scholarly journals Logarithmic loop corrections, moduli stabilisation and de Sitter vacua in string theory

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Ignatios Antoniadis ◽  
Yifan Chen ◽  
George K. Leontaris
Keyword(s):  
String Theory ◽  
De Sitter ◽  
De Sitter Vacua

scholarly journals Unimodular vs nilpotent superfield approach to pure dS supergravity

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Sukruti Bansal ◽  
Silvia Nagy ◽  
Antonio Padilla ◽  
Ivonne Zavala
Keyword(s):  
String Theory ◽  
General Framework ◽  
Recent Progress ◽  
High Energy ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
New Approach ◽  
Sitter Spacetime ◽  
Novel Approach ◽  
De Sitter Vacua

Abstract Recent progress in understanding de Sitter spacetime in supergravity and string theory has led to the development of a four dimensional supergravity with spontaneously broken supersymmetry allowing for de Sitter vacua, also called de Sitter supergravity. One approach makes use of constrained (nilpotent) superfields, while an alternative one couples supergravity to a locally supersymmetric generalization of the Volkov-Akulov goldstino action. These two approaches have been shown to give rise to the same 4D action. A novel approach to de Sitter vacua in supergravity involves the generalisation of unimodular gravity to supergravity using a super-Stückelberg mechanism. In this paper, we make a connection between this new approach and the previous two which are in the context of nilpotent superfields and the goldstino brane. We show that upon appropriate field redefinitions, the 4D actions match up to the cubic order in the fields. This points at the possible existence of a more general framework to obtain de Sitter spacetimes from high-energy theories.

scholarly journals Gauge R-symmetry and de Sitter vacua in supergravity and string theory

2014 ◽  
Vol 886 ◽  
pp. 43-62 ◽  
Author(s):  
Ignatios Antoniadis ◽  
Rob Knoops
Keyword(s):  
String Theory ◽  
De Sitter ◽  
De Sitter Vacua ◽  
R Symmetry

scholarly journals Supersymmetry breaking branes on solvmanifolds and de Sitter vacua in string theory

2011 ◽  
Vol 2011 (5) ◽  
Author(s):  
David Andriot ◽  
Enrico Goi ◽  
Ruben Minasian ◽  
Michela Petrini
Keyword(s):  
String Theory ◽  
Supersymmetry Breaking ◽  
De Sitter ◽  
De Sitter Vacua

scholarly journals New class of de Sitter vacua in string theory compactifications

2016 ◽  
Vol 94 (8) ◽  
Author(s):  
Ana Achúcarro ◽  
Pablo Ortiz ◽  
Kepa Sousa
Keyword(s):  
String Theory ◽  
De Sitter ◽  
New Class ◽  
De Sitter Vacua

scholarly journals Nonperturbative de Sitter vacua via α′ corrections

2019 ◽  
Vol 28 (14) ◽  
pp. 1943002 ◽  
Author(s):  
Olaf Hohm ◽  
Barton Zwiebach
Keyword(s):  
String Theory ◽  
Time Dependent ◽  
De Sitter ◽  
Higher Derivative ◽  
Derivative Formula ◽  
De Sitter Vacua

The higher-derivative [Formula: see text] corrections consistent with [Formula: see text] duality invariance can be completely classified for cosmological, purely time-dependent backgrounds. This result is used to show that there are duality invariant theories featuring string-frame de Sitter vacua as solutions that are nonperturbative in [Formula: see text], thus suggesting that classical string theory may realize de Sitter solutions in an unexpected fashion.

scholarly journals Crisis on infinite earths: short-lived de Sitter vacua in the string theory landscape

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Heliudson Bernardo ◽  
Suddhasattwa Brahma ◽  
Keshav Dasgupta ◽  
Radu Tatar
Keyword(s):  
String Theory ◽  
Decay Time ◽  
Degrees Of Freedom ◽  
De Sitter ◽  
New Class ◽  
De Sitter Vacua

Abstract We construct purely non-perturbative anti-de Sitter vacua in string theory which, on uplifting to a de Sitter (dS) one, have a decay time many orders of magnitude smaller than those of standard constructions, such as the KKLT and LVS scenarios. By virtue of being constructed purely from non-perturbative terms, these vacua avoids certain obstructions plaguing other constructions of dS in string theory. This results in a new class of phenomenological dS vacua in string theory with novel distinctive characteristics such as having two maxima. After examining whether these uplifted dS vacua obey the TCC, we revisit some old problems of realization of dS space as a vacuum. We find that not only is it phenomenologically hard to construct TCC-compatible vacua, but also inherent temporal dependences of the degrees of freedom generically arise in such constructions, amongst other issues. This reinforces the idea that dS, if it exists in string theory, should be a Glauber-Sudarshan state and not a vacuum.

scholarly journals Oh, wait, O8 de Sitter may be unstable!

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Iosif Bena ◽  
G. Bruno De Luca ◽  
Mariana Graña ◽  
Gabriele Lo Monaco
Keyword(s):  
String Theory ◽  
De Sitter ◽  
De Sitter Vacua ◽  
The Stability

Abstract We analyze the stability of four-dimensional de Sitter vacua constructed by compactifying massive Type IIA supergravity in the presence of two O8 sources [1]. When embedded in String Theory the first source has a clear interpretation as an O8− plane, but the second one could correspond to either an O8+ plane or to an O8− plane with 16 D8-branes on top. We find that this latter solution has a tachyonic instability, corresponding to the D8 branes moving away from the O8− plane. We comment on the possible ways of distinguishing between these sources.

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