Results 41 to 50 of about 1,021 (98)

Towards a warped inflationary brane scanning

, 2009
We present a detailed systematics for comparing warped brane inflation with the observations, incorporating the effects of both moduli stabilization and ultraviolet bulk physics.
C. P. Burgess, Heng-Yu Chen, J. O. Gong, Jinn-Ouk Gong   +3 more
core   +1 more source

The versal deformation of small resolutions of conic bundles over P1×P1${\mathbb {P}}^1\times {\mathbb {P}}^1$ with two sections blown down

Journal of the London Mathematical Society, Volume 113, Issue 2, February 2026.
Abstract Twistor spaces are certain compact complex three‐folds with an additional real fibre bundle structure. We focus here on twistor spaces over P2#P2#P2${\mathbb {P}}^2\#{\mathbb {P}}^2\#{\mathbb {P}}^2$. Such spaces are either small resolutions of double solids or they can be described as modifications of conic bundles.
Bernd Kreußler, Jan Stevens
wiley   +1 more source

The algebra of parallel endomorphisms of a germ of pseudo-Riemannian metric

, 2015
On a (pseudo-)Riemannian manifold (M,g), some fields of endomorphisms i.e. sections of End(TM) may be parallel for g. They form an associative algebra A, which is also the commutant of the holonomy group of g.
Boubel, Charles
core   +3 more sources

The cosymplectic Chern–Hamilton conjecture

Journal of the London Mathematical Society, Volume 113, Issue 2, February 2026.
Abstract In this paper, we study the Chern–Hamilton energy functional on compact cosymplectic manifolds, fully classifying in dimension 3 those manifolds admitting a critical compatible metric for this functional. This is the case if and only if either the manifold is co‐Kähler or if it is a mapping torus of the 2‐torus by a hyperbolic toral ...
Søren Dyhr, Ángel González‐Prieto, Eva Miranda, Daniel Peralta‐Salas   +3 more
wiley   +1 more source

Split NMSSM from dimensional reduction of a 10D, N $$ \mathcal{N} $$ = 1 E 8 over SU(3)/U(1) × U(1) × Z 3

Journal of High Energy Physics
We examine an extension of the Standard Model which results from a 10D, N $$ \mathcal{N} $$ = 1, E 8 gauge theory. The theory is dimensionally reduced over a M 4 × B 0 / Z 3 space, where B 0 is the nearly-Kähler manifold SU(3)/U(1) × U(1) and Z 3 is a ...
Gregory Patellis, Werner Porod, George Zoupanos   +2 more
doaj   +1 more source

FTheoryTools: Advancing Computational Capabilities for F‐Theory Research

Fortschritte der Physik, Volume 74, Issue 1, January 2026.
Abstract A primary goal of string phenomenology is to identify realistic four‐dimensional physics within the landscape of string theory solutions. In F‐theory, such solutions are encoded in the geometry of singular elliptic fibrations, whose study often requires particularly challenging and cumbersome computations.
Martin Bies, Miķelis E. Miķelsons, Andrew P. Turner   +2 more
wiley   +1 more source

Simulations of Radiological Dose Quantities in Astronauts During Solar Energetic Particle Events Across Modern Space History

Space Weather, Volume 24, Issue 1, January 2026.
Abstract Solar Particle Events (SPEs) represent one of the most significant hazards to future crewed space missions. Accurate assessment of radiation doses received by astronauts during these events is essential for determining the shielding requirements in spacecraft and off‐planet shelter design.
Sylvain Blunier, Piers Jiggens, Juan A. Valdivia, Aidan Cowley   +3 more
wiley   +1 more source

On Quasistatistical F‐Connections on the Anti‐Kähler Manifolds

Journal of Mathematics, Volume 2026, Issue 1, 2026.
The paper focuses on investigating a specific type of quasistatistical F‐connections within the context of an anti‐Kähler manifold. Initially, the paper establishes a connection between the Riemannian connection and the specialized quasistatistical F‐connection.
Cagri Karaman, Aydin Gezer, Mohammad Nazrul Islam Khan, Zuhre Topuz, Pramita Mishra   +4 more
wiley   +1 more source

Novel Theorems on Spacetime Admitting Pseudo‐W2 Curvature Tensor

Journal of Mathematics, Volume 2026, Issue 1, 2026.
This paper investigates spacetime manifolds admitting a pseudo‐W2 curvature tensor. We show that a pseudo‐W2 flat spacetime is an Einstein manifold and therefore has constant curvature. Moreover, when the manifold satisfies the Einstein field equations (EFE), with a cosmological constant, the associated energy–momentum tensor is covariantly constant ...
B. B. Chaturvedi, Prabhawati Bhagat, Mohammad Nazrul Islam Khan, Ljubisa Kocinac   +3 more
wiley   +1 more source

Study of η‐Ricci–Yamabe Solitons and Ricci–Yamabe Solitonss in a Lorentzian Nearly Kähler Space‐Time Manifold

Journal of Mathematics, Volume 2026, Issue 1, 2026.
An η‐Ricci–Yamabe solitonss is a notion of both Ricci and Yamabe solitons, defined by a geometric equation involving a tensor field, which has applications in general relativity and cosmology. The objective of the present research is to examine η‐Ricci–Yamabe solitonss and Ricci–Yamabe solitonss on covariant projectively flat and concircularly flat ...
B. B. Chaturvedi, Neha Chauhan, Mohammad Nazrul Islam Khan, Smritijit Sen   +3 more
wiley   +1 more source