Results 21 to 30 of about 295,670 (287)

Gravitational Collapse and Singularity Removal in Rastall Theory

Advances in High Energy Physics, 2021
In the present work, we study spherically symmetric gravitational collapse of a homogeneous fluid in the framework of Rastall gravity. Considering a nonlinear equation of state (EoS) for the fluid profiles, we search for a class of nonsingular collapse ...
Ehsan Dorrani
doaj   +1 more source

Towards a Big Crunch Dual [PDF]

, 2004
We show there exist smooth asymptotically anti-de Sitter initial data which evolve to a big crunch singularity in a low energy supergravity limit of string theory.
D. Sudarsky, D.Z. Freedman, E. Witten, Gary T Horowitz, J.B. Hartle, J.M. Maldacena, J.M. Maldacena, L. Fidkowski, M. Dafermos, M. Gutperle, M. Henneaux, M. Henneaux, M. Heusler, M. Heusler, P. Breitenlohner, S.R. Coleman, S.S. Gubser, T. Hertog, T. Hertog, Thomas Hertog, V.E. Hubeny   +20 more
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Classical Theory of Singularities

SSRN Electronic Journal, 2023
The singularities from the general relativity resulting by solving Einstein's equations were and still are the subject of many scientific debates: Are there singularities in spacetime, or not? Big Bang was an initial singularity? If singularities exist, what is their ontology?
openaire   +2 more sources

Gravitational perfect fluid collapse in Gauss–Bonnet gravity

European Physical Journal C: Particles and Fields, 2017
The Einstein Gauss–Bonnet theory of gravity is the low-energy limit of heterotic super-symmetric string theory. This paper deals with gravitational collapse of a perfect fluid in Einstein–Gauss–Bonnet gravity by considering the Lemaitre–Tolman–Bondi ...
G. Abbas, M. Tahir
doaj   +1 more source

Hamiltonian dynamics and spectral theory for spin-oscillators [PDF]

, 2010
We study the Hamiltonian dynamics and spectral theory of spin-oscillators. Because of their rich structure, spin-oscillators display fairly general properties of integrable systems with two degrees of freedom.
H.J. Groenewold, J. Williamson, J.E. Moyal, J.J. Duistermaat, J.J. Duistermaat, L. Boutetde Monvel, L. Charles, M. Dimassi, M. Garay, M. Gross, M.F. Atiyah, N.C. Leung, N.T. Zung, R. Cushman, S. Vũ Ngoc, S. Vũ Ngoc, S. Vũ Ngoc, San Vũ Ngọc, T. Delzant, V. Bargmann, V. Guillemin, Á. Pelayo, Á. Pelayo, Á. Pelayo, Álvaro Pelayo   +24 more
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Solitons and black holes in non-Abelian Einstein-Born-Infeld theory [PDF]

, 2000
Recently it was shown that the Born-Infeld-type modification of the quadratic Yang-Mills action gives rise to classical particle-like solutions in the flat space which have a striking similarity with the Bartnik-McKinnon solutions known in the gravity ...
Bartnik, Bizon, Brecher, Breitenlohner, Breitenlohner, D.V. Gal'tsov, Donets, Gal'tsov, Gal'tsov, Gauntlett, Gibbons, Grandi, Kunzle, Park, V.V. Dyadichev, Volkov   +15 more
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Singular KAM Theory

, 2023
66 pages, 1 ...
Biasco, Luca, Chierchia, Luigi
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N=2 Heterotic Superstring and its Dual Theory in Five Dimensions [PDF]

, 1995
We study quantum effects in five dimensions in heterotic superstring theory compactified on K_3 x S_1 and analyze the conjecture that its dual effective theory is eleven-dimensional supergravity compactified on a Calabi-Yau threefold. This theory is also
Antoniadis, Antoniadis, Antoniadis, Aspinwall, Cadavid, Candelas, Cecotti, Ceresole, de Wit, de Wit, Dixon, Duff, Greene, Günaydin, Günaydin, Hosono, Howe, Hull, I. Antoniadis, Kachru, Kaplunovsky, Klemm, Papadopoulos, S. Ferrara, Strominger, Strominger, T.R. Taylor, Witten   +27 more
core   +2 more sources

Higher-Dimensional Geometry and Singularity Structure of Osculating Type-II Ruled Surfaces in Lorentzian Spaces

Mathematics
In Minkowski 3-space, we establish a geometric framework to osculate Type-II ruled surfaces by utilizing the Type-II Bishop frame in (E13). Our analysis extends to higher-order singularities such as butterflies and pyramids, including explicit ...
Mohammed Messaoudi, Marin Marin, Nidal E. Taha, Ghozail Sh. Al-Mutairi, Sayed Saber   +4 more
doaj   +1 more source

Bohmian Mechanics at Space-Time Singularities. I. Timelike Singularities

, 2018
We develop an extension of Bohmian mechanics to a curved background space-time containing a singularity. The present paper focuses on timelike singularities.
Tumulka, Roderich
core   +1 more source