Subrahmanyan Chandrasekhar and the Limits of Physics: The Triumph

• Indian physicist Subrahmanyan Chandrasekhar identified the number '1.4', a critical figure in understanding stellar evolution and white dwarf stability.
• Known as the 'Chandrasekhar limit', this value represents approximately 1.4 times the mass of the Sun, beyond which a white dwarf cannot support itself against gravitational collapse.

Early Life and Academic Foundations

• Born in Lahore in 1910, Chandrasekhar was the nephew of Nobel laureate C.V. Raman.
• During his undergraduate years, he encountered cutting-edge physics through Arnold Sommerfeld, mastering Fermi-Dirac statistics which proved essential for his future discoveries.

Degeneracy Pressure in White Dwarfs

• White dwarfs are stellar remnants containing roughly the Sun's mass squeezed into Earth's volume, supported against gravity by 'degeneracy pressure' rather than thermal heat.
• This pressure arises from the Pauli exclusion principle, which prevents electrons from occupying the same quantum state, forcing them into higher energy levels and creating an outward push.

Relativistic Calculations and the Limit

• While traveling to England, Chandrasekhar performed complex calculations combining quantum mechanics with special relativity.
• He realized that as electrons approach the speed of light, their ability to exert pressure hits a limit; gravity, however, does not.
• If a white dwarf exceeds ~1.4 solar masses, degeneracy pressure fails, and the star collapses, a breakthrough discovery that initially faced significant resistance from the scientific establishment.