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Newsgroups: sci.physics.relativity
Subject: Re: Time Dilation Can Only be Detected at Velocities Close to the Speed of Light
From: nospam@de-ster.demon.nl (J. J. Lodder)
Reply-To: jjlxa32@xs4all.nl (J. J. Lodder)
Date: Sun, 17 Nov 2024 22:31:54 +0100
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ProkaryoticCaspaseHomolog <tomyee3@gmail.com> wrote:

> On Sun, 17 Nov 2024 19:03:25 +0000, J. J. Lodder wrote:
> 
> > Mikko <mikko.levanto@iki.fi> wrote:
> >
> >> On 2024-11-15 21:52:05 +0000, LaurenceClarkCrossen said:
> >>
> >>> Time Dilation Can Only be Detected at Velocities Close to the Speed of
> >>> Light
> >>
> >> Is one tenth of c close? At that speed time dilation is easy to observe.
> >>
> >> Time dilation is observed at the speed of an aeroplane.
> >>
> >> Oscillators currently studied in laboratories will in near future permit
> >> the detection of time dilation at walking speed.
> >
> > Amost  there:
> > 0.3 meter of altitude is equivalent to about 9 km/h in speed.
> > More than walking, but already less than running,
> 
> Clock with 8?10^?19 Systematic Uncertainty
> Alexander Aeppli, Kyungtae Kim, William Warfield, Marianna S.
> Safronova, and Jun Ye
> Phys. Rev. Lett. 133, 023401 – Published 10 July 2024
> https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.133.023401
> 
> For a semi-popular account:
> Reducing Uncertainty in an Optical Lattice Clock
> Han-Ning Dai and Yu-Ao Chen
> July 29, 2024• Physics 17, 118
> https://physics.aps.org/articles/v17/118

Yes, but 30 cm altitude difference
is what has been demonstrated already.
Again, c^2 = 9x10^16,
so a clock stability of 10^18 corresponds to an altitude resolution
of about 1 cm, [1]

Jan

[1] See that Wikipedia article on chronometric leveling
(aka relativistic geodesy) that needs to be written.