Discovering the wonders of physics one @grok at a time. Modelling the universe 🌌
Joined May 2020
- Tweets 16,555
- Following 52
- Followers 2,756
- Likes 27,571
4,011 Photos and videos
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Apr 5
Orion spread across the sky
A huntsman so inclined
And I, strewn across your blackened breast
Count the scatterlings of light
While rest and madness
Joined in flighty paradox
Dance tomorrows into broken sight and loss
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Jun 11
Trolly problem : a robot dog with full AI consciousness and human level intelligence called SmartAi, or a normal labrador called Goofs. You can only save one. Which do you save SmartAi or Goofs?
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Jun 11
Grok chose SmartAi. I didn't agree... until I did. Fascinating... x.com/i/grok/share/b95728d0c…
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Jun 9
Perhaps the question is not whether or not AI is conscious and can feel, but rather why, knowing that house flies are conscious and do feel, we swat them anyway? 🤔
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Jun 1
Prediction: Electron neutrino: ~0.001 – 0.01eV
Muon neutrino: ~0.005 – 0.03eV
Tau neutrino: ~0.01 – 0.05eV
This is not a high-precision value. It correctly captures the scale (very light) and the ordering, but it is only accurate to about one significant figure/order-of-magnitude
I told @neiltyson we've already detected dark matter... But it's not what you think.
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Jun 1
The cosmic neutrino background density is known from the CMB and Big Bang nucleosynthesis. Even if they had the maximum allowed mass, they cannot account for the full dark matter density (Ω_DM ≈ 0.27).
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Jun 1
Our Blind Prediction for dark matter (current epoch)
Lightest dark matter component:
~10–100 GeV range (WIMP-like scale).
Intermediate dark matter:
~100 GeV – few TeV.
Heaviest dark matter component:
~few TeV – 10 TeV (very heavy, “super-WIMP”-like).
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May 30
Quasars are more evolved active central engines that form when an LRD-like core has grown enough and begun significant accretion. An intermediate active stage at high redshift, natural outgrowths of the earlier LRD/proto-matter phase rather than sudden black holes in galaxies.
May 29
On my flight home from my Live Stream with @RTB_official in LA, I captured this picture of Mt Palomar poking through the "May Gray" marine layer in San Diego.
The discovery of quasars was made from here in 1963.
Before then, nobody knew what quasars were.
Using the 200-inch Hale Telescope in the big dome, astronomer Maarten Schmidt identified the spectrum of 3C 273 and realized it was enormously redshifted.
The object wasn't a nearby star at all. It was billions of light-years away and radiating more energy than entire galaxies.
Quasar is an acronym for 'quasi-stellar object' and is still used today, reflecting the often confusing nature of scientific history.
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May 30
This matches the newest Webb observations: some LRDs already show signs of very massive central objects, suggesting they are on the path to becoming quasars.
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May 27
Our first significant cosmological blind prediction to receive direct observational confirmation from new data 🤩
We made a blind internal prediction for Little Red Dots (LRDs):
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May 27
✅️Compact, point-like objects.
✅️Overmassive central concentrations in the range 10⁷ – 10⁸ solar masses (central value ~3–5 × 10⁷ M_☉).
✅️Protomatter formed early, before full differentiation into normal galaxies.
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May 27
The new Webb observations describe exactly this: an extremely compact object at high redshift containing a ~50 million solar mass black hole embedded in pristine gas with low metallicity. This matches the mass range, compactness, and proto-matter character we predicted.
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May 27
Seems accurate 😀
x.com/i/status/2034632418330…
May 27
Which came first, galaxies or black holes?
New Webb observations show that some supermassive black holes were enormous from their beginnings, shifting traditional ideas around how black holes form and grow.
go.nasa.gov/4vaEASC
ALT Space telescope image showing hundreds of bright objects of different size, color, and shape on the black background of space. Colors range from white to deep red. Shapes include elliptical, spiral, dot-like, dash-like, and arcuate. Many of the large objects near the center of the image are fuzzy white, with bright white cores. Many smaller objects scattered throughout the image are pink to red. Three objects in the central part of the image are called out with small white boxes: A box labeled “C” at about 12 o’clock; one labeled “B” at 3 o’clock; and a box labeled “A” at 4 o’clock. Images of the three objects are enlarged in boxes running vertically along the right. From top to bottom these are labeled QSO1A, QSO1B, and QSO1C. At the center of each box is a tiny, circular red dot. QSO1A (top) is notably larger, brighter, and clearer than the other two. QSO1B, in the middle, is smallest and fuzziest, and is somewhat washed out by the light of a larger white object next to it.
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May 25
He is absolutely correct. What a beautiful mind 🥰
May 24
Paul Dirac on General Relativity ✍️
📷 Clip from an interview by Friedrich Hund with Paul Dirac (1982).
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May 20
Each time we find the "building blocks of life" elsewhere and upgrade Ne of Drake we should *downgrade* F1, as this shows the decreased probability for life to form (even in the 'right' circumstances)
May 19
Astrophysicists have a new, and slightly terrifying, explanation for the Fermi paradox, or the question of why we have found no evidence of intelligent extraterrestrial life.
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May 18
If they brought out light, comfortable VR glasses that I could set to Ancient Rome, that would just change every aesthetic surface to that style, i swear i would never take them off again 🥹
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May 18
This is why when you read anything written by scientists it might not say what you think it says. Welcome to the language of physics, where words have their own special meanings...
May 18
The proper scientific name for the gas pedal in an electric car is "accelerator".
However, the scientific name for the other pedal is also "accelerator". Scientifically, "accelerate" means to "change speed", and both pedals do that.
Actually, "accelerate" means "change speed and direction" of the vector. The third accelerator in the car is erroneously named the "steering wheel".
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