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Fermi

Gargantuan 'Fermi bubbles' are the result of a 100,000-year-long black hole explosion, study suggests

Two of the strangest, most colossal structures in the Milky Way may have formed in a 100,000-year-long explosion at our galaxy's center, new research suggests. Those structures — named the Fermi bubbles and eROSITA bubbles after the respective telescopes that discovered them — straddle the Milky Way's center in an enormous hourglass shape, with one set of bubbles stretching more than 25,000 light-years above the galactic plane, and the other set stretching just as far below it.
ASTRONOMY
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Nature.com

Electronic screening using a virtual Thomas"“Fermi fluid for predicting wetting and phase transitions of ionic liquids at metal surfaces

Of relevance to energy storage, electrochemistry and catalysis, ionic and dipolar liquids display unexpected behaviours-especially in confinement. Beyond adsorption, over-screening and crowding effects, experiments have highlighted novel phenomena, such as unconventional screening and the impact of the electronic nature-metallic versus insulating-of the confining surface. Such behaviours, which challenge existing frameworks, highlight the need for tools to fully embrace the properties of confined liquids. Here we introduce a novel approach that involves electronic screening while capturing molecular aspects of interfacial fluids. Although available strategies consider perfect metal or insulator surfaces, we build on the Thomas"“Fermi formalism to develop an effective approach that deals with any imperfect metal between these asymptotes. Our approach describes electrostatic interactions within the metal through a 'virtual' Thomas"“Fermi fluid of charged particles, whose Debye length sets the screening length λ. We show that this method captures the electrostatic interaction decay and electrochemical behaviour on varying λ. By applying this strategy to an ionic liquid, we unveil a wetting transition on switching from insulating to metallic conditions.
CHEMISTRY
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Is dark matter made of 'Fermi balls' forged in the Big Bang?

Dark matter — the mysterious substance that exerts gravity but doesn't interact with light — might be made of tiny black holes permeating the universe. And according to a new theory, those black holes might have been made from Fermi balls, or quantum "bags" of subatomic particles known as fermions that got smooshed together in dense pockets during the universe's infancy.
ASTRONOMY

Is dark matter made of 'Fermi balls' forged in the Big Bang?

Dark matter — the mysterious substance that exerts gravity but doesn't interact with light — might be made of tiny black holes permeating the universe. And according to a new theory, those black holes might have been made from Fermi balls, or quantum "bags" of subatomic particles known as fermions that got smooshed together in dense pockets during the universe's infancy.
ASTRONOMY
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wrti.org

Classical Album of the Week: Fermi's Paradox

July 5, 2021. How do you solve a 21st-century problem with 17th-century instruments? Lutenist Ronn McFarlane and viola da gamba player Carolyn Surrick answer that question in their latest album, Fermi’s Paradox, which was conceived, performed, produced and released in 2020, during the pandemic. Like all performers around the world,...
MUSIC
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