Results 21 to 30 of about 906,607 (253)
Stringy Bubbles Solve de Sitter Troubles
Universe, 2021 Finding four-dimensional de Sitter spacetime solutions in string theory has been a vexing quest ever since the discovery of the accelerating expansion of the universe.
Per Berglund +2 more
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Horizon strings and interior states of a black hole
Physics Letters B, 2015 We provide an explicit construction of classical strings that have endpoints on the horizons of the 2D Lorentzian black hole. We argue that this is a dual description of geodesics that are localized around the horizon which are the Lorentzian ...
K.P. Yogendran
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Suppression of the radiation squeezing in interacting quantum Hall edge channels
New Journal of Physics, 2021 We study the quantum fluctuations of the two quadratures of the emitted electromagnetic radiation generated by a quantum Hall device in a quantum point contact geometry. In particular, we focus our attention on the role played by the unavoidable electron–
G Rebora, D Ferraro, M Sassetti
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INVARIANTS AND INFINITESIMAL TRANSFORMATIONS FOR CONTACT SUB-LORENTZIAN STRUCTURES ON 3-DIMENSIONAL MANIFOLDS. [PDF]
, 2014 In this article we develop some elementary aspects of a theory of symmetry in sub-Lorentzian geometry. First of all we construct invariants characterizing isometric classes of sub-Lorentzian contact 3 manifolds.
Marek Grochowski +3 more
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A regularisation approach to causality theory for C^{1,1}Lorentzian metrics
, 2014 We show that many standard results of Lorentzian causality theory remain valid if the regularity of the metric is reduced to C^{1,1}.
Vickers, J.A. +7 more
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Lorentzian Gromov–Hausdorff theory and finiteness results [PDF]
, 2022 Cheeger–Gromov finiteness results, asserting that there are only finitely many diffeomorphism types of manifolds satisfying certain geometric bounds, feature among the most prominent results in Riemannian geometry.
Müller, Olaf
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Wormhole inspired by non-commutative geometry
Physics Letters B, 2015 In the present Letter we search for a new wormhole solution inspired by noncommutative geometry with the additional condition of allowing conformal Killing vectors (CKV).
Farook Rahaman +3 more
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Non-lorentzian spacetimes [PDF]
, 2022 I review some of my recent work on non-lorentzian geometry. I review the classification of kinematical Lie algebras and their associated Klein geometries. I then describe the Cartan geometries modelled on them and their characterisation in terms of their
Figueroa-O'Farrill, Jose; id_orcid +1 more
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Entropy and Non-Collapse in Lorentzian Geometry
Physics Letters BIn this paper, we establish a geometric correspondence between the Lorentzian Raychaudhuri equation and Perelman’s non-collapsing theorem for the Ricci flow.
Rohit Dhormare
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Kähler metrics via Lorentzian Geometry in dimension four
Complex Manifolds, 2019 Given a semi-Riemannian 4-manifold (M, g) with two distinguished vector fields satisfying properties determined by their shear, twist and various Lie bracket relations, a family of Kähler metrics gK is constructed, defined on an open set in M, which ...
Aazami Amir Babak, Maschler Gideon
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