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2.5 Time symmetric and asymmetric laws
A critical observation of the laws that govern the physical world convey both time symmetric and asymmetric laws exist. A time symmetric law refers to the condition that the behavior of the phenomena would be existent in a symmetric
fashion in a time-reversed world. Time asymmetric laws refer to the case where the phenomena would not be existent in a time-reversed world. An illustrative example to understand time symmetry and asymmetry is the breaking of a glass tumbler. A glass tumbler while falling to the ground can be recorded as a movie and this movie according to the laws of nature cannot be run backward. This is due to the fact that broken glass pieces cannot be assembled to an unbroken glass tumbler without doing any external energy, a basic principle inferred from the Second Law of Thermodynamics. Therefore, glass tumbler breaking process refers to a macroscopic process that is time asymmetric. However, the same process involves microscopic phenomena as well. In the microscopic level, glass breaking can be visualized as atoms or molecules bouncing off one another. This microscopic process however according to the laws of science can be regarded to be time symmetric according to the microscopic laws of science. In other words, the microscopic process is time symmetric whereas the macroscopic process is time asymmetric.
Other time symmetric and asymmetric laws are summarized as follows:
• Maxwell's equations with material absorption are time symmetric in microscopic domain but not in macroscopic domain.
• Newton's mechanics in microscopic domain is time symmetric but not in macroscopic domain
• The Laws of gravity are also time symmetric in classical mechanics
• Quantum field theory has time symmetry whereas Higgs boson decay, B meson decay processes have CP violation and are time asymmetric.
Therefore, one can conclude that in restricted contexts, time symmetry exists in the Universe. Overall, the Universe does not agree for time symmetry due to uncertainty principle in quantum scales and entropy in larger scales.It appears from various scientific observations that the time dimension does not have its critical influence in the microscopic world whereas it does influence in the macroscopic world, conveying asymmetry. Therefore, an interface should exist where the critical influence of time dimension towards asymmetric behavior exists. Wang et al.  charged laser to induce dipole moment in micron sized latex beads in water filled cell and measured entropy changes in the process. Their observations conveyed that over periods shorter than one tenth of a second entropy decreased and did not increase. However, over periods of two seconds, entropy increased. Their work conveyed that as thermodynamic systems become smaller, the probability that they can run reverse increases. This inability to understand relations between microscopic world and macroscopic world involving time dimension is a big challenge ahead.
Based on these observations from scientific perspective, it can be generally inferred that science is unable to convey the exactness and purpose of time dimension in microscopic and nanoscopic systems and how the micro-world is related to the macro-world through the medium of time.