The principle you're referring to is known as the conservation of energy, which states that energy cannot be created or destroyed; it can only change forms or be transferred from one system to another. This principle is a fundamental concept in physics and is supported by extensive experimental evidence.
When we talk about the creation of energy in the context of the universe or existence as a whole, it's important to note that the conservation of energy applies to isolated systems. The total energy within a closed system remains constant over time. However, the origin of the energy in the universe is a topic of ongoing scientific investigation and theories.
The prevailing scientific understanding is that the total energy in the universe, including matter and radiation, is considered to be zero on a cosmic scale. This concept arises from the theory of general relativity, which describes gravity and the geometry of spacetime. According to this theory, the total energy of the universe is balanced by the gravitational potential energy associated with matter and the negative gravitational potential energy associated with the curvature of spacetime itself.
It's important to distinguish between the concept of energy and the processes of creation or existence. The conservation of energy pertains to the transformation and exchange of energy within a closed system, but it doesn't address the origin of the universe or the existence of matter and energy. Theories such as the Big Bang theory attempt to explain the early stages of the universe, but the ultimate origin and cause of the universe are still open questions in cosmology and physics.
In summary, while energy cannot be created or destroyed within an isolated system, the origin and existence of the universe, including its energy, are topics that are actively researched and explored in the scientific community.