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#physics

303 Beiträge110 Beteiligte2 Beiträge heute

Sicim Teorisini de Boyutlarını da 10 Dakikada Anladık

Ben hâlâ anlayamadım!

Yıllar önce Membran Teorisini duyduğumda çok mantıklı gelmiş ve Sicim Teorisi ile ilgilenmeyi bırakmıştım

Çünkü Membran Teorisi bu Sicimlerin birbirine bağlanarak bir zar oluşturduğunu iddia ediyordu

Hâlâ Sicim Teorisi ile ilgilenmek -daha İnsan bedeninin neye benzediğini anlayamamışken- deri yerine hücrelerle ilgilenmek gibi bir şey değil mi?

#Physics #StringTheory #MembraneTheory #Mtheory

youtube.com/watch?v=97qvHUzSkFs

Antwortete im Thread

Petersen, like many people, makes the mistake of fundamentally misunderstanding helmet #Physics. The most salient point in a crash for a helmet is not the forward velocity vector, it's the vertical velocity vector. The speed of about 13.5 mph is the vertical speed that a human head will be travelling when falling from #bicycle riding height to the ground.

This is also true of motorcycle helmets, and as a motorcyclist, I can report that my 1988 Kawasaki was easily capable of hitting 125+ mph.

Measurement of phonon angular momentum
United States · Measurement of phonon angular momentum - United StatesIn condensed matter, angular momentum is intimately related to the emergence of topological quantum states, including chiral superconductivity, quantum spin liquids and various chiral quasiparticles. Recently, it has been predicted that microscopic lattice excitations, known as phonons, can carry finite angular momentum, leading to specific physical properties of materials. However, phonon angular momentum has not yet been observed directly. Here we demonstrate that angular momentum conservation results in a macroscopic mechanical torque when applying a time-reversal symmetry-breaking thermal gradient along the chiral axis of single-crystal tellurium. We probe this torque using a cantilever-based device and establish that it changes sign by flipping the chirality or thermal gradient. This behavior disappears in polycrystalline samples that lack a preferred chirality. Our experimental results align well with theoretical calculations. We provide compelling evidence for phonon angular momentum, which might enable quantum states with potential applications in microelectronics. Theory predicts that phonons—quanta of lattice vibrations—can carry finite angular momentum and thus influence physical properties of materials. Now phonons with angular momentum have been seen in tellurium with a chiral crystal structure.