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On the quantitative isoperimetric inequality in the plane with the barycentric distance
In this paper we study the following quantitative isoperimetric inequality in
the plane: where is the
isoperimetric deficit and is the barycentric asymmetry. Our aim is
to generalize some results obtained by B. Fuglede in \cite{Fu93Geometriae}. For
that purpose, we consider the shape optimization problem: minimize the ratio
in the class of compact connected sets and
in the class of convex sets
A semilinear problem with a W^{1,1}_0 solution
We study a degenerate elliptic equation, proving the existence of a W^{1,1}_0
distributional solution
Galactic Calibration of the Tip of the Red Giant Branch
Indications from Gaia data release 2 (DR2) are that the tip of the red giant
branch (TRGB, a population II standard candle related to the helium flash in
low mass stars) is close to -4 in absolute I magnitude in the Cousins
photometric system. Our sample is high latitude southern stars from the thick
disk and inner halo, and our result is consistent with longstanding findings
from globular clusters, whose distances were calibrated with RR Lyrae stars. As
the Gaia mission proceeds, there is every reason to think an accurate Galactic
geometric calibration of TRGB will be a significant outcome.Comment: to appear in PAS
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