According to our current understanding of physics, it is not possible to create mass from nothing. The law of conservation of mass-energy, a fundamental principle in physics, states that the total mass-energy in a closed system remains constant over time. This principle is a consequence of the conservation of energy, which is a more general concept.
In particle physics, mass is associated with particles and is a form of energy. The famous equation E=mc², proposed by Albert Einstein, expresses the equivalence of energy (E) and mass (m). It states that mass can be converted into energy and vice versa, but the total amount of mass-energy in a system remains constant.
In various physical processes, such as nuclear reactions or particle interactions, energy can be transformed into different forms, including the creation or annihilation of particles. However, the total mass-energy before and after such processes remains the same. The conservation laws governing these processes are well-established and have been extensively tested and confirmed by experimental observations.
Therefore, while energy and mass can be converted into one another, it is not currently possible, according to our scientific understanding, to create mass from nothing without violating the conservation principles.