How inflation solves the horizon problem

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    Horizon Inflation
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Discussion Overview

The discussion revolves around the horizon problem in cosmology and the proposed solution of inflation theory. Participants share their perspectives on the validity of inflation as a solution, alternative models, and the implications of terminology used in the context of the problem.

Discussion Character

  • Debate/contested
  • Exploratory
  • Technical explanation

Main Points Raised

  • Soph presents a write-up on the horizon problem and inflation, seeking feedback on its accuracy.
  • Some participants express difficulty in accessing the original document and critique the subsequent Word document for lacking diagrams and explanations.
  • Bobbywhy critiques the usefulness of the Word document and emphasizes the importance of self-review before seeking feedback.
  • Several participants affirm that the original write-up makes sense, indicating some support for Soph's explanation.
  • One participant cautions against the use of the term "solved," suggesting that inflation theory is not definitively proven and that alternative models exist, such as emergent space theories.
  • Another participant acknowledges that while inflation may not be the only solution, it is still considered a valid one within the context of the standard cosmological model.
  • Discussion includes mention of other potential solutions to the horizon problem, including variable speed of light models and slow growth models.
  • There is a recognition of the importance of understanding why certain conclusions were reached in past discussions about the horizon problem.

Areas of Agreement / Disagreement

Participants express differing views on the terminology surrounding inflation as a solution to the horizon problem. While some support the notion that inflation addresses the problem, others argue for the existence of alternative models that do not rely on inflation. The discussion remains unresolved regarding the definitive status of inflation theory.

Contextual Notes

Participants highlight limitations in the clarity and accessibility of the documents shared, as well as the need for careful consideration of terminology in scientific discussions. There is also an acknowledgment of the complexity surrounding the horizon problem and its potential solutions.

Soph_the_Oaf
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Hi Guys

I've just made a sheet illustrating the horizon problem and how it is solved by inflation.
I thought it might be handy for anyone interested in it, or having trouble with it. I'd also appreciate it if some of you could check it over and see if there's anything I have gotten wrong.

I did find a thread with a similar title, but it appeared to be talking about the Hubble length when i read into it, rather than the basics like this.

Any feedback would be great cheers

Soph
 

Attachments

  • horizon problem jpg.jpg
    horizon problem jpg.jpg
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Anyone? Just after an opinion as to whether people think what I've written is correct

Cheers
Soph
 
I can't read the thumbnail sheet. Tried to zoom into 200% using my browser (IE) but still unreadable.
 
Soph_the_Oaf said:
Ah sorry, so that's why no one replied! Will try again using the word document instead
Cheers :)

Soph

Soph, Sorry, but that Word document is NOT useful at all. It has no diagrams like your first try, and no explanations of how Inflation solves the Horizon Problem. (It doesn't even pass spellcheck.) Please click on it yourself and see. It's important to check these things yourself first, otherwise you can not expect any constructive criticisms or compliments.

Cheers,
Bobbywhy
 
Soph, I think your original write-up looks good and makes sense.
 
Bobbywhy said:
Soph, Sorry, but that Word document is NOT useful at all. It has no diagrams like your first try, and no explanations of how Inflation solves the Horizon Problem. (It doesn't even pass spellcheck.) Please click on it yourself and see. It's important to check these things yourself first, otherwise you can not expect any constructive criticisms or compliments.

Cheers,
Bobbywhy

Really sorry, i Got confused and uploaded the wrong document. This is the one I meant to upload

Soph
 

Attachments

bapowell said:
Soph, I think your original write-up looks good and makes sense.

Ah only just noticed your reply, so the original image worked, cool :)

Thanks for having a look and giving feedback :D

Soph
 
Be careful how you use the word "solved". You make it sound like inflation theory has been proven.

On the contrary, there are models of spacetime (re: emergent space) that do not require inflation to explain the horizon problem.

Good luck!
 
Its still kind of a solution though, just maybe not the right one. I'm sure that 'there's two possible solutions' could form part of a sentence and is correct English... that implies you can have 'a' solution which isn't the only solution. But yeah, i get what you're saying :D

Variable speed of light is another possibility!

Cheers :)
 
  • #10
euquila said:
Be careful how you use the word "solved". You make it sound like inflation theory has been proven.

On the contrary, there are models of spacetime (re: emergent space) that do not require inflation to explain the horizon problem.

There's nothing wrong with using the word 'solved' here. The standard big bang model had a problem, inflation was put forward and shown to remove this problem, therefore that problem is solved.

There are other solutions, but inflation is now regarded as part of the standard cosmological model because none of the other solutions match observational data to a better extent.
 
  • #11
cristo said:
There are other solutions, but inflation is now regarded as part of the standard cosmological model because none of the other solutions match observational data to a better extent.

It's always useful to come up with a list of alternative explanations and come up with the reason why they didn't work. The two that I know of off hand are slow growth models and variable light speed models.

One problem is that people argue about something, come up with a conclusion, forget why people came up with the conclusion, and argue about it again.
 

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