Lifeboat Foundation

In this work we propose a novel campaign for constraining relativistically compact MACHO dark matter, such as primordial black holes (PBHs), using the moon as a detector. PBHs of about $10^{19} \textrm{ g}$ to $10^{22} \textrm{ g}$ may be sufficiently abundant to have collided with the moon in the history of the solar system. We show that the crater profiles of a PBH collision differ from traditional impactors and may be detectable in high resolution lunar surface scans now available. Any candidates may serve as sites for in situ measurements to identify high pressure phases of matter which may have formed near the PBH during the encounter. While we primarily consider PBH dark matter, the discussion generalises to the entire family of MACHO candidates with relativistic compactness.

Abstract: We present new HI interferometric observations of the gas-rich ultra-diffuse galaxy AGC 114,905, which previous work, based on low-resolution data, identified as an outlier of the baryonic Tully-Fisher relation. The new observations, at a spatial resolution $\sim 2.5$ times higher than before, reveal a regular HI disc rotating at about 23 km/s. Our kinematic parameters, recovered with a robust 3D kinematic modelling fitting technique, show that the flat part of the rotation curve is reached. Intriguingly, the rotation curve can be explained almost entirely by the baryonic mass distribution alone. We show that a standard cold dark matter halo that follows the concentration-halo mass relation fails to reproduce the amplitude of the rotation curve by a large margin. Only a halo with an extremely (and arguably unfeasible) low concentration reaches agreement with the data. We also find that the rotation curve of AGC 114,905 deviates strongly from the predictions of Modified Newtonian dynamics. The inclination of the galaxy, which is measured independently from our modelling, remains the largest uncertainty in our analysis, but the associated errors are not large enough to reconcile the galaxy with the expectations of cold dark matter or Modified Newtonian dynamics.

From: Pavel Mancera-Piña [view email]

[v1] Tue, 30 Nov 2021 19:00:01 UTC (7,952 KB)

Fumarate is a terminal electron acceptor in the mammalian electron transport chain, and its reduction sustains mitochondrial functions in hypoxia.

Topological order of the toric code type is realized in two synthetic quantum systems.

Considerable variation exists in the contagiousness of yawning, and numerous studies have been conducted to investigate the proximate mechanisms involved in this response. Yet, findings within the psychological literature are mixed, with many studies conducted on relatively small and homogeneous samples. Here, we aimed to replicate and extend upon research suggesting a negative relationship between psychopathic traits and yawn contagion in community samples.

A new report from the Harvard Kennedy School found that China’s rapidly gaining steam in the realms of AI, 5G, quantum computing, biotechnology, and more.

Researchers have created jellyfish whose nerve cells light up when they fire, offering a tantalizing view of neurology before the rise of the brain.

But there should be a system in metaverse where users can operate machines using internet.

Following an initial announcement eight months ago, Meta has released its latest avatar system for all Unity VR developers, including support for App Lab titles and limited support for non-Oculus platforms like SteamVR.

Update (December 13th, 2021): Meta today announced that its latest avatar system is finally available to all Unity developers. Formerly called Oculus Avatars 2.0—and now called Meta Avatars—the system brings a huge upgrade to avatar style and expressiveness compared to the company’s prior avatar systems.

Continue reading “Meta’s Latest Avatar System is Finally Available to Unity VR Developers” »

Global Times, controlled by the government, announced on December 12, that China has “significantly” increased the serial production of the J-20 stealth fighter.

BEIJING, ($1=6.36 Chinese Yuans) – The information website Global Times, controlled by the Chinese government, announced yesterday, December 12, that China has “significantly” increased the serial production of the J-20 stealth fighter, learned BulgarianMilitary.com.

“The transition to imported WS-10 engines has made mass production possible,” said Fu Qiangshao, a Chinese military aviation expert, noting that other J-20 systems, including the avionics system, radar system, and weapons systems, have already been developed. in the country.

Continue reading “China begins mass production of J-20 fighters because of the WS-10 engine” »