Jerzy Lewandowski is a journalist who writes for TS2 SPACE, covering a wide range of topics including technology, renewable energy, and consumer electronics. With a focus on providing informative and engaging content, Jerzy brings readers the latest news and updates in the tech industry.
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Jerzy Lewandowski's articles primarily focus on technology, including smartphones, renewable energy, artificial intelligence, and space exploration. His coverage attributes show a significant emphasis on industry-specific content and press releases.
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By: Jerzy Lewandowski
Revolutionizing Electric Energy Storage: Pulsed Charging for Longer-Lasting Lithium-Ion Batteries yTech
The Quantum Leap in Optimization: Advancing the Annealing Approach yTech
By: Jerzy Lewandowski
Emerging Battery Tech Firm Charges Forward with Soaring Profits and Expansion Plans yTech
Starlink Internet Service to Halt in South Africa Over Terms Violation yTech
By: Jerzy Lewandowski
Explore the Universe at the Esteemed 2024 Northeast Astronomy Forum & Space Expo yTech
Expanding Japan's Role in Global Defense Supply Chain yTech
Remarkable Escape for Family as Space Station Debris Crashes Through Roof yTech
Navigating Online Privacy: Understanding Cookie Settings and Terms of Use yTech
By: Jerzy Lewandowski, Maciej Ossowski
We consider isolated horizons (Killing horizons up to the second order) whose null flow has the structure of a U(1) principal fiber bundle over a compact Riemann surface. We impose the vacuum Einstein equations (with the cosmological constant) and the condition that the spacetime Weyl tensor is of Petrov D type on the geometry of the horizons. We derive all the solutions in the case when the genus of the surface is. By doing so for all the nontrivial bundles, we complete the classification. We construct the embedding spacetimes and show that they are locally isometric to the toroidal or hyperbolic generalization of the Taub-NUT-(anti-) de Sitter spacetimes for horizons of genus 1 or respectively, after performing Misner’s identification of the spacetime. The horizon bundle structure can be naturally extended to bundle structure defined on the entire spacetime.
By: Luca Cafaro, Jerzy Lewandowski
The collapse of a spherically symmetric ball of dust has been intensively studied in loop quantum gravity (LQG). From a quantum theory, it is possible to recover a semiclassical regime through a polymerization procedure. In this setting, general solutions to the polymerized Einstein field equations (PEFE) will be discussed both for the homogeneous interior and the exterior of the dust cloud. Exterior solutions are particularly interesting since they may lead to a semiclassical version of the Birkhoff’s theorem. It is seen that if time independence of the vacuum is imposed, there exists a class of solutions depending on two parameters. Nevertheless, the possibility of more intricate time-dependent solutions is not ruled out completely. A second approach to study semiclassical spacetimes is by considering an Oppenheimer-Snyder model. Namely, one glues the portion of spacetime containing homogeneous dust with the vacuum part by matching the extrinsic curvatures. In this way, one gets a metric tensor for the vacuum, which can be compared to the one obtained previously. Although these two methods are completely independent from each other, the results we obtained are in perfect agreement.
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