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Showing 1 to 6 of 6 for “"Spacetime Metric"”.
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Obtaining the spacetime metric from cosmological observations
… have a numerical programme for determining the metric of the universe from standard observations. This project is the beginning of a series of developments on such a numerical implementation. It is sensible to start with a simple case - that of spherical symmetry and a dust equation of state. …
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Paracausal deformations, M{\o}ller operators, and Hadamard states in CCR AQFT.
… and algebraic quantum field theories in curved spacetime. In particular, the main question is: how do the theories change under finite global variations of the spacetime metric tensor? To answer this question a new deformation tool, the paracausal deformation, is developed and studied on its own …
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Merging black hole binaries in gaseous environments: simulations in general-relativistic magnetohydrodynamics
… embedded in gaseous environments. We evolve the metric using the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formulation with standard moving puncture gauge conditions and handle the magnetohydrodynamics via a high-resolution shock-capturing (HRSC) scheme. In the limit of negligible gas angular …
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Initial Conditions for Cosmic Inflation, the History of the Dark Sector, and Dark-Onium
… inhomogeneities in the matter field and spacetime metric during inflation. Then a new approach for analyzing the onset of inflation amid backreaction from significant inhomogeneities is presented. This new approach incorporates certain nonlinear interactions among the coupled degrees of …
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Topics in relativistic cosmology: Cosmology on the past lightcone and in modified gravitation
… We develop this gauge by producing a perturbed spacetime metric that describes the geometry of our past lightcone where observations are usually obtained. We then connect the produced observational metric to the perturbed Friedmann-Lemaître-Robertson-Walker metric in the standard general gauge …
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Computing the Evolution of Compact Stars in 3+1 General Relativity
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-11T20:49:42Z No. of bitstreams: 1 Duez.pdf: 3795918 bytes, checksum: ff01a186d01a5f11063c41f4b96e1478 (MD5)