gravity and light


by louisrancourt
Tags: gravity, light
louisrancourt
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#1
Jan2-14, 09:33 AM
P: 3
hi
Can you explain why a mobile mass is pushed towards a hidden light and goes back to original position when light is turned off. The mobile mass is at the end of a torsional pendulum suspended by trifilar small copper wire and is completely enclosed in a box. No air movement perceived.
Louis
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ZapperZ
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#2
Jan2-14, 09:38 AM
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Quote Quote by louisrancourt View Post
hi
Can you explain why a mobile mass is pushed towards a hidden light and goes back to original position when light is turned off. The mobile mass is at the end of a torsional pendulum suspended by trifilar small copper wire and is completely enclosed in a box. No air movement perceived.
Louis
This description is vague and confusing. Please provide proper, published citation where this experiment has been published, per the requirement of our PF Rules.

Zz.
louisrancourt
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#3
Jan2-14, 09:45 AM
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hi
The paper :The effect of light on gravitational attraction ' was puiblished in Physics essays, december 2011. More experiment for 3 years led to the same conclusion. It really seems that there was a pushing force on the mass. Maybe its time to revise our notion of gravitational forces and their nature.
Louis

ZapperZ
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#4
Jan2-14, 09:57 AM
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gravity and light


Quote Quote by louisrancourt View Post
hi
The paper :The effect of light on gravitational attraction ' was puiblished in Physics essays, december 2011. More experiment for 3 years led to the same conclusion. It really seems that there was a pushing force on the mass. Maybe its time to revise our notion of gravitational forces and their nature.
Louis
1. This is a dubious journal.

2. You obviously have no clue on how to provide a proper scientific citation. Please use Author, Journal name, volume number, page number, year.

3. Have you tried to do a citation index on the paper and see how many references were made to it and whether this has been verified and explained?

Zz.
Malverin
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#5
Jan2-14, 10:19 AM
P: 117
Maybe he speaks about something like this

http://en.wikipedia.org/wiki/Optical_tweezers

But that is interesting too

http://www.technologyreview.com/news...-repels-light/

ZapperZ
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#6
Jan2-14, 11:35 AM
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Sorry, but what you cite sounds nothing like what the OP described. Those experiments do not require us to "... revise our notion of gravitational forces... " Please wait for the OP to clarify.

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louisrancourt
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#7
Jan2-14, 04:50 PM
P: 3
hi
I realized there was not enough details to explain what happened in the experiment.
A 50 cm torsion pendulum supported in its middle point by 3 fine copper wire is placed in a cubicle. 100 g mass are placed at each end of the pendulum. A 500 g mass is brought close to one end of the pendulum and a point is reached where the gravitational attraction of the 500 g mass is balanced by the restoring force of the torsion wires. When that equilibrium point is reached, a 30 degrees laminar red laser beam is passed between the 2 masses, without touching them. The mobile mass slowly gets closer to the 500 g mass. When the light is cut off, the mobile mass returns to its equilibrium point. There was no measurable increase of temperature, no air movement and no static electric field detected.
The effect begins right away and stops when the light is cut off. When the laser beam was directed on the opposite side of the 100 g mass, it moved again towards the light beam.
What physical process can explain these facts?
Any help will be appreciated.
Louis
Drakkith
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#8
Jan2-14, 05:02 PM
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What's the problem? Light has energy and thus affects spacetime the same way mass does, generating gravity.
Vanadium 50
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#9
Jan2-14, 05:30 PM
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If you have 100g and 500 g masses and are watching them move, whatever you are looking at, it's not gravity.
bahamagreen
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#10
Jan2-14, 07:04 PM
P: 503
Until this experiment is performed in vacuum in free fall, how does one not eliminate any possible Bernoulli / Venturi effects - that the laser might be causing the air to flow... or that heating of the air is causing an "up draft" of the air in the gravitational field?

Or that the masses are responding to the change in position of the experimenter as he moves around the apparatus to switch the laser on and off...?
Vanadium 50
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#11
Jan2-14, 08:22 PM
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Again, it doesn't matter if it's air drafts or not. The central premise - that this is a measurement of gravity - is simply wrong.
ZapperZ
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#12
Jan2-14, 09:25 PM
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Quote Quote by louisrancourt View Post
hi
I realized there was not enough details to explain what happened in the experiment.
A 50 cm torsion pendulum supported in its middle point by 3 fine copper wire is placed in a cubicle. 100 g mass are placed at each end of the pendulum. A 500 g mass is brought close to one end of the pendulum and a point is reached where the gravitational attraction of the 500 g mass is balanced by the restoring force of the torsion wires. When that equilibrium point is reached, a 30 degrees laminar red laser beam is passed between the 2 masses, without touching them. The mobile mass slowly gets closer to the 500 g mass. When the light is cut off, the mobile mass returns to its equilibrium point. There was no measurable increase of temperature, no air movement and no static electric field detected.
The effect begins right away and stops when the light is cut off. When the laser beam was directed on the opposite side of the 100 g mass, it moved again towards the light beam.
What physical process can explain these facts?
Any help will be appreciated.
Louis
You still have not provided the proper citation, and thus, all we have to go by is your interpretation of the experiment. Sorry, but that isn't enough.

I'm an experimentalist. The DETAILS of the experiment, of ANY experiment, are vital, based on my experience of not only performing such experiments, but also in refereeing any manuscript submitted for publication. Your description alone is not sufficient.

So unless you are able to provide the proper citation, then this topic does not meet the criteria for the source of discussion that we have outlined in the PF Rules that you had agreed to. It will result in this thread being closed.

Zz.


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