[General] [NEW] SRT twin Paradox

[Chip Akins]

Hi Grahame

 

But there is a point we need to consider.  A body in motion is in an inertial frame, whether the motion is linear or is very slightly curved depends on whether there is a transverse acceleration. The presence of a very slight transverse acceleration does not cancel the inertia of the body, or erase the existence of an “inertial frame” but it does slightly alter that frame with time.

 

So a slightly changing inertial frame is still an inertial frame, but in order to fully evaluate the small effect of curvature, in such a case, we have to use a more complete formulation of relativity.

 

I understand this very well.  I also understand that when one changes the discussion to avoid the issue at hand, that I am probably wasting my time.

 

Chip

 

From: General [mailto:general-bounces+chipakins=gmail.com at lists.natureoflightandparticles.org] On Behalf Of Dr Grahame Blackwell
Sent: Friday, September 01, 2017 5:49 AM
To: Nature of Light and Particles - General Discussion <general at lists.natureoflightandparticles.org>
Subject: Re: [General] [NEW] SRT twin Paradox

 

Sorry Chip, but you're not going to dislodge Relativity like that.

 

Under Relativity circular motion is NOT absolute - I have most definitely 'questioned that' in my last several emails.  The whole point of my recent missives is to make it clear that Relativity allows a person undergoing circular motion to consider themselves at rest - and that view is as valid as any other, under Relativity.

 

That's why GR then has to come into it.  Because even whilst considering themselves to be at rest, that person will experience a force - and GR allows them to regard that force as a gravitational effect (and considers that as valid a view as any other).

 

The whole point of GR was to extend 'relativity' to non-inertial frames - so to claim that a non-inertial frame is 'absolute' and then extent that to embrace SR is a complete misunderstanding of Relativity.

 

Sorry!

 

Grahame

 

----- Original Message ----- 

From: Chip Akins <mailto:chipakins at gmail.com>  

To: 'Nature of Light and Particles - General Discussion' <mailto:general at lists.natureoflightandparticles.org>  

Sent: Friday, September 01, 2017 11:38 AM

Subject: Re: [General] [NEW] SRT twin Paradox

 

Hi All

 

We have discussed the “twin paradox” and many have said that there is no paradox. But using SRT alone this is not strictly true.  The postulate that “all motion is relative” is an arbitrary and so far experimentally unsupported part of SRT. This postulate alone causes a paradox.

 

But there is another way to consider these issues

 

We have established that circular motion is absolute, and no one has questioned that, because we have experimentally been able to verify that is the case.

 

Now let us take that circular motion toward the limit, and continue to enlarge the radius of that motion.  Still, no matter how large the radius, circular motion is absolute. At what point, at how large a radius, would you say that the laws of motion change from absolute to relative?

 

The fact is, the laws of motion do not change from absolute to relative, even if the radius is so large that we cannot measure the curvature. All motion is not relative.

 

Chip

 

 

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