Chandrasekhar and the Physics of Black Holes: A History of Vindication

• The Chandrasekhar limit (1.4 solar masses) defines the threshold beyond which a star can no longer sustain itself against gravity, leading to catastrophic collapse and potential black hole formation.
• Subrahmanyam Chandrasekhar faced severe public humiliation from Arthur Eddington in the 1930s for his theoretical work on these limits.
• The scientific consensus eventually shifted as evidence confirmed the existence of black holes and the validity of Chandrasekhar’s calculations.

Scientific Impact

• The 1.4 solar mass limit is critical in modern astronomy as it defines the mechanism for Type Ia supernovae, which serve as "standard candles" for measuring cosmic distances.
• Measurements of Type Ia supernovae were pivotal in the 2011 Nobel Prize-winning discovery that the expansion of the universe is accelerating.
• Cygnus X-1, identified in 1971, became the first widely accepted observation of a stellar-mass black hole, confirming the outcomes Chandra had predicted.

Vindication and Legacy

• In 1983, at age 72, Chandrasekhar was awarded the Nobel Prize in Physics for his foundational work on white dwarfs.
• He authored the definitive text, The Mathematical Theory of Black Holes, essentially mastering a field he was once ridiculed for exploring.
• Chandrasekhar expressed slight irritation that the Nobel committee cited his youthful work on white dwarfs rather than the decade of dedicated research on black holes, yet he accepted the honor with grace.
• Arthur Eddington, who once publicly ridiculed the theory, never received a Nobel Prize.