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Category: cosmology – Page 222

How to Build A Time Machine — Paul Davies

Time travel makes great science fiction, but can it really be done? Travel into the future is already a reality, but visiting the past is a much tougher proposition, and may require fantastic resources such as a wormhole in space. Nevertheless, if going back in time is allowed, even in principle, then what about all those paradoxes that make time travel stories so intriguing?

Paul Davies is a physicist, cosmologist and astrobiologist at Arizona State University, where he is Director of the Beyond Center for Fundamental Concepts in Science. He is the author of many books, including “How to Build a Time Machine” and, most recently, “The Eerie Silence: are we alone in the universe?”

Volunteers are using a Tinder-like app to help build the world’s largest 3D map of the cosmos

Swipe right to uncover the mysteries of dark energy.

A group of more than 10,000 amateur astronomers spread out over 85 countries has identified roughly 240,000 galaxies over the last two years. Now, the Dark Energy Explorers group aims to recruit even more volunteers and take its work to the next level with a project that could shed new light on the mysterious nature of dark energy, a press statement reveals.

To do so, they must help build the most extensive 3D map of the cosmos by using an app that functions surprisingly like the popular dating app Tinder.

Uladzimir Zuyeu/iStock.

Now, the Dark Energy Explorers group aims to recruit even more volunteers and take its work to the next level with a project that could shed new light on the mysterious nature of dark energy, a press statement reveals.

Scientists create ‘baby’ wormhole as sci-fi moves closer to fact

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In science fiction – think films and TV like “Interstellar” and “Star Trek” – wormholes in the cosmos serve as portals through space and time for spacecraft to traverse unimaginable distances with ease. If only it were that simple.

Scientists have long pursued a deeper understanding of wormholes and now appear to be making progress. Researchers announced on Wednesday that they forged two minuscule simulated black holes – those extraordinarily dense celestial objects with gravity so powerful that not even light can escape – in a quantum computer and transmitted a message between them through what amounted to a tunnel in space-time.

Physicists observe wormhole dynamics using a quantum computer

Scientists have, for the first time, developed a quantum experiment that allows them to study the dynamics, or behavior, of a special kind of theoretical wormhole. The experiment has not created an actual wormhole (a rupture in space and time), rather it allows researchers to probe connections between theoretical wormholes and quantum physics, a prediction of so-called quantum gravity. Quantum gravity refers to a set of theories that seek to connect gravity with quantum physics, two fundamental and well-studied descriptions of nature that appear inherently incompatible with each other.

“We found a that exhibits key properties of a gravitational wormhole yet is sufficiently small to implement on today’s quantum hardware,” says Maria Spiropulu, the principal investigator of the U.S. Department of Energy Office of Science research program Quantum Communication Channels for Fundamental Physics (QCCFP) and the Shang-Yi Ch’en Professor of Physics at Caltech. “This work constitutes a step toward a larger program of testing quantum gravity physics using a quantum computer. It does not substitute for direct probes of quantum gravity in the same way as other planned experiments that might probe quantum gravity effects in the future using quantum sensing, but it does offer a powerful testbed to exercise ideas of quantum gravity.”

The research will be published December 1 in the journal Nature. The study’s first authors are Daniel Jafferis of Harvard University and Alexander Zlokapa (BS ‘21), a former undergraduate student at Caltech who started on this project for his bachelor’s thesis with Spiropulu and has since moved on to graduate school at MIT.

Researchers Find Massive Structure in Deep Space That Could Break our Understanding of the Cosmos

Observations of thousands of galaxies made with the Sloan Digital Sky Survey telescope (pictured) have revealed a giant arc of galaxies, which refutes the theory of their uniform distribution in the Universe. However, the existence of the large-scale structure discovered by astronomers from the UK and the United States needs to be confirmed by other observations to be accepted.

During the virtual conference of the American Astronomical Society, scientists announced the discovery and study of a “Giant Arc,” which consists of ancient galaxies.

Alexia Lopez and her colleagues analyzed the light of about 40,000 distant quasars recorded during the SDSS survey. These are some of the brightest objects in the Universe and are believed to represent the active nuclei of distant galaxies containing supermassive black holes.

Making a Traversable Wormhole with a Quantum Computer

Wormholes — wrinkles in the fabric of spacetime that connect two disparate locations — may seem like the stuff of science fiction. But whether or not they exist in reality, studying these hypothetical objects could be the key to making concrete the tantalizing link between information and matter that has bedeviled physicists for decades.

Surprisingly, a quantum computer is an ideal platform to investigate this connection. The trick is to use a correspondence called AdS/CFT, which establishes an equivalence between a theory that describes gravity and spacetime (and wormholes) in a fictional world with a special geometry (AdS) to a quantum theory that does not contain gravity at all (CFT).

In “Traversable wormhole dynamics on a quantum processor”, published in Nature today, we report on a collaboration with researchers at Caltech, Harvard, MIT, and Fermilab to simulate the CFT on the Google Sycamore processor. By studying this quantum theory on the processor, we are able to leverage the AdS/CFT correspondence to probe the dynamics of a quantum system equivalent to a wormhole in a model of gravity. The Google Sycamore processor is among the first to have the fidelity needed to carry out this experiment.