Live and recent posts from across the Fediverse tagged #expansion-of-the-universe, aggregated by home.social.
The universe might not be expanding as we thought, study says
We might be very wrong about the expansion of the universe, according to a new paper. For decades,…
#NewsBeep #News #Science #AU #Australia #expansionoftheuniverse #NobelPrizeinPhysics
https://www.newsbeep.com/au/757707/
Scientists Just Confirmed One of the Greatest Mysteries of Our Universe. Now What?
Why the Hubble Tension Remains So PuzzlingAndriy Onufriyenko – Getty Images Here’s what you’ll learn when you read…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Science #astronomicalobservation #cosmicmicrowavebackground #EdwinHubble #expansionoftheuniverse #HubbleConstant #internationalcollaboration #measurements #observationalerror #standardcandle
https://www.newsbeep.com/us/589224/
Outer Space Is a Viscous Fluid, New Paper Claims
There’s endless debate among cosmologists about what really makes up the emptiness of outer space, though many believe…
#NewsBeep #News #Space #AU #Australia #cosmologicalconstant #Darkenergy #darkmatter #expansionoftheuniverse #GreekletterLambda #IndianInstituteofTechnology #intriguingtheory #MuhammadGhulamKhuwajahKhan #OuterSpace #Science #viscousfluid
https://www.newsbeep.com/au/438533/
Outer Space Is a Viscous Fluid, New Paper Claims
There’s endless debate among cosmologists about what really makes up the emptiness of outer space, though many believe…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Science #cosmologicalconstant #DarkEnergy #Darkmatter #expansionoftheuniverse #GreekletterLambda #IndianInstituteofTechnology #intriguingtheory #MuhammadGhulamKhuwajahKhan #OuterSpace #viscousfluid
https://www.newsbeep.com/us/420775/
A New Theory Says Hidden Dimensions May Create Mass. That Would Rewrite Particle Physics.
Here’s what you’ll learn when you read this story: Current theories suggest that W and Z bosons acquire…
#NewsBeep #News #Physics #AU #Australia #expansionoftheuniverse #scalarfield #Science #Spacetime #universalfield
https://www.newsbeep.com/au/386147/
https://www.europesays.com/uk/668269/ A New Theory Says Hidden Dimensions May Create Mass. That Would Rewrite Particle Physics. #ExpansionOfTheUniverse #Physics #ScalarField #Science #spacetime #UK #UnitedKingdom #UniversalField
A New Theory Says Hidden Dimensions May Create Mass. That Would Rewrite Particle Physics.
Here’s what you’ll learn when you read this story: Current theories suggest that W and Z bosons acquire…
#NewsBeep #News #Physics #expansionoftheuniverse #scalarfield #Science #Spacetime #UK #UnitedKingdom #universalfield
https://www.newsbeep.com/uk/347528/
https://www.europesays.com/ie/262660/ A New Theory Says Hidden Dimensions May Create Mass. That Would Rewrite Particle Physics. #Éire #ExpansionOfTheUniverse #IE #Ireland #Physics #ScalarField #Science #Spacetime #UniversalField
On Cosmography (and going Mainstream)
On Friday I attended a colloquium in the Physics Department at Maynooth University by Asta Heinesen of the Niels Bohr Institute in Copenhagen. The talk had the title of Cosmography of the local Universe, as shown on the first slide:
Asta talked about a very interesting programme of work that takes a different approach from most of modern cosmology in that it avoids making the prior assumption of global homogeneity and isotropy embodied by the Friedmann–Lemaître–Robertson–Walker metric. In particular, instead of assuming the isotropic expansion of the Universe, it tries to determine its properties directly using only such measurements as luminosity distances and redshifts. This method is not entirely model-independent because it does assume Lorentz invariance and the conditions required for the Etherington Reciprocity Theorem to hold, but it does not assume any particular form of the metric, so can be applied on scales where the distribution of matter is inhomogeneous and isotropic, e.g. in our local neighbourhood.
To apply this “metric-free” idea one has to construct as general as possible description of the kinematic properties of the underlying matter flow, allowing the global expansion to be anisotropic, and for there to be both rotation and shear. Obviously one would need a large number of measurements to extract anything like a full description of the matter flow, so generally one is restricted to deriving the low-order multipoles (monopole. dipole and quadrupole) as well as the observer’s velocity with respect to the large-scale matter flow.
I found Asta Heinesen’s seminar very stimulating in itself, but it was also nice to see that one of the papers on which it was based is published in the Open Journal of Astrophysics:
When I checked it, I found it was published on my birthday! Here is the overlay:
I announced it on this blog here.
I freely admit that I feel quite proud to have played a small part in helping to get such interesting work published. I’m seeing more and more papers referenced like this, actually. I was reminded of the recent announcement of this year’s list of MacArthur Fellows. among them Kareem El-Badry who has published quite a few papers with the Open Journal of Astrophysics. His biography on the MacArthur Foundation page includes this:
He has published articles in Monthly Notices of the Royal Astronomical Society, The Astrophysical Journal, and The Open Journal of Astrophysics, among other leading scientific journals.
I’m pleased to see us listed with the established names. I mention this just in case there are still people out there who think it might damage their career if they publish with a non-mainstream journal. We are mainstream now…
#AstaHeinesen #cosmography #Cosmology #expansionOfTheUniverse #TheOpenJournalOfAstrophysics
Physicists Predict When The Universe Will End in a Reverse Big Bang
If recent discoveries that dark energy is evolving hold any water, our Universe will collapse under its own…
#NewsBeep #News #Physics #AU #Australia #BigCrunch #cosmologicalconstant #Darkenergy #expansionoftheuniverse #HenryTye #Science #TheUniverse
https://www.newsbeep.com/au/199127/
Black holes that transform matter into dark energy could solve ‘cosmic hiccups’ mystery
When you buy through links on our articles, Future and its syndication partners may earn a commission. An…
#NewsBeep #News #Space #AU #Australia #Blackhole #CCBH #Darkenergy #desi #energybudget #expansionoftheuniverse #Science
https://www.newsbeep.com/au/93840/
Weekly Update from the Open Journal of Astrophysics – 02/08/2025
It’s Saturday morning again, and it’s the start of a new month, so it’s time for an update of papers published at the Open Journal of Astrophysics. Since the last update we have published five new papers, which brings the number in Volume 8 (2025) up to 110, and the total so far published by OJAp up to 345. I expect we’ll the total number we published last year (120) sometime this month. I predict that by the end of this year we will have published around 180 papers in Volume 8 and around 400 altogether.
The papers published this week, with their overlays, are as follows. You can click on the images of the overlays to make them larger should you wish to do so.
The first paper to report is “The matter with(in) CPL” by Leonardo Giani (U. Queensland, Australia), Rodrigo Von Marttens (Universidade Federal da Bahia, Brazil) and Oliver Fabio Piattella (Universita degli Studi dell’Insubria, Italy). This was published on Monday 29th July 2025 in the folder Cosmology and Nongalactic Astrophysics. This article presents a new parameterization of the standard model and its implications for the interpretation of cosmological observations.
The overlay is here:
The officially-accepted version can be found on arXiv here.
The second paper of the week, published on Tuesday 30th July in the folder Instrumentation and Methods for Astrophysics, is “An automated method for finding the most distant quasars” by Lena Lenz, Daniel Mortlock, Boris Leistedt & Rhys Barnett (Imperial College London, UK) and Paul C. Hewett (U. Cambridge, UK)”. This paper presents an automated, reproduceable and objective high-redshift quasar selection pipeline, tested on simulations and real data from the Sloan Digital Sky Survey (SDSS) and UKIRT Infrared Deep Sky Survey (UKIDSS). The overlay is here:
You can find the officially accepted version of the paper on arXiv here.
The third paper of the week is “Early Post Asymptotic Giant Branch Instability: Does it Affect White Dwarf Hydrogen Envelope Mass?” by James MacDonald (University of Delaware, USA). This one was published on Friday 1st Auguest (i.e. yesterday) in the folder Solar and Stellar Astrophysics. It is an investigation into whether Early Post AGB Instability (EPAGBI) can affect determinations of the total abundance of hydrogen in white dwarf stars.
The overlay is here:
The final version is on arXiv here.
The fourth paper of the week, also published on Friday 1st August, is “Light Echoes of Time-resolved Flares and Application to Kepler Data” by Austin King and Benjamin C. Bromley (University of Utah, USA). This describes a new model for circumstellar disks that incorporates echoes produced by extended, time-resolved flares. It is published in the folder Solar and Stellar Astrophysics. Here is the overlay:
You can find the officially-accepted version on arXiv here.
The fifth and final article published this week, also published on Friday 1st August, is “Wide Binaries from Gaia DR3 : testing GR vs MOND with realistic triple modelling” by Charalambos Pittordis, Will Sutherland and Paul Shepherd (Queen Mary, University of London, UK). This presents a test for modified gravity from a sample of wide-binary stars from Gaia DR3, finding that (unmodified) Newtonian gravity provides a better fit to the data. It is in the folder Astrophysics of Galaxies.
The overlay is here:
You can find the officially-accepted version on arXiv here.
And that’s all the papers for this week. I’ll do another update next Saturday.
#AGBStars #arXiv240812770v2 #arXiv250407569v2 #arXiv250508467v3 #arXiv250508921v2 #arXiv250513313v2 #AstrophysicsOfGalaxies #AsymptoticGiantBranch #binaryStars #circumstellarDisks #Cosmology #CosmologyAndNonGalacticAstrophysics #DarkEnergy #DiamondOpenAccess #expansionOfTheUniverse #GaiaD3 #InstrumentationAndMethodsForAstrophysics #Kepler #ModifiedNewtonianDynamics #MOND #OpenAccessPublishing #OpenJournalOfAstrophysics #PostMainSequenceEvolution #protoplanetaryDisks #quasars #stellarFlares #TheOpenJournalOfAstrophysics #WideBinaries #YoungStellarSystems
https://www.europesays.com/uk/299585/ A Radical New Theory Has Scientists Rethinking the Origins of the Universe #DarkMatter #DeSitter #ExpansionOfTheUniverse #inflaton #ModelOfTheUniverse #Physics #Quantum #Science #UK #UnitedKingdom
A Radical New Theory Has Scientists Rethinking the Origins of the Universe
A new theory for the origin of the universe proposed by scholars at the University of Padua, University…
#NewsBeep #News #Physics #darkmatter #deSitter #expansionoftheuniverse #inflaton #modeloftheuniverse #Quantum #Science #UK #UnitedKingdom
https://www.newsbeep.com/uk/29603/
A Radical New Theory Has Scientists Rethinking the Origins of the Universe
A new theory for the origin of the universe proposed by scholars at the University of Padua, University…
#NewsBeep #News #Physics #AU #Australia #darkmatter #deSitter #expansionoftheuniverse #inflaton #modeloftheuniverse #Quantum #Science
https://www.newsbeep.com/au/28430/
A Radical New Theory Has Scientists Rethinking the Origins of the Universe
A new theory for the origin of the universe proposed by scholars at the University of Padua, University…
#NewsBeep #News #Space #CA #Canada #darkmatter #deSitter #expansionoftheuniverse #inflaton #modeloftheuniverse #Quantum #Science
https://www.newsbeep.com/ca/30255/
Study: Conflicting values for Hubble constant not due to measurement error - Enlarge / This image of NGC 5468, about 130 million light-years from Ea... - https://arstechnica.com/?p=2009332 #expansionoftheuniverse #hubbleconstant #webbtelescope #astrophysics #science
If the universe is only 14 billion years old, how can it be 92 billion light years wide?