Výsledky vyhledávání

The Differentiability of Horizons Along Their Generators

Autor: D. Szeghy

Publikováno v: Annales Henri Poincaré. 24:1289-1304

Let H be a (past directed) horizon in a time-oriented Lorentz manifold and $$\gamma :[\left( \alpha ,\beta \right) \rightarrow H$$ γ : [ α , β → H a past directed generator of the horizon, where $$[\left( \alpha ,\beta \right) $$ [ α , β is $$

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::72d9e1f79fb7a6b0e3ccae039cf8ed94
https://doi.org/10.1007/s00023-023-01272-7

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On the infinitesimal orbit type of maximal dimensional orbits

Autor: D. Szeghy

Publikováno v: Differential Geometry and its Applications. 35:86-105

We prove that in the case of an isometric action α : G × M → M of a Lie group G on a semi-Riemannian manifold M the union of the maximal dimensional orbits is an open and dense set in M. Moreover, if M is a Lorentz manifold and α is an isometric

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::987f32687e699e0c9c52ce96ed02c1c5
https://doi.org/10.1016/j.difgeo.2014.04.013

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Infinitesimal orbit type theorem for normalizable actions

Autor: D. Szeghy

Publikováno v: Indagationes Mathematicae. 25:104-112

Let α : G × M → M be a differentiable action of a Lie group G on a connected differentiable manifold M . Assume that the local tube theorem holds at every x ∈ M . Then the following is proved: there is a maximal infinitesimal orbit type, called

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::550b1c2ef5fedb77e73db2da27cd6869
https://doi.org/10.1016/j.indag.2013.07.010

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Akademický článek

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On the conjugate locus of pseudo-Riemannian manifolds

Autor: D. Szeghy

Publikováno v: Indagationes Mathematicae. 19(3):465-480

Let expm :TmM → M be the exponential map of a Riemannian manifold M at a point m ∈ M. Warner proved that in any neighbourhood of a conjugate point in TmM, the map expm is not injective. Moreover, he described the exponential map in a suitable coo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e07ce0f91fb95877507f4b2c3c10fe31

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On the differentiability order of horizons

Autor: D Szeghy

Publikováno v: Classical and Quantum Gravity. 33:125003

Let M be a time oriented Lorentzian manifold and a horizon. We will show that the differentiability order of the horizon can change only once along a generator, i.e. the following holds. If is a generator, thus, an inextendable past directed light-li

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::324588275254db0f46c83d546895698a
https://doi.org/10.1088/0264-9381/33/12/125003

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Akademický článek

Magnetic-Responsive Liposomal Hydrogel Membranes for Controlled Release of Small Bioactive Molecules—An Insight into the Release Kinetics.

Autor: Pereira, Luís¹ (AUTHOR) lfc.pereira@campus.fct.unl.pt, Ferreira, Frederico Castelo^2,3 (AUTHOR) frederico.ferreira@ist.utl.pt, Pires, Filipa¹ (AUTHOR) af.pires@campus.fct.unl.pt, Portugal, Carla A. M.¹ (AUTHOR) af.pires@campus.fct.unl.pt

Publikováno v: Membranes. Jul2023, Vol. 13 Issue 7, p674. 28p.

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