Recent content by Raghnar

Because for example in a superfluid there is no exchange of momentum since the time-reversal symmetry restoration. What are the shortcoming and assumption in the definition of pressure? How can something that does not exchange momentum change the momentum (and density) of its lower layers?

There are 4 fundamental forces in Nature. Gravitational: that everyone knows well but have (almost) nothing to do in acting directly with the atoms. Weak and Strong nuclear force. Electromagnetic force (that is not just Coulomb! but Coulomb + Lorentz + ElectroDynamical effects + Quantum...

That I know (I wrote it up), but the neutron superfluid composing the inner crust of a neutron star is definately not a perfect gas (and there is no transfer impulse by impact inside that medium!). And still is described as "originated by the pressure of the outer layer" and "acting on the lower...

Hallo! Ok, I know the textbook and I actually have too many degrees in "RFM"... But still I have some doubts regarding the nature of pressure, and its limit of applicability. So Pressure is a Thermodynamical intensive quantity, thus statistically defined. That teaches us the Barometric law and...

I have a twist for politics, and I wanted to explore some numerical simulations to compare government types and effectiveness in the use of available resources. I thinked about agent-base simulation, and later found (on Wikipedia) that this type of simulation is fairly common in treating...

Supernova Remnants like Neutron stars and maybe black holes have the most kinet energies. Since Neutron stars are not that massive (2 solar masses is the upper limit) they can have very high velocities. If you're looking for huge Velocities Neutron stars can have up to 1000 km/s (whatch out...

I think this: http://www.springer.com/astronomy/astrophysics+and+astroparticles/book/978-0-387-33543-8 Is a good book about the subject.

In a quantum environment classical e-m is an insufficient description, like e.g. in atomic spectrum you need QED to describe hyperfine splitting. If an object is a quantum object, it display general coherence of properties and quantum properties. It all behaves following a global wavefunction...

You need weak force driven nuclear fusion, since the start of the nuclear reactions inside a star are p+p fusing into a deuteron (so a proton goes into a neutron + antielectron + neutrino). The gravitational pressure you will need must have temperature of the order of the energy difference of...

Neutron stars structure is highly composite, in fact for the core of pulsars like magnetars is yet more or less unknown. Neutron stars have an atmosphere of almost electron and plasma gas (sometimes liquid), that even if few cm thick can generate great magnetic field, having plasmon resonances...

Dear all, I'm starting to study neutron star accretion and a lot of physical phoenomena coming from different scales come along and a consistent picture is frankly hard to grasp. But for now, a real mind boggling question can't exit my mind. Are Neutron stars, as a whole Quantum, or...

That was the problem, thank you! :)

I will try to reproduce the program in a short version, seeing if the problem is still there... The one which I use is far too complicated

There are some caveat in fortran 77 while calling functions inside subroutines? I have some weird errors while calling a function inside a subroutine, e.g. Segmentation Fault while using/writing the argument of the function (but not sooner, I can still do an "Hallo World"!) or starting a do...

I've spent the morning checking for sparse matrix diagonalization codes, and came up with almost nothing :( Maybe MATLAB will work, but I don't know it... Anyway Maybe I can use Lanczos on a Dense Matrix representation and will work just fine.