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#physics

101 posts87 participants11 posts today
Nicole Sharp

A Sandy Spine

Where sea and sand meet, Gaia’s spine rises. Photographer Satheesh Nair captured this striking image in western Australia, where wind and wave action have dragged a dune into vertebrae-like cusps. Notice how the size and shape of the curves differs between the under- and above-water sections. Those differences reflect the differing forces that shape them — just water for one set, water and air for the other. (Image credit: S. Nair/IAPOTY; via Colossal)

#beachCusps#fluidDynamics#fluidsAsArt
John A. Mulhall

From Star Trek’s antimatter dreams to CERN’s latest breakthrough, the line between sci-fi and reality is blurring.

🚀 Could antimatter qubits transform quantum computing? And will scarce antimatter remain the biggest barrier?

🔗 authormulhall.com/antimatter-q

Author Mulhall 📚 · Antimatter Qubits: CERN's Leap Into Quantum FutureCan CERN’s antimatter qubit redefine quantum tech? A quantum leap in physics reveals new paths for exporation and quantum computing.
#Physics#Antimatter#Quantum
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CCochard

Question for people smarter than me.

They mention that you can't have long-range 2D solids which kind of goes against my vision of graphene, h-BN, etc. which are crystalline over a "reasonable" long-range (few microns). How is this possible?

Mike Glazer always says 2D structures don't exist as you always have the thickness of the atoms. Is this the reason?
(yes, that Glazer and yes, name dropping)

#physics#crystallography
CCochard

The 1972 and 1973 papers by Kosterlitz and Thouless 🔥🔥🔥

"Long range order and metastability in two dimensional solids and superfluids" (J. Phys. C, 1972) is 4-pages and incredibly "easy" and explain the logic on a specific case.
The idea is further generalised to many different cases in "Ordering, metastability and phase transitions in two-dimensional systems" (J. Phys. C, 1973) is much longer and a lot more involved but it's incredible to see the similarity between some of the physics that are completely distinct in my head

No wonder they got the Nobel prize for it: theconversation.com/odd-states

(yes, I know they don't need my opinion, but it is blowing my mind 🤯)
#physics #topology

The ConversationOdd states of matter: how three British theorists scooped the 2016 Nobel Prize for Physics
More from The Conversation UK
Nicole Sharp

Seeding Clouds With Wildfire

Raging wildfires send plumes of smoke up into the atmosphere; that smoke is made up of tiny particles that can serve as seeds — nucleation sites — where water vapor can freeze and form clouds. To understand wildfire’s effect on cloud growth, researchers sampled air from the troposphere (the atmosphere’s lowest layer) both in and around wildfire smoke.

The team found that smoke increased the number of nucleating particles up to 100 times higher than the background air, but the exact make-up of the smoke varied significantly by fire. Smoke particles were mostly organic, though inorganic ones appeared as well. The temperature of a fire, as well as what materials it was burning, made a big difference; the fire where they measured the highest particle concentrations included lots of unburned plant material, thought to be carried aloft by turbulence around the fire. (Image credit: K. Barry; research credit: K. Barry et al.; via Eos)

#cloudFormation#fluidDynamics#nucleation
Continued thread
franco_vazza

I have seen now dozens of cool #physics experiments (fluids, forces, angular momentum, waves, energy etc) and I truly enjoyed them as a physicists. But without the actual explanation of what's behind, which sadly requires a minimum of math, no one could understand what is going one.

However, I understand that organising a museum with goal of teaching something, might make it boring and less profitable (no criticism here: museums to survive need to cash in)

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