Results for “dark matter”

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Biggest Mysteries in Physics: Antimatter, Dark Energy & ToE - Don Lincoln | Lex Fridman Podcast #497

Lex Fridman30 views
1:03:46Right. Until you until you know it's there, it might be wrong. It's like dark matter. People talk about dark matter. It might not be real.1:26:20I don't know. Is dark matter real? I don't know. If it's real, what is it? I don't know. Is dark energy real? Yes,1:27:58humanity. It's the stuff we haven't found. We don't know. I mean the simple one and I'm say simple and it's not but what is dark matter.

"Man-Made Black Holes" CERN Physicist Warns of New Dark Matter Discovery | Daniel Whiteson

Danny Jones1 views
1:18That's incredible. So what what kind of stuff were you specifically working on when you were at CERN? I was looking for dark matter.1:25I was hoping we could figure out what is dark matter made out of. You know, we know that dark matter is out there. We know that it's matter. We know how much1:59matter. And if so, we could find evidence for that in our collisions and uh and learn something about dark matter as a particle. if it is indeed a particle. We don't know that.

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The Different Candidates for Dark Matter, with Katherine Freese

StarTalk21 views
Katie Freeze discusses cutting-edge dark matter detection methods, including the novel use of ancient meteorites (paleo-detectors) to capture dark matter tracks over billions of years, and the theoretical viability of 'dsummaryPaleo-detectors: Instead of building massive new underground facilities, scientists are analyzing ancient olivine crystals from differentiated meteorites that have been collecting dark matter tracks for up to a billion ytakeawayDark Stars: These are hypothetical first-generation stars composed of ordinary matter but powered by dark matter annihilation rather than nuclear fusion. Because they lack fusion heat pressure, they can accrete matter cotakeaway

Interview: Dark Matter = Black Holes? | David Kaiser | Particles of Thought

NOVA PBS Official20 views
The discussion explores dark matter evidence across historical and modern scales, concluding that while particle candidates remain popular, primordial black holes (PBHs) in the asteroid mass range are a viable, conservatsummaryPBHs formed directly from early universe density fluctuations could account for dark matter without requiring new physics, offering testable predictions through gravitational lensing, planetary orbital perturbations, andsummaryHistorical Evidence: Fritz Zwicky (1930s) first inferred dark matter from galaxy cluster velocities in the Coma cluster, noting galaxies moved faster than visible mass could bind. Vera Rubin (1970s) confirmed this with ftakeaway

"Man-Made Black Holes" CERN Physicist Warns of New Dark Matter Discovery | Daniel Whiteson

Danny Jones1 views
CERN physicist Daniel Whitson explains that dark matter is confirmed by nine independent lines of evidence (galaxy rotation, cosmic structure, CMB) but remains undetected as a particle, suggesting our search assumptions summaryDark Matter Evidence: There are nine independent lines of evidence for dark matter, including galaxy rotation curves (stars don't fly off because unseen mass provides gravity), large-scale structure formation (not enoughtakeawayDetection Methodology: At colliders like CERN, dark matter cannot be seen directly. It is detected indirectly via 'missing energy' or momentum imbalance—observing a collision product that recoils against an invisible partakeaway

The origin of galaxies – Malcolm Longair 1990 Christmas Lectures 4/5

The Royal Institution114 views
The lecture explains that galaxy formation is driven by dark matter, which allows structures to form before the universe cooled enough for ordinary matter to clump, resolving the discrepancy between the smooth cosmic micsummaryThe primary challenge remains reconciling these models with particle physics, as the exact nature of dark matter is unknown.summaryDark Matter Necessity: Observations of galaxy rotation and cluster dynamics show 10-20 times more mass than visible matter, proving the universe is dominated by invisible dark matter.takeaway

Do we need a new theory of Gravity?

Abigail James1 views
The video analyzes the scientific debate between Dark Matter and Modified Gravity theories, concluding that while Modified Newtonian Dynamics (MOND) and Emergent Gravity explain galaxy rotation curves well, they fail to summaryMOND (Modified Newtonian Dynamics) accurately predicts galaxy rotation curves by modifying gravity at low accelerations, but fails at galaxy cluster scales and cannot reproduce cosmological data like the Cosmic MicrowavetakeawayRelativistic extensions of MOND, such as TeVeS (Tensor-Vector-Scalar gravity), require adding new fields and degrees of freedom to explain lensing and cosmology, effectively reintroducing complexity similar to dark mattetakeaway