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## Full-Text Articles in Physics

Gravitational & Electromagnetic Waves On The Null Cone, Maria Babiuc-Hamilton

#### Gravitational & Electromagnetic Waves On The Null Cone, Maria Babiuc-Hamilton

*Maria C. Babiuc-Hamilton*

Bondi (1962) proved mathematically the existence of gravitational waves at null infinity. He found an exact solution of Einstein equations. Within this metric, he calculated the loss of mass due to the emission of gravitational waves. The mas of a system is constant if and only if there is no news. If there is news, the mass decreases as long as there are news.

Gravity & Electromagnetism On The Null Cone, Maria Babiuc-Hamilton

#### Gravity & Electromagnetism On The Null Cone, Maria Babiuc-Hamilton

*Maria C. Babiuc-Hamilton*

Gravitational and electromagnetic radiation travel along light rays, which are principal null directions in space-time. They are characteristic surfaces of Einstein and Maxwell equations. In characteristic coordinates, the field is described by ordinary differential equations.