Constraints on the abundance of $0.01\,c$ stellar engines in the Milky Way

Abstract

Stellar engines are hypothesized megastructures that extract energy from the host star, typically with the purpose of generating thrust and accelerating the stellar system. We explore the maximum potential speeds that could be realizable by stellar engines, and determine that speeds up to ∼ 0.1 c might perhaps be attainable under optimal conditions. In contrast, natural astrophysical phenomena in the Milky Way are very unlikely to produce such speeds. Hence, astrometric surveys of hypervelocity stars may place constraints on the abundance of high-speed stellar engines in the Milky Way. In particular, Gaia DR-2 suggests that less than one in ∼ 10 7 stars is propelled by stellar engines to speeds 0.01 c.

UAP Research in Germany: Single Case Studies, Data Management, Understanding of “Strangeness”

“…Außerdem müssen selbst für weit fortgeschrittene ETs die Hauptsätze der Thermodynamik gelten (Energieerhaltung, Entropiezunahme). Daher besteht durchaus eine Chance, die Abwärme ihres Energieverbrauchs zu entdecken, wenn er stellare, interstellare oder gar galaktische Ausmaße angenommen hat (Balbi & Ćirković, 2021;Ćirković, 2006Dyson, 1960;Huston & Wright, 2022;Lingam & Loeb, 2020;Matloff, 2017;Osmanov 2018;Osmanov & Berezhiani, 2018;Wright, 2020aWright, , 2023Zackrisson et al, 2018;Zuckerman, 2022a). Dahingehend durchforstet wurden bereits Infrarotquellen-Himmelskataloge von Weltraumteleskopen wie IRAS (Infrared Astronomical Satellite), WISE (Wide-field Infrared Survey Explorer) und Spitzer, die über 100.000 Sterne und Galaxien verzeichnen (Timofeev et al, 2000;Carrigan, 2009;Wright et al, 2014;Griffith et al, 2015).…”