Superluminal communication is a hypothetical process in which information is conveyed at faster-than-light speeds. The current scientific consensus is that faster-than-light communication is not possible, and to date it has not been achieved in any experiment.
A tachyon or tachyonic particle is a hypothetical particle that always travels faster than light. Physicists believe that faster-than-light particles cannot exist because they are inconsistent with the known laws of physics. If such particles did exist they could be used to send signals faster than light and into the past. According to the theory of relativity this would violate causality, leading to logical paradoxes such as the grandfather paradox. Tachyons would exhibit the unusual property of increasing in speed as their energy decreases, and would require infinite energy to slow to the speed of light. No verifiable experimental evidence for the existence of such particles has been found.
Gregory Benford is an American science fiction author and astrophysicist who is professor emeritus at the department of physics and astronomy at the University of California, Irvine. He is a contributing editor of Reason magazine.
Robert Lull Forward was an American physicist and science fiction writer. His literary work was noted for its scientific credibility and use of ideas developed from his career as an aerospace engineer. He also made important contributions to gravitational wave detection research.
Charles Sheffield, was an English-born mathematician, physicist and science-fiction writer who served as a President of the Science Fiction and Fantasy Writers of America and of the American Astronautical Society.
John Joseph Vincent Kessel is an American author of science fiction and fantasy. He is a prolific short story writer, and the author of four solo novels, Good News From Outer Space (1989), Corrupting Dr. Nice (1997), The Moon and the Other (2017), and Pride and Prometheus (2018), and one novel, Freedom Beach (1985) in collaboration with his friend James Patrick Kelly. Kessel is married to author Therese Anne Fowler.
Cherry Barbara Grimm, better known by the pseudonym Cherry Wilder, was a New Zealand science fiction and fantasy writer.
Patrice Ann "Pat" Murphy is an American science writer and author of science fiction and fantasy novels.
A temporal paradox, time paradox, or time travel paradox, is a paradox, an apparent contradiction, or logical contradiction associated with the idea of time travel or other foreknowledge of the future. While the notion of time travel to the future complies with the current understanding of physics via relativistic time dilation, temporal paradoxes arise from circumstances involving hypothetical time travel to the past – and are often used to demonstrate its impossibility.
David Geddes Hartwell was an American critic, publisher, and editor of thousands of science fiction and fantasy novels. He was best known for work with Signet, Pocket, and Tor Books publishers. He was also noted as an award-winning editor of anthologies. The Encyclopedia of Science Fiction describes him as "perhaps the single most influential book editor of the past forty years in the American [science fiction] publishing world".
The hypothetical particles tachyons, defined through being faster than light, have inspired many occurrences in fiction. In general, tachyons are a standby mechanism upon which many science fiction authors rely to establish faster-than-light communication, with or without reference to causality issues, as well as a means to achieve faster-than-light travel. Science writer Sidney Perkowitz commented "that the very word "tachyon," because of its unusual Greek-origin spelling and engagingly catchy hard "ch" sound, lends a certain "science-ness" or "science coolness to fiction." Starting in the 1970s, tachyons were used in science-fiction to present a seemingly-plausible explanation for time travel and communication through time. Peter Nicholls, in The Encyclopedia of Science Fiction, describes Gregory Benford's Timescape (1980) as the first work to use tachyons to this effect "with some care", where scientists send a message to the past trying to change history. Glen Cook's 1985 novel A Matter of Time features a much less stringently described "tachyon generator" to "transmit [both to the past and] to the far future". Uses of the concept for space travel appeared in association with "the Asgard, the benevolent alien race in the Stargate SG-1 television series (1997–2007)", and in the 2001 film K-Pax, which coined the term "tachyonic speeds" for "multiples of light speed". An "unabashed" use appeared already in 1969, where "Bob Shaw's The Palace of Eternity features such delights as a million-ton tachyonic spaceship travelling at 30,000 times the speed of light." In the Star Trek franchise, in addition to facilitating faster-than-light travel, tachyons have been mentioned "for varied purposes, including cloaking a spacecraft, detection" of such cloaking and overcoming defensive shields, which has been regarded as "technobabble" by Mashable contributor Keith Wagstaff: dialogue that implies a scientific explanation, using a term with a real scientific concept behind it, "but really doesn't mean much."
Gordon Eklund is an American science fiction author whose works include the "Lord Tedric" series and two of the earliest original novels based on the 1960s Star Trek TV series. He has written under the pen name Wendell Stewart, and in one instance under the name of the late E. E. "Doc" Smith.
Retrocausality, or backwards causation, is a concept of cause and effect in which an effect precedes its cause in time and so a later event affects an earlier one. In quantum physics, the distinction between cause and effect is not made at the most fundamental level and so time-symmetric systems can be viewed as causal or retrocausal. Philosophical considerations of time travel often address the same issues as retrocausality, as do treatments of the subject in fiction, but the two phenomena are distinct.
Black holes, objects whose gravity is so strong that nothing—including light—can escape them, have been depicted in fiction since at least the pulp era of science fiction, before the term black hole was coined. A common portrayal at the time was of black holes as hazards to spacefarers, a motif that has also recurred in later works. The concept of black holes became popular in science and fiction alike in the 1960s. Authors quickly seized upon the relativistic effect of gravitational time dilation, whereby time passes more slowly closer to a black hole due to its immense gravitational field. Black holes also became a popular means of space travel in science fiction, especially when the notion of wormholes emerged as a relatively plausible way to achieve faster-than-light travel. In this concept, a black hole is connected to its theoretical opposite, a so-called white hole, and as such acts as a gateway to another point in space which might be very distant from the point of entry. More exotically, the point of emergence is occasionally portrayed as another point in time—thus enabling time travel—or even an entirely different universe.
Thrice Upon A Time is a science fiction novel by British writer James P. Hogan, first published in 1980. Unlike most other time travel stories, Thrice Upon A Time considers the ramifications of sending messages into the past and/or receiving messages from the future, rather than the sending of physical objects through time.
A tachyonic antitelephone is a hypothetical device in theoretical physics that could be used to send signals into one's own past. Albert Einstein in 1907 presented a thought experiment of how faster-than-light signals can lead to a paradox of causality, which was described by Einstein and Arnold Sommerfeld in 1910 as a means "to telegraph into the past". The same thought experiment was described by Richard Chace Tolman in 1917; thus, it is also known as Tolman's paradox.
Timescape Books was a science fiction line from Pocket Books operating from 1981 to 1985. Pocket Books is an imprint of Simon & Schuster.
Particle accelerators in popular culture appear in popular science books, fictional literature, feature films, TV series and other media which include particle accelerators as part of their content. Particle physics, fictional or scientific, is an inherent part of this topic.
The Ditmar Award has been awarded annually since 1969 at the Australian National Science Fiction Convention to recognise achievement in Australian science fiction and science fiction fandom. The award is similar to the Hugo Award but on a national rather than international scale.
A bibliography of works by American science fiction author Gregory Benford.
