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#darkenergy

3 Beiträge3 Beteiligte0 Beiträge heute
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earthling

"However, that might not happen. We might search and make no headway in understanding the situation. If that happens, we would need to rethink not just our research, but the study of cosmology itself. We would need to find an entirely new cosmological model, one that works as well as our current one but that also explains this discrepancy. Needless to say, it would be a tall order."

singularityhub.com/2025/04/12/

#cosmology
#universe
#DarkEnergy

Flammarion engraving 1888 https://en.wikipedia.org/wiki/Flammarion_engraving
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IRAP

[Zoom on the #CosmicWeb] Have you dived into the deep fields of #Euclid revealed this Wednesday by the @ec_euclid ? Have you navigated between the thousands of #galaxies of different shapes, sizes, colors and masses? So many objects, near and far, fill our #Universe! sky.esa.int/esasky/?hide_welco

What if their spatial distribution could tell us something about two mysterious components : #DarkMatter and #DarkEnergy? This is the gamble taken by the scientists involved in the Euclid mission. To do so, they've designed some unrivalled #instruments: a camera with great depth of field and high resolution records the variety of shapes and spatial distribution of galaxies, while a #spectrometer coupled with a #photometer can determine the distances and masses of galaxies ...

Alain Blanchard, professor at the University of Toulouse and researcher at IRAP, comments on the consortium's first-ever publication of scientific data: irap.omp.eu/en/2025/03/euclid-

Euclid Deep Field South. Copyright ESA
Öffentlich
Cosmic Log

Sky survey boosts the case for dark energy’s downturn
It's looking more and more as if dark energy, the mysterious factor that scientists say is behind the accelerating expansion of the universe, isn't as constant as they once thought.

The latest findings from the Dark Energy Spectroscopic Instrument, or DESI, don't quite yet come up to the level of
cosmiclog.com/2025/03/20/sky-s
#CosmicSpace #Cosmology #DarkEnergy #DESI #Space

Cosmic Log · Sky survey boosts the case for dark energy’s downturnIt’s looking more and more as if dark energy, the mysterious factor that scientists say is behind the accelerating expansion of the universe, isn’t as constant as they once thought. The…
Öffentlich
Daniel Fischer

Illuminating the Physics of #DarkEnergy with the Discovery Simulations: arxiv.org/abs/2503.05947 -> Argonne team uses Aurora supercomputer to investigate potential dark energy breakthrough: anl.gov/article/argonne-team-u - recent results from the Dark Energy Spectroscopic Instrument hint at new physics beyond the standard model of cosmology.

arXiv.orgIlluminating the Physics of Dark Energy with the Discovery SimulationsIn this paper, we present the Discovery simulations: a new pair of high-resolution N-body simulations motivated by the DESI Y1 BAO cosmological constraints on dark energy. The Discovery simulations were run with identical initial conditions, and differ only in their cosmological parameters. The first simulation is based on a flat $Λ\mathrm{CDM}$ cosmology, while the second is based on a $w_0 w_a\mathrm{CDM}$ cosmology, with particular parameter values chosen based on the DESI analysis which includes constraints from BAO with CMB priors. Both simulations evolve $6720^3$ particles in a box with a side length of $L_\mathrm{box} = 1.5$ Gpc, leading to a mass resolution of $\sim4 \times 10^8$ $\mathrm{M}_{\odot}$ in each simulation. In this work we demonstrate the impact of the $w_0 w_a\mathrm{CDM}$ cosmology on the matter power spectrum, halo mass function, and halo mass accretion rate. We also populate halos with galaxies using a novel forward model for in-situ star formation, and examine the way in which changes to cosmology manifest as changes in star formation history. The Discovery simulations provide a testbed for alternative cosmological probes that may offer additional constraining power beyond BAO, such as higher-order summary statistics and observables in the nonlinear regime. Halo catalogs from the Discovery simulations are publicly available and can be downloaded from the HACC Simulation Data Portal.
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formuchdeliberation

Could the universe ever stop expanding? New theory proposes a cosmic ‘off switch’ | Live Science…

Dark energy, the mysterious phenomenon that powers the expansion of the universe, may undergo periodic 'violent transitions' that reverse the growth of the #cosmos... #darkenergy #astronomy #cosmology

formuchdeliberation.wordpress.

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