When you buy through links on our land site , we may earn an affiliate commission . Here ’s how it function .
Dark energy may have switched direction sometime in the distant past — and this violent modulation may excuse why cosmogonical reflection are n’t add up up , researchers propose in a new paper .
The advanced picture of the evolution of the universe is bang as ΛCDM ( or lambda - CDM ) , fordark energy(represented by the Greek alphabetic character Λ ) and stale dark matter . dour vigour is the deep force push back the speed up expansion of the universe , and colddark matterrefers to the mystic , invisible substance that provides most of the wad of almost every individual galaxy .
An illustration of galaxies curving the fabric of space-time in an expanding universe. A new theoretical paper proposes that cosmic expansion may not be a given — it can abruptly reverse and change strength.
This model has explained a wide kind of notice , such as the deportment of galaxies and cluster , the growth oflarge - scale structures , and the appearance of the cosmic microwave oven background signal . But in recent years , two troubling tensions have popped up .
One such job , known asthe Hubble tension , is a departure in value the present - solar day expansion pace of the cosmos , a numeral known as the Hubble constant . investigation of the distant , early universe seem to be giving estimates significantly blue than probe of the nearby , tardy universe do .
refer : After 2 year in outer space , the James Webb scope has break-dance cosmology . Can it be fixed ?
pertain to this issuance is the 2d problem , bang as the sigma-8 tension . This is a step of how clumpy matter is in the universe , and once again , dissimilar investigation are yield different results .
A cosmic slowdown
Something in the ΛCDM model has to be wrong , but we ’re not sure what . One speculation is that dark zip might be more dynamical than we originally think . In the usual ΛCDM picture , dark energy is a cosmological constant . It stays the same through cosmic history .
But in a recent example that ’s been gain ground pursuit , dark energy changes . And not by a little ; it undergoes a complete stage transition , from decelerating the universe to accelerating the universe .
Now , adding a twist to that theory , a research team has explored the possibility that the phase angle change is even more spectacular . In a paper posted to the preprint serverarXiv in Februarybut not yet peer - refresh , dark energy does n’t just switch signs ; it also deepen strong suit , so that it power an speedup differently than it powers a retardation .
Then , the research worker tested their framework against a blanket kind of observance and datasets . These included the Planck place observatory ’s measurements of the cosmic microwave oven screen background , theoldest light source we can seein the cosmos ; a measurement of a phenomenon called the baryon acoustic oscillation , a pattern in the agreement of galaxies at very with child scales ; the Pantheon dataset of supernova aloofness measure ; and a weak lensing map that provides details account for the effect of colored matter .
— Cosmic voids may explain the universe ’s acceleration without dark energy
— ' Heavy ' coloured issue would rip our understanding of the macrocosm apart , new inquiry suggests
— Something inconspicuous and ' fuzzy ' may mill around at the Milky Way ’s shopping centre , Modern research suggests
They found that the new model alleviated some of the Hubble and sigma-8 tension , and thus they contend that this approach path might be a promising way forward .
That said , the researcher noted that this model is n’t exactly base in have a go at it physics . It ’s just a toy , a way to search the physical outcome of a model without be intimate the underlie physical science . But because it seems like a promising guidance , this attack could motivate theorists to come up with mechanisms to explain how dark energy might switch like this .
No matter what , it appears that the universe — peculiarly morose free energy — is more complicated than we assume .
You must confirm your public display name before commenting
Please logout and then login again , you will then be prompted to enter your showing name .
