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Abbiamo scoperto una nuova particella, ma non dovrebbe esistere

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Si tratta di una particella anomala, dato che a differenza degli altri neutrini non interagisce in alcun modo con la materia. Individuato al Fermilab di Chicago, potrebbe rimettere in discussione alcune parti del Modello Standard 



Al Fermilab di Chicago appare una nuova particella che non sarebbe dovuta esistere: l’esperimento MiniBooNe ha individuato una prova di un nuovo neutrino, definito sterile, dato che non interagisce per niente con la materia, a differenza dei suoi cugini. I risultati sono descritti in preprint su ArXiv. Ecco cos’è e perché secondo alcuni scienziati non era prevista.
I neutrini attualmente noti e osservati negli esperimenti sono detti attivi e possono essere di tre tipi (in fisica chiamati sapori, ciascuno definito da una particolare simmetria della particella): il neutrino elettronico, muonico e tauonico. Nel tempo, un neutrino può passare da un tipo ad un altro e queste oscillazioni sono importanti per capire come funziona la materia nella sua composizione in…

Why Earth’s Cracked Crust May Be Essential for Life

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From a distance, it's not obvious that Earth is full of life. You have to get pretty close to see the biggest forests, and closer still to see the work of humans, let alone microbes. But even from space, the planet itself seems alive. Its landmass is broken apart into seven continents, which are separated by vast waters. Below those oceans, in the unseen depths of our planet, things are even livelier. The Earth is chewing itself up, melting itself down, and making itself anew.



A dozen cold, rigid plates slowly slip and slide atop Earth's hot inner mantle, diving beneath one another and occasionally colliding. This process of plate tectonics is one of Earth's defining characteristics. Humans mostly experience it through earthquakes and, more rarely, volcanoes. The lava currently spurting from backyards in Hawaii — a result of a deep-mantle hot spot — is related to tectonic activity.

But there's more to plate tectonics than earthquakes and eruptions. A wave of new resea…

A “weird” introduction to Deep Learning

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There are amazing introductions, courses and blog posts on Deep Learning. But this is a different kind of introduction.



But why weird? Maybe because it won’t follow the “normal” structure of a Deep Learning post, where you start with the math, then go into the papers, the implementation and then to applications.

It will be more close to the post I did before about “My journey into Deep Learning”, I think telling a story can be much more helpful than just throwing information and formulas everywhere. So let’s begin.

https://towardsdatascience.com/a-weird-introduction-to-deep-learning-7828803693b0

Hundreds of Mysterious Stone ‘Gates’ Found in Saudi Arabia’s Desert

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Using Google Earth, an archaeologist has identified nearly 400 stone structures called “gates” in Saudi Arabia. They may have been built by ancient nomadic tribes.CreditSatellite photo by CNES/Airbus, via Google Earth
By Nicholas St. Fleur
Google Earth has unlocked the gates to ancient mysteries around the world.

For years, amateur and professional archaeologists have used the search engine’s satellite imagery to discover mysterious earthworks in Kazakhstan, Roman ruins, a forgotten fortress in Afghanistan and more. In the past decade, Google Earth also has helped identify thousands of burial sites and other “works of the old men,” as they’re called, scattered across Saudi Arabia.
Now, archaeologists have uncovered nearly 400 previously undocumented stone structures they call “gates” in the Arabian desert that they believe may have been built by nomadic tribes thousands of years ago.
“We tend to think of Saudi Arabia as desert, but in practice there’s a huge archaeological treasure trove o…

Ten Mesmerizing Geophysical Maps That Double as Works of Art

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From tiny seafloor features in the Gulf of Mexico to craters pocking the surface of Mars, the details on these maps captivate and fascinate.


A snippet of a new billion-pixel map of the Gulf of Mexico shows salt domes and minibasins. Credit: BOEM

They say a picture is worth a thousand words. For Earth and space scientists, a certain class of images is worth much, much more.
These images are maps. They can slice across time and space, overlaying information on never-before-seen features or changing landscapes. They can even highlight how humans change those same landscapes. Maps are central to our sciences; without them, we’re just playing in the dirt.
This Earth Science Week, we took a look back at the many breathtaking maps highlighted in Eos and in American Geophysical Union blogs. These maps represent hundreds of hours of work by scientists and engineers. And many are fascinating works of art in their own right—we could spend hours poring over their fine details, patterns, and colors…

Un nuovo stato della materia creato con l'entanglement quantistico

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Utilizzando impulsi di luce, un nuovo studio è riuscito a stabilire la correlazione quantistica che Albert Einstein chiamava “azione fantasmatica a distanza” tra mezzo milione di atomi di rubidio, mantenuti a 20 milionesimi di grado sopra lo zero assoluto. Si tratta di un primato assoluto per gli esperimenti di questo tipo, anche se i ricercatori non sanno dire perché si sia prodotto l'effetto. di Clara Moskowitz

Un gruppo di fisici ha utilizzato la correlazione quantistica che Albert Einstein chiamava “azione fantasmatica a distanza” per collegare 500.000 atomi in modo che il loro destino fosse strettamente interconnesso. Gli atomi erano legati dall'entanglement, il che significa che un'azione compiuta su un atomo si riverbera su ogni atomo entangled con esso, anche se si trova molto lontano. L'enorme nuvola di atomi entangled è il primo “singoletto di spin macroscopico”, un nuovo stato della materia, finora previsto per via teorica ma mai realizzato praticamente.
L&#…