Results 11 to 20 of about 6,634,346 (295)

Path Integral Approach to Noncommutative Space-Times [PDF]

open access: yes, 1997
We propose a path integral formulation of noncommutative generalizations of spacetime manifold in even dimensions, characterized by a length scale $\lambda_P$.
Mangano, Gianpiero
core   +2 more sources

A Phase Space Approach to Gravitational Enropy [PDF]

open access: yes, 1999
We examine the definition S = ln Omega as a candidate "gravitational entropy" function. We calculate its behavior for gravitationl and density perturbations in closed, open and flat cosmologies and find that in all cases it increases monotonically. Using
B. Hu   +14 more
core   +2 more sources

An embedding space approach to Carrollian CFT correlators for flat space holography

open access: yesJournal of High Energy Physics, 2023
Carrollian conformal field theories (carrollian CFTs) are natural field theories on null infinity of an asymptotically flat spacetime or, more generally, geometries with conformal carrollian structure. Using a basis transformation, gravitational S-matrix
Jakob Salzer
doaj   +1 more source

\(T_1\) approach spaces

open access: yesCommunications Faculty Of Science University of Ankara Series A1Mathematics and Statistics, 2019
Summary: In this paper, we characterize both \(T_1\) and local \(T_1\) limit (resp. gauge) approach spaces as well as show how these concepts are related to each other. Finally, we compare these \(T_1\) and the usual \(T_1\) approach spaces.
Baran, Mehmet, Qasim, Muhammad
openaire   +6 more sources

Quantifying completion

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2000
Approach uniformities were introduced in Lowen and Windels (1998) as the canonical generalization of both metric spaces and uniform spaces. This text presents in this new context of “quantitative” uniform spaces, a reflective completion theory which ...
Robert Lowen, Bart Windels
doaj   +1 more source

Functorial approach structures

open access: yesApplied General Topology, 2003
We show that there exists at least a proper class of functorial approach structures, i.e., right inverses to the forgetful functor T : AP→ Top (where AP denotes the topological construct of approach spaces and contractions as introduced by R.
Guillaume C.L. Brümmer, Mark Sioen
doaj   +1 more source

Multi-Robot Space Exploration: An Augmented Arithmetic Approach

open access: yesIEEE Access, 2021
Space exploration refers to constructing a map with the aid of sensor data. This exploration is achieved utilizing a group of robots in an obstacle cluttered environment and distributing tasks amongst these robot(s). The robotic configuration is equipped
Faiza Gul   +3 more
doaj   +1 more source

A conceptual approach for noncontact calorimetry in space [PDF]

open access: yes, 1991
A concept is developed and described which allows to measure the heat capacity and the effective thermal conductivity of stable and undercooled liquid metals and alloys in an electromagnetic levitation apparatus.
Fecht, H. J., Johnson, W. L.
core   +1 more source

A quasitopos containing CONV and MET as full subcategories

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1988
We show that convergence spaces with continuous maps and metric spaces with contractions, can be viewed as entities of the same kind. Both can be characterized by a “limit function” λ which with each filter ℱ associates a map λℱ from the underlying set ...
E. Lowen, R. Lowen
doaj   +1 more source

Nonextensive entropy approach to space plasma fluctuations and turbulence [PDF]

open access: yes, 2006
Spatial intermittency in fully developed turbulence is an established feature of astrophysical plasma fluctuations and in particular apparent in the interplanetary medium by in situ observations.
Baumjohann, W.   +2 more
core   +2 more sources

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