Deconstructing the String Landscape (a.k.a. landscapia)

Session

:

29 nov. 2023, 11:00

Amphitheater Claude Bloch (IPhT, CEA/Saclay, France)

Présidents de session

:: De Sitter vacua at leading order

• Jakob Moritz

:: Exploring the Interior of N=1 Field Spaces

• Max Wiesner

:: (De)Constructing Scale Separation with Weak Gravity and Anisotropies

• Niccolò Cribiori

:: Tadpole and Moduli in Type IIB on the 1^9 Landau-Ginzburg Model

• Nathan Brady
• Anindya Sengupta

:: HS Symmetry at Infinite Distances and its Stringy Origin

• José Calderón-Infante

:: Machine-learning Calabi-Yau metrics

• Magdalena Larfors

:: A dS from higher dimensions

• G. Bruno De Luca

:: Transient de Sitter vacua via interacting Dark Sectors

• Susha Parameswaran

:: String universality and mixed anomalies

• Markus Dierigl

:: Supersymmetric string vacua with flat backgrounds

• Peng Cheng

:: On the Exotic String Landscape

• Houri Christina Tarazi

:: Non-supersymmetric strings and rank reduction

• Héctor Parra De Freitas

:: Deconstructing heterotic flux vacua

• Dan Israel

:: Charting the landscape of non-supersymmetric strings

• Salvatore Raucci

5. De Sitter vacua at leading order

Jakob Moritz

29/11/2023 11:00

In this talk I will present the first explicit examples of de Sitter vacua as envisioned by Kachru, Kallosh, Linde and Trivedi 20 years ago, in the tree level approximation in both the string loop and $\alpha’$ expansion. I will begin by summarizing the construction of all the relevant components, from Calabi-Yau orientifolds, and a mechanism to generate exponentially small superpotentials...

2. Exploring the Interior of N=1 Field Spaces

Max Wiesner

29/11/2023 14:15

To study realistic vacua of string theory with minimal or no supersymmetry it is crucial to have a good understanding of the field space of such theories away from asymptotic boundaries where all supersymmetry breaking effects are diluted. In this talk I will focus on four-dimensional theories arising from F-theory compactifications on elliptically-fibered Calabi-Yau fourfolds X4: T2 —> B3. In...

7. (De)Constructing Scale Separation with Weak Gravity and Anisotropies

Niccolò Cribiori

29/11/2023 14:45

The existence of a separation of scales between the four observed spacetime dimensions and the unobserved additional ones is a minimal requirement for string phenomenology and an open problem therein. In the first part of the talk, I will present a general argument excluding scale separation in anti-de Sitter vacua of gauged supergravity with at least eight supercharges, as a consequence of...

8. Tadpole and Moduli in Type IIB on the 1^9 Landau-Ginzburg Model

Nathan Brady, Anindya Sengupta

29/11/2023 15:15

We report recent progress made on flux backgrounds of type IIB string theory on 4D Minkowski times a non-geometric internal manifold characterized by its worldsheet description in terms of the 1^9 Landau-Ginzburg model. We present a classification of solutions, the minimum flux tadpole attained by each class, and the number of massive complex structure moduli for the minimum-tadpole...

9. HS Symmetry at Infinite Distances and its Stringy Origin

José Calderón-Infante

29/11/2023 16:15

In the first part of this talk, I will sketch a proof for the first part of the CFT Distance Conjecture, which states that higher-spin symmetry must always lie at infinite distance in the conformal manifold of any local CFT in more than two dimensions. In the second part, I will address the stringy origin of these HS symmetries. Among other things, I will discuss a remarkable connection...

12. Machine-learning Calabi-Yau metrics

Magdalena Larfors

30/11/2023 11:00

Calabi Yau (CY) manifolds are used ubiquitously in research on string theory. Since decades, these spaces have provided the main avenue to connect string theory with observable physics. A stumbling block in these constructions is the lack of an analytical expression for the CY metrics. In this talk I will review recent work on obtaining numerical approximations of CY metrics using machine...

15. A dS from higher dimensions

G. Bruno De Luca

30/11/2023 15:15

Constructing realistic vacua in UV-complete theories of gravity remains a challenging open problem.
In the context of gravity compactifications, quantum effects provide mechanisms to stabilize internal spaces with zero or negative curvature, thereby enlarging the set of geometries that can be employed to construct realistic physical models.
Specifically, I will describe how the inclusion of...

16. Transient de Sitter vacua via interacting Dark Sectors

Susha Parameswaran

30/11/2023 16:15

I will discuss how interacting Dark Sectors can give rise to transient de Sitter vacua, starting from hilltop or runaway potentials, which are consistent with cosmological observations and the Swampland Conjectures.

19. String universality and mixed anomalies

Markus Dierigl

01/12/2023 11:00

In this talk I will summarize recent advances in string universality utilizing the absence of certain mixed anomalies. These anomalies in general contain contributions from the higher-from symmetries of the theory and impose severe consistency conditions on the gauge sectors, in particular the global form of the gauge group. Interestingly, many of these low-energy conditions allow for...

20. Supersymmetric string vacua with flat backgrounds

Peng Cheng

01/12/2023 12:00

In this talk, we will focus on some examples to discuss the effects of flat backgrounds on supersymmetric string vacua with both 16 and 8 supercharges.

22. On the Exotic String Landscape

Houri Christina Tarazi

01/12/2023 14:30

Non geometric string constructions can give us a window into interesting corners of the quantum gravity landscape and enlarge the boundaries of our current understanding. I will firstly be discussing such constructions in 8 supercharges where the usual prominent compactifications arise from Calabi-Yau threefolds. Such compactifications always come with a dilation field controlling the volume...

23. Non-supersymmetric strings and rank reduction

Héctor Parra De Freitas

01/12/2023 15:00

The landscape of string vacua with 16 supercharges consists of various disconnected components which are nevertheless interrelated through maps taking on very different forms depending on the duality frame employed. These include asymmetric orbifolds on both the heterotic and type II sides, and frozen singularities in the F-theory and M-theory pictures. In this talk I will consider the...

24. Deconstructing heterotic flux vacua

Dan Israel

01/12/2023 15:30

We investigate the interrelation between topology and Narain T-duality of heterotic flux vacua. We present evidence that all 5 and 4-dimensional Minkowski space heterotic flux backgrounds with 8 supercharges have a locus in the moduli space with a T-dual description in terms of a compactification on the product of a K3 surface with a circle or a torus. We examine the implications of these...

25. Charting the landscape of non-supersymmetric strings

Salvatore Raucci

01/12/2023 16:30

The landscape of non-supersymmetric string theories remains largely uncharted. Standard techniques from flux compactifications are lost, forcing us to fall back on the full string equations of motion. Despite this, non-supersymmetric strings are the simplest arena in which we can capture the effects of the absence of supersymmetry from complete UV descriptions. In this talk, I will discuss...