Results 91 to 100 of about 707,832 (374)
Stability of Schwarzschild singularity in non-local gravity
Physics Letters B, 2017 In a previous work, it was shown that all Ricci-flat spacetimes are exact solutions for a large class of non-local gravitational theories. Here we prove that, for a subclass of non-local theories, the Schwarzschild singularity is stable under linear ...
Gianluca Calcagni, Leonardo Modesto
doaj +1 more source
Quantum vacuum effects on the formation of black holes
Journal of High Energy Physics, 2023 We study the backreaction of quantum fields induced through the vacuum polarization and the conformal anomaly on the collapse of a thin shell of dust. It is shown that the final fate of the collapse process depends on the physical properties of the shell,
Moslem Shafiee, Yousef Bahrampour
doaj +1 more source
On Gravitational Fields in Superconductors
Frontiers in Physics, 2022 DeWitt’s theory on superconductors in gravitational fields is re-derived in the low velocity limit and linear gravity from the Klein-Gordon equation for an ensemble of charged spinless bosons. The solution has a phase singularity that gives rise to boson
Giorgio Papini
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Understanding Functional Materials at School
Advanced Functional Materials, EarlyView.This review outlines strategies for effectively teaching nanoscience in schools, focusing on challenges such as scale comprehension and curriculum integration. Emphasizing inquiry‐based learning and chemistry core concepts, it showcases hands‐on activities, digital tools, and interdisciplinary approaches.
Johannes Claußnitzer, Jürgen Paul
wiley +1 more source
A Non-singular Theory of Gravity
, 1994 We present a geometrical gravitational theory which reduces to Einstein's theory for weak gravitational potentials and which has a singularity-free analog of the Schwarzschild metric.Comment: 8 pages, RevTeX, 3 figures included in compressed form, UTPT ...
Bernstein +21 more
core +1 more source
An extreme critical space-time: echoing and black-hole perturbations [PDF]
, 2000 A homothetic, static, spherically symmetric solution to the massless Einstein- Klein-Gordon equations is described. There is a curvature singularity which is central, null, bifurcate and marginally trapped.
Ashtekar A +12 more
core +2 more sources
Advanced Functional Materials, EarlyView.Enthesis injuries are a worldwide healthcare problem. Biomimetic electrospun enthesis fascicle‐inspired scaffolds, with and without nano‐mineralization are developed. Human Mesenchymal Stromal cells (hMSCs) express the most balanced enthesis markers on the non‐mineralized scaffolds.
Alberto Sensini +11 more
wiley +1 more source
Advanced Functional Materials, EarlyView.Sustainable films with heterosymmetric structures, harmoniously integrating symmetry and asymmetry, are fabricated using cellulose nanocrystals and hydrophilic nanolignin via evaporation‐induced self‐assembly, which exhibit excellent multiple polarization optical properties.
Qun Song +7 more
wiley +1 more source
Quantum solitonic wave-packet of a meso-scopic system in singularity free gravity
Nuclear Physics B, 2018 In this paper we will discuss how to localise a quantum wave-packet due to self-gravitating meso-scopic object by taking into account gravitational self-interaction in the Schrödinger equation beyond General Relativity.
Luca Buoninfante +2 more
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Born–Infeld black holes in 4D Einstein–Gauss–Bonnet gravity
European Physical Journal C: Particles and Fields, 2020 A novel four-dimensional Einstein-Gauss-Bonnet gravity was formulated by Glavan and Lin (Phys. Rev. Lett. 124:081301, 2020), which is intended to bypass the Lovelock’s theorem and to yield a non-trivial contribution to the four-dimensional gravitational ...
Ke Yang +3 more
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