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Possibilities for a 5th force?

by Gerinski
Tags: force, possibilities
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Gerinski
#1
Jul15-14, 09:30 AM
P: 128
It is quite accepted that at sufficiently high energies 3 of the known 4 forces merge into 1 fundamental force, and it is expected by many that at even higher energies gravity should also merge with them into a single primordial force. We find ourselves in an energy period of the universe where the primordial superforce has split into 4 by different symmetry breaks.

But taking the other way, towards the future and even lower energies than current, has anybody ever speculated that a new symmetry breaking could occur creating a lower energy 5th force? Why should the splitting stop at 4?
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UltrafastPED
#2
Jul15-14, 11:39 AM
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PF Gold
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P: 1,908
All experimental tests of "fifth force" have failed, but cosmologists persist!

See https://en.wikipedia.org/wiki/Fifth_force
and http://www.sciencedaily.com/releases...0221192736.htm

This goes to show that once an idea appears on the horizon, it never disappears!
Gerinski
#3
Jul15-14, 12:16 PM
P: 128
Quote Quote by UltrafastPED View Post
All experimental tests of "fifth force" have failed, but cosmologists persist!

See https://en.wikipedia.org/wiki/Fifth_force
and http://www.sciencedaily.com/releases...0221192736.htm

This goes to show that once an idea appears on the horizon, it never disappears!
Thanks those are nice. My question though was rather not so much whether we currently have a yet undetected 5th force (which is surely interesting enough) but whether we may just have 4 forces now but with further dilution of the energy in the future a new symmetry breaking could take place giving rise to a not-yet existing force.

mathman
#4
Jul15-14, 03:20 PM
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P: 6,057
Possibilities for a 5th force?

I don't know if anyone is specifically looking for a fifth force. However many lab experiments take place at temperatures close to absolute zero, so I suspect there is no such force.
Chronos
#5
Jul15-14, 04:30 PM
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PF Gold
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You could make a case for dark energy as a fifth force. Scientists are fairly convinced it exists, but, have little clue what it is, how it interacts, or its mediating particle. Not that we know all that much more about gravity. The graviton is the hypothetical mediating particle for gravity, but, has never been experimentally detected.
AlephZero
#6
Jul15-14, 05:24 PM
Engineering
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Not my specialist subject, but it seems strange that string theorists can only postulate of one more force. Can't they come up with an reason why there should be at least 37?
echaniot
#7
Jul17-14, 10:37 PM
P: 3
Hello there,
there is a nice book speaking of the tests conducted on the hypothesis of a fifth force.
http://www.amazon.com/Rise-Fall-Fift.../dp/1563961199

There is research going on on some new experiments (At JLab and GSI), where they try to detect some new gauge bosons A' (popularly named dark photons) which could be mediators of a new fifth force acting on dark matter. (if i get it correctly)
http://www.nature.com/news/physicist...forces-1.10386
Gerinski
#8
Jul18-14, 01:55 AM
P: 128
Thanks!


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