New Frontiers in Understanding Time
A study published in the journal Physical Review Research has opened up new frontiers in the understanding of time. Professor Giovanni Barontini from the University of Birmingham has demonstrated that the passage of time can be tracked without the use of clocks. The experiment, conducted with a cloud of 24,000 rubidium atoms cooled to a few billionths of a degree above absolute zero, showed that time can emerge as a consequence of internal processes within a quantum system, rather than existing as an independent external quantity.
Experimental Methodology
During the experiment, the rubidium atoms were held using laser traps. Two beams of different frequencies split the cloud into visible (bright) and hidden (dark) zones. The bright region periodically contracted and expanded, showing the changes occurring within the system. Crucially, the study did not use an external timer; the driving force behind the process was entropy — a measure of the system's disorder.
The quantum trap used in the experiment was completely isolated from the outside world. Increases or decreases in entropy moved the system forward along a timeline. When the distribution of atoms became static, local time stopped. Professor Barontini called this phenomenon 'entropic time,' noting that
“our study provides the first controlled experimental evidence that time can be defined through changes inside the system itself, rather than as an external ticking clock.”
In his comments, the professor emphasized that in some theories, especially quantum gravity, time is not a fundamental parameter.
“Yet in everyday life, we clearly see how time flows from the past into the future,”he added. This research offers a fresh perspective on the nature of time in quantum gravity, as entropic time flows in only one direction, forming a clear arrow of time.
Entropic time also orders events even in a system that constantly pulses, expanding and contracting. It can speed up or slow down depending on how entropy is redistributed within the system. This could lead to new insights in physics and change our understanding of time itself.
“Why does this happen, if most fundamental laws of physics work equally well forward and backward in time?”asks Professor Barontini, underscoring the significance of this discovery for future research.
This study has the potential to transform our understanding of time, as it proposes a new concept in which time is not a fixed quantity but rather a result of the dynamics of quantum systems. The study of entropic time could have a major impact on the development of quantum physics and gravitational theories, opening up new directions for research in this complex and important field of science.
This groundbreaking research aligns with recent findings in quantum mechanics, where phenomena such as photons displaying negative time challenge traditional concepts of temporal flow. Understanding these complexities deepens our grasp of time's nature and its implications in various scientific theories.