Journal articles on the topic 'Space-times'

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1

Sonego, Sebastiano. "Ultrastatic space-times." Journal of Mathematical Physics 51, no. 9 (September 2010): 092502. http://dx.doi.org/10.1063/1.3485599.

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2

Placek, Tomasz, and Thomas Müller. "Branching space-times." Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 38, no. 3 (September 2007): 590–92. http://dx.doi.org/10.1016/j.shpsb.2007.06.001.

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3

ELLIS, GEORGE F. R. "THE SPACE OF COSMOLOGICAL SPACE–TIMES." Journal of Hyperbolic Differential Equations 02, no. 02 (June 2005): 331–79. http://dx.doi.org/10.1142/s0219891605000476.

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I first focus on how to best describe the space of cosmological space–times and what its essential properties are and some comments on the dynamical behavior revealed by studies that will be described in more detail by John Wainwright. I will then relate this both to observations and to anthropic issues (i.e. the possible existence of observers). This space includes some viable singularity free solutions which will be briefly described, thus posing the issue of the tension between very special initial conditions and the existence of initial singularities. I will conclude with remarks on the issue of realized infinities in this context and the concept of multiverses.
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4

An, Xinliang, and Willie Wai Yeung Wong. "Warped product space-times." Classical and Quantum Gravity 35, no. 2 (December 19, 2017): 025011. http://dx.doi.org/10.1088/1361-6382/aa8af7.

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5

Ramos, M. P. M., E. G. L. R. Vaz, and J. Carot. "Double warped space–times." Journal of Mathematical Physics 44, no. 10 (2003): 4839. http://dx.doi.org/10.1063/1.1605496.

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6

Haesen, Stefan, and Leopold Verstraelen. "Ideally embedded space–times." Journal of Mathematical Physics 45, no. 4 (April 2004): 1497–510. http://dx.doi.org/10.1063/1.1668333.

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7

Lamoreaux, Steve K. "Testing times in space." Nature 416, no. 6883 (April 2002): 803–4. http://dx.doi.org/10.1038/416803a.

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8

Gen, Uchida, and Tetsuya Shiromizu. "Asymptotically Schwarzschild space–times." Journal of Mathematical Physics 40, no. 4 (April 1999): 2021–31. http://dx.doi.org/10.1063/1.532848.

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9

Hall, G. S., T. Morgan, and Z. Perj�s. "Three-dimensional space-times." General Relativity and Gravitation 19, no. 11 (November 1987): 1137–47. http://dx.doi.org/10.1007/bf00759150.

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10

Kim, Jong‐Chul, and Jin‐Hwan Kim. "Totally vicious space‐times." Journal of Mathematical Physics 34, no. 6 (June 1993): 2435–39. http://dx.doi.org/10.1063/1.530128.

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11

Defever, Filip, Ryszard Deszcz, Leopold Verstraelen, and Luc Vrancken. "On pseudosymmetric space–times." Journal of Mathematical Physics 35, no. 11 (November 1994): 5908–21. http://dx.doi.org/10.1063/1.530718.

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12

Haddow, Barry M. "Purely magnetic space–times." Journal of Mathematical Physics 36, no. 10 (October 1995): 5848–54. http://dx.doi.org/10.1063/1.531291.

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13

BAHNS, DOROTHEA, and STEFAN WALDMANN. "LOCALLY NONCOMMUTATIVE SPACE-TIMES." Reviews in Mathematical Physics 19, no. 03 (April 2007): 273–305. http://dx.doi.org/10.1142/s0129055x0700295x.

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Localized noncommutative structures for manifolds with connection are constructed based on the use of vertical star products. The model's main feature is that two points that are far away from each other will not be subjected to a deviation from classical geometry while space-time becomes noncommutative for pairs of points that are close to one another.
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14

Bugajska, Krystyna. "Spinors and space‐times." Journal of Mathematical Physics 27, no. 3 (March 1986): 853–58. http://dx.doi.org/10.1063/1.527192.

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15

Eschenburg, J. H., and G. J. Galloway. "Lines in space-times." Communications in Mathematical Physics 148, no. 1 (August 1992): 209–16. http://dx.doi.org/10.1007/bf02102373.

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16

Hartong, J., and B. Rollier. "Asymptotically Schrödinger space-times." Fortschritte der Physik 60, no. 9-10 (March 13, 2012): 1044–49. http://dx.doi.org/10.1002/prop.201200038.

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17

Vyas, U. D., and G. M. Akolia. "Causally discontinuous space-times." General Relativity and Gravitation 18, no. 3 (March 1986): 309–14. http://dx.doi.org/10.1007/bf00765889.

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18

Mantica, Carlo Alberto, and Young Jin Suh. "Pseudo-Z symmetric space-times." Journal of Mathematical Physics 55, no. 4 (April 2014): 042502. http://dx.doi.org/10.1063/1.4871442.

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19

Bousso, Raphael. "Holography in general space-times." Journal of High Energy Physics 1999, no. 06 (June 28, 1999): 028. http://dx.doi.org/10.1088/1126-6708/1999/06/028.

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20

Bell, John. "Times Square: Public Space Disneyfied." TDR/The Drama Review 42, no. 1 (March 1998): 24–25. http://dx.doi.org/10.1162/105420498760308643.

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21

DOBARRO, F., and B. UNAL. "Special standard static space–times." Nonlinear Analysis 59, no. 5 (November 2004): 759–70. http://dx.doi.org/10.1016/s0362-546x(04)00286-x.

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22

Dobarro, Fernando, and Bülent Ünal. "Special standard static space–times." Nonlinear Analysis: Theory, Methods & Applications 59, no. 5 (November 2004): 759–70. http://dx.doi.org/10.1016/j.na.2004.07.035.

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23

Gruszczak, Jacek. "Cauchy boundaries of space-times." International Journal of Theoretical Physics 29, no. 1 (January 1990): 37–43. http://dx.doi.org/10.1007/bf00670216.

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24

Barbot, Thierry. "Globally hyperbolic flat space–times." Journal of Geometry and Physics 53, no. 2 (February 2005): 123–65. http://dx.doi.org/10.1016/j.geomphys.2004.05.002.

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25

Hajj‐Boutros, J. "On hypersurface‐homogeneous space‐times." Journal of Mathematical Physics 26, no. 9 (September 1985): 2297–301. http://dx.doi.org/10.1063/1.526812.

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26

Rácz, I. "Causal boundary of space-times." Physical Review D 36, no. 6 (September 15, 1987): 1673–75. http://dx.doi.org/10.1103/physrevd.36.1673.

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27

Clément, Gérard, Dmitri Gal'tsov, and Mourad Guenouche. "Rehabilitating space-times with NUTs." Physics Letters B 750 (November 2015): 591–94. http://dx.doi.org/10.1016/j.physletb.2015.09.074.

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28

Friedrich, Helmut. "On purely radiative space-times." Communications In Mathematical Physics 103, no. 1 (March 1986): 35–65. http://dx.doi.org/10.1007/bf01464281.

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29

Géré, Antoine, Thomas-Paul Hack, and Nicola Pinamonti. "An analytic regularisation scheme on curved space–times with applications to cosmological space–times." Classical and Quantum Gravity 33, no. 9 (April 13, 2016): 095009. http://dx.doi.org/10.1088/0264-9381/33/9/095009.

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30

Crang, Mike. "Temporal Ecologies: Multiple Times, Multiple Spaces, and Complicating Space Times." Environment and Planning A: Economy and Space 44, no. 9 (January 2012): 2119–23. http://dx.doi.org/10.1068/a45438.

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31

Fleury, Pierre, Julien Larena, and Jean-Philippe Uzan. "Gravitational lenses in arbitrary space-times." Classical and Quantum Gravity 38, no. 8 (March 19, 2021): 085002. http://dx.doi.org/10.1088/1361-6382/abea2d.

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32

Gaikwad, Vidya, and T. M. Karade. "Plane symmetric higher dimensional space-times." Acta Physica Hungarica 67, no. 3-4 (June 1990): 259–62. http://dx.doi.org/10.1007/bf03155806.

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33

Chapline, G., and P. O. Mazur. "Superfluid Picture for Rotating Space-Times." Acta Physica Polonica B 45, no. 4 (2014): 905. http://dx.doi.org/10.5506/aphyspolb.45.905.

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34

De, Uday Chand, and Sameh Shenawy. "Generalized quasi-Einstein GRW space-times." International Journal of Geometric Methods in Modern Physics 16, no. 08 (August 2019): 1950124. http://dx.doi.org/10.1142/s021988781950124x.

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Recently, it is proven that generalized Robertson–Walker space-times in all orthogonal subspaces of Gray’s decomposition except one (unrestricted) are perfect fluid space-times. GRW space-times in the unrestricted subspace are identified by having constant scalar curvature. Generalized quasi-Einstein GRW space-times have a constant scalar curvature. It is shown that generalized quasi-Einstein GRW space-times reduce to Einstein space-times or perfect fluid space-times.
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35

KLAINERMAN, SERGIU, and IGOR RODNIANSKI. "BILINEAR ESTIMATES ON CURVED SPACE–TIMES." Journal of Hyperbolic Differential Equations 02, no. 02 (June 2005): 279–91. http://dx.doi.org/10.1142/s0219891605000440.

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To settle the L2 bounded curvature conjecture for the Einstein-vaccum equations one needs to prove bilinear type estimates for solutions of the homogeneous wave equation on a fixed background with H2 local regularity. In this paper we introduce a notion of primitive parametrix for the homogeneous wave equation for which we can prove, under very broad assumptions, the desired bilinear estimates.
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36

ROMERO, C. "ON SECTIONALLY-ELLIPTICAL CONICAL SPACE–TIMES." Modern Physics Letters A 17, no. 02 (January 20, 2002): 83–88. http://dx.doi.org/10.1142/s0217732302005455.

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We consider sectionally-elliptical conical space–times and compute the energy–momentum tensor of the source generating such configurations. It turns out that the problem can be reduced to the calculation of the Gaussian curvature of the bidimensional elliptical cone defined by the foliation t = const. , z = const. We then employ the method of smoothing the conical singularity by taking a sequence of regular bidimensional manifolds in order to compute the curvature. Finally, we conclude that the gravitational effects produced by sectionally-elliptical and sectionally-circular conical space–times are completely equivalent.
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37

Bamford, Sandra, and Gabriele Sturzenhofecker. "Times Enmeshed: Gender, Space, and History." Pacific Affairs 73, no. 1 (2000): 157. http://dx.doi.org/10.2307/2672327.

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38

Podolský, J., O. Hruška, and J. B. Griffiths. "Non-expanding Plebański–Demiański space-times." Classical and Quantum Gravity 35, no. 16 (July 20, 2018): 165011. http://dx.doi.org/10.1088/1361-6382/aacdd5.

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39

Kawai, Hikaru. "Curved Space-Times in Matrix Models." Progress of Theoretical Physics Supplement 171 (2007): 99–109. http://dx.doi.org/10.1143/ptps.171.99.

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40

Ali, F., and T. Feroze. "Cylindrically symmetric gravitational-wavelike space–times." Theoretical and Mathematical Physics 193, no. 2 (November 2017): 1703–14. http://dx.doi.org/10.1134/s0040577917110101.

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41

Jamal, S., A. H. Kara, and R. Narain. "Wave Equations in Bianchi Space-Times." Journal of Applied Mathematics 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/765361.

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We investigate the wave equation in Bianchi type III space-time. We construct a Lagrangian of the model, calculate and classify the Noether symmetry generators, and construct corresponding conserved forms. A reduction of the underlying equations is performed to obtain invariant solutions.
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42

Keane, A. J., R. K. Barrett, and J. F. L. Simmons. "Radiative acceleration in Schwarzschild space-times." Monthly Notices of the Royal Astronomical Society 321, no. 4 (March 11, 2001): 661–77. http://dx.doi.org/10.1046/j.1365-8711.2001.04014.x.

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43

del Castillo, G. F. Torres, and J. R. Delgadillo-Blando. "Geometrical Optics in Stationary Space-Times." General Relativity and Gravitation 33, no. 4 (April 2001): 641–47. http://dx.doi.org/10.1023/a:1010213814044.

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44

Dine, Michael, Patrick J. Fox, and Elie Gorbatov. "Catastrophic Decays of Compactified Space-Times." Journal of High Energy Physics 2004, no. 09 (September 18, 2004): 037. http://dx.doi.org/10.1088/1126-6708/2004/09/037.

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45

GOMERO, G. I., M. J. REBOUÇAS, A. F. F. TEIXEIRA, and A. BERNUI. "TOPOLOGICAL REVERBERATIONS IN FLAT SPACE–TIMES." International Journal of Modern Physics A 15, no. 26 (October 20, 2000): 4141–62. http://dx.doi.org/10.1142/s0217751x00002081.

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We study the role played by multiply-connectedness in the time evolution of the energy E(t) of a radiating system that lies in static flat space–time manifolds ℳ4 whose t= const spacelike sections ℳ3 are compact in at least one spatial direction. The radiation reaction equation of the radiating source is derived for the case where ℳ3 has any nontrivial flat topology, and an exact solution is obtained. We show that the behavior of the radiating energy E(t) changes remarkably from exponential damping, when the system lies in ℛ3, to a reverberation pattern (with discontinuities in the derivative Ė(t) and a set of relative minima and maxima) followed by a growth of E(t), when ℳ3 is endowed with any one of the 17 multiply-connected flat topologies. It emerges from this result that the compactness in at least one spatial direction of Minkowski space–time is sufficient to induce this type of topological reverberation, making clear that topological fragilities can arise not only in the usual cosmological modelling, but also in ordinary flat space–time manifolds. An explicit solution of the radiation reaction equation for the case where [Formula: see text] is discussed in detail, and graphs which reveal how the energy varies with the time are presented and analyzed.
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46

Abdussattar and Babita Dwivedi. "Fluid space–times and conharmonic symmetries." Journal of Mathematical Physics 39, no. 6 (June 1998): 3280–95. http://dx.doi.org/10.1063/1.532441.

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47

Tanimoto, Masayuki. "New varieties of Gowdy space–times." Journal of Mathematical Physics 39, no. 9 (September 1998): 4891–98. http://dx.doi.org/10.1063/1.532497.

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48

Wollensak, Matthias. "Maxwell fields in anisotropic space–times." Journal of Mathematical Physics 39, no. 11 (November 1998): 5934–45. http://dx.doi.org/10.1063/1.532605.

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49

Maudlin, Tim. "A model of classical space‐times." Physics Teacher 27, no. 7 (October 1989): 540–44. http://dx.doi.org/10.1119/1.2342861.

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50

Hartong, Jelle, Elias Kiritsis, and Niels A. Obers. "Lifshitz space–times for Schrödinger holography." Physics Letters B 746 (June 2015): 318–24. http://dx.doi.org/10.1016/j.physletb.2015.05.010.

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