## The day Relativity changed

loopdoctorNovember 30November 300Level I Student, Level II Advanced, Level III Doctor

Einstein started publishing on his General Relativity in January-February 1916. On these articles Karl Schwarzschild based his exact solutions. On 11 May that year, however, Einstein published is official GR – with a little but important change: no more two equal reference frames. Too late for Karl. Other...

Contrary to popular believe, there are many Schwarzschild Solutions. Karl himself found one to a mass-point and one to a sphere of in-compressible liquid early 1916. After Karl’s death Einstein made important changes in his official publication: he abandoned his g = -1 requirement in a footnote. Nobody checked...

Einstein used a complicated set of tensors in his General Relativity. However in his writing in 1916 he used a Laplace operator, which can help us to determine the gravitational potential inside a sphere without having to go into his field equations. Many surprising results: The behaviour of clocks is in line with all...

## No ‘Event Horizon’ in New Time-like Solution

loopdoctorFebruary 15March 160Level III Doctor

Einstein’s General Relativity contains the Laplace operator of a sphere of incompressible liquid. It links the time-like solution (how fast does the clock tick) directly with the gravitational potential: no need for using tensor operations. He never applied it to the potential inside a sphere. This article is doing...

## Earth’s core temperature calculated, not guessed

loopdoctorFebruary 11February 170Level I Student

The cause of the high temperature of the inner core of the earth is currently thought to be radioactive decay and residual heat. This article provides a different explanation: Energy conservation. Imagine a tunnel through the earth and calculate the potential energy of a molecule at the surface and in the core. You...