Results 111 to 120 of about 53,013 (301)
Progress of Theoretical and Experimental Physics, 2015 The shape of D-branes is of fundamental interest in string theory. We find that generically D-branes in trivial spacetime can form a conic shape under external uniform forces. Surprisingly, the apex angle is found to be unique, once the spatial dimensions of the cone is given. In particular it is universal irrespective of the external forces.
Hashimoto, Koji +2 more
openaire +2 more sources
D-Branes, Derived Categories, and Grothendieck Groups
, 1999 In this paper we describe how Grothendieck groups of coherent sheaves and locally free sheaves can be used to describe type II D-branes, in the case that all D-branes are wrapped on complex varieties and all connections are holomorphic.
Aharony +13 more
core +2 more sources
On the shape of a D-brane bound state and its topology change [PDF]
, 2009 As is well known, coordinates of D-branes are described by NxN matrices. From generic non-commuting matrices, it is difficult to extract physics, for example, the shape of the distribution of positions of D-branes. To overcome this problem, we generalize
+35 more
core +3 more sources
Optimal model‐based design of experiments for parameter precision: Supercritical extraction case
The Canadian Journal of Chemical Engineering, EarlyView.Abstract This study investigates the process of chamomile oil extraction from flowers. A parameter‐distributed model consisting of a set of partial differential equations is used to describe the governing mass transfer phenomena in a cylindrical packed bed with solid chamomile particles under supercritical conditions using carbon dioxide as a solvent ...
Oliwer Sliczniuk, Pekka Oinas
wiley +1 more source
Non-supersymmetric D-branes with vanishing cylinder amplitudes in asymmetric orbifolds
Journal of High Energy Physics, 2017 We study the type II string vacua with chiral space-time SUSY constructed as asymmetric orbifolds of torus and K3 compactifications. Despite the fact that all the D-branes are non-BPS in any chiral SUSY vacua, we show that the relevant non-geometric ...
Yuji Satoh +2 more
doaj +1 more source
Gauge fields and D-branes [PDF]
Journal of Geometry and Physics, 1998 We prove that self-dual gauge fields in type I superstring theory are equivalent to configurations of Dirichlet 5-branes, by showing that the world-sheet theory of a Dirichlet 1-brane moving in a background of 5-branes includes an ``ADHM sigma model.'' This provides an explicit construction of the equivalent self-dual gauge field.
openaire +3 more sources
Geometry of N=1 Dualities in Four Dimensions [PDF]
, 1997 We discuss how N=1 dualities in four dimensions are geometrically realized by wrapping D-branes about 3-cycles of Calabi-Yau threefolds. In this setup the N=1 dualities for SU, SO and USp gauge groups with fundamental fields get mapped to statements ...
Bershadsky +14 more
core +4 more sources
Food Chemistry International, EarlyView.This study evaluated Bambara groundnut–wheat composite bread fortified with orange peel in diabetic rats. Diets significantly lowered blood glucose, inhibited α‐glucosidase and α‐amylase, and boosted antioxidant enzymes compared to controls. Results emphasize BG‐based functional foods' potential to help manage type 2 diabetes through regulation of ...
S. O. Oguntuase +3 more
wiley +1 more source
Non-Abelian black holes in string theory
Journal of High Energy Physics, 2017 We study a family of 5-dimensional non-Abelian black holes that can be obtained by adding an instanton field to the well-known D1D5W Abelian black holes. Naively, the non-Abelian fields seem to contribute to the black-hole entropy but not to the mass due
Pablo A. Cano +3 more
doaj +1 more source
Journal of High Energy Physics, 2020 According to the KKLT scenario, metastable dS vacua are formed as a result of uplifting of supersymmetric AdS vacua by D 3 ¯ $$ \overline{D3} $$ branes.
Andrei Linde
doaj +1 more source