scholarly journals Asymptotics with a positive cosmological constant. IV. The no-incoming radiation condition

2019 ◽  
Vol 100 (2) ◽  
Author(s):  
Abhay Ashtekar ◽  
Sina Bahrami
Keyword(s):  
Cosmological Constant ◽  
Radiation Condition ◽  
Positive Cosmological Constant ◽  
Incoming Radiation

scholarly journals Gravitational radiation condition at infinity with a positive cosmological constant

2020 ◽  
Vol 102 (10) ◽  
Author(s):  
Francisco Fernández-Álvarez ◽  
José M. M. Senovilla
Keyword(s):  
Cosmological Constant ◽  
Gravitational Radiation ◽  
Radiation Condition ◽  
Positive Cosmological Constant

scholarly journals Neutral signature gauged supergravity solutions

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
J. Gutowski ◽  
W. A. Sabra
Keyword(s):  
Cosmological Constant ◽  
Geometric Structure ◽  
Base Space ◽  
Killing Spinor ◽  
Positive Cosmological Constant ◽  
3 Dimensional

Abstract We classify all supersymmetric solutions of minimal D = 4 gauged supergravity with (2) signature and a positive cosmological constant which admit exactly one Killing spinor. This classification produces a geometric structure which is more general than that found for previous classifications of N = 2 supersymmetric solutions of this theory. We illustrate how the N = 2 solutions which consist of a fibration over a 3-dimensional Lorentzian Gauduchon-Tod base space can be written in terms of this more generic geometric structure.

scholarly journals Catalytic creation of baby bubble universe with small positive cosmological constant

2019 ◽  
Vol 2019 (10) ◽  
Author(s):  
Issei Koga ◽  
Yutaka Ookouchi
Keyword(s):  
Cosmological Constant ◽  
Positive Cosmological Constant

scholarly journals A positive cosmological constant in string theory through AdS/CFT wormholes

2001 ◽  
Vol 609 (3) ◽  
pp. 325-343 ◽  
Author(s):  
Brett McInnes
Keyword(s):  
String Theory ◽  
Cosmological Constant ◽  
Positive Cosmological Constant

scholarly journals Satisfiability modulo theories and chiral heterotic string vacua with positive cosmological constant

2021 ◽  
pp. 136187
Author(s):  
Alon E. Faraggi ◽  
Benjamin Percival ◽  
Sven Schewe ◽  
Dominik Wojtczak
Keyword(s):  
Cosmological Constant ◽  
Satisfiability Modulo Theories ◽  
Heterotic String ◽  
Positive Cosmological Constant

scholarly journals Relationship between Bondi–Sachs quantities and source of gravitational radiation in asymptotically de Sitter spacetime

2018 ◽  
Vol 27 (04) ◽  
pp. 1850046 ◽  
Author(s):  
Xiaokai He ◽  
Jiliang Jing ◽  
Zhoujian Cao
Keyword(s):  
Cosmological Constant ◽  
Gravitational Wave ◽  
Gravitational Radiation ◽  
The Other ◽  
Perturbation Approach ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Positive Cosmological Constant ◽  
Sitter Spacetime ◽  
Explicit Expressions

Gravitational radiation plays an important role in astrophysics. Based on the fact that our universe is expanding, the gravitational radiation when a positive cosmological constant is presented has been studied along with two different ways recently, one is the Bondi–Sachs (BS) framework in which the result is shown by BS quantities in the asymptotic null structure, the other is the perturbation approach in which the result is presented by the quadrupoles of source. Therefore, it is worth to interpret the quantities in asymptotic null structure in terms of the information of the source. In this paper, we investigate this problem and find the explicit expressions of BS quantities in terms of the quadrupoles of source in asymptotically de Sitter spacetime. We also estimate how far away the source is, the cosmological constant may affect the detection of the gravitational wave.

scholarly journals A new way to derive the Taub-NUT metric with positive cosmological constant

2017 ◽  
Vol 58 (8) ◽  
pp. 082501 ◽  
Author(s):  
Kento Osuga ◽  
Don N. Page
Keyword(s):  
Cosmological Constant ◽  
Positive Cosmological Constant

scholarly journals Asymptotics with a positive cosmological constant. II. Linear fields on de Sitter spacetime

2015 ◽  
Vol 92 (4) ◽  
Author(s):  
Abhay Ashtekar ◽  
Béatrice Bonga ◽  
Aruna Kesavan
Keyword(s):  
Cosmological Constant ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Positive Cosmological Constant ◽  
Sitter Spacetime

scholarly journals Asymptotically equivalent functions and ultrafilters applied to noncommutative quantum cosmology

2019 ◽  
Vol 65 (5 Sept-Oct) ◽  
pp. 519
Author(s):  
J.A. Astorga-Moreno ◽  
E.A. Mena Barboza ◽  
And M.A. García-Aspeitia
Keyword(s):  
Dynamical System ◽  
Cosmological Constant ◽  
Commutation Relation ◽  
Quantum Cosmology ◽  
Positive Cosmological Constant ◽  
Classical Approximation ◽  
Noncommutative Quantum

Using the semi-classical approximation to the Wheeler-DeWitt equation obtained via Arnowitt-Deser-Misner (ADM) formalism in the Friedmann-Lemaitre-Robertson-Walker (FLRW) model coupled to a scalar eld and positive cosmological constant, and in the Kantowski-Sachs (KS) Universe, we introduced a deformation on the commutation relation for the minisuperspace variables and find an explicit semiclassical expression equivalent, in an adequate limit, to the solution with the aid of asymptotically equal functions and the theory of Ultralters, oering a suggestive alternative to sketch the behavior of the dynamical system involved without the need to solve it numerically.

Sign in / Sign up

Export Citation Format

Share Document