Handling Lattice Parameters

In lattice calculations we are always analyzing configurations, which depends on \(m_l\), \(m_s\), \(\beta\), \(N_\sigma\), and \(N_\tau\). Usually the parameter combination is succinctly incorporated into the parameter name as, e.g. l328f21b6390m00257m0694.

Lattice parameters

The latticeParams class

import latqcdtools.physics.lattice_params

collects all this information into one object, and contains some useful methods, for example the ability to convert one of these parameter strings into its corresponding float value. To instantiate this object, use

lp = latticeParams(Ns, Nt, beta, mass_l='', mass_s='',scaleType='fk', paramYear=2021, Nf='21')

Here beta and the quark masses are input strings coming from l328f21b6390m00257m0694. You can then, for instance get the float value corresponding to the string 6390 using

lp.getBeta()

The scaleType argument lets you choose what reference scale to use. How these scales vary in lattice units as a function of \(\beta\) has been calculated by the HotQCD collaboration; the paramYear option lets you pick the year this function was computed. You can specify the number of flavors with Nf.

There is also a method to get the l328f21b6390m00257m0694 string, getcparams. You can also get the lattice spacing in [fm] and temperature in [MeV] using geta and getT, respectively. Finally paramSummary() prints a nice summary of all parameters going into your calculation to the screen.