József Cserti: What would life be like on a flat Earth? (Atomcsill, 2023.04.27.)
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Speaker: József Cserti (ELTE Faculty of Science, Department of Physics of Complex Systems) Title: What would life be like on a Flat Earth? Date: 2023.04.27. Abstract: Even today, there are those who believe that the Earth is actually flat, a disk or a square-shaped plate. Of course, such ideas should not be taken seriously for a moment, but as a thought experiment, it is still worth considering what the world would be like if the Earth were truly a flat plate. What would the gravitational force, the movement on the surface, the distribution of the oceans and the atmosphere be like? Fortunately, we have a suitable tool with which we can answer these questions: real physics, supported by experiments, based on facts and forming a unified theoretical structure. We do not even need to resort to the abstract concepts of modern physics, the classical theory of gravity from Newton is sufficient for all this. It is a mathematical curiosity that the gravitational field of a rectangular body can be determined without computer numerical calculations, using an exact (albeit complicated) formula. Loránd Eötvös (whom we commemorated with Atomcsill lectures on the 100th anniversary of his death in 2019 as part of the Loránd Eötvös Memorial Year) also used this formula in his measurements when he examined the gravitational effect of two lead bricks on the motion of a torsion pendulum placed between them. Why couldn't we use the same formula to describe the hypothetical square-cubic Flat Earth and the movements, geophysical and meteorological phenomena taking place on it? Our lecture presents these results. Based on our calculations, we draw attention to some strange phenomena that differ from our usual life on earth. For example, we will show that, despite the flat ground, moving away from the center on the surface of Flat Earth is like climbing a hill. The rivers flow towards the center of the square, and the surface of the oceans bulges out in a lens-like shape. The planet's atmosphere is also concentrated in the center of the Flat Earth plane, and the corners of the square protrude into space like mountain peaks thousands of kilometers high. The habitable zone only extends to a small ring of the planet's surface. It would be a strange world indeed, and would not resemble the conditions on the real Earth in the slightest. We hope that with this presentation we will be able to show that physics (even classical physics!) is also capable of describing situations that are so far removed from reality. On the other hand, we would also like to emphasize how alive Loránd Eötvös's work is even today. Finally, we leave it to the students to decide where it is better to live: on Flat Earth or on our familiar Earth. More information: http://atomcsill.elte.hu/NEW/events/m...
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