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New Evidence Against the Standard Model of Cosmology

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Re: New Evidence Against the Standard Model of Cosmology

#21

Post by varjag »

shmageggy wrote: post #19

Any time dissenting physics/astronomy opinions show up on here, it's always Sabine Hossenfelder. Is she a lone wolf or the face of a larger community?

She's a new kind of popular science presenter, with refreshing depth and command of the subject that's been lacking in this field for ages. She's popular and popular content is getting HN front page often. Add here the dynamics of social media engagement, meaning that more disputed/controversial topics get promoted and shared more.

As a physicist she does have certain opinions (would be strange if she didn't), they make for good material so naturally she brings it up. The disputed subjects however are a fraction of her content, which includes covering the well established basics.

Re: New Evidence Against the Standard Model of Cosmology

#22

Post by swhalen »

shmageggy wrote: post #19

Any time dissenting physics/astronomy opinions show up on here, it's always Sabine Hossenfelder. Is she a lone wolf or the face of a larger community?

I think it's probably fair to say most cosmologists would consider her views marginal, but she is certainly not a crank. My (limited) understanding is that ΛCDM fits cosmological observations extremely well; however, neither dark matter nor dark energy has actually been shown unambiguously to exist. 'Mainstream' cosmology invariably also includes inflation, which remains essentially a speculative idea unsupported by any hard observational evidence. Sabine Hossenfelder has become a popular commentator by drawing attention to discussions of these and other issues.

Re: New Evidence Against the Standard Model of Cosmology

#23

Post by teilo »

rich_sasha wrote: post #3

Not knowing much about the subject: cosmological principle appears to say that laws of physics are uniform in space. Then, with known matter and forces, this leads to some structure, with fluctuations, and hence some scale over which matter is uniformly distributed. If we calculate such a scale and find matter is still not uniform at that scale, wouldn’t the first conclusion be that there are missing terms in either…

> Rather than saying that laws of physics are not space-homogeneous.

No one is saying that, and if the cosmological principle falls, it does not imply that in the least. It just means we need to revisit our assumptions about things like hyperinflation, dark matter, etc. Even more exciting, it may mean we need to look for the remnants of a force active during the initial inflation of the universe, that can account for the non-uniformity of matter's distribution.

Re: New Evidence Against the Standard Model of Cosmology

#26

Post by JPLeRouzic »

FridayoLeary wrote: post #17
sahil50 wrote: post #11

Another problem with the standard model is attributing the cosmological redshift to the Doppler effect.

could you pls elaborate on that?

sahil50 posted this 2 months ago:

https://colab.research.google.com/drive/1K1qoUFvqZp1fWbpcKJW...

Re: New Evidence Against the Standard Model of Cosmology

#27

Post by dgellow »

varjag wrote: post #21
shmageggy wrote: post #19

Any time dissenting physics/astronomy opinions show up on here, it's always Sabine Hossenfelder. Is she a lone wolf or the face of a larger community?

She's a new kind of popular science presenter, with refreshing depth and command of the subject that's been lacking in this field for ages. She's popular and popular content is getting HN front page often. Add here the dynamics of social media engagement, meaning that more disputed/controversial topics get promoted and shared more. As a physicist she does have certain opinions (would be strange if she didn't), they m…

Her music videos are also awesome :)

Re: New Evidence Against the Standard Model of Cosmology

#28

Post by andyjohnson0 »

FridayoLeary wrote: post #17
sahil50 wrote: post #11

Another problem with the standard model is attributing the cosmological redshift to the Doppler effect.

could you pls elaborate on that?

I'm not the parent commenter, and I'm not a physicist, but this might be a reference to the non-mainstream theories that are often grouped under the heading of "plasma cosmology".

https://en.m.wikipedia.org/wiki/Plasma_cosmology

Re: New Evidence Against the Standard Model of Cosmology

#29

Post by drran »

teilo wrote: post #25
sahil50 wrote: post #11

Another problem with the standard model is attributing the cosmological redshift to the Doppler effect.

As opposed to what?

As opposed to one of "tired light" models.

Light is not immortal, so it loses some energy with time. E.g. gravitational noise can affect photon energy, or photon can lose some energy to medium due to friction, or photon can lose some energy because of truncation of ideal sinusoidal wave at Planck scale, or speed of light is a bit slower than c (because light arrived 16 seconds later than gravitational waves, when gravitational waves were discovered), thus photon is not frozen in time and expands at very slow rate.

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