The galactic clock

[PB666]

Apparent 1.1E20 sec is the time it takes for any spiral galaxy (an exterior point) to make on revolution.

http://blogs.discovermagazine.com/d-brief/2018/03/14/galaxies-rotate-billion-years/#.WqnRW-ch2Ul

This disclamer is that its not as good as a swiss watch, though I seriously doubt switzerland or watches will be around in a billion years to compare with.

 

Edit: sorrry left out a term.

Edited March 15, 2018 by PB666

[YNM]

Wait, so they're constant regardless of size ?  What about the constant spiral velocity stuff ?

[Kerbart]

14 minutes ago, PB666 said:

Apparent 3.5E16 sec is the time it takes for any spiral galaxy (an exterior point) to make on revolution.

If only it could be written in a notation that is mathematically more accepted, like 3.5×10¹⁶ but I have to assume the forum software doesn't support that.

The article raises more questions than it answers. So does the discovery, I guess.

[PB666]

3 minutes ago, Kerbart said:

If only it could be written in a notation that is mathematically more accepted, like 3.5×10¹⁶ but I have to assume the forum software doesn't support that.

The article raises more questions than it answers. So does the discovery, I guess.

I does, like what is the Royal Astronomical Society and what are their credentials.

[YNM]

29 minutes ago, Kerbart said:

If only it could be written in a notation that is mathematically more accepted, like 3.5×10¹⁶ ...

If you can do it on this bloody WYSIWYG editor from mobile I'll give two likes.

 

But seriously, does this have any implication on the "flat" rotation curve, or how quickly does it happen ? Can it be used to tell that time has slowed down / speed up over the eons ? (at least one of my lecturer had thought of that)

[PB666]

2 hours ago, YNM said:

If you can do it on this bloody WYSIWYG editor from mobile I'll give two likes.

 

But seriously, does this have any implication on the "flat" rotation curve, or how quickly does it happen ? Can it be used to tell that time has slowed down / speed up over the eons ? (at least one of my lecturer had thought of that)

Im going to wait for the dust to settle on this hypothesis. Possibly true but sounds a bit fantastic. Maybe it has to do with something else, like the time interval between collisions of major galaxies.

[YNM]

28 minutes ago, PB666 said:

Im going to wait for the dust to settle on this hypothesis. Possibly true but sounds a bit fantastic.

This could imply either some sort of new property of dark matter, or sets the tune to a new modified Newtonian gravity.

[kerbiloid]

Spoiler

5 hours ago, PB666 said:

3.5E16 sec is the time it takes for any spiral galaxy (an exterior point) to make on revolution.

 

[Green Baron]

6 hours ago, PB666 said:

Apparent 3.5E16 sec is the time it takes for any spiral galaxy (an exterior point) to make on revolution.

http://blogs.discovermagazine.com/d-brief/2018/03/14/galaxies-rotate-billion-years/#.WqnRW-ch2Ul

This disclamer is that its not as good as a swiss watch, though I seriously doubt switzerland or watches will be around in a billion years to compare with.

I am not sure if the original article can be interpreted that way, the interpretation sounds nonsensical to me. What it says is that there is a relationship between radius and rotation for galaxies when looked at in the 21cm (neutral hydrogen) wavelengths. But i have only coarsly browsed it.

http://s3-ap-southeast-2.amazonaws.com/icrar.org/wp-content/uploads/2018/03/13111412/Cosmic-Clocks-Paper.pdf

Our galaxy for example has different rotation speeds. The sun needs ~250My for a roundabout once. The surroundings are slightly different, which makes for a crossing of a spiral arm from time to time.

http://curious.astro.cornell.edu/physics/55-our-solar-system/the-sun/the-sun-in-the-milky-way/207-how-often-does-the-sun-pass-through-a-spiral-arm-in-the-milky-way-intermediate

http://www.messier.seds.org/more/mw_arms.html

So there is a discrepancy between observation of our galaxy and what the "discovermagazine" text states.

Edited March 15, 2018 by Green Baron

[YNM]

19 minutes ago, Green Baron said:

I am not sure if the original article can be interpreted that way, the interpretation sounds nonsensical to me. What it says is that there is a relationship between radius and rotat

Well, the relationship they were giving goes

vrot ~ rmax

Which implies

v = ωr

and

T = 2π/ω

 

So the outermost period, regardless of size, are constant.

[Green Baron]

At the extreme outer edge, where gravity and speeds are low. Maybe. I won't read it all, not enough time :-) If it's important there'll be a discussion soon(tm) :-)

[YNM]

1 hour ago, Green Baron said:

At the extreme outer edge, where gravity and speeds are low.

Flat rotation curves suggested otherwise long long ago.

[Cassel]

So they have finally found Biblical day, universal for entire Universe :-)

[YNM]

IMHO this "constant" could've actually been derrived analytically. Perhaps it'd help in determining other constants ?

Edited March 15, 2018 by YNM

[PB666]

5 hours ago, Green Baron said:

I am not sure if the original article can be interpreted that way, the interpretation sounds nonsensical to me. What it says is that there is a relationship between radius and rotation for galaxies when looked at in the 21cm (neutral hydrogen) wavelengths. But i have only coarsly browsed it.

http://s3-ap-southeast-2.amazonaws.com/icrar.org/wp-content/uploads/2018/03/13111412/Cosmic-Clocks-Paper.pdf

Our galaxy for example has different rotation speeds. The sun needs ~250My for a roundabout once. The surroundings are slightly different, which makes for a crossing of a spiral arm from time to time.

http://curious.astro.cornell.edu/physics/55-our-solar-system/the-sun/the-sun-in-the-milky-way/207-how-often-does-the-sun-pass-through-a-spiral-arm-in-the-milky-way-intermediate

http://www.messier.seds.org/more/mw_arms.html

So there is a discrepancy between observation of our galaxy and what the "discovermagazine" text states.

I did say '"an exterior point"

 

[PB666]

f = w/2π

f = 1/P therefore   w = 2π/P =  5.53 x 10^-20

If hydrogen at an exterior point of a galaxy means that it is akin to the hydrogen being on the surface which is moving with respect .

Its velocity is given by SQRT(µ/r) or alternatively w²r = u/r³ where w = SQRT(µ/r³) = µ^0.5 r^-1.5

r^1.5 = µ^0.5/w

r = (µ^0.5/w)^2/3

Since P is constant, f is constant and since f is constant w is constant. r = 7 x 10¹²µ^0.333333

The mu for earth is 4E14 and the sun is 1.4E20. if the galaxy is say 10¹⁰ times larger then is means that the width of a typical galaxy is roughly 10³³ or 10¹⁷ light years (larger than our visible universe).

Since it is pretty certain that galaxies are not that large we can pretty much argue that what ever particle they have found or our sense is not on the periphery of a galaxies mass. And then if another person with more sensitive equipment is measuring, then they are finding hydrogen further away traveling at a different speed.

Since we cannot observe this and since it is likely that comoving space-time has some constraint on how large galaxies can ever be in size, its relatively easy to postulate that what they are measuring is in dynamic equilibrium of a galaxy and its surrounding space, means that it likely on some sort of aberrant (non-orbital) trajectory with respect to the galaxy.

 

[kerbiloid]

Spoiler

Galaxies are donuts.
The donut itself rotates as a solid body. The cloud of sugar powder follows it like a cloud.

 

[Merlin The Cynic]

On 15/03/2018 at 2:18 AM, PB666 said:

I does, like what is the Royal Astronomical Society and what are their credentials.

They're an official and rather old astronomical society in the UK. They're actually rather big as well

[YNM]

On 15/03/2018 at 9:18 AM, PB666 said:

what is the Royal Astronomical Society and what are their credentials.

... they have the Greenwich Observatory ? Like, "the oldest", and standardized one ? So "old" it's the 0 meridian (at least on British ellipsoid - WGS84 is unfortunately made for the US) ?