27th International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY2019)

Session

Formal Field Theory and Strings

22 May 2019, 16:20

Nueces Ballroom A&B (Omni Hotel)

Conveners

Formal Field Theory and Strings

• Michele Cicoli (Università di Bologna)

Formal Field Theory and Strings

• Michael Ratz (UC Irvine)

241. Connected vacua of heterotic orbifolds

Kang Sin Choi (Ewha Womans University)

22/05/2019, 16:20

Formal Field Theory and Strings

Oral

We study the global structure of vacua of heterotic strings compactified on orbifolds T^4/Z_N in the presence of heterotic 5-branes. Gauge symmetry breaking associated with orbifold is described by instantons in the field theory. Phase transition between small instantons and heterotic 5-branes provides top-down, stringy account to the spectrum and modular invariance condition. Also it takes us...

35. Deep Autoencoders in the Heterotic Orbifold Landscape

Mr Andreas Mütter

22/05/2019, 16:45

Formal Field Theory and Strings

Oral

In orbifold compactifications of heterotic string theory, the four-dimensional effective theory (like the gauge group and the particle spectrum) is fully determined by the so-called gauge embedding. However, it is difficult to see directly whether a given gauge embedding leads to "good" phenomenological properties of the resulting model (such as containing the Standard Model spectrum). In this...

182. Moduli Stabilisation and Inflation in superstring theories

Prof. George Leontaris (University of Ioannina)

22/05/2019, 17:10

Formal Field Theory and Strings

Oral

The problem of moduli stabilisation and inflation are discussed in type IIB/F-theory. Considering a configuration of three intersecting D7 branes with fluxes, it is shown that higher loop effects induce logarithmic corrections to the K\"ahler potential which can stabilise the K\"ahler moduli. When a new Fayet-Iliopoulos term is included, it is also possible to generate the required number...

200. Numerical Moduli Stabilisation towards Calabi-Yau Data Exploration

Shehu AbdusSalam (Shahid Beheshti University)

22/05/2019, 17:40

Formal Field Theory and Strings

Oral

String compactifications with stabilised moduli and flat directions make it possible to
constrain the theory using phenomenological constraints or data. The base geometry
typically has many, analytically intractible, moduli fields and flux quanta that
characterise the kind of physics which could be explained. Numerical moduli stabilisation will facilitate the connection of Calabi-Yau data,...

21. High U(1) charge models in type IIB and their F-theory lift

Damian Kaloni Mayorga Peña (DCI, University of Guanajuato)

23/05/2019, 16:20

Formal Field Theory and Strings

Oral

In the quest of obtaining models with U(1) symmetries singlets with charges higher than 4 there is no systematic prescription from the point of view of F-theory. Following early work, where we worked out Sen's weak coupling limit for a family of F-theory standard models we now are able to systematically construct higher U(1) charge models in type IIB applying matrix factorization techniques,...

177. Low Energy Trends from Zeroth Order Properties of the Landscape

Kuver Sinha

23/05/2019, 16:45

Formal Field Theory and Strings

Oral

I will discuss certain long-standing features of the string landscape: the ubiquity of scalar and pseudoscalar fields, and the statistical bias towards a large SUSY breaking scale. In particular, scalars present the possibility of an early matter dominated era with important implications for dark matter, while the statistical draw towards large F-terms may be relevant for low-energy...

67. SUSY enhancement via T-branes and Hitchin systems

Dr Federico Carta (DESY)

23/05/2019, 17:10

Formal Field Theory and Strings

Oral

In the last couple of years it was discovered that some 4d N=1 quantum field theories flow in the IR to 4d N=2 superconformal field theories (often of generalized Argyres-Douglas type), therefore showing a phenomenon of Supersymmetry Enhancement at the IR fixed point. The N=2 IR theory is often non-lagrangian while the N=1 UV theory is lagrangian, therefore such flows are extremely useful to...

125. Testing the weak gravity conjecture in type I strings with broken supersymmetry

Mr Quentin Bonnefoy (Centre de Physique Théorique - École Polytechnique)

23/05/2019, 17:35

Formal Field Theory and Strings

Oral

I will discuss tests of the weak gravity conjecture in the presence of supersymmetry breaking, performed in the framework of type I string theory with supersymmetry broken by compactification (à la Scherk-Schwarz). Such a (perturbative string theory) setting allows for the presence of runaway potentials (here for the compactification radius), which is the only possibility if one accepts the...

86. Thraxions

Jakob Moritz (DESY)

23/05/2019, 18:00

Formal Field Theory and Strings

Oral

We argue that a new type of ultra light axion is generically present in the type IIB part of the string theory landscape. It arises when fluxes stabilize Calabi-Yau manifolds near a conifold transition locus in moduli space. After accounting for ten-dimensional backreaction the scalar potential features a finite axion monodromy with overall scale far smaller than the weak gravity conjecture...