Mechanism of Black Holes, Essence of Hawking Radiation and Origin Interpretation of Non-Infinite Accretion of Black Holes Under the First Principle of Light String Theory

Based on the First Principle of Light String Theory, this paper reveals the formation mechanism, internal structure and evolutionary law of black holes, and subverts the traditional cognition of spacetime singularity and infinite accretion. It clarifies that a black hole is an ultra‑high‑density cluster of closed light string bound states, and the event horizon is the critical escape interface of light strings. Due to the physical limit of light strings, black holes have a definite density threshold and self‑steady‑state regulation mechanism. Hawking radiation is essentially the energy release of broken light string bound states when the threshold is reached, which serves as the core pathway for black holes to maintain dynamic balance and prevent infinite accretion. Without additional hypotheses, this work establishes a logically closed black hole physics system and realizes the essential unification of black hole theory and fundamental light string theory.