What is the sign of $\hbar$ ?

TL;DR

This paper argues that the sign of Planck's constant 5 in quantum mechanics is arbitrary and can be changed without affecting physical predictions, challenging conventional assumptions.

Contribution

It provides an elementary argument demonstrating the sign of 5 is physically irrelevant and can be altered without consequences.

Findings

The sign of 5 can be changed without physical effects

Quantum mechanical formulations are invariant under sign change of 5

The conventional positive sign of 5 is not physically mandated

Abstract

We present an elementary argument showing that the sign of $\hbar$ in the basic formulation of Quantum Mechanics can be changed without incurring in any physical consequences.