Parameter free Hubble constant from the quadruply lensed quasar SDSS J1004 + 4112

J. Martínez-Arrizabalaga, J. M. Diego, L. J. Goicoechea

We present a free-form lens model for the multiply lensed quasar in the galaxy cluster SDSS J$1004+4112$. Our lens model makes minimal assumptions about the distribution of mass in…