains or electric fields in the middle play no role. nothing propagates between the laboratories. And the question: Coule "same direction" be defined by "always same resuts" with maximally entangles...

I foud 1200 kilometers here: https://arxiv.org/abs/1707.01339 was there measurements on random directions and analyses after?

Hi Pfs, I read that pairs of entangled particles were measured on earth along a same direction and that the distance between them was greater than 1000 kilometers. What is the définition of a "same direction" on earth? is Is it related to the direction of a very distant galaxy or somethig like...

Would it be possible that severall conservation laws could be explained by the fact that we have processes vhich do not depend on space or time? Entanglement seems to be not local. Take the the Foucault's pendulum. It oscillates in a plane that does not depend on the rotarion of the earth, the...

Hi Pfs, I would like to know if it would be possible for our known theories to derive conservation laws if space time was really granular. I think that entanglement is the only process which would succeed.

Hi Pfs, I found the formulas for the frequencies of half square triangles, and rectangles. But nothing on hexagonal drums or equilateral triangles. (it would nice to get them with Dirichlet and Neumann bordery conditions) thanks

Antony Zee describes the early universe. Structures emerged with denser regions where protons and neutrons were close together. The attractive nuclear force mediated by the spin 0 particle eventually ignites stars. What are these spin 0 oarticles. (the gluons spin is 1) ?

Another question: Are there theories with higher spin than the graviton, carrying interactions?

Does this depend on the dimension of space time? I think of the dimensions which are added in string theory.

Can we consider that it was a false start? It begins now like that: I have in my hand a book written by Antony Zee. It is Quantum field theory in a nutshell. Zee writes on page 26 of my edition : The presence of two delta function sourcs at x1 and x2 has lowered the energy. In other words the...

Sorry, I did not say where because i am not sure i could trust it: https://www.quora.com/Quantum-Field-Theory/Quantum-Field-Theory-Why-do-particles-of-odd-integer-spin-generate-forces-which-can-be-both-attractive-and-repulsive-whereas-particles-of-even-integer-spin-only-attract I think that this...