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2022-11-23: How To See Black Holes By Catching Neutrinos

  • 01:03: They report seeing neutrinos produced in the colossal magnetic fields surrounding a black hole with the mass of 10 million Suns.
  • 09:26: ... know that AGNs have powerful magnetic fields because in many of them we see jets of high energy particles blasted out ...

2022-09-28: Why Is 1/137 One of the Greatest Unsolved Problems In Physics?

  • 02:36: ... spins are separated slightly by their interaction with their own orbital magnetic fields. ...

2022-08-24: What Makes The Strong Force Strong?

  • 11:32: That means photons can interact with objects without affecting their electric charge, and thus neutral objects can interact with magnetic fields.

2022-06-22: Is Interstellar Travel Impossible?

  • 10:38: There are more advanced options for the latter - for example, deflection of grains by magnetic fields or a shielding mass moving in front of the ship.
  • 12:29: These things are accelerated in the monstrous magnetic fields of black holes and supernovae and of the galaxy itself.

2022-05-04: Space DOES NOT Expand Everywhere

  • 13:50: ... is created in a particle collider it travels through the powerful magnetic fields of the detector. The amount by which its path is deflected by that field ...

2022-01-19: How To Build The Universe in a Computer

  • 09:34: ... don’t get me started about the complexity  of including magnetic fields, or of Einstein’s general relativity when the gravitational field becomes ...

2021-10-13: New Results in Quantum Tunneling vs. The Speed of Light

  • 16:08: As it is, the magnetic fields we observe around black holes seem more consistent with regular dipole fields, with both north and south poles.

2021-10-05: Why Magnetic Monopoles SHOULD Exist

  • 04:54: ... require this - but in that version of electromagnetism, the electric and magnetic fields are VERY different from each other, and not at all interchangeable as ...
  • 06:49: So magnetic fields affect charged particles.
  • 07:09: ... presence of the string, with its magnetic fields, should introduce different phase shifts depending on which side of the ...

2021-08-10: How to Communicate Across the Quantum Multiverse

  • 16:27: ... Persona asks what happens to the star’s magnetic fields after it goes supernova. And then guesses the correct answer - it ...
  • 16:58: ... in that magnetic field - what we call synchrotron radiation. Galactic magnetic fields have very clear bubble-like structures that come from past ...

2021-08-03: How An Extreme New Star Could Change All Cosmology

  • 03:19: ... all over the place in a way that suggests the presence of gigantic magnetic fields. Fields around a billion times stronger than the earth or sun’s magnetic ...
  • 09:51: ... the orbits of the parent stars. This process also explains the intense magnetic fields. Magnetic fields in stars and planets are generated by dynamos - ...
  • 14:52: ... your praises, Charlie, and extend their white dwarf blessings: may your magnetic fields stay untangled, your electrons be ever degenerate, and may your mass ...
  • 15:55: ... asks whether magnetic fields have any measurable effect on the orbits of stars around the galaxy. Not ...
  • 16:19: So the locations that stars formed may be influenced by magnetic fields, which in turn affects their orbits. So the answer is yes, sort of.
  • 17:08: ... number of you ask questions about the potential role of magnetic fields in the universe that all have the answer I just gave - can magnetic ...

2021-07-21: How Magnetism Shapes The Universe

  • 01:12: Personally, I’d rather be able to see magnetic fields.
  • 01:51: That means magnetic fields can add up - and magnetism adds up to having enormous influence on the development of structure in our universe.
  • 02:01: Understanding magnetic fields is of fundamental importance to astrophysicists.
  • 05:46: Beyond the heliosphere, seeing magnetic fields gets trickier.
  • 06:29: The light gets polarized - which means the direction of its electric and magnetic fields pick up a preferred direction rather than being random.
  • 07:01: KInda makes me wonder if van Gogh could see magnetic fields.
  • 07:05: Actually there’s a more traditional way to map the magnetic fields of galaxies.
  • 07:35: If the electric and magnetic fields of a collection of photons all tend to point in the same direction, we say the light is linearly polarized.
  • 07:55: The electrons in their magnetic fields tend to slow one circular polarization direction more than the other.
  • 08:12: So by measuring the Faraday rotation of distant radio sources we can also map magnetic fields.
  • 08:21: We even have clear views of magnetic fields in many distant spiral galaxies.
  • 08:30: These are the densest regions of those galactic disks - places where magnetic fields have confined the charged particles of the interstellar plasma.
  • 08:39: And that plasma in turn drags the magnetic fields in orbit around the galaxy.
  • 08:44: OK, so galaxies have magnetic fields.
  • 08:47: But where do those magnetic fields come from?
  • 08:51: Large-scale magnetic fields can grow and reinforce themselves in very particular configurations called dynamos.
  • 09:38: Those supernovae may also give us the seeds of magnetic fields that can then be amplified by the galactic dynamo.
  • 09:53: Magnetic fields generated by collapsing gas clouds help to slow the rotation of those clouds - expel angular momentum.
  • 10:05: And magnetic fields also facilitate star formation after stars die.
  • 10:53: The other cool thing that galactic magnetic fields do is that they act as colossal particle accelerators.
  • 11:20: But the most energetic cosmic rays are accelerated by the strongest magnetic fields.
  • 11:40: Intense magnetic fields live just above the event horizon of some of thses black hole, and thread the infalling disk.
  • 12:05: But there’s an even more spectacular result of these magnetic fields.
  • 12:23: ... jets carry magnetic fields out into the cosmos, and we see them through the radio light emitted by ...
  • 12:38: To summarize what we’ve learned: magnetic fields are ubiquitous, powerful, and extremely complicated.
  • 12:53: But it turns out that without cosmic-scale magnetic fields we probably wouldn’t be here today.
  • 12:59: ... are spending more and more time learning how to map and to model magnetic fields, to better understand the mysteries of this magnetic space ...

2021-04-21: The NEW Warp Drive Possibilities

  • 14:41: ... makes it pretty hard to watch tau particles precess in magnetic fields, and so far the g-factor for the tau hasn’t even been measured to 1 ...
  • 17:54: ... If the Quantum Zeno Effect plays a role in birds' ability to see magnetic fields, then according to the Many-Worlds interpretation are there many, many ...

2021-03-23: Zeno's Paradox & The Quantum Zeno Effect

  • 08:02: ... role in the photochemical reactions that give birds their ability to see magnetic fields - something we’ve talked about ...

2021-02-17: Gravitational Wave Background Discovered?

  • 00:00: ... stars tend to channel jets of high energy particles due to their intense magnetic fields they also rotate rapidly with the rotational axis offset from the ...

2020-12-22: Navigating with Quantum Entanglement

  • 02:32: ... when German biologists Wolfgang Wiltschko and Friedrich Merkel applied magnetic fields to enclosures with European robins, preventing them from navigating ...
  • 02:48: How exactly birds detect magnetic fields remains an open question.
  • 04:56: Magnetic fields exert a force on a moving or rotating charged particle.
  • 05:00: An electron, for example, can be thought of as a spinning charge, and magnetic fields can cause that spin to flip direction.
  • 05:08: ... like the one found in a compass needle aure ferromagnets, and their magnetic fields come from countless electrons with aligned ...
  • 05:17: External magnetic fields tug on those electrons resulting in a force that can swivel the compass needle.
  • 10:33: The team’s calculations showed that only a full quantum description of the process could produce the required sensitivity to magnetic fields.
  • 10:40: ... for example, the valence electrons were just interacting due to their magnetic fields - so-called spin-spin interactions - rather than true entangled states - ...

2020-09-28: Solving Quantum Cryptography

  • 14:52: ... inside a star than outside - cosmic necklaces can be locked into the magnetic fields within the solar plasma so they don’t fall apart ...

2020-09-21: Could Life Evolve Inside Stars?

  • 07:18: ... plasma and magnetic fields may stretch and break necklaces, which could reconfigure them over and ...

2020-08-24: Can Future Colliders Break the Standard Model?

  • 01:22: ... charged particles in a straight line, while the beam is focused by magnetic fields. ...
  • 07:25: ... particle accelerators like the sun or supernovae or quasars or galactic magnetic fields, which continuously spray the earth with particles at higher energies ...

2020-07-08: Does Antimatter Explain Why There's Something Rather Than Nothing?

  • 06:00: ... electrically neutral and so are hard to even store using electric and magnetic fields. ...
  • 08:00: ... anti-protons are trapped by a combination of electric and magnetic fields in a so-called Penning ...

2020-04-28: Space Time Livestream: Ask Matt Anything

  • 00:00: ... on the edge where your giant streamers of plasma are channeled by magnetic fields it's a cool cool toy now but what have I actually been doing during ...

2020-04-14: Was the Milky Way a Quasar?

  • 11:16: ... by electrons, but in this case, the electrons are accelerated by magnetic fields and are emitting what’s known as synchrotron ...

2020-03-16: How Do Quantum States Manifest In The Classical World?

  • 08:44: ... hasn't collapsed. Here’s more evidence, even with the vertically-aligned magnetic fields, which only affect the vertical component of the electron’s spin, we ...

2020-02-11: Are Axions Dark Matter?

  • 08:53: One issue may be that we just can’t make sufficiently strong artificial magnetic fields.
  • 08:58: ... axions. CAST forms the detector part of the apparatus and uses strong magnetic fields of its own to try to turn those axions back into detectable photons. No ...
  • 09:45: ... rays get converted back and forth between axions and photons by the magnetic fields of entire galaxies. That makes them invisible for part of their journey, ...

2020-01-06: How To Detect a Neutrino

  • 03:09: ♪ ♪ More magnetic fields are used to sort the positively charged pion particles from the debris ♪ ♪ and focus *them* into a beam.

2019-09-03: Is Earth's Magnetic Field Reversing?

  • 00:38: Magnetic fields exert a force on moving charged particles, causing them to spiral around those force lines.
  • 02:58: ... we think of magnetic fields being generated in two way: In magnetic materials like iron, the sum ...
  • 03:15: Alternatively, flows of many charged particles like electrons – so electrical currents - can produce magnetic fields.
  • 06:05: Conductors have this cool property that they drag magnetic fields with them.

2019-06-17: How Black Holes Kill Galaxies

  • 06:33: ... through the surrounding galaxy or its channeled into jets by powerful magnetic fields. ...

2019-05-09: Why Quantum Computing Requires Quantum Cryptography

  • 04:58: Polarization defines the direction that its electric and magnetic fields … wave.

2019-05-01: The Real Science of the EHT Black Hole

  • 05:39: It’s also blasting out a jet of energetic particles, channeled by the intense magnetic fields around the black hole.
  • 07:59: Synchrotron results from electrons spiraling in magnetic fields.
  • 08:55: ... simulation that weaves in all of the physics of fluid flow and magnetic fields, in this case with the addition of the warped spacetime of a black hole ...

2019-03-06: The Impossibility of Perpetual Motion Machines

  • 13:47: ... electrons either bumping into other charged particles or circling in magnetic fields Fortunately we can model that stuff pretty ...

2019-01-16: Our Antimatter, Mirrored, Time-Reversed Universe

  • 03:02: ... atoms have negatively charged nuclei which means their nuclear magnetic fields point in the opposite direction to regular matter relative to their ...

2018-11-14: Supersymmetric Particle Found?

  • 03:52: ... explosions, gamma ray bursts, black hole magnetic fields are all expected to blast high energy particles like electrons and ...

2018-08-15: Quantum Theory's Most Incredible Prediction

  • 03:03: Magnetic fields are produced by moving electric charges.
  • 03:21: It mostly comes from the summed dipole magnetic fields of individual electrons in the outer shells of its atoms.
  • 04:20: So electrons have a magnetic dipole moment, meaning they feel magnetic fields and act as little bar magnets.
  • 04:27: Electrons in atoms feel the magnetic fields produced by their own orbits around the atom.
  • 14:48: It's pretty firmly established that energy must be pumped into the corona by magnetic fields.
  • 14:59: Magnetic fields can do the job in two ways.
  • 15:13: Another possible mechanism is through turbulence in waves generated by the rapid motion of magnetic fields.

2018-04-25: Black Hole Swarms

  • 06:39: ... magnetic fields act like a dam, allowing gas from the companion star to build up and ...

2018-01-10: What Do Stars Sound Like?

  • 12:56: The charged particles spiral around the axial magnetic fields and emit photons as they do.

2017-12-20: Extinction by Gamma-Ray Burst

  • 03:08: In that case, the powerful magnetic fields can channel the explosion into narrow jets that massively focus and amplify the blast.

2017-10-11: Absolute Cold

  • 01:00: Using lasers and magnetic fields, we've now managed to cool certain substances to less than a billionth of a Kelvin.

2017-10-04: When Quasars Collide STJC

  • 05:08: Those jets can blast through the surrounding galaxy and beyond, carrying their magnetic fields with them.
  • 05:15: The radio light seen here is from electrons spiraling in those magnetic fields, so-called synchrotron radiation.

2017-09-28: Are the Fundamental Constants Changing?

  • 05:22: They have magnetic fields, just like a little bar magnet, or electric currents rotating in a ring even though there is no actual rotation.
  • 05:38: ... magnetic fields produced by an electron's spin and by its orbital motion actually ...

2017-09-13: Neutron Stars Collide in New LIGO Signal?

  • 02:39: ... stars can rotate up to thousands of times per second and have enormous magnetic fields that result in jets of near light speed particles that sweep through ...

2017-06-28: The First Quantum Field Theory

  • 09:40: ... electron energy levels due to electron spins-- spins interacting with magnetic fields in the so-called hyperfine splitting or spins interacting with vacuum ...

2017-06-21: Anti-Matter and Quantum Relativity

  • 02:47: For example, an electron's spin causes them to align themselves with magnetic fields, just like a rotating electric charge would.

2017-04-19: The Oh My God Particle

  • 06:00: We build artificial ones on Earth using giant rings and powerful magnetic fields.

2017-03-15: Time Crystals!

  • 04:13: Spins in nearby atoms like to line up with each other due to interacting magnetic fields.

2017-01-19: The Phantom Singularity

  • 16:22: ... what I'd expect when you generate temperature differentials and large magnetic fields around a very sensitive position measuring ...

2016-11-30: Pilot Wave Theory and Quantum Realism

  • 14:25: Sebastian Lopez asks how are the magnetic fields of neutron stars created.
  • 15:06: With their extreme rotation rates, neutron stars support electric currents sufficient for magnetic fields of up to 100 million tesla.

2016-09-21: Quantum Entanglement and the Great Bohr-Einstein Debate

  • 08:05: Polarization is just the alignment of a photon's electric and magnetic fields.

2016-07-27: The Quantum Experiment that Broke Reality

  • 12:25: Juno will figure that out by carefully mapping Jupiter's gravitational and magnetic fields.

2015-10-15: 5 REAL Possibilities for Interstellar Travel

  • 05:34: Channeled with magnetic fields, these pions provide our thrust.

2015-10-07: The Speed of Light is NOT About Light

  • 03:45: See, there's a velocity-dependent trade-off between the electric and magnetic fields.
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