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Science Explorer
Science Explorer
33 w

Observations by DESI Open the Door to Modified Gravity Models
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www.universetoday.com

Observations by DESI Open the Door to Modified Gravity Models

The standard theory of cosmology is based upon four things: the structure of space and time, matter, dark matter, and dark energy. Of these, dark energy is the one we currently understand the least. Within the standard model, dark energy is part of the structure of space and time as described by general relativity. It is uniform throughout the cosmos and expressed as a parameter known as the cosmological constant. But initial observations from the Dark Energy Spectroscopic Instrument (DESI) suggest the rate of comic expansion may vary over time. If further observations reinforce this, it could open up cosmological models to alternatives to general relativity known as modified gravity. In a recent paper on the arXiv, the authors look at one version of modified gravity known as Horndeski’s theory. The theory is based upon a generalization of general relativity. Einstein’s original theory was based upon the principle of equivalence, from which he derived a generalized description of spacetime through what is known as a metric tensor. From this, you can derive the equations of motion for objects in a gravitation field, just as Newton’s laws lead to equations of motion for objects under physical and gravitational forces. General relativity is the simplest model with a metric tensor. Horndeski’s theory is the most general model with a metric tensor and allows for the presence of a uniform scalar field. There are special cases of Horndeski’s theory, such as the Brans-Dicke model and the model of quintessence. Both of these models have been used to describe dark energy in a more general way, as well as dark matter in some cases. While observations of gravitational waves, galactic clustering and cosmic expansion constrain these models to some degree, they don’t entirely rule them out. So far, our data on dark energy isn’t rich enough to distinguish between alternatives. Comparison between standard model and modified gravity. Credit: Chudaykin and Kunz This latest work looks at the DESI results in the context of Horndeski models, specifically looking at how it might address the time-evolution of cosmic expansion suggested by the DESI data. It found that if the time evolution is taken to be correct, then a modified gravity is a better fit than the standard model. The study goes on to show that Horndeski models only work where the time evolution of the scalar field correlates to the proposed time evolution of dark matter. This rules out some Horndeski models that have been used to explain dark matter. Overall, the authors argue that the DESI observations make Horndeski’s theory a viable alternative to general relativity. That is, if the data holds up. The Dark Energy Spectroscopic Instrument is still in its early stages, and we don’t yet know what the final results will be. But it is clear that Einstein’s seat on the theoretical throne isn’t entirely assured, and Horndeski’s theory might just be the one to steal the crown. Reference: Chudaykin, Anton, and Martin Kunz. “Modified gravity interpretation of the evolving dark energy in light of DESI data.” arXiv preprint arXiv:2407.02558 (2024). The post Observations by DESI Open the Door to Modified Gravity Models appeared first on Universe Today.
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Conservative Voices
Conservative Voices
33 w

Jill Biden’s Reaction To Trump At Notre Dame Reopening Sets The Internet On Fire [WATCH]
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www.rvmnews.com

Jill Biden’s Reaction To Trump At Notre Dame Reopening Sets The Internet On Fire [WATCH]

Jill Biden’s Reaction To Trump At Notre Dame Reopening Sets The Internet On Fire [WATCH]
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Survival Prepper
Survival Prepper  
33 w ·Youtube Prepping & Survival

YouTube
Assad Regime Falls | Extremist al-Golani: The New Boss EP333
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Classic Rock Lovers
Classic Rock Lovers  
33 w

Bryan Ferry on the anthem that captures “the feeling of love”
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faroutmagazine.co.uk

Bryan Ferry on the anthem that captures “the feeling of love”

A soul sensation. The post Bryan Ferry on the anthem that captures “the feeling of love” first appeared on Far Out Magazine.
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Classic Rock Lovers
Classic Rock Lovers  
33 w

How many number ones did Quincy Jones produce?
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faroutmagazine.co.uk

How many number ones did Quincy Jones produce?

A stratospheric life and career. The post How many number ones did Quincy Jones produce? first appeared on Far Out Magazine.
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Classic Rock Lovers
Classic Rock Lovers  
33 w

“A little bit racy”: The erotic film that inspired a classic Paul McCartney song
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faroutmagazine.co.uk

“A little bit racy”: The erotic film that inspired a classic Paul McCartney song

The nasty side of Macca. The post “A little bit racy”: The erotic film that inspired a classic Paul McCartney song first appeared on Far Out Magazine.
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Classic Rock Lovers
Classic Rock Lovers  
33 w

“Beyond belief”: Brian May names the greatest modern guitarist
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faroutmagazine.co.uk

“Beyond belief”: Brian May names the greatest modern guitarist

"I can’t do that shit”. The post “Beyond belief”: Brian May names the greatest modern guitarist first appeared on Far Out Magazine.
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Classic Rock Lovers
Classic Rock Lovers  
33 w

“They sort of disappeared”: Jimmy Page on the lost Led Zeppelin album
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faroutmagazine.co.uk

“They sort of disappeared”: Jimmy Page on the lost Led Zeppelin album

The classics lost to time. The post “They sort of disappeared”: Jimmy Page on the lost Led Zeppelin album first appeared on Far Out Magazine.
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Conservative Voices
Conservative Voices
33 w ·Youtube Politics

YouTube
Woke Celebrities Own Trump by Moving to... Authoritarian Countries?
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Intel Uncensored
Intel Uncensored
33 w

The Dementia Myth
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expose-news.com

The Dementia Myth

Doctors in Britain are paid a large cash bonus every time they diagnose dementia. Dr. Vernon Coleman believes the practice is designed to get rid of the elderly. “I suspect that many […]
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