According to our current understanding of physics, there are no known objects or entities that can travel faster than the speed of light in a vacuum. The speed of light, denoted as 'c', is considered an absolute speed limit in the universe as established by Einstein's theory of relativity.
In the framework of special relativity, which describes the behavior of objects moving at constant speeds, it is postulated that no object with mass can reach or exceed the speed of light. As an object with mass accelerates towards the speed of light, its relativistic mass increases, requiring an infinite amount of energy to reach or exceed 'c'. This is known as the mass-energy equivalence principle, expressed by the famous equation E=mc².
However, it is important to note that the speed of light limit applies to objects with mass. Theoretical particles known as tachyons are sometimes mentioned in science fiction or speculative physics as objects that travel faster than light. Tachyons, if they exist, would be particles that always move faster than 'c' and have imaginary mass. However, tachyons have not been observed in experiments, and their existence remains purely speculative at this time.
It is also worth noting that there are phenomena in physics, such as the expansion of the universe during cosmic inflation, where certain regions of space can move apart from each other faster than the speed of light. However, this does not involve objects traveling through space but rather the expansion of the fabric of spacetime itself.
In summary, within our current scientific understanding, there are no known objects or entities that can travel faster than the speed of light. The speed of light remains a fundamental constant in the universe, and it plays a crucial role in the behavior of particles and the transmission of information.