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Louis Marmet 🇨🇦

@redshiftdrift@social.sciences.re
mastodon 4.6.8
  • Open on social.sciences.re

Physicien, PhD #QuantumOptics #Astrophysics
Prof. Associé à #YorkUniversity
Boursier #AlexanderVonHumboldt

Intérêts: #Cosmology #HubbleTension

#CosmologicalModel: #LCDM #ΛCDM
Observations: #HST #JWST #ALMA #FRB
Interprétations: #Redshift #CMB .
#DarkMatter #GalaxyEvolution
Utilisez les # hashtags!

242 Followers
61 Following
15 Posts
Joined June 09, 2025
ORCID:
https://orcid.org/0000-0001-6087-5480
Calculateur Cosmologique:
https://cosmology.info/code/marmet_l/cosmology-calculators.html
Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 1mo ago

"The Dying of the Light"
by Wasi Naqvi

#SpaceMirror
🔗 https://astrobites.org/2026/08/13/the-dying-of-the-light/

The Dying of the Light
astrobites.org

The Dying of the Light

Telescopes. Science Funding Cuts. The Commercialization of the night sky and what we can do to change it.

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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 4mo ago
Replying to
@whybird@aus.social @Jaffa@social.linux.pizza @astro_jcm@mastodon.online It's not only the sun, in Adelaide the moon is upside-down🙃 and the first quarter comes last! Most confusing for a Canadian. (Image from https://curious.science.org.au/everything-else/calendars)
Keeping track of time
Curious

Keeping track of time

The way we measure time is influenced by our culture and religion.

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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 4mo ago
Replying to
@whybird@aus.social 👍 I get it:🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 🐇 ... even on the moon! 🤣
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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 4mo ago
Replying to
@whybird@aus.social What? I lived in Adelaide for a year and nobody showed me the bunny!? I see the man a bit differently, with big sad eyes, a big nose and an open mouth. His right cheek is flushed and age spots are visible near his left eye! I hope this helps 😂
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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 5mo ago

"Australia is closing its Very Large eyes to the Universe"

🔗 https://astrobites.org/2026/05/01/australia-rejecting-eso/

Australia is closing its Very Large eyes to the Universe
astrobites.org

Australia is closing its Very Large eyes to the Universe

Literally and figuratively, Australia is closing its eyes to the future of astronomy. Where does that leave its next generation of students?

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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 5mo ago

"NASA shuts off instrument on Voyager 1 to keep spacecraft operating"

🔗 https://phys.org/news/2026-04-nasa-instrument-voyager-spacecraft.html

phys.org
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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 6mo ago
Replying to
@AstroHyde @AllanICarswellObservatory Unfortunately too many clouds... We'll have to wait for Artemis IV😲
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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 6mo ago
Replying to
@AstroHyde @AllanICarswellObservatory Thanks, there's a chance to photograph it with a small telescope! (As long as the clouds go away)
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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 6mo ago
Replying to
@AstroHyde @AllanICarswellObservatory Amazing! 😍 What magnitude do you estimate Orion to have?
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Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 5mo ago

"The abundance of thin dwarf galaxies: a challenge for cosmological simulations"

🔗 https://arxiv.org/abs/2512.11035

The abundance of thin dwarf galaxies: a challenge for cosmological simulations
arXiv.org

The abundance of thin dwarf galaxies: a challenge for cosmological simulations

We study the prevalence of thin galaxies as a function of stellar mass in the range $10^7 < M_{\star} / \rm{M_\odot} < 10^{11}$ using data from the GAMA, DESI, ALFALFA, and Nearby Galaxy catalogs. We use the distribution of projected axis ratios, $q$, to infer the abundance of intrinsically flat galaxies needed to reproduce the observed abundance of highly elongated systems in projection. We find that as many as $40\%$ of galaxies in the mass range $10^9<M_{\star}/\rm{M_\odot}<10^{10}$ are intri

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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 5mo ago

"Non-rotating early galaxy is a surprise to astronomers"
Perhaps the universe is older than they think.

🔗 https://phys.org/news/2026-05-rotating-early-galaxy-astronomers.html

phys.org
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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 3mo ago

"Connecting the Dots: UV-bright Companions of Little Red Dots as Lyman–Werner Sources Enabling Direct-collapse Black Hole Formation"

#LRD #LittleRedDots

🔗 https://iopscience.iop.org/article/10.3847/2041-8213/ae58a5

iopscience.iop.org

Connecting the Dots: UV-bright Companions of Little Red Dots as Lyman–Werner Sources Enabling Direct-collapse Black Hole Formation

Connecting the Dots: UV-bright Companions of Little Red Dots as Lyman–Werner Sources Enabling Direct-collapse Black Hole Formation, Baggen, Josephine F. W., Scoggins, Matthew T., van Dokkum, Pieter, Haiman, Zoltán, Torralba, Alberto, Matthee, Jorryt

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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 1mo ago

"The crisis in cosmology continues: Critical problems in a recent defense of cosmic acceleration"

#CrisisInCosmology

🔗 https://phys.org/news/2026-08-crisis-cosmology-critical-problems-defense.html

phys.org
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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 1mo ago

"Rescue mission is called off for NASA's aging Swift space telescope"
#SWIFT #GRB
🔗 https://phys.org/news/2026-08-mission-nasa-aging-swift-space.html

phys.org
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Open post
Louis Marmet 🇨🇦 @redshiftdrift@social.sciences.re
· 5mo ago
Replying to
@AstroMikeHudson@mastodon.online @jaffe@mastodon.social Exactly! I hope you are not going to follow Betteridge's law of headlines🤔
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