Results 11 to 20 of about 383,237 (301)

Quantum Complex Scalar Field in the Two-Dimensional Spacetime with Closed Timelike Curves and a Time-Machine Problem [PDF]

open access: yes, 1994
It is considered the quantum complex scalar field which obeys the authomorphic condition in the two-dimensional spacetime with closed timelike curves and the chronology horizon. The renormalized stress-energy tensor is obtained.
Abramowitz M   +16 more
core   +2 more sources

Characteristics and outcomes of colorectal cancer surgery by age in a tertiary center in Korea: a retrospective review [PDF]

open access: yesAnnals of Coloproctology, 2022
Purpose Colorectal cancer (CRC) occurs in all age groups, and the application of treatment may vary according to age. The study was designed to identify the characteristics of CRC by age. Methods A total of 4,326 patients undergoing primary resection for
Tae-Hoon Lee   +8 more
doaj   +1 more source

Freshwater reservoir effects in the Eurasian Steppe zone and their influence on the radiocarbon ages of bone sample

open access: yesВестник археологии, антропологии и этнографии, 2016
Reservoir effects often hinder the accuracy of the radiocarbon dates from human and animal bone samples. The freshwater reservoir effect (FRE) refers to the difference between the radiocarbon age of the purely terrestrial sample (the 14C content of which
Svyatko S.V.
doaj   +1 more source

Deuterium–hydrogen ratios, electrical conductivity and nitrate for high-resolution dating of polar ice cores

open access: yesTellus: Series B, Chemical and Physical Meteorology, 2020
In order to support the very high time resolution required to observe short-term variations in nitrates and all other ions represented by electrical conductivity in polar ice, a Fourier transform infrared spectrometer was developed for measurement of ...
Gisela Dreschhoff   +2 more
doaj   +1 more source

Current State of Knowledge of the Development of Early Modern Ceramics in the Czech Republic

open access: yesArchaeologia Polona, 2021
This study is an overview of the professional interest in archaeology of the modern age in the Czech Republic. Increased interest in the archaeology of the Modern period came after the year 2000.
Gabriela Blažková
doaj   +1 more source

Models for Chronology Selection [PDF]

open access: yes, 1997
In this paper, we derive an expression for the grand canonical partition function for a fluid of hot, rotating massless scalar field particles in the Einstein universe.
B. S. Kay   +16 more
core   +3 more sources

Quantum time machine [PDF]

open access: yes, 1997
The continuation of Misner space into the Euclidean region is seen to imply the topological restriction that the period of the closed spatial direction becomes time-dependent.
B. Jensen   +27 more
core   +3 more sources

Hagedorn transition and chronology protection in string theory [PDF]

open access: yes, 2005
We conjecture chronology is protected in string theory due to the condensation of light winding strings near closed null curves. This condensation triggers a Hagedorn phase transition, whose end-point target space geometry should be chronological ...
Adams   +58 more
core   +4 more sources

Time in Early Modern Islam: Calendar, Ceremony, and Chronology in the Safavid, Mughal and Ottoman Empires [Book Review] [PDF]

open access: yes, 2013
This article reviews the book 'Time in Early Modern Islam: Calendar, Ceremony, and Chronology in the Safavid', Mughal and Ottoman Empires, by Stephen P ...
Drury, Abdullah
core   +2 more sources

On causality and superluminal behavior in classical field theories. Applications to k-essence theories and MOND-like theories of gravity [PDF]

open access: yes, 2006
Field theories whose full action is Lorentz invariant (or diffeomorphism invariant) can exhibit superluminal behaviors through the breaking of local Lorentz invariance. Quantum induced superluminal velocities are well-known examples of this effect.
Bruneton, Jean-Philippe
core   +3 more sources

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