The universe, it seems, is a finely tuned orchestra where the constants of nature play a crucial role in the symphony of life. A recent study has shed light on an unexpected requirement for life as we know it, one that lies not in the nuclear reactions of stars but in the humble act of liquid flow. This revelation not only deepens our understanding of the universe's fine-tuning but also opens up new avenues for exploration in biology and the search for extraterrestrial life.
The Liquid Flow Conundrum
Kostya Trachenko, a professor of physics at Queen Mary University of London, has been exploring the question of what limits a liquid's flow. This inquiry is particularly relevant to biology, as cells rely on motion at very small scales for processes like protein folding, nutrient diffusion, and waste removal. Trachenko's earlier work revealed an intriguing finding: viscosity in any liquid has a hard floor, a minimum value it cannot drop below, regardless of temperature or pressure. This floor is determined by the deepest constants in physics, such as the Planck constant, electron mass, and electron charge.
A Bio-Friendly Window
Trachenko's newer paper takes this concept a step further, connecting it directly to biology. Human blood, for instance, operates within a narrow viscosity range. Alter this range by even a few percent, and the cardiovascular system fails. The study shows that a change in the Planck constant or electron charge would push blood viscosity outside this healthy range, rendering it unsuitable for life as we know it. This bio-friendly window, as Trachenko calls it, is a narrow range where liquids remain runny enough for cellular chemistry to function.
Redundancy and Fine-Tuning
The paper also raises questions about the redundancy of fine-tuning. If the constants were tuned just once, producing atoms and stars, why is there a second layer of bio-friendly flow? Trachenko proposes that the constants were tuned multiple times, each round producing a new sustainable structure. This idea parallels biological evolution, where unrelated lineages can independently develop similar traits. The study suggests that the constants were fine-tuned not just for stars and heavy atoms but also for the subtle thickness of liquids, which is crucial for life.
Implications and Future Directions
This study has far-reaching implications. It provides a calculable requirement for the existence of life: liquid viscosity must fall within a tight window set by the Planck constant, electron charge, and proton and electron masses. This finding puts a new check on future theories attempting to explain the values of fundamental constants. Biology, too, gains a new perspective, as researchers can now explore how changes in viscosity affect various life processes, including pharmacology, blood disorders, and the search for life on worlds with different chemistry.
A Kitchen Counter Insight
The deepest laws of physics, it turns out, can be observed in the simple act of pouring water from a glass. This study not only deepens our understanding of the universe's fine-tuning but also highlights the interconnectedness of physics and biology. It invites us to think about the universe as a finely tuned orchestra where every note, from the grandest to the subtlest, plays a crucial role in the symphony of life.
