🚀 go-pugleaf

On Jun 12, 6:31 pm, jem <x...@xxx.xxx> wrote:
> John Kennaugh wrote:
.........
>> How a mathematical abstraction (a FoR) can posses the same physical
>> properties as the aether and force light to propagate every which way at
>> c when it defines physical space which those same relativists are
>> adamant contains nothing physical - no aether - is absurd.
>
>> I have Tom Roberts in effect saying "never mind the physical, jump in
>> the maths is luverly." The maths works provided you have complete
>> freedom to redefine anything which prevents it from working and you
>> accept the modern view that physical interpretation is not only
>> unnecessary but a singularly bad idea.
>
> The math of *every* physical theory has a direct link to measurement,
> and that link /is/ the "physical interpretation".
>
Do you consider GR to be a physical theory?
If so then where is the direct link of *space curvature* to
measurement?

In reality you can neither physically measure the space curvature nor
describe a technical procedure for measurement of space curvature even
in principle. You cannot even define the space curvature in physical
terms (other than the usual mathematical definition in GR).

I hope you can atleast mentally visualize the space curvature! Can
you??

>
>> If it doesn't work on a physical level - it doesn't work. If there is
>> nothing to cause a physical effect then there cannot be a physical
>> effect. Nothing happens because the maths says so. Things happen because
>> of real physical processes and it is a legitimate aim of physics to try
>> and understand nature not merely to mathematically model it.
>
> What do you think cause-and-effect relationships /are/, Kennaugh,
> other than logical connections between certain behavior of Nature and
> other behavior?  And what do you think physical theories /are/, other
> than devices for inferring certain behavior of Nature from other
> behavior*?
>
Causality denotes a necessary relationship between one event (called
cause) and another event (called effect) which is the direct
consequence (result) of the first. If a certain sequence of events is
not causally connected, that set of events will be referred as random
events. If a sequence of events is causally connected, we may
attribute such causal connection between events to certain physical
law of nature. If appropriate logical explanation is available for the
causal connection between events then such  causal connection plus the
appropriate logical explanation is called a physical theory of the
associated phenomenon.

GSS
http://www.geocities.com/gurcharn_sandhu/index.html