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Formation of multiple Black Holes from Cauchy data
Dawei Shen, Jingbo Wan
https://arxiv.org/abs/2506.16117 https://arxiv.org/pdf/2506…

Formation of multiple Black Holes from Cauchy data
We construct a family of asymptotically flat Cauchy initial data for the Einstein vacuum equations that contain no trapped surfaces, yet whose future development admits multiple causally independent trapped surfaces. Assuming the weak cosmic censorship conjecture, this implies the formation of multiple black holes in finite time. The initial data are obtained by surgically modifying a vacuum geometrostatic manifold equipped with the Brill-Lindquist metric: the data agree exactly with the Brill-…

Development and in vitro Characterization of a Novel Bioactive Hydrogel for Bioprinting Uterine Constructs
Abbas Fazel Anvari Yazdi, Kobra Tahermanesh, Maryam Ejlali, Louison Blivet-Bailly, Vatsala Singh, Bishnu Acharya, Daniel J. MacPhee, Ildiko Badea, Xiong-biao Chen
https://arxiv.org/abs/2506.15857

Development and in vitro Characterization of a Novel Bioactive Hydrogel for Bioprinting Uterine Constructs
Background and Aim: Decellularized uterine extracellular matrix (dUECM) offers a promising bioactive scaffold for uterine tissue engineering, but its application in 3D constructs has been limited by fabrication challenges. This study aimed to develop a printable, bioactive hydrogel from dUECM suitable for 3D bioprinting and to evaluate its ability to support human uterine myometrial cell growth in vitro. Materials and Methods: Porcine uterine tissues were decellularized using 1 percent Triton…