advice
I'm curious about what you are trying to find out with this
experiment. Certainly it is not to prove that time does in fact
dilate. Are you planning on using time to measure relative
differences in gravity? That seems reasonable because as it turns
out times is the physical quantity that can be measured to the highest
precision. It might be interesting to see how the rate of time
changes as a result of Earthquakes, magma circulating deep underground
or as the moon orbits the earth and the tides change.
I think the record for detecting time dilation using clocks in a 1
meter difference in elevation. I'm sure someone here knows where
this was published.
On Tue, Feb 21, 2017 at 9:13 AM, Rhoderick Beery rjbeery@gmail.com wrote:
Greetings Time-Nuts!
I'm a physics theorist interested in performing an experiment to measure
the gravitational time dilation beneath the surface of the Earth. Boulby
Labs in the UK is 1.1 km down which would generate a time differential from
the surface on the order of 1 part in 10^15 -- not much to work with!
I've investigated measuring redshift/blueshift from lasers but our
wavemeter technology is no where near accurate enough. I've concluded that
my best solution is to use atomic clocks, of which I know very little
about. I thought a clock-enthusiast mail group would be a fantastic way for
me to learn about the subject as well as possibly spur ideas on the lab
test design itself.
Thanks in advance!!
Rhoderick Beery
direct: 402-817-9363
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--
Chris Albertson
Redondo Beach, California
Does gravity work differently under the surface? Maybe the redshift is
different going below the surface.
https://i.stack.imgur.com/yJbbk.jpg
On Wed, Feb 22, 2017 at 3:22 AM, Bill Hawkins bill.iaxs@pobox.com wrote:
In the confusion, I forgot that we are concerned with gravitational time
dilation, not time of flight.
The University of Minnesota has a lab about 2500 feet down in the Soudan
mine. The following is their brief description:
"The Soudan Underground Laboratory is a general-purpose science
facility, which provides the deep underground environment required by a
variety of sensitive experiments."
Here's a link to the Soudan page:
https://www.physics.umn.edu/outreach/soudan/tour/
Why is it named Soudan? The original miners found northern Minnesota to
be extremely cold at times, so they named the town for someplace warm.
Let me know if you are seriously considering this, and I will find a
contact for you.
Bill Hawkins
-----Original Message-----
From: Bill Hawkins [mailto:bill.iaxs@pobox.com]
Sent: Tuesday, February 21, 2017 8:08 PM
Neutrinos? Look up the OPERA experiment that measured neutrinos going
faster than light. Turned out to be a loose optical fiber connector to a
timing instrument.
Fermi Lab has/had the MINOS experiment going 500 miles from Chicago to a
mine in northern Minnesota. The generated neutrinos go through Wisconsin
but are not noticed there, AFAIK.
Bill Hawkins (Resident of Minnesota, but not a physicist, just a BSME)
-----Original Message-----
From: Bob Stewart
Sent: Tuesday, February 21, 2017 1:48 PM
Hi,
Have you been in touch with Fermi-Lab? They run a neutrino experiment
with a receiver somewhere underground in Wisconsin. At least that's
what I recall. I used to live next to a Physics professor who has a
minor part in the experiment. I'm not even sure what sort of data they
collect there; whether it's time or something else.
Bob Stewart (Not a physicist)
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So this is the Pound-Rebka experiment with lasers instead of the original Fe57 gamma rays and Mossbauer effect?
Tim N3QE
Sent from my VAX-11/780
On Feb 21, 2017, at 9:33 PM, Bill Byrom time@radio.sent.com wrote:
Review the theory and results in this paper:
http://science.sciencemag.org/content/329/5999/1630?variant=full-text&sso[1]
For small height changes on the surface of Earth, a clock that is higher
by a distance ∆h runs faster by ...
The gravitational shift corresponds to a clock shift of about 1.1 ×
10−16 per meter of change in height.
Bill Byrom N5BB
On Tue, Feb 21, 2017, at 11:13 AM, Rhoderick Beery wrote:
Greetings Time-Nuts!
I'm a physics theorist interested in performing an experiment
to measure
the gravitational time dilation beneath the surface of the
Earth. Boulby
Labs in the UK is 1.1 km down which would generate a time differential
from
the surface on the order of 1 part in 10^15 -- not much to work with!
Links:
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.