#darkenergy — Public Fediverse posts

Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It.

The driving force behind our universe’s accelerated expansion remains one of the greatest mysteries in astronomy. While this…
#NewsBeep #News #Space #Astronomy #AU #Australia #BigData #Darkenergy #galaxies #maps #Science #Universe
https://www.newsbeep.com/au/883350/

Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It.

The driving force behind our universe’s accelerated expansion remains one of the greatest mysteries in astronomy. While this…
#NewsBeep #News #Space #Astronomy #AU #Australia #BigData #Darkenergy #galaxies #maps #Science #Universe
https://www.newsbeep.com/au/883350/

https://www.europesays.com/ie/677151/ Two of the Universe’s Great Mysteries May Have Their Own Dimension #astrophysics #DarkEnergy #DarkMatter #Éire #IE #Ireland #QuantaMagazine #Science #Space #StringTheory

Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It.

The driving force behind our universe’s accelerated expansion remains one of the greatest mysteries in astronomy. While this…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Science #Astronomy #BigData #DarkEnergy #galaxies #Maps #Space #universe
https://www.newsbeep.com/us/839643/

Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It.

The driving force behind our universe’s accelerated expansion remains one of the greatest mysteries in astronomy. While this…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Science #Astronomy #BigData #DarkEnergy #galaxies #Maps #Space #universe
https://www.newsbeep.com/us/839643/

https://www.europesays.com/uk/1191417/ Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It. #Astronomy #BigData #DarkEnergy #Galaxies #Maps #Science #Space #UK #UnitedKingdom #Universe

https://www.europesays.com/ie/676807/ Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It. #Astronomy #BigData #DarkEnergy #Éire #Galaxies #IE #Ireland #maps #Science #Space #universe

Two of the Universe's Great Mysteries May Have Their Own Dimension

https://fed.brid.gy/r/https://www.wired.com/story/dark-energy-matter-may-have-own-dimension/

Two of the Universe's Great Mysteries May Have Their Own Dimension

https://fed.brid.gy/r/https://www.wired.com/story/dark-energy-matter-may-have-own-dimension/

Two of the Universe's Great Mysteries May Have Their Own Dimension

https://fed.brid.gy/r/https://www.wired.com/story/dark-energy-matter-may-have-own-dimension/

Two of the Universe's Great Mysteries May Have Their Own Dimension

https://fed.brid.gy/r/https://www.wired.com/story/dark-energy-matter-may-have-own-dimension/

Two of the Universe's Great Mysteries May Have Their Own Dimension

https://fed.brid.gy/r/https://www.wired.com/story/dark-energy-matter-may-have-own-dimension/

Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It.

https://fed.brid.gy/r/https://www.wired.com/story/astronomers-complete-largest-map-of-space-yes-you-can-play-with-it/

Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It.

https://fed.brid.gy/r/https://www.wired.com/story/astronomers-complete-largest-map-of-space-yes-you-can-play-with-it/

Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It.

https://fed.brid.gy/r/https://www.wired.com/story/astronomers-complete-largest-map-of-space-yes-you-can-play-with-it/

Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It.

https://fed.brid.gy/r/https://www.wired.com/story/astronomers-complete-largest-map-of-space-yes-you-can-play-with-it/

Astronomers Have Completed the Largest Map of Space. Yes, You Can Play With It.

https://fed.brid.gy/r/https://www.wired.com/story/astronomers-complete-largest-map-of-space-yes-you-can-play-with-it/

The Beginnings of Man -Part 1

https://tonyaholisticblog.com/2026/08/31/the-beginnings-of-man-part-1/

While the holy grail of #InhomogeneousCosmology is to explain #DarkEnergy as an epiphenomenon of the cosmologically recent formation epoch of #CosmicVoids and other #LargeScaleStructure, #YonadavBarryGinat and #PedroGFerreira have gone for a more modest goal: keeping the #CosmologicalConstant but tacking on void formation to get a sort-of #BeyondLCDM inhomogeneous model that better matches #DES and #DESI results [1].

#ArXiv_2601_20633
@cosmology #Cosmology #LCDM

[1] https://arxiv.org/abs/2601.20633

Cosmology Results from DESI

Yesterday evening (10pm Irish Time) saw the release of new results from the Dark Energy Spectroscopic Instrument (DESI), completing a trio of major announcements of cosmological results in the space of two days (the Atacama Cosmology Telescope and the Euclid Q1 release being the others). I didn’t see the DESI press conference but you can read the press release here.

There were no fewer than eight DESI papers on the astro-ph section of the arXiv this morning. Here are the titles with links:

• DESI DR2 Results I: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints;
• Construction of the Damped Lyα Absorber Catalog for DESI DR2 Lyα BAO;
• Validation of the DESI DR2 Lyα BAO analysis using synthetic datasets;
• Validation of the DESI DR2 Measurements of Baryon Acoustic Oscillations from Galaxies and Quasars;
• Extended Dark Energy analysis using DESI DR2 BAO measurements;
• Constraints on Neutrino Physics from DESI DR2 BAO and DR1 Full Shape;
• Data Release 1 of the Dark Energy Spectroscopic Instrument.

You can see from the titles that the first seven of these relate to the second data release (DR2; three years of data) from DESI; the last one listed here is a description of the first data release (DR1), which is now publicly available.

Obviously there is a lot of information to digest in these papers so here are two members of the DESI collaboration talking with Shaun Hotchkiss on Cosmology Talks about the key messages from the analysis of Baryon Acoustic Oscillations (the BAO in the titles of the new papers):

https://www.youtube.com/watch?v=YiRaDtslycE

A lot has been made in the press coverage of these results about the evidence that the standard cosmological model is incomplete; see, e.g., here. Here are a few comments.

As I see it, taken on their own, the DESI BAO results are broadly consistent with the ΛCDM model as specified by the parameters determined by the Cosmic Microwave Background (CMB) inferred from Planck. Issues do emerge, however, when these results are combined with other data sets. The most intriguing of these arises with the dark energy contribution. The simplest interpretation of dark energy is that it is a cosmological constant (usually called Λ) which – as explained here – corresponds to a perfect fluid with an equation-of-state p=wρc2 with w=-1. In this case the effective mass density of the dark energy ρ remains constant as the universe expands. To parametrise departures from this constant behaviour, cosmologists have replaced this form with the form w(a)=w0+wa(1-a) where a(t) is the cosmic scale factor. A cosmological constant Λ would correspond to a point (w0=-1, wa=0) in the plane defined by these parameters, but the only requirement for dark energy to result in cosmic acceleration is that w<0 not that w=-1.

The DESI team allow (w0, wa) to act as free parameters and let the DESI data constrain them, either alone or in combinations with other data sets, finding evidence for departures from the “standard values”. Here’s an example plot:

The DESI data don’t include the standard point (at the intersection of the two dashed lines) but the discrepancy gets worse when other data (such as supernovae and CMB) are folded in, as in this picture. The weight of evidence suggests a dark energy contribution which is decreasing with time.

These results are certainly intriguing, and a lot of credit is due to the DESI collaboration for working so hard to identify and remove possible systematics in the analysis (see the papers above) but what do they tell us about ΛCDM?

My view is that we’ve never known what the dark energy actually is or why it is so large that it represents 70% of the overall energy density of the Universe. The Λ in ΛCDM is really just a place-holder, not there for any compelling physical reason but because it is the simplest way of accounting for the observations. In other words, it’s what it is because of Occam’s Razor and nothing more. As with any working hypothesis, the standard cosmological model will get updated whenever new information comes to light (as it is doing now) and/or if we get new physical insights into the origin of dark energy.

Do the latest observations cast doubt on the standard model? I’d say no. We’re seeing an evolutionary change from “We have no idea what the dark energy is but we think it might be a cosmological constant” to “We still have no idea what the dark energy is but we think it might not be a cosmological constant”.

#baryonAcousticOscillations #cosmologicalConstant #Cosmology #DarkEnergy #DarkEnergySpectroscopicInstrument #OccamSRazor #ShaunHotchkiss

#AlanGuth - How Does #DarkEnergy Drive the #Universe?

https://www.youtube.com/watch?v=uTj9qHNoyAQ

#Philosophy #PhilosophyOfScience #Science #PhilosophyOfCosmology #Cosmology #BigBang #Inflation #Expansion #HubbleExpansion #GR #GeneralRelativity #QM #QuantumMechanics #Astrophysics #CosmologicalConstant #CloserToTruth #RobertKuhn

#SaulPerlmutter - Why Did Our #Universe Begin?

https://www.youtube.com/watch?v=xMu4xFgucJs

#Philosophy #PhilosophyOfScience #Science #PhilosophyOfCosmology #Cosmology #Astrophysics #Astronomy #BigBang #Inflation #CMB #CosmicMicrowaveBackground #Expansion #DarkEnergy #CosmologicalConstant #Space #SpaceTime #DarkMatter #Gravity #CloserToTruth #RobertKuhn

#RaphaelBousso - Why #Believe in #MultipleUniverses?

https://www.youtube.com/watch?v=qWMX950Fexo

#Philosophy #PhilosophyOfScience #Science #PhilosophyOfCosmology #Cosmology #Astrophysics #Physics #Universe #Multiverse #LawsOfPhysics #LawsOfNature #StringTheory #StringTheoryLandscape #Dimensions #CosmologicalConstant #DarkEnergy #CloserToTruth #RobertKuhn

Two more #SamhainAgusScience festival 2023 events. For more information and to book your places for these in-person events, check out our Eventbrite festival collection https://www.eventbrite.com/cc/samhain-agus-science-2023-2590849 #DIASdiscovers #space #darkenergy #science #physics #Dublin #mastadaoine

#BrianKeating - What Does an #Expanding #Universe Mean?

https://www.youtube.com/watch?v=qoRkUzBeJsU&t=10s&ab_channel=CloserToTruth

#Philosophy #PhilosophyOfCosmology #Cosmology #PhilosophyOfScience #Science #Astronomy #Astrophysics #BigBang #Expansion #ExpandingUniverse #ScalarFields #Gravity #Einstein #GR #GeneralRelativity #CosmologicalConstant #DarkEnergy #DarkMatter #CrisisInCosmology #BigRip #BigCrunch #CloserToTruth #RobertKuhn

#ICYMI: The first test images from #ESA’s #Euclid mission have just been released, providing a sneak peek into the incredible discoveries that await us from this groundbreaking mission to explore the composition and evolution of the #DarkUniverse.

More information: https://www.esa.int/Science_Exploration/Space_Science/Euclid/Euclid_test_images_tease_of_riches_to_come

#SpaceMastodon #Space #AstronomyMastodon #Astrodon #Astronomy #ScienceMastodon #Science #DarkMatter #DarkEnergy #Universe

Stay up to date with the latest developments of #ESA’s #Euclid mission by visiting the official Euclid page and discover more about this exciting project and its groundbreaking discoveries: https://www.esa.int/Science_Exploration/Space_Science/Euclid

#SpaceMastodon #Spacedon #Space #AstronomyMastodon #Astrodon #Astronomy #ScienceMastodon #Sciencedon #Science #EuclidMission #DarkMatter #DarkEnergy #DarkUniverse #Universe

The first engineering images from #ESA’s #Euclid mission are set to be released on Monday (July 31, 2023), which will provide new insights into the mysteries of the cosmos. The goal is to help us understand the nature of dark matter and dark energy, and how they impact the course of the universe.

#SpaceMastodon #Spacedon #Space #AstronomyMastodon #Astrodon #Astronomy #ScienceMastodon #Sciencedon #Science #EuclidMission #DarkMatter #DarkEnergy #DarkUniverse #Universe

The state of the #DarkEnergy #EquationOfState circa 2023: https://arxiv.org/abs/2307.14802 -> "We deem the combination of Planck CMB, Baryon Acoustic Oscillations, Type Ia Supernovae, and Cosmic Chronometers data to be particularly trustworthy, inferring from this final consensus dataset w=−1.013+0.038/−0.043, in excellent agreement with the #CosmologicalConstant value. Overall, despite a few scattered hints, we find no compelling evidence forcing us away from the cosmological constant (yet)."

#ESA’s #Euclid mission launched today on a #SpaceX #Falcon9 rocket. The space telescope is headed to Sun-Earth L2, 1.5 million km from Earth, to survey the sky and uncover the mysteries of dark matter and dark energy. Below are actual launch and deployment photos.

For updates and more information, visit https://esa.int/euclid

#SpaceMastodon #Spacedon #Space #AstronomyMastodon #Astrodon #Astronomy #ScienceMastodon #Sciencedon #Science #SpaceTelescopes #DarkMatter #DarkEnergy #DarkUniverse

Congratulations to the team that make up the #Euclid mission on their successful launch! We can't wait to see what mysteries of the dark universe this space telescope will uncover.

For updates and more information, visit the official Euclid website: https://www.esa.int/Science_Exploration/Space_Science/Euclid

#SpaceMastodon #Spacedon #Space #AstronomyMastodon #Astrodon #Astronomy #ScienceMastodon #Sciencedon #Science #ESA #ESAEuclid #SpaceTelescopes #DarkMatter #DarkEnergy #DarkUniverse

#PaulSteinhardt - How Does #DarkEnergy Drive the #Universe?

https://www.youtube.com/watch?v=VcACmz53LpU&ab_channel=CloserToTruth

#Physics #Science #Cosmology #PhilosophyOfScience #PhilosophyOfCosmology #BigBang #MassEnergy #CosmologicalConstant #GR #GeneralRelativity #GalaxyFormation #CloserToTruth #RobertKuhn

And talking about the #CosmologicalConstant and its revival 25 years ago ... here comes the paper "Casimir Self-Interaction Energy Density of Quantum Electrodynamic Fields": https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.130.041601#fulltext -> A new approach for solving the #darkenergy mystery: https://wwwen.uni.lu/universitaet/aktuelles/topthema/ein_neuer_ansatz_zur_loesung_des_raetsels_um_die_dunkle_energie