Astronomers have new insight into the power of black holes thanks to their computer code. In the journal Classical & Quantum Gravity, the visual effects team explained how they created the iconic movie images of the blackhole, the wormhole, and other celestial bodies using their computer code. Double Negative, a London-based firm, and Kip Thorne (Caltech theoretical physicist) explained to how the movie’s creative computer code led to new scientific discoveries. Interstellar’s black hole image is a trademark. Researchers discovered that a close-up of a black hole creates more than 12 images of stars within the bright, thin plane of the galaxy. Images that occur as the black hole pulls space-time into a whirling motion, stretching the caustics around it several times, can be concentrated at one edge of its shadow. How would life be for someone living near a blackhole? Caustics effects have not been calculated for cameras near a black hole. These images provide a glimpse into what life would look like for someone orbiting around a blackhole while looking in and out. Computer code created by the engineer mapped the path of millions of light beams, and the evolution of their cross-sections, as they passed through Gargantua’s warped spacetime. This made the discovery possible. Their computer code and its accretion disc allowed them to capture images of the movie’s black hole and wormhole with amazing clarity. A flat, disk-like structure made of gas that spins quickly around larger objects, like a star, white dwarf or black hole, is an accretion disc. They were able see the code and could see the parts of an accretion disc swinging upwards over Gargantua’s shadow as well as the shadow’s Equator. This created a famous picture of a split shadow. Video: Gravitational Lensing using spinning black holes. This is when light from a distant object, bright or bright, causes mysterious distortion. Einstein’s general relativity theory predicted gravitational lensesing. The black hole’s extremely strong gravitational field bends spacetime like a large ball on top of a sheet. The team discovered that using one light ray per pixel of computer code – which is for an IMAX image in this instance, 23 millions pixels – caused flickering stars and nebulae to appear across the screen. Oliver James, Chief Scientist at Double Negative said that “To eliminate flickering and create realistically smooth images for the movie we modified our code in an unusual way.” We used Einstein’s equations to trace the individual paths of the light rays. Instead, we used the distortions and shapes of the light beams to make images. Smooth images are also important to us.” Mr. James said: “Once our code (called DNGR for Double Negative Graditational Renderer) was matured and created the Interstellar images, we realized that we had a tool which could be easily adapted for scientific research.” The visual effects team used DNGR to run a series of simulations to examine the effect of caustics on images of distant starfields as seen from the camera close to a spinning blackhole. James explained that a light beam from any caustic surface is reflected by the black holes and becomes a bright spot of light. The camera close to the blackhole will see all of the caustics wrap around the sky except for one. The DNGR simulation videos showed how the caustics created and destroyed a large number of star images as the camera traveled around a blackhole. It was possible to identify 13 multiple images from the same star and 13 images taken in the bright, thin plane of the galaxy where the black hole is located. Multiple images of the black hole were only created when it was spinning quickly and on its near side. The team also identified multiple images of the galaxy’s thin, bright plane. This was due to the space “flinging out” images from the shadow edges. The scientists discovered that the multi-images of each star existed on the opposite side of the shadow. Space was moving away. Reference: Oliver James, Eugenie von Tunzelmann, Paul Franklin and Kip S Thorne. “Gravitational lensing using spinning black holes in Astrophysics and the Movie Interstellar”. Classical and Quantum Gravity 065001. doi: 10.1088/0264-9381/32/6/065001. Video: Starfield in gravitational lensesing. 1 Video: Starfield in gravitational lensesing. 2 Video: Starfield in gravitational Lensing.
