scholarly journals On D-brane dynamics and moduli stabilization

2017 ◽  
Vol 32 (29) ◽  
pp. 1750150
Author(s):  
Noriaki Kitazawa
Keyword(s):  
String Theory ◽  
Fixed Points ◽  
Supersymmetry Breaking ◽  
Compact Space ◽  
Complex Structure ◽  
Simultaneous Presence ◽  
Moduli Stabilization ◽  
Type Iib String Theory ◽  
The Stability ◽  
Repulsive Forces

We discuss the effect of the dynamics of D-branes on moduli stabilization in type IIB string theory compactifications, with reference to a concrete toy model of [Formula: see text] orientifold compactification with fractional D3-branes and anti-D3-branes at orbifold fixed points. The resulting attractive forces between anti-D3-branes and D3-branes, together with the repulsive forces between anti-D3-branes and O3-planes, can affect the stability of the compact space. There are no complex structure moduli in [Formula: see text] orientifold, which should thus capture some generic features of more general settings where all complex structure moduli are stabilized by three-form fluxes. The simultaneous presence of branes and anti-branes brings along the breaking of supersymmetry. Non-BPS combinations of this type are typical of “brane supersymmetry breaking” and are a necessary ingredient in the KKLT scenario for stabilizing the remaining Kähler moduli. The conclusion of our analysis is that, while mutual D-brane interactions sometimes help Kähler moduli stabilization, this is not always the case.

scholarly journals ON ATTRACTOR FLOW AND SMALL BLACK HOLES

2011 ◽  
Vol 26 (13) ◽  
pp. 967-974 ◽  
Author(s):  
SANJAY SIWACH ◽  
BHUPENDRA NATH TIWARI
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
String Theory ◽  
Fixed Points ◽  
Entropy Function ◽  
Stability Conditions ◽  
Heterotic String Theory ◽  
The Stability ◽  
Horizon Geometry ◽  
Black Hole Solutions

We study the attractor flow and near horizon geometry of two-charge small black holes in heterotic string theory. The Hessian of Sen's entropy function with respect to the moduli fields has standard attractor properties and shows the interesting factorization at the attractor fixed points. We notice that the stability conditions are preserved under arbitrary α′-corrections to the black hole solutions.

scholarly journals Aspects of Moduli Stabilization in Type IIB String Theory

2016 ◽  
Vol 2016 ◽  
pp. 1-17
Author(s):  
Shaaban Khalil ◽  
Ahmad Moursy ◽  
Ali Nassar
Keyword(s):  
String Theory ◽  
Large Volume ◽  
Higgs Mass ◽  
Susy Breaking ◽  
Mass Limit ◽  
Gaugino Mass ◽  
Moduli Stabilization ◽  
Scalar Mass ◽  
Type Iib String Theory ◽  
Relic Abundance

We review moduli stabilization in type IIB string theory compactification with fluxes. We focus on KKLT and Large Volume Scenario (LVS). We show that the predicted soft SUSY breaking terms in KKLT model are not phenomenological viable. In LVS, the following result for scalar mass, gaugino mass, and trilinear term is obtained:m0=m1/2=-A0=m3/2, which may account for Higgs mass limit ifm3/2~O(1.5) TeV. However, in this case, the relic abundance of the lightest neutralino cannot be consistent with the measured limits. We also study the cosmological consequences of moduli stabilization in both models. In particular, the associated inflation models such as racetrack inflation and Kähler inflation are analyzed. Finally, the problem of moduli destabilization and the effect of string moduli backreaction on the inflation models are discussed.

scholarly journals Supersymmetry breaking due to moduli stabilization in string theory

2012 ◽  
Vol 85 (6) ◽  
Author(s):  
Andrei Linde ◽  
Yann Mambrini ◽  
Keith A. Olive
Keyword(s):  
String Theory ◽  
Supersymmetry Breaking ◽  
Moduli Stabilization

scholarly journals TARGET SPACE DUALITY AND MODULI STABILIZATION IN STRING GAS COSMOLOGY

2007 ◽  
Vol 22 (01) ◽  
pp. 165-179 ◽  
Author(s):  
AUTTAKIT CHATRABHUTI
Keyword(s):  
Fixed Point ◽  
Fixed Points ◽  
Moduli Space ◽  
Target Space ◽  
Moduli Stabilization ◽  
String Gas Cosmology ◽  
The Stability

Motivated by string gas cosmology, we investigate the stability of moduli fields coming from compactifications of string gas on torus with background flux. It was previously claimed that moduli are stabilized only at a single fixed-point in moduli space, a self-dual point of T-duality with vanishing flux. Here, we show that there exist other stable fixed-points on moduli space with nonvanishing flux. We also discuss the more general target space dualities associated with these fixed-points.

scholarly journals Non-supersymmetric AdS6 and the swampland

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Fabio Apruzzi ◽  
G. Bruno De Luca ◽  
Gabriele Lo Monaco ◽  
Christoph F. Uhlemann
Keyword(s):  
String Theory ◽  
Cosmological Constant ◽  
Mass Scale ◽  
Scale Separation ◽  
Decay Channels ◽  
Type Iib String Theory ◽  
The Stability

Abstract We discuss infinite families of non-supersymmetric AdS6 solutions in Type IIB string theory. They are siblings of supersymmetric solutions which are associated with (p, q) 5-brane webs and holographically dual to 5d SCFTs engineered by those brane webs. The non-supersymmetric backgrounds carry identical 5-brane charges and are connected to the supersymmetric ones by RG flows. We study the stability of the non-supersymmetric solutions, identifying perturbative and non-perturbative decay channels for all the backgrounds explicitly available. We also identify likely decay mechanisms for solutions that have not been constructed explicitly but may be expected to exist based on brane web considerations. Finally, we exclude scale separation by constructing universal spin 2 modes with masses comparable to the mass-scale of the cosmological constant.

scholarly journals An update on moduli stabilization with antibrane uplift

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Emilian Dudas ◽  
Severin Lüst
Keyword(s):  
Cosmological Constant ◽  
Supersymmetry Breaking ◽  
Light Field ◽  
Complex Structure ◽  
Small Scale ◽  
De Sitter ◽  
Moduli Stabilization ◽  
Matter Fields

Abstract It was recently shown that in warped compactifications based on a Klebanov-Strassler throat there is a light complex structure field, governing the size of the throat and the redshift at its tip. We show that after uplift of the cosmological constant by an anti-D3 brane at the tip of the throat, the contribution to supersymmetry breaking coming from the new light field is large. We work out the mass scales, in particular the condition for this field to be heavier than the Kähler modulus. We check that for the range of parameters relevant for the destabilization we find agreement with de Sitter swampland conjecture. Adding matter fields on distant branes, we discuss the effects on supersymmetry breaking in the observable sector. A hierarchically small scale of supersymmetry breaking translates generically into large values of localized D3 charges in the manifold.

scholarly journals MODELS OF PARTICLE PHYSICS FROM TYPE IIB STRING THEORY AND F-THEORY: A REVIEW

2013 ◽  
Vol 28 (05n06) ◽  
pp. 1330005 ◽  
Author(s):  
ANSHUMAN MAHARANA ◽  
ERAN PALTI
Keyword(s):  
String Theory ◽  
Particle Physics ◽  
Model Building ◽  
Realistic Model ◽  
Theory Model ◽  
Strongly Coupled ◽  
Moduli Stabilization ◽  
Physics Model ◽  
Type Iib String Theory ◽  
Review Model

We review particle physics model building in type IIB string theory and F-theory. This is a region in the landscape where in principle many of the key ingredients required for a realistic model of particle physics can be combined successfully. We begin by reviewing moduli stabilization within this framework and its implications for supersymmetry breaking. We then review model building tools and developments in the weakly coupled type IIB limit, for both local D3-branes at singularities and global models of intersecting D7-branes. Much of recent model building work has been in the strongly coupled regime of F-theory due to the presence of exceptional symmetries which allow for the construction of phenomenologically appealing Grand Unified Theories. We review both local and global F-theory model building starting from the fundamental concepts and tools regarding how the gauge group, matter sector and operators arise, and ranging to detailed phenomenological properties explored in the literature.

scholarly journals Higher form symmetries of Argyres-Douglas theories

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Michele Del Zotto ◽  
Iñaki García Etxebarria ◽  
Saghar S. Hosseini
Keyword(s):  
Gauge Theory ◽  
String Theory ◽  
Fixed Points ◽  
Large Class ◽  
Careful Analysis ◽  
Consistency Check ◽  
Compact Field ◽  
Hypersurface Singularities ◽  
Type Iib String Theory

Abstract We determine the structure of 1-form symmetries for all 4d $$ \mathcal{N} $$ N = 2 theories that have a geometric engineering in terms of type IIB string theory on isolated hypersurface singularities. This is a large class of models, that includes Argyres-Douglas theories and many others. Despite the lack of known gauge theory descriptions for most such theories, we find that the spectrum of 1-form symmetries can be obtained via a careful analysis of the non-commutative behaviour of RR fluxes at infinity in the IIB setup. The final result admits a very compact field theoretical reformulation in terms of the BPS quiver. We illustrate our methods in detail in the case of the ($$ \mathfrak{g},{\mathfrak{g}}^{\prime } $$ g , g ′ ) Argyres-Douglas theories found by Cecotti-Neitzke-Vafa. In those cases where $$ \mathcal{N} $$ N = 1 gauge theory descriptions have been proposed for theories within this class, we find agreement between the 1-form symmetries of such $$ \mathcal{N} $$ N = 1 Lagrangian flows and those of the actual Argyres-Douglas fixed points, thus giving a consistency check for these proposals.

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