According to our current understanding of physics, the speed of light in a vacuum, denoted by the symbol "c," is a fundamental constant of nature and represents the maximum speed at which information or particles can travel. However, the concept of a photon's "creation" or "existence" can be somewhat nuanced.
In the framework of special relativity, which describes the behavior of objects moving at high speeds, photons are considered massless particles that always travel at the speed of light. From this perspective, a photon is said to be "born" at the speed of light, and it never accelerates or decelerates.
However, it's important to note that the behavior of a photon can also be interpreted in terms of quantum field theory. In this framework, photons are regarded as excitations of the electromagnetic field. When an electromagnetic interaction occurs, the field can undergo a transition, and a photon is detected. The process of this transition, such as an electron moving to a lower energy state and emitting a photon, can be seen as the "creation" of a photon.
It's worth mentioning that the quantum field theory perspective does not imply that the photon accelerates to the speed of light after creation. Rather, once the photon is created, it is immediately traveling at the speed of light.
In summary, while the concept of a photon's "creation" can be understood differently depending on the framework used, once a photon is "born," it is considered to be traveling at the speed of light without the need for acceleration.