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This paper discusses the quantum mechanics of closed timelike curves (CTC) and of other potential methods for time travel. We analyze a specific proposal for such quantum time travel, the quantum description of CTCs based on post-selected teleportation (P-CTCs). We compare the theory of P-CTCs to previously proposed quantum theories of time travel: the theory is physically inequivalent to Deutsch’s theory of CTCs, but it is consistent with path-integral approaches (which are the best suited for analyzing quantum field theory in curved spacetime). We derive the dynamical equations that a chronology-respecting system interacting with a CTC will experience. We discuss the possibility of time travel in the absence of general relativistic closed timelike curves, and investigate the implications of P-CTCs for enhancing the power of computation.

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Look past the details of a wonky discovery by a group of California scientists — that a quantum state is now observable with the human eye — and consider its implications: Time travel may be feasible. Doc Brown would be proud.

The strange discovery by quantum physicists at the University of California Santa Barbara means that an object you can see in front of you may exist simultaneously in a parallel universe — a multi-state condition that has scientists theorizing that traveling through time may be much more than just the plaything of science fiction writers.

And it’s all because of a tiny bit of metal — a “paddle” about the width of a human hair, an item that is incredibly small but still something you can see with the naked eye.

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John Wheeler, who is mentor to many of today’s leading physicists, and the man who coined the term “black hole”, suggested that the nature of reality was revealed by the bizarre laws of quantum mechanics. According to the quantum theory, before the observation is made, a subatomic particle exists in several states, called a superposition (or, as Wheeler called it, a ‘smoky dragon’). Once the particle is observed, it instantaneously collapses into a single position (a process called ‘decoherence’).

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Japan’s Yamagata University said Friday it has found that a drug being developed for the treatment of Alzheimer’s is also effective in treating amyotrophic lateral sclerosis, more commonly known as Lou Gehrig’s disease.

The drug has been found capable of curbing the abnormal agglomeration of protein that causes the progressive neurodegenerative disease, the state-run university in northeastern Japan said.

People with ALS lose their ability to walk, talk, eat and eventually breathe as the disease kills motor neurons, causing muscles to weaken and eventually paralyze.

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A method for estimating the source properties of gravitational-wave events shows a speed-up of six orders of magnitude over established approaches. This is a promising tool for follow-up observations of electromagnetic counterparts.

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The so-called “mirror-circuit” testing method will help scientists advance the technology behind these super powerful processors. https://bit.ly/3snkgR8

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The James Webb Space Telescope is finally on the launchpad. The space observatory, safely tucked inside an Ariane 5 rocket, is expected to launch on December 25.

The rocket and its precious cargo rolled out to the Arianespace ELA-3 launch complex at Europe’s Spaceport located near Kourou, French Guiana on Wednesday.

The rollout took about two hours to complete, according to NASA.

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