Recent content by MaverickMenzies

Hi folks, can anyone suggest a good and current reference text on nuclear reactor theory and physics? I'm a theorist, so mathematically sophisticated presentation is welcome. Thanks in advance for any recommendations.

When I've encountered super-selection rules (SSR) in the past (in the context of quantum mechanics) they have been presented as violations of the superposition principle. Thus, it requires picking a preferred set of commutating self-adjoint operators and declaring only these are observables for...

It is possible to provide a lorentz covariant description of quantum state description. For example, see chapter 11 of "The theory of open quantum systems" by H. P. Breuer and F. Petruccione (2006).

How so? The MWI requires that the axioms of quantum mechanics be taken as fundamental - we live in quantum universe and everything has a fundamental quantum description. In contrast, (as I understand it) the CI splits reality into classical and quantum systems and doesn't advance the view of...

Hi, does anyone know whether any of the current approaches to Quantum Gravity shed any light on the measurement problem in quantum mechanics? Moreover have there been any attempts to consider the implications of the measurement problem from within either the string theory approach or the quantum...

In my experience, (in quantum optics) using the fock (i.e. eigenstates of the simple harmonic oscillator) basis to solve the SE can be messy depending on the Hamiltonian. For example, a beam splitter transforms fock states in a complicated manner, but its action on quadrature eigenstates...

You can find some operators that are simple tensor products of local operators, however, in general any operator acting on the composite space can be decomposed as a linear combination of products of dyad operators. To see this use the completeness relation (i.e. that the sum of projection...

Interesting. Thank you for your answer.

I have another (probably pointless) question concerning MWI. In the case of a pure entangled state between our quantum system and observer, MWI provides an interpretation for |spin-up> |a> + |spin-down>|b>, in that each term of the superposition should be treated as a separate copy of...

I was wondering if I could interrupt this discussion with a question about MWI? According to MWI everything is quantum and has as associated state space and that "measurements" are just entangling unitary operations between systems (one of which will be the system of interest and the other...

If this is the case, then I would suggest reading this: http://arxiv.org/abs/gr-qc/0611006

Bananan, is this interpretation of general relativity connected to the Whitehead theory of gravitation?

The physical interpretation of this result is that if you can simultaneously diagonalise two matrices then the corresponding operators (if the matrices in question are Hermitian) are compatiable. This means that they commute since it is possible to find a commom eigenvector basis for both of the...

Does anyone know of any work done that tries to connect nonlocality with locality. For example, has anyone started by accepting a nonlocal microphysics (i.e. orthodox QM) and derived from it a local theory or even the other way round? This (to me) seems a more interesting question than the...

I don't see how. The BHC formula states that: e^{\hat{A} + \hat{B}} = e^{- [ \hat{A}, \hat{B} ]/2} e^{\hat{A}} e^{\hat{B}} when [\hat{A},[\hat{A},\hat{B}]] = [\hat{B},[\hat{A},\hat{B}]] i.e. it refers to the sum of operators in an expotential. I want to decompose a product of...