Non-fueled, bladeless, minimally-noisy aviation engine --- Science fiction or real theoretical science? As a non Aeronautics expert I ask if non-fueled (electric?) vehicles which are minimally-noisy only science fiction or a real theoretical scientific concept aimed for close or very far future development?

I ask if there is any theoretical science that tries to describe how such a thing would be possible in the future...

Characteristics of such a vehicle:


Some non-fueled thrusting; if electrical, than an enough powerful battery or enough powerful solar energy exploitation mechanism
Fireless
Bladlessness: No jet, no propellers/rotors or turbines
Wingless
Silent or almost silent: Not the regular noise. Something very very quiet - at least 75% of the noise will be air molecules rotating solely from the whole objects' motion, but not from the engine itself.


This flying object may or may not be able to fly both in earth's atmosphere and out of it.
Bob Lazar's flying saucers maybe?
Electric propulsion using ion thrusters is already in use for space applications. Today's ion thrusters deliver very high specific impulse at low power (typically in the order of 10 to 1000 W). Lower or higher outputs are possible and subject of current research and development. 
Ion thrusters work great in the vacuum/free fall environment where low thrust over long durations is useful, and electric energy can be generated on the spot with solar panels.

The usage of ion thrusters in the atmosphere is possible, but there are major challenges:


planes require a lot of thrust during take-off
the propellant does not contain the energy to drive the thruster
the atmospheric pressure changes all the working paramters. Existing ion thrusters for space are not useful in the atmosphere.


Today, ion thrusters are not ready for aviation and it might never happen, but there is some research going in this direction. Personally I do not believe that ion thrusters are useful for low altitude, but I can well imagine a scramjet engine for high altitude using ion thrust technology. In any case, even an ion thruster without any moving parts cannot be silent when working in the atmosphere. The particles expelled at very high speed will create a lot of noise, similar to a welding torch.