Results 61 to 70 of about 43,733 (300)

From Wormholes to the Warp Drive: Using theoretical physics to place ultimate bounds on technology [PDF]

, 2002
The serious study of such science fiction staples as wormholes, time travel, and the warp drive, as a means of understanding and constraining possible realistic solutions within General Relativity is reviewed.Comment: 10 pages LaTeX; to appear in Phi ...
Hiscock, William A.
core   +1 more source

Supersymmetry Breaking Casimir Warp Drive

AIP Conference Proceedings, 2007
This paper utilizes a recent model which relates the cosmological constant to the Casimir energy of the extra dimensions in brane‐world theories. The objective of this paper is to demonstrate that, given some sufficiently advanced civilization with the ability to manipulate the radius of the extra dimension, a local adjustment of the cosmological ...
Richard K. Obousy, Gerald Cleaver
openaire   +3 more sources

Adult‐Onset Subacute Sclerosing Panencephalitis Presenting With Subacute Cognitive Deficits

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT We describe the case of a 41‐year‐old man diagnosed with adult‐onset subacute sclerosing panencephalitis (SSPE). The patient presented with subacute progressive cognitive deficits and a neuropsychological profile indicating predominant frontoparietal dysfunction. MRI showed only mild parietal‐predominant cerebral atrophy.
Dennis Yeow, Nicola McKern, Vincent Oxenham, Kate Ahmad, Omar Ahmad   +4 more
wiley   +1 more source

Diffusion Spectrum Imaging Maps Early Axonal Loss and a Unique Progressive Signal in Neuronal Intranuclear Inclusion Disease

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective To delineate specific in vivo white matter pathology in neuronal intranuclear inclusion disease (NIID) using diffusion spectrum imaging (DSI) and define its clinical relevance. Methods DSI was performed on 42 NIID patients and 38 matched controls.
Kaiyan Jiang, Yixiu Pei, Xiaobao Hu, Ying Xiong, Fang Wang, Yanyan Yu, Min Zhu, Dandan Tan, Meihong Zhou, Daojun Hong, Fuqing Zhou   +10 more
wiley   +1 more source

Retractions in Rheumatology: Trends, Causes, and Implications for Research Integrity

Arthritis Care &Research, EarlyView.
Objective We aimed to describe the trends and main reasons for study retraction in rheumatology literature. Methods We reviewed the Retraction Watch database to identify retracted articles in rheumatology. We recorded the main study characteristics, authors’ countries, reasons for retraction, time from publication to retraction, and trends over time ...
Anna Maria Vettori, Michele Iudici
wiley   +1 more source

Generalized Warped Disk Equations

, 2019
The manner in which warps in accretion disks evolve depends on the magnitude of the viscosity. ...
Franchini, Alessia, Lepp, Stephen, Lubow, Stephen H., Martin, Rebecca G., Nealon, Rebecca, Nixon, C. J., Pringle, J. E., Vallet, David, Zhu, Zhaohuan   +8 more
core   +2 more sources

A Q‐Learning Algorithm to Solve the Two‐Player Zero‐Sum Game Problem for Nonlinear Systems

International Journal of Adaptive Control and Signal Processing, Volume 39, Issue 3, Page 566-581, March 2025.
A Q‐learning algorithm to solve the two‐player zero‐sum game problem for nonlinear systems. ABSTRACT This paper deals with the two‐player zero‐sum game problem, which is a bounded L2$$ {L}_2 $$‐gain robust control problem. Finding an analytical solution to the complex Hamilton‐Jacobi‐Issacs (HJI) equation is a challenging task.
Afreen Islam, Anthony Siming Chen, Guido Herrmann   +2 more
wiley   +1 more source

Falling into the Past: Geodesics in a Time Travel Metric

Universe
We investigate timelike and null geodesics within the rotating “time machine” spacetime proposed by Ralph, T.C.; et al. Phys. Rev. D 2020, 102, 124013. This is a rotating analogue of Alcubierre’s warp drive spacetime.
Colin MacLaurin, Fabio Costa, Timothy C. Ralph   +2 more
doaj   +1 more source

Warp Field Mechanics 101 [PDF]

, 2011
This paper will begin with a short review of the Alcubierre warp drive metric and describes how the phenomenon might work based on the original paper. The canonical form of the metric was developed and published in [6] which provided key insight into the
White, Harold
core   +1 more source

The Generalized Second Law implies a Quantum Singularity Theorem

, 2016
The generalized second law can be used to prove a singularity theorem, by generalizing the notion of a trapped surface to quantum situations. Like Penrose's original singularity theorem, it implies that spacetime is null geodesically incomplete inside ...
Alcubierre M, Aron C Wall, Ashtekar A, Banks T, Berglund P Bhattacharyya J Mattingly D, Bernal A N, Blas D Sibiryakov S, Brandenberger R H, Carroll S M Chen J, Delbrück M, Demers J-G Lafrance R Myers R C, Freivogel B, Gao S, Guendelman E I, Hacquebord F, Hiscock W A, Jacobson T, Lobo F S N, Lobo F S N, Marolf D, Misner C W, Page D N, Penrose R Sorkin R D Woolgar E, Pfenning M J, Sahlmann H, Smolin L, Smolin L, Smolin L, Sorkin R D, Sorkin R D, Sorkin R D, Uhlmann A, Uhlmann A, Uhlmann A, Van Den Broeck C, Veneziano G, Wall A C, Wallden P, Wheeler J A, Woolgar E   +39 more
core   +1 more source