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What is the Universe expanding into..
What is the Universe expanding into..
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View Poll Results: Do you think there was anything before the big bang?
I don't think there was anything before the Big Bang 23 9.50%
I think something existed before the Big Bang 100 41.32%
I don't think the big bang happened 27 11.16%
I think the universe is part of a mutiverse 117 48.35%
Multiple Choice Poll. Voters: 242. You may not vote on this poll

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Old 24th November 2020, 10:44 PM   #4081
Bonsai is online now Bonsai  Europe
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What is the Universe expanding into..
Indeed, that’s the Newtonian view. But I wonder if at a more fundamental level something else is going on.
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Old 24th November 2020, 10:45 PM   #4082
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Every parameter can be designated as a dimension. The question arises: what is pointless unnecessity? The time dimension in Einstein`s theory, for instance?

Last edited by N101N; 24th November 2020 at 10:48 PM.
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Old 24th November 2020, 11:13 PM   #4083
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Velocity involves a time dimension.

The notion of mass times velocity is much older than that. Newton did not invent anything, he took everything from others.
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Old 25th November 2020, 12:20 AM   #4084
system7 is online now system7  United Kingdom
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You know I yak on about 1729 as being extremely interesting.

Reason is it comes back to my old 4D buddy Felix Klein. And his j-invariant:

j-invariant - Wikipedia

163 is also extremely interesting as the complex power of the exponential number e. The largest Heegner number.

Regardless, we have the current SI units:

The seven defining constants of the SI are:

the caesium hyperfine frequency DeltanuCs;
the speed of light in vacuum c;
the Planck constant h;
the elementary charge e;
the Boltzmann constant k;
the Avogadro constant NA; and
the luminous efficacy of a defined visible radiation Kcd.

I don't think there is any escaping Time as being a big contender as fundamental. Charge seems to be a player too:

tenfold

The Planck constant links it to the correct Quantum Theory.

You guys know I like Information Theory too. Well, that involves Time too. So Time is definitely a contender.
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Old 25th November 2020, 09:09 AM   #4085
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All system units defined from 7 physics constants.
Could that mean our universe has seven dimensions ?
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Old 25th November 2020, 11:12 AM   #4086
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I'm not sure. Just laying out the issue:

I was in a muddle about the SI system. The SI base units are:

s, second, time
m, metre, length
kg, kilogram , mass
A, ampere, electric current
K, kelvin, thermodynamic temperature
mol, mole, amount of substance
cd, candela, luminous intensity

With combinations of those you can build everything else using equations.
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Old 25th November 2020, 11:44 AM   #4087
system7 is online now system7  United Kingdom
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Apparently you can choose lots of base units.

Mass, Length and Time (MLT) can be equally written as Force, Length and Mass (FLM) in mechanics.

Dimensional analysis - Wikipedia

So it's hard to say what is fundamental.
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Old 25th November 2020, 11:55 AM   #4088
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What is the Universe expanding into..
amount of substance and luminous intensity are suspicious in that context?

//
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Old 25th November 2020, 03:04 PM   #4089
system7 is online now system7  United Kingdom
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s, second, time. We know what that is.
m, metre, length. That one is straightforward too. Though I still think in similar yards. 22 yards is the length of a cricket pitch.
kg, kilogram , mass. A bag of sugar.
A, ampere, electric current. Can also be defined as the unit of charge, the Coulomb per second.

(I didn't know this but a 1F capacitor given a coulomb of charge is raised 1 volt. An AA battery delivers about 5000 coulombs in its life. And an average lightning bolt is 15 coulombs. An Electron is 1.6 X 10^ -19 Coulombs. )

K, kelvin, thermodynamic temperature. OK with that one. Freezing point of water is 273K. We call it 0C Celsius. 32F in America.

mol, mole, amount of substance. 6X 10^23 atoms in a gram of Hydrogen. Dimensionless.
cd, candela, luminous intensity. Apparently a candle at 1 foot. Bit old-fashioned.

Yes, the last two are useful in certain subjects but not really fundamental.
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Last edited by system7; 25th November 2020 at 03:27 PM. Reason: usual tidy up for precision. LOL.
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Old 25th November 2020, 05:12 PM   #4090
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We discussed SI defining constants and dimensional analysis way back around page 308 - see your post #3073!
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