‘Disaster averted’ as consultants affirm universe’s enlargement IS accelerating

Our universe’s enlargement remains to be accelerating regardless of latest claims suggesting in any other case, a world group of astrophysicists say.

They refuted a study published last year claiming the growth of the universe is slowing and demand there isn’t a flaw within the widely-accepted concept {that a} mysterious power often called darkish power is driving the increasing cosmos.

The researchers, who embrace two Nobel Laureates and characterize establishments worldwide, say the talk that adopted final November’s revelations was the results of a scientific misunderstanding somewhat than a cosmic grenade threatening to blow aside the whole lot we all know concerning the universe.

Their paper has been revealed at the moment in Monthly Notices of the Royal Astronomical Society.

It is a direct rebuttal of a examine by a group of South Korean researchers that made the inaccurate declare the universe’s enlargement could have entered a deceleration section, brought on by the affect of darkish power – which acts as a form of anti-gravity – weakening over time.

“The previous and well accepted measurements were, in fact, fine and our current understanding of the fate of the universe remains robust,” mentioned lead creator Dr Phil Wiseman, from the University of Southampton.

“Thankfully we now have averted this disaster, however the thriller about why the speed of enlargement of the universe remains to be accelerating stays.

“By proving our measurements are correct, we can get back to trying to understand what this dark energy actually is, rather than wondering if it exists at all.”

The worldwide group of researchers concerned within the new examine included Professor Adam Riess and Professor Brian Schmidt, who gained the 2011 Nobel Prize in Physics alongside Professor Saul Perlmutter.

The trio studied Type Ia supernovae – violent, luminous white dwarf star explosions – and decided that extra distant objects appeared to maneuver sooner, resulting in their conclusion that the universe’s enlargement was accelerating.

This has been the globally-accepted concept ever since, though final yr’s analysis by the South Korean group threatened to upset the apple cart. It claimed that, because the universe aged, these supernovae had totally different most brightnesses, tricking astronomers into pondering the cosmos was accelerating when it was the truth is slowing.

But the University of Southampton-led researchers discovered an error in how the age of those stars was estimated. They say the earlier findings incorrectly assumed the age of a galaxy was the identical because the age of the star that exploded.

The consultants additionally mentioned the South Korean paper did not account for the mass of host galaxies, a typical correction utilized in fashionable cosmology to show accuracy.

Professor Riess added: “Extraordinary claims require particularly cautious testing.

“What we find is that when we calibrate these supernovae, accounting for different host environments and populations, the evidence for cosmic acceleration remains remarkably consistent.”

Professor Mark Sullivan, additionally from the University of Southampton, mentioned difficult accepted theories and observations was basic to science.

“This is how progress is made. Although this idea did not turn out to be correct, it has opened up new ways of thinking about how supernovae explode and how we can measure dark energy more accurately,” he added.

Fellow co-author Dr Brodie Popovic agreed. “We’ve recently been really focused on astrophysics of the explosions and how they impact cosmology,” he mentioned.

“This was a good opportunity to go back and go over all of our assumptions – it turns out, yes, we do understand this stuff and we’re accounting for it in our cosmology measurement.”

ENDS

Media contacts

Sam Tonkin

Royal Astronomical Society

Mob: +44 (0)7802 877 700

[email protected]

James Haigh

University of Southampton

Mob: +44 (0)7584 368684

[email protected]

Science contacts

Dr Phil Wiseman

University of Southampton

[email protected]

Dr Brodie Popovic

University of Southampton

[email protected]

Images & video

Supernova

Caption: Studying Type Ia supernovae – violent, luminous white dwarf star explosions – led to the Nobel Prize-winning discovery that the universe’s enlargement is accelerating. This picture combines knowledge from 4 area telescopes to create a multi-wavelength view of all that is still of RCW 86, the oldest documented instance of a supernova.

Credit: X-ray: NASA/CXC/SAO & ESA; Infared: NASA/JPL-Caltech/B. Williams (NCSU)

Type Ia supernova animation

Caption: This animation exhibits the explosion of a Type Ia supernova, the place the white dwarf’s gravity steals materials away from a close-by stellar companion till it will probably now not maintain its personal weight and blows up.

Credit: NASA/JPL-Caltech

Further data

The paper ‘Still Accelerating: Type Ia supernova cosmology is robust to host galaxy age evolution‘ by Wiseman et al. has been revealed in Monthly Notices of the Royal Astronomical Society. DOI: 10.1093/mnras/stag797. For a sophisticated copy of the paper, please e-mail [email protected]

Notes for editors

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