Hi all,
I was asked if I agreed that General Relativity says that spacetime is curved?
Actually I was taught in GR, spacetime becomes curved in response to the effects of matter.
Then told that this curvature in turn affects the behavior of matter.
Sounded stupid then and still does now.
The Earth is spinning in spacetime and that invisible whatever it is, is supposed to affect the Earth.
Some folks have called it Aether with the drag effecting the Earth.
Like a big truck going down the road with the space in it's path curving around it and then coming back together behind the truck.
If you are close enough to the truck that the space closes up behind you that is called drafting and it does not take as much power to maintain your speed.
Racers use it to go faster. When a car is drafting as close as they do the back car is able to go faster and that makes it push the car in front making both cars go faster.
So yes space does curve due to matter moving through it.
How could the space have an effect on that big truck or on the Earth?
There has been some pretty big chunks of rock that has hit the Earth in the past that killed off most life forms and it is still doing what it has always done.
Then we got to gravity where I was told when we consider the effects of gravity, however, we know that the objects will warp the spacetime around them.
When it comes to the GPS system the man who holds 11 patents including the software for the GPS system used Newtonian physics.
Concerning the atomic clock.
quote:
NIST-F1 is referred to as a fountain clock because it uses a fountain-like movement of atoms to measure frequency and time interval. First, a gas of cesium atoms is introduced into the clock's vacuum chamber. Six infrared laser beams then are directed at right angles to each other at the center of the chamber. The lasers gently push the cesium atoms together into a ball. In the process of creating this ball, the lasers slow down the movement of the atoms and cool them to temperatures near absolute zero.
Two vertical lasers are used to gently toss the ball upward (the "fountain" action), and then all of the lasers are turned off. This little push is just enough to loft the ball about a meter high through a microwave-filled cavity. Under the influence of gravity, the ball then falls back down through the microwave cavity.
The round trip up and down through the microwave cavity lasts for about 1 second. During the trip, the atomic states of the atoms might or might not be altered as they interact with the microwave signal. When their trip is finished, another laser is pointed at the atoms. Those atoms whose atomic state were altered by the microwave signal emit light (a state known as fluorescence). The photons, or the tiny packets of light that they emit, are measured by a detector.
This process is repeated many times while the microwave signal in the cavity is tuned to different frequencies. Eventually, a microwave frequency is found that alters the states of most of the cesium atoms and maximizes their fluorescence. This frequency is the natural resonance frequency of the cesium atom (9,192,631,770 Hz), or the frequency used to define the second.
The combination of laser cooling and the fountain design allows NIST-F1 to observe cesium atoms for longer periods, and thus achieve its unprecedented accuracy. Traditional cesium clocks measure room-temperature atoms moving at several hundred meters per second. Since the atoms are moving so fast, the observation time is limited to a few milliseconds. NIST-F1 uses a different approach. Laser cooling drops the temperature of the atoms to a few millionths of a degree above absolute zero, and reduces their thermal velocity to a few centimeters per second. The laser cooled atoms are launched vertically and pass twice through a microwave cavity, once on the way up and once on the way down. The result is an observation time of about one second, which is limited only by the force of gravity pulling the atoms to the ground.
As you might guess, the longer observation times make it easier to tune the microwave frequency. The improved tuning of the microwave frequency leads to a better realization and control of the resonance frequency of cesium. And of course, the improved frequency control leads to what is one of the world's most accurate clocks.
Source
When in a GPS satellite the clock will run faster than one on the Earth's surface so a offset is used to account for the 38,700 ns/per day. Offsets are also used to adjust for the irregular height the satellite travels on its journey as it goes up and down, faster and slower, in it's orbit.
Now to topic.
Existence = state of being.
Non-existence = state of not being.
Either the universe has existed for an infinite eternity in some form.
OR
The universe had a beginning to exist in and from non-existence.
Anyone who believes the universe had a beginning to exist is a creationist, as he/she believes in creation.
All those who believes the universe has always existed in some form is a non-creationist.
Anyone who believes the BBT with it's singularity produced the universe believes in creation from non-existence.
There are those who believe in the String or SuperString hypothesis. They have a universe that is produced by existing material.
There are those who believe in the eternal expanding contraction which produces a new universe.
Sorry BigBangers you are all creationist.
God Bless,
Edited by ICANT, : No reason given.
"John 5:39 (KJS) Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me."
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