Which physical constants are linked to the anthropic principle?

The anthropic principle in cosmology highlights that the existence of life is contingent upon the specific values of the fundamental constants of nature. Many features necessary for the evolution and persistence of life appear to result from unusual coincidences between these values; if they were altered even slightly, complexity and life might be impossible.1

Specific physical constants and quantities linked to this principle include:

• Strength of gravity: The balance between gravitational forces and other interactions is critical for the formation of stars and galaxies.1
• Mass of the electron: This fundamental quantity influences atomic and molecular structures essential for biochemistry.1
• Lifetime of the neutron: This affects the stability of matter and the processes of nucleosynthesis.1
• Nuclear energy levels: The relative positions of energy levels in carbon and oxygen nuclei—determined by combinations of fundamental constants—are vital. For instance, the resonance of the carbon nucleus allows for the production of elements necessary for life, while the lack of resonance in the subsequent oxygen reaction prevents the total depletion of carbon.1

These coincidences suggest that the universe's structure is uniquely suited to support life, a concept that remains a subject of significant scientific and philosophical debate.1