jaskinie: Time travel

Evidence: 100 • authority: 72

Time travel is the hypothetical activity of traveling into the past or future. Time travel is a concept in philosophy, space, time and fiction, particularly science fiction. In fiction, time travel is typically achieved through the use of a device known as a time machine. The idea of a time machine was popularized by H. G. Wells's 1895 novel The Time Machine. It is uncertain whether time travel to the past would be physically possible. Such travel, if at all feasible, may give rise to questions of causality. Forward time travel, outside the usual sense of the perception of time, is an extensively observed phenomenon and is well understood within the framework of special relativity and gener…

Evidence: 44 • authority: 88

Multilevel Explanation of Time Travel and the Grandfather Paradox: The Relationship Between Dynamically Rigid Fractal Spacetime Manifolds and Wormholes. his paper explores the feasibility of time travel within the framework of worm?holes and its resolution of the grandfather paradox, based on the Dynamically RigidFractal Spacetime Manifold (DR-FSTM) theory, combined with quantum gravityand multiverse models. By introducing fractal geometry and non-equilibrium space?time topology analysis, the essential nature of wormholes as inter-level spacetimeconnectors is demonstrated. The study reveals that the behavior of time travelersis constrained by the fractal hierarchical structure, with their c…

Evidence: 44 • authority: 72

Zero-point energy (ZPE) is the lowest possible energy that a quantum mechanical system may have. Unlike in classical mechanics, quantum systems constantly fluctuate in their lowest energy state as described by the Heisenberg uncertainty principle. Therefore, even at absolute zero, atoms and molecules retain some vibrational motion. Apart from atoms and molecules, the empty space of a vacuum also has these properties. According to quantum field theory, the universe can be thought of not as isolated particles but continuous fluctuating fields: matter fields, whose quanta are fermions (in other words, leptons and quarks), and force fields, whose quanta are bosons (such as photons and gluons).…

Evidence: 38 • authority: 80

Traveling time in a spacetime-symmetric extension of nonrelativistic quantum mechanics

Evidence: 38 • authority: 80

Quantum wormholes in Kantowski-Sachs spacetime

Evidence: 38 • authority: 80

Spacetime Probabilities in Nonrelativistic Quantum Mechanics

Evidence: 38 • authority: 72

In theoretical physics, negative mass is a hypothetical type of exotic matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg. Such matter would violate one or more energy conditions and exhibit strange properties such as the oppositely oriented acceleration for an applied force orientation. It is used in certain speculative hypothetical technologies such as time travel to the past and future, construction of traversable artificial wormholes, which may also allow for time travel, Krasnikov tubes, the Alcubierre drive, and potentially other types of faster-than-light warp drives. Currently, the closest known real representative of such exotic matter is a region of neg…

Evidence: — • authority: 72

The theory of relativity comprises two physics theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. Special relativity applies to all physical phenomena in the absence of gravity. General relativity explains the law of gravitation and its relation to the forces of nature. It applies to the cosmological and astrophysical realm, including astronomy. The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It introduced concepts including 4-dimensional spacetime as a unified entity of space and time, relativity of s…

Evidence: — • authority: 72

Some of the major unsolved problems in physics are theoretical, meaning that existing theories are currently unable to explain certain observed phenomena or experimental results. Others are experimental, involving challenges in creating experiments to test proposed theories or to investigate specific phenomena in greater detail. A number of important questions remain open in the area of physics beyond the Standard Model, such as the strong CP problem, determining the absolute mass of neutrinos, understanding matter–antimatter asymmetry, and identifying the nature of dark matter and dark energy. Another significant problem lies within the mathematical framework of the Standard Model itself,…

Evidence: — • authority: 92

100 years of mathematical cosmology: Models, theories and problems, Part B.. We continue our overview of mathematical cosmology with a survey of the third and fourth periods of the development of the subject. The first Part includes the first two periods and is published separately. The third period (1980-2000) continues here with brief descriptions of the main ideas of inflation, the multiverse, quantum, Kaluza-Klein, and string cosmologies, wormholes and baby universes, cosmological stability and modified gravity. The last period, which ends today, includes various more advanced topics such as M-theoretic cosmology, braneworlds, the landscape, topological issues, the measure problem, gene…

Evidence: — • authority: 92

Solvable models of quantum black holes: a review on Jackiw-Teitelboim gravity.. We review recent developments in Jackiw-Teitelboim gravity. This is a simple solvable model of quantum gravity in two dimensions (that arises e.g. from the s-wave sector of higher dimensional gravity systems with spherical symmetry). Due to its solvability, it has proven to be a fruitful toy model to analyze important questions such as the relation between black holes and chaos, the role of wormholes in black hole physics and holography, and the way in which information that falls into a black hole can be recovered.. Authors: Mertens TG, Turiaci GJ.. Journal: Living reviews in relativity. Year: 2023

Evidence: — • authority: 92

Circuit complexity and functionality: A statistical thermodynamics perspective.. Circuit complexity, defined as the minimum circuit size required for implementing a particular Boolean computation, is a foundational concept in computer science. Determining circuit complexity is believed to be a hard computational problem. Recently, in the context of black holes, circuit complexity has been promoted to a physical property, wherein the growth of complexity is reflected in the time evolution of the Einstein-Rosen bridge ("wormhole") connecting the two sides of an anti-de Sitter "eternal" black hole. Here, we are motivated by an independent set of considerations and explore links between complex…