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#cosmology

53 posts24 participants3 posts today

Le 1er avril, les scientifiques s'autorisent un peu d'humour sur le très sérieux site de prépublication arxiv.org. Ma sélection des meilleurs "articles" de cette édition 2025 !

1/ Mon préféré : "The Universe is Odd". Déjà le titre est un jeu de mot entre "odd" bizarre et "odd" impair, qui indique donc la parité de quelque chose. L'article commence avec un paragraphe écrit par IA (ce n'est pas moi qui le dit !) pour expliquer ce que les scientifiques entendent par la "parité" de quelque chose : est-ce que notre Univers est symmetrique par symmetrie miroir ? Pour répondre à cette question, les auteurs proposent de compter le nombre de galaxies par groupe de galaxies et de voir si ce nombre est pair ou impair.

Le rapport ? Aucun, et c'est là qu'est la blague ! Vous en voulez encore ?

arxiv.org/abs/2503.22839

Replied in thread

@Bibliothecaris what a delight to see this post and briefly look at the abstract. It seems I'm finally learning how to use Mastodon in finding work that aligns with my own research in Information Dynamics (formerly the Informational Universe hypothesis).

The nexus with this research is my own finding of a resolution parameter to unify seemingly disparate frameworks, from classical Newtonian #physics to EFE/general relativity; through quantum mechanics and beyond into metaphysical #cosmology.

Continued thread

🎬 PS: For a beautifully clear (and delightfully mind-bending!) explanation of what might have existed before the Big Bang, check out PBS Space Time’s fantastic episode, "What Happened Before the Big Bang?" hosted by astrophysicist Matt O’Dowd. Highly recommended as a thoughtful companion to this thread! 🌌🌀✨

👉 Watch it here on PBS Space Time pbs.org/video/what-happened-be

www.pbs.orgPBS Space Time | What Happened Before the Big Bang? | Season 5 | Episode 29We actually have a pretty good idea of what might have happened before the Big Bang.

“We really shouldn’t have found a galaxy like this, given our current understanding of how the universe evolved. Imagine the early universe wrapped in a thick fog, making it extremely hard to detect strong beacons shining through it. Yet here we see this galaxy’s beam piercing through the veil.”

A New Cosmology Mystery: James-Webb Telescope Observes a Galaxy It Shouldn’t!
dailygalaxy.com/2025/03/a-new-

Jades Gs Z13 1 Galaxy
The Daily Galaxy - Great Discoveries Channel · A New Cosmology Mystery: James-Webb Telescope Observes a Galaxy It Shouldn’t!A distant galaxy has just turned up in James Webb's lens—far too bright and far too early. Its ultraviolet glow cuts through a universe that should have been dark and opaque.

#Cosmology poll, let's settle this here and now: Did the universe have an inflationary phase?

Continued thread

📝 Important note:
These visuals are illustrative only—not precise physical depictions of magnitudes or forces involved. Actual conditions during inflation involved extreme energies (near ~10¹⁶ GeV), densities, and scales far beyond intuitive visualization. My illustrations aim purely for conceptual clarity.

Enjoy exploring our cosmic origins! ✨🔭🌠
#Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics

Continued thread

🕳️ Clip 8: Transition to Primordial Universe (Black Holes Form)
This visualization illustrates tiny density fluctuations collapsing into primordial black holes (PBHs) within the hot early universe plasma—originally proposed by Hawking & Carr (1970s). PBHs could influence cosmic structure and potentially explain dark matter. Observational searches ongoing, including data from JWST, LIGO, and future space missions.
🎬 Watch the full-res Sora videos here! sora.com/g/gen_01jqmfmsabfbfsr
🔗 Primordial Black Holes (Carr, Hawking) arxiv.org/abs/2002.12778
🔭 Evidence: Ongoing searches via gravitational lensing (JWST), gravitational waves (LIGO), and large-scale surveys (DESI).
#Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics

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🔥 Clip 7: Reheating Begins
Depicted here is "reheating," where the inflaton’s potential energy rapidly converts into hot plasma of standard model particles, marking the Big Bang's fiery start (~10²⁷ Kelvin initially). This transition phase, predicted by cosmologists including Linde, remains theoretically robust yet poorly understood.
🎬 Watch the full-res Sora videos here! sora.com/g/gen_01jqmfg100eb7r3
🔗 Reheating theory overview arxiv.org/abs/1001.2600
🛰️ Evidence: Consistent with nucleosynthesis abundances and CMB measurements from Planck.
#Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics

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🎢 Clip 6: Slow-Roll Transition
This clip illustrates "slow-roll" inflation, introduced by Andrei Linde. After bubble nucleation, the inflaton field rolls slowly toward a true vacuum. Inflation gradually ends as the energy density decreases. "Slow-roll" inflation precisely matches observational constraints from CMB temperature anisotropies.
🎬 Watch the full-res Sora videos here! sora.com/g/gen_01jqn1yrwcf8b9k
🔗 Slow-roll inflation (Linde) arxiv.org/abs/hep-th/9405187
🔭 Evidence: Precise fits to Planck and WMAP observations of the CMB spectrum.
#Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics

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🌀 Clip 5: Bubble Expansion
Visualizing the true vacuum bubble rapidly expanding into the false vacuum. This phase boundary would propagate at enormous speeds, eventually dominating space. This idea relates to Guth's "bubble universe" scenario and the multiverse hypothesis (eternal inflation) proposed by Paul Steinhardt and Alexander Vilenkin.
🎬 Watch the full-res Sora videos here! sora.com/g/gen_01jqmf0h6begta7
🔗 Eternal Inflation (Steinhardt, Vilenkin) scientificamerican.com/article
🛰️ Evidence: Indirect—no direct detection yet; remains theoretical.
#Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics

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💥 Clip 4: Tunneling Begins (Bubble Nucleation)
This clip represents the theoretical nucleation of a true vacuum bubble, transitioning from a high-energy false vacuum—a scenario described by Sidney Coleman & Frank De Luccia in the 1980s. Quantum tunneling initiates bubble formation.
🎬 Watch the full-res Sora videos here! sora.com/g/gen_01jqmdvxawe8pv2
🔗 Coleman-De Luccia tunneling journals.aps.org/prd/abstract/
🔭 Evidence: Indirectly consistent with structure formation data; currently theoretical and not directly observable. #Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics

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🌌 Clip 3: Quantum Fluctuations Appear
Tiny quantum fluctuations in the inflaton field are illustrated here. Inflation stretched these quantum ripples to enormous scales, seeding all cosmic structures (galaxies, stars). Theoretical predictions by Viatcheslav Mukhanov and Stephen Hawking matched detailed observations.
🎬 Watch the full-res Sora videos here! sora.com/g/gen_01jqn1ftfbf70tz
🔗 Quantum fluctuations as cosmic seeds (Mukhanov) arxiv.org/abs/astro-ph/0303077
🔭 Evidence: Fluctuations precisely measured in CMB by Planck and WMAP, and confirmed by large-scale galaxy surveys like DESI. DESI Project desi.lbl.gov
#Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics

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🚀 Clip 2: False Vacuum Expansion
Here we depict exponential growth driven by the false vacuum’s immense potential energy—space expanded faster than the speed of light, increasing by a factor of at least ~10⁶⁰ in ~10⁻³⁶ seconds. This rapid inflation resolves problems like flatness and horizon issues, as proposed by Guth and further developed by Andrei Linde and Paul Steinhardt.
🎬 Watch the full-res Sora videos here! sora.com/g/gen_01jqmdevs9fpbtt
🔗 Cosmic Inflation theory (Linde, Steinhardt) scientificamerican.com/article
🔭 Evidence: Measurements of flatness and isotropy from WMAP & Planck satellites. NASA WMAP map.gsfc.nasa.gov
#Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics

Continued thread

✨ Clip 1: The Inflaton Field
This clip illustrates a hypothetical quantum scalar field, the inflaton, which cosmologists propose triggered cosmic inflation. Before the Big Bang, space might have existed in a high-energy "false vacuum" state, a concept developed by Alan Guth (1980) to explain rapid expansion.
🎬 Watch the full-res Sora videos here! sora.com/g/gen_01jqmd66m5e1gvw
🔗 Inflationary Universe (Guth, 1980) pmc.ncbi.nlm.nih.gov/articles/
🛰️ Evidence: Cosmic Microwave Background (CMB) uniformity observed by Planck satellite. ESA Planck mission esa.int/Science_Exploration/Sp
#Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics

✨ Thread Intro: Visualizing Cosmic Inflation and the Big Bang ✨

Ever wondered how our universe began? 🤔

I'm exploring cosmic inflation—the rapid expansion of space driven by the mysterious inflaton field. My short, illustrative video clips represent key stages of this theory, starting from a hypothetical quantum field through inflation, quantum fluctuations, reheating into Big Bang plasma, and formation of tiny primordial black holes (PBHs).

Earlier, I shared a visualization showing how some of these PBHs might have evaporated into Hawking radiation, leaving subtle imprints (Hawking relics) that possibly influenced the formation of the first stars and galaxies. hachyderm.io/@suzannealdrich/1

👇 Follow along to see each step illustrated clearly and explained scientifically—complete with references to current theories and observational evidence from missions like JWST, DESI, Planck, and more!

Note: These visuals are conceptual illustrations—not literal representations of the extreme energies and forces involved.

#Cosmology #Inflation #BigBang #PrimordialBlackHoles #QuantumPhysics #Astrophysics 🌌🚀🕳️

Replied to Rowan Brad Quni

@QNFO Before the Big Bang, a quantum field called the inflaton triggered a rapid expansion of space—cosmic inflation.

In a fraction of a second, the universe ballooned from subatomic to cosmic scale, erasing irregularities and seeding structure with quantum ripples. When inflation ended, the inflaton decayed—reheating the universe in a burst of energy that filled space with hot plasma.

From this chaos, dense regions collapsed into tiny, short-lived primordial black holes—echoes of a violent origin.

The next revolution in physics will not discover new particles but refine our informational constructs to capture finer scales. When we do, the Big Bang’s “mystery,” photons’ “duality,” and black holes’ “singularities” will be seen as artifacts of resolution, not reality.

qnfo.org/releases/2025/Before+

QNFOBefore the Big Bang - QNFOBefore the Big Bang: What Photons and Black Holes Have in Common The Big Bang is not an ontological origin point but a threshold of human perception—a moment where our models (Î) fail to resolve the …