Science hub by Stefan Meyer

19/09/2026

ALBERT EINSTEIN CALLED IT "SPOOKY ACTION AT A DISTANCE"
IN 2022, IT WON THE NOBEL PRIZE

Albert Einstein could never quite come to terms with this consequence of quantum mechanics.

We are talking about quantum entanglement: two quantum systems can be linked in such a way that their measurement results show stronger correlations than classical physics—with its local "hidden variables"—would allow, even across vast distances.

Consequently, in 1935, Einstein, Boris Podolsky, and Nathan Rosen hypothesized that quantum mechanics might be incomplete and that hidden properties could lie behind the observed results.

However, in 1964, John Bell demonstrated mathematically that this idea could be tested experimentally.

Subsequent experiments—including those by John Clauser, Alain Aspect, and Anton Zeilinger—violated Bell's inequalities in exactly the way predicted by quantum mechanics.

For this work, Alain Aspect, John Clauser, and Anton Zeilinger were awarded the Nobel Prize in Physics in 2022.

The crucial point:

Entanglement has been robustly confirmed by experiments. However, it does not allow for the controlled transmission of information faster than the speed of light. Thus, Einstein's theory of relativity is not simply overturned.

And yet, one of the deepest questions in modern physics remains:

18/09/2026

What happens when you fall toward a black hole?

From your perspective, you cross the event horizon in finite proper time. From far away, your signals become increasingly delayed and redshifted, making you appear to slow and fade near the horizon.

21/08/2026

An electron in hydrogen cannot take just any energy. It occupies specific energy levels, and when it drops from a higher level to a lower one, the lost energy leaves as a photon.

The wavelength of that photon depends on the two levels involved.

Drops to n = 1 produce ultraviolet light, n = 2 produce visible Balmer lines, and n = 3 produce infrared Paschen lines.

That is why hydrogen does not emit a continuous rainbow, but a precise set of spectral lines.

05/08/2026

What makes quantum superposition so strange is not that nature “chooses” between possibilities only when we look. It is that before measurement, the alternatives can still carry a definite phase relationship with one another. That phase is physically consequential: it determines how amplitudes combine, producing interference that has no classical analogue.

In quantum mechanics, possibility can evolve, interfere, and leave measurable consequences.

04/08/2026

Scientists Tried to Cut a Photon in Half—and Broke the Rules of Physics

New research shows that cutting a single particle of light spawns photons all the way to infinity.

02/08/2026

Quantum teleportation ..

1. Quantum teleportation transmits information, not matter, by transferring the quantum state of a particle using entanglement.

2. In 2017, researchers successfully teleported quantum information over 1,200 kilometers between Earth and a satellite via entangled photons.

3. The process relies on quantum entanglement, where two particles share a connected state, instantaneously influencing one another regardless of distance.

4. Teleportation involves destroying the original quantum state at the sender’s side to faithfully reproduce it at the receiver’s location.

5. Although quantum teleportation enables revolutionary technologies like quantum networks, it doesn’t allow faster-than-light communication because classical information transfer is still required​.

6. Quantum teleportation could revolutionize quantum computing and secure communication by enabling quantum networks.

7. The "no-cloning theorem" of quantum mechanics makes copying an unknown quantum state impossible, but teleportation sidesteps this limit.

25/07/2026

One of the first successful attempts to unite quantum mechanics with Einstein's special relativity.

Instead of treating a particle as a tiny point, the Klein–Gordon equation describes it as a quantum wave spread throughout space. As the wave evolves, it determines how the particle's probability, energy, and momentum change while remaining consistent with the speed of light.

The equation also revealed something unexpected: solutions with both positive and negative energy. What first appeared to be a mathematical curiosity later became one of the earliest hints that nature permits antiparticles, paving the way for quantum field theory.

Today, the Klein–Gordon equation describes spin-0 particles, including the Higgs field and mesons, and remains a cornerstone of particle physics, cosmology, and our understanding of the early universe.

23/07/2026

There's a paper in astrophysics arguing that we couldn't simulate our entire universe from within our own universe due to fundamental physical limits. If our universe is a simulation, the simulator would have to exist in a reality with fundamentally different laws. That makes the discussion not very relevant, since we can't test it nor know anything about it….

"The basic laws of the universe are simple, but because our senses are limited, we can't grasp them. There is a pattern in creation."

- A. Einstein

18/07/2026

Feynman Diagrams

Every line in this image tells the story of how particles interact. These aren't just sketches. They're the language physicists use to predict what happens inside atoms and particle accelerators.

1. Muon decay:
A muon is unstable and decays into an electron, an electron antineutrino, and a muon neutrino through the weak force, carried by a virtual W boson.

2. Annihilation and pair production:
An electron and a positron can annihilate into a photon, which can then produce a heavier particle pair if enough energy is available.

3. Pion (π⁺) decay:
A positive pion, made of an up quark and an anti-down quark, decays into a positive muon and a muon neutrino through the weak interaction.

4. Electromagnetic repulsion:
Two electrons repel each other by exchanging a virtual photon. This exchange is how the electromagnetic force is described in quantum electrodynamics.

5. Beta decay:
Inside a neutron, a down quark changes into an up quark by emitting a W boson. The neutron becomes a proton while an electron and an electron antineutrino are produced.

6. π⁰ meson production:
During high-energy proton collisions, the strong force can create a neutral pion, which is made from a quark and an antiquark before quickly decaying.

7. Z boson production and decay:
An electron and a positron can create a neutral Z boson, which then decays into a muon and an antimuon.

These diagrams may look simple, but they summarize the fundamental interactions described by the Standard Model of particle physics.

16/07/2026

Discover the boundless possibilities within you through the enlightening video link on String theory https://youtu.be/BtI_d-KAidQ