Results 131 to 140 of about 16,257,561 (327)

Neutrino mass textures from F-theory

, 2013
Experimental data on the neutrino mixing and masses strongly suggest an underlying approximate symmetry of the relevant Yukawa superpotential terms. Intensive phenomenological explorations during the last decade indicate that permutation symmetries such ...
Antoniadis, I., Leontaris, G. K.
core   +1 more source

F-theory compactifications for supersymmetric GUTs [PDF]

Journal of High Energy Physics, 2009
We construct a family of elliptically fibered Calabi-Yau four-folds Y_4 for F-theory compactifications that realize SU(5) GUTs in the low-energy limit. The three-fold base X_3 of these fibrations is almost Fano and satisfies the topological criteria required to ensure that the U(1)_Y gauge boson remains massless, while allowing a decoupling of GUT and ...
Marsano, J, Saulina, N, Schafer-Nameki, S   +2 more
openaire   +4 more sources

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

Non-Abelian discrete gauge symmetries in F-theory [PDF]

, 2015
A bstractThe presence of non-Abelian discrete gauge symmetries in four-dimensional F-theory compactifications is investigated. Such symmetries are shown to arise from seven-brane configurations in genuine F-theory settings without a weak string coupling ...
Thomas W. Grimm, T. G. Pugh, D. Regalado
semanticscholar   +1 more source

Fluxed M5-instantons in F-theory

, 2012
We analyse the non-perturbative superpotential due to M5-brane instantons in F-theory compactifications on Calabi-Yau fourfolds. The M5 partition function is obtained via holomorphic factorisation by explicitly performing the sum over chiral 3-form ...
Akerblom, Akerblom, Andreas, Argurio, Argurio, Bandos, Baumann, Baumann, Berg, Bergshoeff, Bergshoeff, Bershadsky, Bianchi, Bianchi, Bianchi, Billo, Billo, Blumenhagen, Blumenhagen, Blumenhagen, Blumenhagen, Blumenhagen, Blumenhagen, Blumenhagen, Braun, Chen, Collinucci, Collinucci, Collinucci, Cvetič, Cvetič, Cvetič, DallʼAgata, Dijkgraaf, Dolan, Donagi, Donagi, Esole, Florea, Freed, Greene, Grimm, Grimm, Grimm, Grimm, Grimm, Grimm, Grimm, Grimm, Grimm, Grimm, Grimm, Gustavsson, Gustavsson, Haack, Haack, Haack, Henningson, Howe, Ibanez, Ibanez, Intriligator, Jockers, Kachru, Kallosh, Kallosh, Kerstan, Knapp, Koerber, Krause, Krause, Marchesano, Marsano, Marsano, Marsano, Marsano, Marsano, Martucci, Max Kerstan, Mayr, Pasti, Pasti, Saulina, Timo Weigand, Tsimpis, Witten, Witten   +86 more
core   +1 more source

Non-perturbative selection rules in F-theory [PDF]

, 2015
We discuss the structure of charged matter couplings in 4-dimensional F-theory compactifications. Charged matter is known to arise from M2-branes wrapping fibral curves on an elliptic or genus-one fibration Y.
Martucci, Luca, Weigand, Timo
core   +2 more sources

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Electromagnetic Near-Field Inhomogeneity Reduction for Image Acquisition Optimization in High-Resolution Multi-Channel Magnetic Resonance Imaging (MRI) Systems

IEEE Access, 2017
This paper is a study of the inhomogeneity reduction for near-field acquisition in high-resolution magnetic resonance imaging (MRI) systems. The acquisition homogeneity in MRI imaging modality is an open issue concerning the optimal MRI image generation ...
Pablo Padilla, Juan F. VAlenzuela-Valdes, Jose L. Padilla, Francisco Luna-Valero   +3 more
doaj   +1 more source

Valosin‐containing protein counteracts ATP‐driven dissolution of FUS condensates through its ATPase activity in vitro

FEBS Letters, EarlyView.
Biomolecular condensates formed by fused in sarcoma (FUS) are dissolved by high ATP concentrations yet persist in cells. Using a reconstituted system, we demonstrate that valosin‐containing protein (VCP), an AAA+ ATPase, counteracts ATP‐driven dissolution of FUS condensates through its D2 ATPase activity.
Hitomi Kimura, Shin‐ichi Tate, Kyota Yasuda   +2 more
wiley   +1 more source

Particle Physics Implications of F-theory

, 2010
We review recent progress in realizing Grand Unified Theories (GUTs) in a strongly coupled formulation of type IIB string theory known as F-theory. Our main emphasis is on the expected low-energy phenomenology of a minimal class of F-theory GUTs.
Heckman, Jonathan J.
core   +1 more source