In the context of special relativity, time dilation occurs due to relative motion between observers in different inertial reference frames. When an object is moving at relativistic speeds and undergoes deceleration, it can experience time dilation from the perspective of a stationary observer.
According to special relativity, time dilation arises because the passage of time is not absolute but depends on the relative motion between observers. When an object moves at speeds approaching the speed of light, its internal clocks appear to slow down from the perspective of a stationary observer. This means that time passes more slowly for the moving object compared to the observer at rest.
When the object decelerates, it experiences a change in velocity, and observers in different reference frames may perceive different rates of time passage. If the deceleration is gradual, the time dilation effects will gradually decrease as the object's speed reduces. However, during the deceleration process, the object may still experience time dilation compared to a stationary observer.
It's important to note that time dilation is a relativistic effect and depends on the relative motion between observers. From the perspective of the object undergoing deceleration, its own clocks would continue to tick at a normal rate, and it would not experience any subjective time dilation. Time dilation is a consequence of relative motion between different inertial frames and does not cause any physical changes or alter the flow of time for an observer within their own reference frame.