DimaMazin Posted April 22, 2016 Share Posted April 22, 2016 If we use generator of gravitational waves instead of electric generator can we get electricity or another stream of energy in wires? Link to comment Share on other sites More sharing options...
ajb Posted April 22, 2016 Share Posted April 22, 2016 I am not sure how, but gravitational waves carry energy and so in principle one could extract useful energy from them. But as gravity is a very weak force I would not expect any gravitational wave power stations. Link to comment Share on other sites More sharing options...
geordief Posted April 22, 2016 Share Posted April 22, 2016 In fantasy land* could changes in a gravitational field conceivably be used in connection with quantum effects? *being charitable in my direction Link to comment Share on other sites More sharing options...
kisai Posted April 22, 2016 Share Posted April 22, 2016 Those would have to be some pretty gosh-darn long and strong wires. Link to comment Share on other sites More sharing options...
Delta1212 Posted April 22, 2016 Share Posted April 22, 2016 In fantasy land* could changes in a gravitational field conceivably be used in connection with quantum effects? *being charitable in my direction Used to do what? Link to comment Share on other sites More sharing options...
geordief Posted April 22, 2016 Share Posted April 22, 2016 Used to do what? Christ I don't know. It was just a vague idea. If no one else can see any potential then I guess there is none. I was actually "thinking" along the lines of what is referred to as quantum computing but without any expertise my contribution has no value. Link to comment Share on other sites More sharing options...
DimaMazin Posted April 22, 2016 Author Share Posted April 22, 2016 I am not sure how, but gravitational waves carry energy and so in principle one could extract useful energy from them. But as gravity is a very weak force I would not expect any gravitational wave power stations. If the station is able to slowly move electrons in wires then can electricity be there? (We don't need useful effect, we need scientific effect.) Link to comment Share on other sites More sharing options...
ajb Posted April 23, 2016 Share Posted April 23, 2016 If the station is able to slowly move electrons in wires then can electricity be there? Yes... but as gravity is so weak I cannot imagine getting reasonable amounts of useful energy. Unless you really are in sci-fi land and put your power station close to a strong source, like a black hole binary system. Link to comment Share on other sites More sharing options...
DimaMazin Posted April 28, 2016 Author Share Posted April 28, 2016 Yes... but as gravity is so weak I cannot imagine getting reasonable amounts of useful energy. Unless you really are in sci-fi land and put your power station close to a strong source, like a black hole binary system. Wires with electricity can attract and push away each other. Gravity can only attract. Can wires with gravitational electricity push away each other? Link to comment Share on other sites More sharing options...
BiotechFusion Posted April 28, 2016 Share Posted April 28, 2016 Gravitational waves can transfer energy to particles but the scale they would have to be for that to have any practical application is on the scale of multiple solar masses. Right now all the planets and the Sun are creating gravitational waves with their orbits and rotations and wobbles, but even at that scale, gravity is heavily weakened by distance. Link to comment Share on other sites More sharing options...
ajb Posted April 28, 2016 Share Posted April 28, 2016 Wires with electricity can attract and push away each other. Gravity can only attract. Can wires with gravitational electricity push away each other? What is gravitational eletricity? Link to comment Share on other sites More sharing options...
BiotechFusion Posted April 28, 2016 Share Posted April 28, 2016 What is gravitational eletricity? I think they mean that just as with a magnetic field, a gravitational wave could be strong enough to separate an electron from an atom, thus creating a free charge that can potentially move to another atom. Not very likely, but I guess I can't rule out the possibility at some insanely high energy interaction. Link to comment Share on other sites More sharing options...
ajb Posted April 29, 2016 Share Posted April 29, 2016 Not very likely, but I guess I can't rule out the possibility at some insanely high energy interaction. Such an interaction is going to be highly suppressed due to the weak nature of gravity as compared with electromagnetism. I guess one could do some calculation using gravition-electron scattering to tree level (as an effective theory) and see what one gets. Tiny amplitudes I am sure. Link to comment Share on other sites More sharing options...
swansont Posted April 29, 2016 Share Posted April 29, 2016 Why would gravitational waves cause a current flow — why would the electrons and the wire they are in move relative to each other? Or why would this cause an ionization? Link to comment Share on other sites More sharing options...
ajb Posted April 29, 2016 Share Posted April 29, 2016 Or why would this cause an ionization? I can imagine that a graviton could course ionisation of an atom... but this would be very rare. Link to comment Share on other sites More sharing options...
swansont Posted April 29, 2016 Share Posted April 29, 2016 I can imagine that a graviton could course ionisation of an atom... but this would be very rare. Not sure I want to be around for an event where this could happen. Link to comment Share on other sites More sharing options...
ajb Posted April 29, 2016 Share Posted April 29, 2016 (edited) Not sure I want to be around for an event where this could happen. I am not sure what estimates we have here, for sure this is a rare event. Maybe this is not what DimaMazin means by 'gravitaional eletricity'. EDIT: The graviton isonisation cross-section for hydrogen-like atoms is of the order Planck length squared [1]. (This was calculated earlier by Dyson and others) References [1] Stephen Boughn and Tony Rothman, Aspects of graviton detection: graviton emission and absorption by atomic hydrogen Classical and Quantum Gravity, Volume 23, Number 20, 2006 Edited April 29, 2016 by ajb Link to comment Share on other sites More sharing options...
DimaMazin Posted April 30, 2016 Author Share Posted April 30, 2016 Such an interaction is going to be highly suppressed due to the weak nature of gravity as compared with electromagnetism. I guess one could do some calculation using gravition-electron scattering to tree level (as an effective theory) and see what one gets. Tiny amplitudes I am sure. We can add usual electricity to gravitational electricity for research of gravitational electricity. Link to comment Share on other sites More sharing options...
Strange Posted April 30, 2016 Share Posted April 30, 2016 We can add usual electricity to gravitational electricity for research of gravitational electricity. What is "gravitational electricity"? Do you mean things like hydroelectricity? Link to comment Share on other sites More sharing options...
DimaMazin Posted April 30, 2016 Author Share Posted April 30, 2016 What is "gravitational electricity"? Do you mean things like hydroelectricity? Electric potential is like gravitational potential. Water has gravitational potential but it is mechanically connected with electricity therefore "hydroelectricity" isn't scientific name. Link to comment Share on other sites More sharing options...
Strange Posted April 30, 2016 Share Posted April 30, 2016 Electric potential is like gravitational potential. Water has gravitational potential but it is mechanically connected with electricity therefore "hydroelectricity" isn't scientific name. Hydroelectricity is a well-understood term. https://en.wikipedia.org/wiki/Hydroelectricity But if that isn't what you mean then: What is "gravitational electricity"? Link to comment Share on other sites More sharing options...
DimaMazin Posted May 1, 2016 Author Share Posted May 1, 2016 Hydroelectricity is a well-understood term. https://en.wikipedia.org/wiki/Hydroelectricity But if that isn't what you mean then: What is "gravitational electricity"? Let's consider similarities :https://en.wikipedia.org/wiki/Electricity Electric charge - mass Electric field - gravitational field(space-time) Electric potential - gravitational potential Electric current - moving of gravitational particles Electromagnets - changing gravitational fields generate gravitational currents Link to comment Share on other sites More sharing options...
ajb Posted May 1, 2016 Share Posted May 1, 2016 You mean something like a flow of masses? We see this with, for example, accretion disks. You have to be careful making a direct comparison between EM and gravity, but some things do make sense. I am not sure if 'electricity' is really on of those. However, we do have the fact that accelerating masses are sources of gravitational radiation. 1 Link to comment Share on other sites More sharing options...
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