Recent content by Tabatta

Thank you for the "fortran" tag, and I feel kind of silly for not having noticing the error in the coefficients. I changed them in my code (I switched the 3rd (h/12) and the 4th (h/6)). The result is 'improved', the damping is much slower, but it still exists while it doesn't if I use uh...

Hello, I'm recently trying to code a solver for a system of differential equations u'(t) = F(t,u), using a Runge Kutta 4 method with an adaptative stepsize. For this, I'm using the 'step doubling' method, which is the following : suppose that we now the solution u(i) at time t(i). Then, the...

Thanks, I finally managed to get the first equation of 21 and then I realized that the two other ones just come from this one ... Thanks again :smile: !

Hi all, I'm currently studying pair production by two photons (a high-energy one traveling in a isotropic field of low-energy ones), and I'm trying to understand the energy range of the electron created by this phenomenon. For this, I'm studying an old paper from Aharonian 1983...