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A Centuries-Old Experiment Could Help Find Dark Matter · The Quark Side - Quantum Physics Podcast

• 0:01
  Speaker 1: Welcome to the quart Side Quantum Physics podcast, an exploration
• 0:05
  Speaker 1: of the fundamental structure of reality where quantum laws govern matter, energy,
• 0:11
  Speaker 1: and information. Here, uncertainty is a feature, not a flaw,
• 0:16
  Speaker 1: and understanding begins at the smallest scales.
• 0:27
  Speaker 2: Imagine walking through like a really dense, heavy fog.
• 0:31
  Speaker 3: Okay, yeah, I can fix youre.
• 0:33
  Speaker 2: That, right, But here's the catch. You can't actually feel
• 0:36
  Speaker 2: the moisture on your skin. You can't see the mist
• 0:39
  Speaker 2: swirling around you at all, and it doesn't even make
• 0:42
  Speaker 2: a sound as you move through it.
• 0:43
  Speaker 3: So it's completely imperceptible, exactly.
• 0:45
  Speaker 2: You are utterly oblivious to it. Yet it is completely
• 0:49
  Speaker 2: enveloping you, passing through your body and even the chair
• 0:54
  Speaker 2: you're sitting in right now.
• 0:55
  Speaker 3: It's a slightly unsettling image, honestly, but it perfectly encapsulates
• 1:01
  Speaker 3: how we exist within the vast majority of our universe. Yeah,
• 1:04
  Speaker 3: because that fog, that's the dark sector. I mean, we
• 1:08
  Speaker 3: know dark matters out there, right, Yeah, because of the
• 1:11
  Speaker 3: gravitational scaffolding that holds galaxies.
• 1:13
  Speaker 2: Again, there stuff keeping things from flying apart.
• 1:15
  Speaker 3: Exactly, but it just subberly refuses to emit absorb or
• 1:18
  Speaker 3: reflect light, so its actual composition remains well one of
• 1:22
  Speaker 3: those frustrating mysteries in modern physics.
• 1:24
  Speaker 2: Which brings us to what we are talking about today.
• 1:27
  Speaker 2: It's this brilliant, honestly mind bending proposition from theoretical physicists
• 1:32
  Speaker 2: at Ferma Lab, Stanford University, and the University of Delaware.
• 1:36
  Speaker 3: Yeah, this team is doing some really incredible work.
• 1:38
  Speaker 2: They really are. They are hunting a very specific kind
• 1:41
  Speaker 2: of phantom particle. We're talking about a hypothetical entity called
• 1:45
  Speaker 2: a milli charged particle or an MCP.
• 1:48
  Speaker 3: Right.
• 1:48
  Speaker 2: But the mission here, and what makes this whole concept
• 1:51
  Speaker 2: so fascinating, is that instead of building another you know,
• 1:53
  Speaker 2: multi billion dollars super collider to find it, they're proposing
• 1:57
  Speaker 2: we catch this ghost using a modified version of a
• 2:02
  Speaker 2: century's old classical physics experiment.
• 2:05
  Speaker 3: It completely flips the script on how we approach modern discovery.
• 2:08
  Speaker 3: I mean, for the last fifty years, particle physics is
• 2:11
  Speaker 3: basically operated on a brute force philosophy. Figure is better, right,
• 2:14
  Speaker 3: pretty much? Yeah, The idea was always to find smaller,
• 2:17
  Speaker 3: more elusive particles. We just must build larger, more energetic machines.
• 2:21
  Speaker 3: You smash protons together at relativistic speeds and you just
• 2:25
  Speaker 3: sift through the.
• 2:25
  Speaker 2: Wreckage, right, just looking for the pieces.
• 2:27
  Speaker 3: Yeah. But this team is looking at a problem that
• 2:30
  Speaker 3: has totally stumped those gargantuan machines, and they're proposing a
• 2:34
  Speaker 3: solution rooted in fundamental electromagnetism. It's just this incredibly elegant,
• 2:41
  Speaker 3: almost David versus Goliath approach to the dark sector.
• 2:45
  Speaker 2: Okay, so let's unpack this a bit before we can
• 2:47
  Speaker 2: appreciate the track they want to build. We really need
• 2:49
  Speaker 2: to understand the prey. So milli charged particles, right, they're
• 2:54
  Speaker 2: exactly what the name implies, right, particles carrying just a tiny,
• 2:57
  Speaker 2: tiny fraction of the standard.
• 2:59
  Speaker 3: Electric charge exactly. So if standard particles in the standard
• 3:02
  Speaker 3: model have integer charges, like the electron is a charge
• 3:06
  Speaker 3: of negative one, right, right, an MCP might have a
• 3:09
  Speaker 3: charge of one thousandth or even one millionth of an electron.
• 3:11
  Speaker 2: So, in a physical sense, if an electron is like
• 3:13
  Speaker 2: a massive semi truck, you know, barreling down the highway
• 3:16
  Speaker 2: with a huge radar cross section, and MCP is more
• 3:19
  Speaker 2: like a stealth drone.
• 3:21
  Speaker 3: Oh, that's a great way to put it. Yeah.
• 3:23
  Speaker 2: It interacts so weakly with electromagnetic fields that it leaves
• 3:26
  Speaker 2: almost no signature at all.
• 3:28
  Speaker 3: Right, and importantly, mcps are actually considered one of the
• 3:31
  Speaker 3: most mathematically natural extensions of the Standard model.
• 3:34
  Speaker 2: Really, so it's not some huge leap.
• 3:37
  Speaker 3: No, not at all. They don't require us to invent
• 3:39
  Speaker 3: like entirely new frameworks of reality. The math easily accommodates
• 3:45
  Speaker 3: this thing called kinetic mixing.
• 3:46
  Speaker 2: Kinetic mixing, Okay, what is that.
• 3:48
  Speaker 3: It's basically a mixing between our standard electromagnetic field and
• 3:51
  Speaker 3: some hidden dark electromagnetic field. And what's fascinating here is
• 3:55
  Speaker 3: that this mixing would naturally produce particles that appear to
• 3:59
  Speaker 3: have these tiny fractional charges. Ah okay, Yeah, The mathematical
• 4:03
  Speaker 3: parameter space for them is just wide open. And that's
• 4:06
  Speaker 3: precisely because their extreme weakness allows them to evade the
• 4:10
  Speaker 3: constraints of our current particle detectors.
• 4:13
  Speaker 2: They just slip right by, which brings us to the
• 4:15
  Speaker 2: first major hurdle. Right, if they are this elusive, how
• 4:18
  Speaker 2: do we even begin to look for them?
• 4:20
  Speaker 3: Right? Where to even start?
• 4:21
  Speaker 2: Yeah, but the researcher suggests we don't actually need to
• 4:23
  Speaker 2: look deep into the cosmos, because cosmic rays might be
• 4:26
  Speaker 2: doing all the heavy lifting for us. Basically delivering these
• 4:29
  Speaker 2: particles right to our doorstep.
• 4:30
  Speaker 3: Yeah, this is where it gets really cool. High energy
• 4:32
  Speaker 3: cosmic rays, which are mostly just protons they're constantly bombarding
• 4:37
  Speaker 3: the Earth's upper atmosphere, just.
• 4:38
  Speaker 2: Slam it into us all the time.
• 4:40
  Speaker 3: Exactly. So when a really high energy proton like ten
• 4:43
  Speaker 3: tarra electron volts slams into a nitrogen nucleus in the stratosphere,
• 4:48
  Speaker 3: it initiates this massive particle.
• 4:50
  Speaker 2: Shower like a cascade.
• 4:52
  Speaker 3: Yeah, Peon's muleans just a whole cascade of other particles
• 4:55
  Speaker 3: raining down, and the theory posits that in those violent
• 4:58
  Speaker 3: high energy collisions, mcps can actually be produced.
• 5:02
  Speaker 2: Wow Okay.
• 5:03
  Speaker 3: Now, normally, a charged particle moving through matter loses its
• 5:07
  Speaker 3: kinetic energy very quickly through ionization. Basically, it rips electrons
• 5:11
  Speaker 3: off nearby atoms as it passes.
• 5:12
  Speaker 2: By, right bumps into things and slows down. But because
• 5:15
  Speaker 2: ionization energy loss scales with the square of the particles charge,
• 5:19
  Speaker 2: an MCP with a charge of let's say ten to
• 5:21
  Speaker 2: the minus three, it would deposit a million times less
• 5:25
  Speaker 2: energy than a standard muon exactly so it barely interacts
• 5:28
  Speaker 2: at all, which.
• 5:29
  Speaker 3: Is precisely the mechanic we're looking for because they barely interact.
• 5:33
  Speaker 3: They pass right through the atmosphere, through the oceans, and
• 5:37
  Speaker 3: deep into the Earth's crust.
• 5:38
  Speaker 2: Just ghosting right through the planet.
• 5:40
  Speaker 3: Yeah, but they do interact just enough, that's the key,
• 5:44
  Speaker 3: just enough to slow down right over hundreds or thousands
• 5:47
  Speaker 3: of kilometers of rock. They undergo countless microscopic electromagnetic scatterings,
• 5:53
  Speaker 3: so they slowly bleed off their kinetic energy until they
• 5:57
  Speaker 3: undergo local thermalization.
• 5:58
  Speaker 2: Meaning they match the temperature of their surroundings exactly.
• 6:02
  Speaker 3: They slow down so much that their velocity actually drops
• 6:05
  Speaker 3: below the Earth's escape velocity, so they get stuck. They
• 6:07
  Speaker 3: get completely trapped. The Earth's gravity and our geomagnetic fields
• 6:12
  Speaker 3: essentially catch these sluggish phantom particles.
• 6:15
  Speaker 2: Wow.
• 6:15
  Speaker 3: Yeah, it causes them to pool and accumulate around the
• 6:18
  Speaker 3: planet over billions of years.
• 6:20
  Speaker 2: So we could literally be sitting inside an invisible, fractionally
• 6:23
  Speaker 2: charged ocean right now.
• 6:25
  Speaker 3: We very well could be. Some models even suggest they
• 6:27
  Speaker 3: can make up a small, yet highly localized fraction of
• 6:31
  Speaker 3: the dark batter halo.
• 6:32
  Speaker 2: That is wild, But as we mentioned, their minuscule charge
• 6:36
  Speaker 2: means traditional particle detectors are just totally useless here.
• 6:40
  Speaker 3: Yeah, completely useless. A scandered calorimeter in a collider. It
• 6:44
  Speaker 3: triggers when a particle deposits a certain threshold of entity.
• 6:47
  Speaker 2: Right, it waits for a big splash exactly, And.
• 6:49
  Speaker 3: An MCP just slips under that noise floor entirely. It
• 6:52
  Speaker 3: doesn't make a splash at all.
• 6:54
  Speaker 2: Which leads us to the trap. If we have this
• 6:56
  Speaker 2: invisible pool of stealth particles just gathering around the Earth,
• 7:01
  Speaker 2: how do we build a sieve that catches them but
• 7:04
  Speaker 2: ignores the absolutely deafening background noise of the standard model?
• 7:08
  Speaker 3: Right? How do you filter out the noise?
• 7:09
  Speaker 2: Yeah? And the team proposes repurposing a Cavendish test, which
• 7:14
  Speaker 2: is wild because historically Henry Cavendish used a highly sensitive
• 7:18
  Speaker 2: torsion balance to measure the gravitational concept.
• 7:21
  Speaker 3: Oh yes, centuries ago, right, and.
• 7:22
  Speaker 2: Later physicists adapted that extreme precision to test Kulam's law.
• 7:27
  Speaker 2: But the core of this modern proposal it relies on
• 7:30
  Speaker 2: something most people have heard of, a Faraday cage.
• 7:33
  Speaker 3: Ah. Yes, the Faraday cage. It is pretty much the
• 7:37
  Speaker 3: ultimate electromagnetic shield. It's a highly conductive metal enclosure. If
• 7:41
  Speaker 3: you place it in an external electric field, the free
• 7:45
  Speaker 3: electrons in the metal immediately redistribute themselves along the surface
• 7:49
  Speaker 3: to perfectly cancel out the field inside.
• 7:53
  Speaker 2: So it creates a blank slate exactly.
• 7:55
  Speaker 3: The interior of an ideal Faraday cage is an electromagnetic void.
• 8:00
  Speaker 2: Hey, I actually want to push back on that set
• 8:02
  Speaker 2: up for a second. Sure, go ahead, because if the
• 8:04
  Speaker 2: goal is to detect a phenomenally weak electromagnetic signal from
• 8:08
  Speaker 2: an MCP, why on earth are we putting our detector
• 8:11
  Speaker 2: inside an electromagnetic void.
• 8:13
  Speaker 3: That's a very fair question.
• 8:15
  Speaker 2: Right, because a Faraday cage is what makes your cell
• 8:17
  Speaker 2: phone drop its signal in a metal elevator. Though, the
• 8:21
  Speaker 2: work function of a metal shell is specifically designed to
• 8:23
  Speaker 2: act as an energy clif it stops external signals. So
• 8:27
  Speaker 2: aren't we just blinding our own instruments by doing this?
• 8:29
  Speaker 3: It sounds like it, But that energy cliff, the work
• 8:32
  Speaker 3: function you mentioned, is exactly why the trap works. You
• 8:35
  Speaker 3: just have to look at how different particles experience that cliff. Okay,
• 8:38
  Speaker 3: how so well for an integer charge particle like an
• 8:40
  Speaker 3: arrent background electron or a cosmic ray MEU on the
• 8:44
  Speaker 3: metal lattice of the cage presents a massive barrier. They
• 8:47
  Speaker 3: interact strongly with the metal hit the cliff and are
• 8:50
  Speaker 3: either absorbed or deflected.
• 8:52
  Speaker 2: So they crash into the wall.
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  Speaker 3: Exactly, the cage is opaque to them. But for an MCP,
• 8:57
  Speaker 3: because its charge is fractional, its interaction with the lattice
• 9:01
  Speaker 3: is infinitesimally small.
• 9:03
  Speaker 2: Oh I see, yeah, it.
• 9:04
  Speaker 3: Basically doesn't have to pay the energy toll across the barrier.
• 9:07
  Speaker 2: Okay, so it's kind of like an architectural acoustic dampener.
• 9:10
  Speaker 2: The cage absorbs all the high amplitude noisy frequencies of
• 9:14
  Speaker 2: the standard model, leaving absolute silence inside. Right, But the mcps,
• 9:19
  Speaker 2: because they are operating on a completely different lower amplitude physics,
• 9:23
  Speaker 2: they just glide right through the walls unperturbed.
• 9:26
  Speaker 3: That is a perfect analogy. The Faraday cage is acting
• 9:29
  Speaker 3: as a highly aggressive low pass filter. It drips away
• 9:33
  Speaker 3: all the background radiation that usually blinds our.
• 9:35
  Speaker 2: Instruments, leaving a completely sterile room.
• 9:37
  Speaker 3: Exactly. We are left with an electromagnetically sterile environment inside
• 9:42
  Speaker 3: the cage, populated only by whatever mcps happen to be
• 9:46
  Speaker 3: drifting through the laboratory.
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  Speaker 2: But wait, drifting mcps are still invisible, right, Like we've
• 9:51
  Speaker 2: filtered out the noise. Sure, but a silent room doesn't help.
• 9:55
  Speaker 2: If the ghost doesn't make a.
• 9:56
  Speaker 3: Sound, right, you still have to see it somehow.
• 9:58
  Speaker 2: Yeah, So, how do do we force these fractionally charged
• 10:02
  Speaker 2: particles to reveal themselves once they are actually inside the cage?
• 10:06
  Speaker 3: Well, we compel them to move collectively, can make them
• 10:10
  Speaker 3: dance basically. Yeah, the researchers propose surrounding the interior setup
• 10:15
  Speaker 3: with oscillating positive and negative potentials.
• 10:18
  Speaker 2: Okay, so applying a voltage.
• 10:20
  Speaker 3: Right, they essentially apply a rapidly alternating high voltage to
• 10:24
  Speaker 3: a conducting boundary inside. Now, the mcps have a tiny charge, sure,
• 10:29
  Speaker 3: but it is non.
• 10:30
  Speaker 2: Zero, so they still feel it exactly.
• 10:32
  Speaker 3: When you apply an oscillating potential. The mcps respond.
• 10:35
  Speaker 2: They get dragged back and forth by the shifting potential.
• 10:38
  Speaker 3: Yes, they rush in toward the boundary, then get repelled outward,
• 10:41
  Speaker 3: completely synchronized with the frequency of the oscillator. We are
• 10:44
  Speaker 3: forcibly inducing a macroscopic alternating current made entirely of dark
• 10:49
  Speaker 3: matter candidates.
• 10:50
  Speaker 2: Here's where it gets really interesting to me, because by
• 10:53
  Speaker 2: inducing that current, we are setting up a scenario that
• 10:57
  Speaker 2: classically speaking should not exist. You have an oscillating current
• 11:01
  Speaker 2: of charged particles slashing around inside a perfectly shielded Faraday cage.
• 11:07
  Speaker 2: Those moving charges are going to generate their own internal
• 11:11
  Speaker 2: oscillating electric field.
• 11:13
  Speaker 3: And if we connect this to the bigger picture, detecting
• 11:16
  Speaker 3: an electric field inside a perfectly shielded cage is a
• 11:19
  Speaker 3: profound anomaly. It breaks the rules, well, it bends them.
• 11:23
  Speaker 3: According to classical electrodynamics, specifically Goss's law, the electric field
• 11:28
  Speaker 3: inside a hollow conductor containing no standard charge should be
• 11:31
  Speaker 3: strictly zero.
• 11:32
  Speaker 2: Right, because all the charges on the outside surface exactly.
• 11:35
  Speaker 3: Furthermore, Kulam's law the inverse square law governing the electric force.
• 11:40
  Speaker 3: It relies entirely on the photon being a completely massless
• 11:43
  Speaker 3: gauge boson.
• 11:44
  Speaker 2: Okay, a massless photon.
• 11:45
  Speaker 3: Yeah, And a massless photon dictates that electromagnetic forces have
• 11:48
  Speaker 3: infinite range.
• 11:49
  Speaker 2: But the presence of this MCP current alters that fundamental interaction,
• 11:54
  Speaker 2: doesn't it.
• 11:55
  Speaker 3: It does. It induces a phenomenon known as dobby screening.
• 11:58
  Speaker 2: Dobby screening okay, Yeah.
• 12:00
  Speaker 3: When the MCP plasma sloshes back and forth, the collective
• 12:04
  Speaker 3: movement of all those fractional charges actually screens the electric field. Mathematically,
• 12:10
  Speaker 3: it alters the electromagnetic potential from the standard infinite range
• 12:14
  Speaker 3: inver square law to an exponentially decaying.
• 12:17
  Speaker 2: One, so it drops off faster, much faster.
• 12:19
  Speaker 3: It becomes a Yukawa potential.
• 12:21
  Speaker 2: Wait, a Yukawa potential isn't that usually associated with the
• 12:24
  Speaker 2: strong nuclear force, like where the mediating particles actually have mass. Yes, exactly,
• 12:29
  Speaker 2: So you're saying the slashing mcps are effectively giving the
• 12:32
  Speaker 2: photon a mass.
• 12:33
  Speaker 3: Precisely, they generate what physicists call a plasma mass for
• 12:37
  Speaker 3: the photon.
• 12:38
  Speaker 2: That is mind blowing.
• 12:39
  Speaker 3: It really is. The photon itself hasn't fundamentally changed, right,
• 12:42
  Speaker 3: but the environment, the vacuum that is now populated by
• 12:45
  Speaker 3: this MCP plasma, it forces the electromagnetic field lines to
• 12:49
  Speaker 3: behave as if the photon is massive.
• 12:51
  Speaker 2: Because of the interference from the mcps, right, the.
• 12:55
  Speaker 3: Field can't reach infinity anymore. It gets damped. So by
• 12:58
  Speaker 3: measuring the specific dampening and the anomalous oscillating electric field
• 13:02
  Speaker 3: inside the cage, we aren't observing a violation of.
• 13:06
  Speaker 2: Physics, right, the laws still hold.
• 13:08
  Speaker 3: Yeah, we are observing a hidden plasma bending the local
• 13:11
  Speaker 3: geometry of the electromagnetic field that.
• 13:13
  Speaker 2: Is genuinely incredible. We are using the bedrock laws of
• 13:17
  Speaker 2: classical physics as an anvil, and we're using an oscillating
• 13:21
  Speaker 2: voltage as a hammer just to force these phantom particles
• 13:24
  Speaker 2: to ring like a bell.
• 13:25
  Speaker 3: That's a very poetic way to put it, but mechanically
• 13:28
  Speaker 3: that's exactly what's happening.
• 13:29
  Speaker 2: But let's look at the actual numbers here for a second.
• 13:31
  Speaker 2: Because the theory is beautiful, it's elegant, But how does
• 13:35
  Speaker 2: a tabletop Faraday cage experiment mathematically stack up against something
• 13:39
  Speaker 2: like the large Hadron collider or the proposed future circular collider.
• 13:43
  Speaker 3: Well, you might be surprised. The sensitivity calculations published by
• 13:46
  Speaker 3: this team are staggering. They project that this modified Cavendish
• 13:51
  Speaker 3: test could achieve sensitivities more than three orders of magnitude
• 13:54
  Speaker 3: beyond any current or proposed accelerator experiment.
• 13:58
  Speaker 2: Wait, three orders of magnet. That's a thousand fold increase.
• 14:02
  Speaker 3: A thousand fold increase in our ability to detect fractional charge.
• 14:06
  Speaker 2: Yes, a thousand fold increase using a tabletop setup compared
• 14:10
  Speaker 2: to a twenty seven kilometer tunnel at CERN.
• 14:13
  Speaker 3: It's wild, isn't it?
• 14:14
  Speaker 2: It seems almost counterintuitive until you look at the mass
• 14:17
  Speaker 2: range they're actually targeting. They are looking specifically at the
• 14:21
  Speaker 2: mega electron vault to giga electron vault range, right, the
• 14:25
  Speaker 2: med toa jevscale.
• 14:26
  Speaker 3: Which is an incredibly well trodden energy regime. I mean,
• 14:29
  Speaker 3: physicists have been probing the Metajev scale for a century.
• 14:33
  Speaker 2: Right, it's not new territory.
• 14:34
  Speaker 3: No, it's the scale of electrons, muons and protons. You
• 14:38
  Speaker 3: would think if there are particles hiding there, we would
• 14:40
  Speaker 3: have found them by now.
• 14:41
  Speaker 2: We've been looking at it forever exactly.
• 14:43
  Speaker 3: But colliders are designed to detect high energy deposition or
• 14:48
  Speaker 3: specific missing transverse momentum from a massive collision.
• 14:52
  Speaker 2: The big splashes we talked about earlier.
• 14:54
  Speaker 3: Right, an MCP doesn't decay in a detectable way, and
• 14:58
  Speaker 3: it barely deposits any energy at all. So the colliders
• 15:01
  Speaker 3: have essentially been looking right past them this whole time.
• 15:04
  Speaker 2: Because colliders are looking for individual violent scattering events, and
• 15:08
  Speaker 2: this proposed experiment abandons the individual scattering event.
• 15:12
  Speaker 3: Entirely, Yes, completely abandons it, right.
• 15:14
  Speaker 2: By inducing a bulk macroscopic current and then measuring the
• 15:19
  Speaker 2: resulting internal electric field with an ultrasensitive electrometer. They are
• 15:23
  Speaker 2: basically integrating the signal over time, right.
• 15:26
  Speaker 3: They are coaxing a collective behavior out of the mcps,
• 15:30
  Speaker 3: just trying to lift that tiny collective signal above the
• 15:33
  Speaker 3: thermal noise.
• 15:34
  Speaker 2: Which raises an important point about our future approach to
• 15:37
  Speaker 2: particle physics in general, because the team isn't just modeling
• 15:39
  Speaker 2: this on a.
• 15:40
  Speaker 3: Chalkboard, right, No, they are actually actively working with experimental
• 15:44
  Speaker 3: groups at Stanford to build a prototype.
• 15:47
  Speaker 2: Wow already.
• 15:48
  Speaker 3: Yeah, and by utilizing existing highly mature technology things like
• 15:52
  Speaker 3: precision oscillators, advanced cryogenic shielding, and state of the art
• 15:56
  Speaker 3: superconducting quantum interference devices or.
• 15:59
  Speaker 2: Squides squads Right, those are used to measure the microscopic, magnetic,
• 16:03
  Speaker 2: and electric fields exactly.
• 16:05
  Speaker 3: By using all this existing tech, they could potentially achieve
• 16:08
  Speaker 3: groundbreaking results in a matter of years, not decades.
• 16:12
  Speaker 2: And the threshold they're aiming for is just breathtaking. The
• 16:16
  Speaker 2: calculation suggests this setup could detect a signature even if
• 16:19
  Speaker 2: millicharged particles make up less than one part in a
• 16:21
  Speaker 2: trillion of all the dark matter in the universe.
• 16:24
  Speaker 3: Yeah, let that sink in for a second. One part
• 16:27
  Speaker 3: in a trillion.
• 16:27
  Speaker 2: It's almost incomprehensible.
• 16:29
  Speaker 3: It highlights how incredibly precise this methodology is. We don't
• 16:33
  Speaker 3: need mcps to be the dominant form of dark matter.
• 16:36
  Speaker 3: They could be just a trace element, a minute impurity
• 16:39
  Speaker 3: in the cosmic makeup, and this modified Cavendish test would
• 16:43
  Speaker 3: still be able to isolate their signature.
• 16:46
  Speaker 2: So what does this all actually mean for you listening
• 16:48
  Speaker 2: right now? Why does a highly technical paper on farity
• 16:51
  Speaker 2: cages and fractional charges matter?
• 16:53
  Speaker 3: That's a fair question.
• 16:54
  Speaker 2: For decades, our approach to the deepest mysteries of the
• 16:57
  Speaker 2: universe has been defined by scaling up bigger magnets, longer tunnels,
• 17:01
  Speaker 2: higher energies. We've essentially built these massive monuments to high
• 17:05
  Speaker 2: energy physics.
• 17:06
  Speaker 3: We really have.
• 17:06
  Speaker 2: But this proposal proves that human ingenuity and just a
• 17:10
  Speaker 2: shifting perspective can still outpace brute force. We are repurposing
• 17:15
  Speaker 2: the rigid, immutable rules of electromagnetism against themselves. We're using
• 17:20
  Speaker 2: them to act as a high tech sieve, filtering out
• 17:23
  Speaker 2: the known universe so we can just sit in the
• 17:25
  Speaker 2: silence and listen to the whispers of the unknown.
• 17:28
  Speaker 3: It is a phenomenal demonstration of how mature physics can
• 17:31
  Speaker 3: be applied to frontier problems. The fact that a nineteenth
• 17:34
  Speaker 3: century experimental architecture combined with modern quantum magnetometers could solve
• 17:39
  Speaker 3: a twenty first century dark matter problem. It's just a
• 17:43
  Speaker 3: testament to the continuity and beauty of the scientific method.
• 17:46
  Speaker 2: Which leaves us with a final thought to consider. When
• 17:48
  Speaker 2: we talk about dark matter, we tend to talk about
• 17:50
  Speaker 2: it as a monolith.
• 17:51
  Speaker 3: Yeah, Like it's just one big thing.
• 17:53
  Speaker 2: Right, a single heavy, invisible particle that merely provides the
• 17:56
  Speaker 2: gravitational glue for galaxies. But if all the charged particles exist,
• 18:01
  Speaker 2: and if they make up even one part in a
• 18:03
  Speaker 2: trillion of that dark matter halo, it implies the dark
• 18:06
  Speaker 2: sector is not a monolith at all.
• 18:07
  Speaker 3: It implies a complex, hidden structure exactly.
• 18:11
  Speaker 2: It suggests an entire invisible ecosystem, a dark sector with
• 18:15
  Speaker 2: its own chemistry, its own fundamental forces, and its own
• 18:19
  Speaker 2: diverse family of particles, A rich, phantom universe swirling like
• 18:23
  Speaker 2: a dense fog passing right through the room you are
• 18:25
  Speaker 2: sitting in right now.