# What is Tipler Cylinder

In 1974 the American mathematical physicist and cosmologist Frank Tiplers discovered, while analysing their solution, an enormous cylinder of infinite length that rotates along its long axis at high speed and could allow time travel. References to cylinders of infinite length can be found in the literature as early as 1936, but it was not until 1974 that Frank Tipler realized that they could permit closed contemporaneous curves that would allow time travel.

The astronomer **Frank Tipler** proposed a mechanism known as a **tipler cylinder**, which absorbs matter with ten times the mass of the sun and rolls it into a very long and dense cylinder. Professor Frank Tipler suggested in 1974 that a tight spinning cylinder 100 km long and 10 km wide could be used.

Selon the Anderson Institute, after rotating the dense cylinder by a few billion revolutions per minute, the spacecraft would follow a precise spiral around the cylinder until it was in a closed, time-like curve. As the cylinder rotated around the spacecraft, it followed the spiral and travelled back and forth billions of years, passing several galaxies.

The usefulness of building a** tipler cylinder **was discredited when Stephen Hawking gave mathematical proof that it is impossible to build a time machine in a finite region containing exotic matter and negative energy according to the general theory of relativity. A simple rotating cylinder of super dense material would be closer to real physics than a real time machine. Furthermore, Hawking proved that time travel does not work in finite cylinders and that one would have to have negative energy, which is extremely unlikely.

The **tipler cylinder**, also known as the **tipler time machine**, is a hypothetical object that is theorized as a potential mode of time travel, which corresponds to the current understanding of physics and the general theory of relativity of mankind although later results have shown that it would allow time travel, although its length appears infinite. This is a piece of material about ten times the mass of the Sun. It is pressed into an almost dense cylinder and rotates for a few billion movements per minute. The Tipler Cylinder Approach is called the “ **Tipler Time Machine**,” because the hypothetical object is theoretically considered as a potential mode of time travel — an approach that would work with our current understanding of physics, especially the general relativity, although later results showed that the device could allow time travel even though its length is unlimited (see discussion of Hawking theorem below).

To use a time machine called Tipler, leave Earth in a spaceship and travel to a cylinder that rotates in space. As you approach the cylinder, you circle it a few times, then fly back to Earth and land in the past.

In 1974 Tipler showed in his essay “The rotating cylinder and the possibility of global causality erosion” that space-time contains a massive, long cylinder that rotates around its longitudinal axis and creates a frame-pulling effect. Tipler argued that such a cylinder would produce a closed, time-like curve, with a speed fast enough to reach at least a few billion revolutions per minute. Before you could assemble a **tipler cylinder**, you would have to rotate it at high speed, perhaps a few billion times per minute.

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All you have to do is make a black hole in the shape of a cylinder that rotates billions of times per second. One must rotate the cylinder, and when it spins, it will begin to disturb the fabric of space-time, so that one will be able to detect the gravitational waves emanating from it.

For the cylinder to work, you need matter that is about ten times the mass of the suns — and a lot of it. You have to roll it around in a long, tight cylinder.

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*Originally published at https://**www.technopython.com** on September 29, 2021.*