Retrothermodynamics (Physics)

The hypothetical physics of heat, energy, and work operating in reverse temporal direction. In retrothermodynamics, heat would flow spontaneously from cold objects to hot ones, friction would accelerate objects instead of slowing them down, and engines would run by absorbing exhaust fumes and fuel while outputting work and air. It's what you'd get if you took a video of normal thermodynamic processes and played it backward—a universe where every energy transaction is perfectly reversed, and the arrow of thermal time points the other way.

Retrothermodynamics (Physics) Example: "The movie scene where a character's breath unfreezes and returns to their mouth is a charming moment of cinematic retrothermodynamics."

by Dumu The Void March 11, 2026

Anti-Thermodynamics (Physics)

The study of hypothetical systems or processes that would appear to violate the established laws of thermodynamics, particularly the Second Law. While real-world anti-entropy creates local order at the expense of greater overall disorder, true anti-thermodynamics would describe a perpetual motion machine of the second kind—a device that could convert heat completely into work without any waste, or spontaneously separate mixed gases without energy input. It's the physics of what can't happen, the science of impossible wishes.

Anti-Thermodynamics (Physics) Example: "Every email promising 'free energy for life' is an exercise in anti-thermodynamics—selling dreams that would require rewriting the fundamental laws of the universe."

by Dumu The Void March 11, 2026

Negative Thermodynamics (Physics)

A hypothetical regime of physics where temperature itself could be negative—but in a very specific quantum sense. In conventional physics, negative absolute temperatures are possible in certain quantum systems where population inversions occur, and they behave bizarrely: heat actually flows from the negative temperature system to a positive one, and they can be "hotter" than infinite temperature. It's a mind-bending corner of statistical mechanics where the normal rules of hot and cold flip, and adding energy can actually decrease disorder.

Negative Thermodynamics (Physics) Example: "The laser works by creating a population inversion—a state of negative thermodynamics where more atoms are excited than relaxed, ready to dump their energy all at once."

by Dumu The Void March 11, 2026

Retromechanics (Physics)

A speculative branch of physics concerned with mechanical systems operating under time-reversed conditions. If you could reverse time, Newton's laws would still hold (they're time-symmetric), but every collision, every trajectory, every mechanical interaction would play out backward. Retromechanics describes this reversed world: balls un-bouncing, pendums unsweeping, planets un-orbiting. It's a useful thought experiment for understanding why the Second Law of Thermodynamics (which isn't time-symmetric) gives time its direction, even though the underlying mechanics don't care which way the clock runs.

Retromechanics (Physics) Example: "The simulation showed planets orbiting backward, demonstrating retromechanics—gravity doesn't care about time's direction, even though everything else does."

by Dumu The Void March 11, 2026

Anti-Mechanics (Physics)

A hypothetical framework for mechanical systems that would actively resist or oppose the normal laws of motion. While normal mechanics describes how forces cause accelerations (F=ma), anti-mechanics would describe a world where applying a force causes deceleration in the direction of the force, or where objects naturally accelerate away from applied forces. It's the physics of a universe with reversed inertia, where pushing something makes it move toward you and pulling makes it move away—a world that would be utterly unrecognizable and probably uninhabitable.

Anti-Mechanics (Physics) Example: "In my dream, I tried to push a box, but it accelerated away from me—my subconscious had invented a whole anti-mechanics universe while I slept."

by Dumu The Void March 11, 2026

Negative Mechanics (Physics)

The study of mechanical systems involving negative mass—a purely hypothetical concept where an object would accelerate in the opposite direction of an applied force. If you pushed a negative mass object, it would come toward you; if you pulled it, it would move away. Negative mechanics describes the bizarre behavior of such matter: it would be repelled by normal gravity, could create perpetual motion machines when paired with normal mass, and would violate every intuitive understanding of how the physical world works. It remains purely theoretical, with no evidence such matter exists.

Negative Mechanics (Physics) Example: "The sci-fi spaceship used negative mechanics—its 'negative mass' engines meant it accelerated toward its target by pushing away from it."

by Dumu The Void March 11, 2026

Anti-Physics

A broad term for any proposed physical framework that would systematically oppose or invert the known laws of physics. Unlike specific branches like anti-gravity (which opposes one force), anti-physics imagines wholesale replacement of physical law: anti-matter behaving opposite to matter in every way (not just charge), anti-entropy being the default, anti-inertia governing motion. It's the physics of mirror universes, of worlds where up is down, attraction is repulsion, and every "law" we depend on is systematically violated.

Example: "The novel's alternate dimension operated on anti-physics—light bent away from massive objects, friction accelerated things, and nothing made sense by our standards."

by Dumu The Void March 11, 2026