Updated

Updated · Universe Today · Jul 14

Constant Acceleration Creates a Rindler Horizon, Blocking Signals Beyond 0.999999c

Updated

Updated · Universe Today · Jul 14

Constant Acceleration Creates a Rindler Horizon, Blocking Signals Beyond 0.999999c

Q: Can the phantom heat an accelerating observer sees in empty space be harnessed as a real energy source?

No. The “phantom heat” seen by an accelerating observer — the Unruh effect — is not regarded as a practical or free energy source. Physically, the effect means an accelerating detector in empty space responds as if it were immersed in a thermal bath. But mainstream theory says that apparent heat is tied to the energy required to keep the detector accelerating. In other words, any excitation you get out is paid for by the work put into the acceleration, not extracted from a hidden reservoir in the vacuum. That is why physicists remain skeptical of claims that vacuum-related effects can deliver net usable power. William Unruh, after whom the effect is named, has argued that you cannot directly mine the vacuum for free energy. More formal studies of accelerated detectors likewise find no net extractable stress-energy in the detector itself; the observed response comes from the observer’s motion and boundary conditions, not from a standalone energy source sitting in empty space. There is active theoretical work on “quantum work extraction” and on related vacuum phenomena such as the Casimir effect, and some companies have made commercial claims. But there is still no independently verified experimental evidence that Unruh-type heat can be harnessed to produce net power. So the best current answer is that the heat is physically meaningful for the accelerating observer, and important for fundamental physics, but not a realistic energy source.

1 articles · Updated · Universe Today · Jul 14

Constant acceleration can create a horizon of its own: beyond a certain region, light signals never reach the accelerating observer, even though neither the ship nor the signal exceeds lightspeed.
At fixed speed, a distant light pulse eventually catches up; under endless acceleration, the ship keeps edging closer to c—0.9c, 0.99c, 0.999999c—so the pulse closes the gap forever without arriving.
Only signals emitted close enough when the acceleration begins can still get through; if the observer slows or stops, the blocked light reaches them.
Wolfgang Rindler helped define this boundary as the Rindler horizon, extending the idea of horizons beyond black holes to limits set purely by motion through spacetime.
The article frames the effect as the next step in a near-lightspeed travel series: motion compresses what you can see, while acceleration can permanently wall off part of the universe.

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Universe Today3d ago

Wolfgang Rindler's Rindler Horizon: Constant Acceleration Limits Universe View

If we can't reach near-light speeds, can we ever truly test these cosmic blind spots on Earth?

If acceleration can wall off parts of the universe, could future spacecraft create their own private realities?

Can the phantom heat an accelerating observer sees in empty space be harnessed as a real energy source?

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1 total

Universe Today3d ago

Wolfgang Rindler's Rindler Horizon: Constant Acceleration Limits Universe View

Constant Acceleration Creates a Rindler Horizon, Blocking Signals Beyond 0.999999c

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