Simple-dynamics conjectures for Newton maps of real polynomial maps

Let f:R2R2f:\mathbb{R}^2\to\mathbb{R}^2 be a polynomial map of degree n3n\geq3 with nn distinct real roots {ci}\{c_i\}. Let NfN_f be its Newton map, JNfJ_{N_f} its Julia set, FNfF_{N_f} its Fatou set, and FNf(ci)\mathcal{F}_{N_f}(c_i) the basin of attraction of cic_i.

Simple-dynamics conjectures. The following properties hold:

  1. JNfJ_{N_f} is the countable union of wedge sums of a countable number of circles and of Cantor sets of circles of measure zero.
  2. FNfF_{N_f} has no wandering domains.
  3. The union of the basins of attraction FNf(ci)\mathcal{F}_{N_f}(c_i) has full Lebesgue measure.
  4. Every neighborhood of any point of JNfJ_{N_f} contains points from at least two distinct basins of attraction.
  5. Unlike the holomorphic case:
  6. basins of attraction are not necessarily simply connected;
  7. immediate basins of attraction are not necessarily unbounded;
  8. JNfJ_{N_f} can have interior points without being equal to the whole RP2\mathbb{R}\mathrm{P}^2.

These are proposed as two-dimensional analogues of Barna's theorem and related one-dimensional results for real Newton maps. The supplied parser gives no evidence that these claims have been resolved.

Sources & referencesView supporting material

Primary source

Roberto De Leo, “Julia sets of Newton maps of real quadratic polynomial maps on the plane”, arXiv:1812.11595 (2019).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.