Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Parameswaran, Susha"'
Autor:
Parameswaran, Susha, Serra, Marco
We investigate the existence of dS vacua in supersymmetry-breaking Scherk-Schwarz toroidal compactifications of type II string theory, using the well-understood ingredients of curvature, fluxes and 1-loop Casimir energy. Starting from the 10d equatio
Externí odkaz:
http://arxiv.org/abs/2407.16781
Autor:
Bhattacharya, Sukannya, Borghetto, Giulia, Malhotra, Ameek, Parameswaran, Susha, Tasinato, Gianmassimo, Zavala, Ivonne
Dynamical dark energy has gained renewed interest due to recent theoretical and observational developments. In the present paper, we focus on a string-motivated dark energy set-up, and perform a detailed cosmological analysis of exponential quintesse
Externí odkaz:
http://arxiv.org/abs/2405.17396
We explore the possibility that our universe's current accelerated expansion is explained by a quintessence model with an exponential scalar potential, $V =V_0\, e^{-\lambda\, \phi}$, keeping an eye towards $\lambda \geq \sqrt{2}$ and an open univers
Externí odkaz:
http://arxiv.org/abs/2405.09323
Publikováno v:
Phys.Rev.D 110 (2024) 2, 023533
We analyse theories that do not have a de Sitter vacuum and cannot lead to slow-roll quintessence, but which nevertheless support a transient era of accelerated cosmological expansion due to interactions between a scalar $\phi$ and either a hidden se
Externí odkaz:
http://arxiv.org/abs/2311.08888
We consider various string-loop, warping and curvature corrections that are expected to appear in type IIB moduli stabilisation scenarios. It has recently been argued, in the context of strongly-warped LVS de Sitter vacua, that it is impossible to ac
Externí odkaz:
http://arxiv.org/abs/2306.07332
Autor:
Cicoli, Michele, Conlon, Joseph P., Maharana, Anshuman, Parameswaran, Susha, Quevedo, Fernando, Zavala, Ivonne
We review applications of string theory to cosmology, from primordial times to the present-day accelerated expansion. Starting with a brief overview of cosmology and string compactifications, we discuss in detail moduli stabilisation, inflation in st
Externí odkaz:
http://arxiv.org/abs/2303.04819
This note is intended to serve as a reference for conventions used in the literature on string compactifications, and how to move between them, collected in a single and easy-to-find place, using type IIB as an illustrative example. We hope it may be
Externí odkaz:
http://arxiv.org/abs/2301.05178
We study the gravitational signatures that arise from compactifying Type IIB supergravity on a compact space containing a Klebanov-Strassler warped throat. After reviewing the dimensional reduction of the 10d graviton and explicitly obtaining the equ
Externí odkaz:
http://arxiv.org/abs/2204.02086
In this article we show that finite perturbative corrections in non-supersymmetric strings can be understood via an interplay between modular invariance and misaligned supersymmetry. While modular invariance is known to be crucial in closed-string mo
Externí odkaz:
http://arxiv.org/abs/2110.11973
We revisit moduli stabilisation for type IIB flux compactifications that include a warped throat region corresponding to a warped deformed conifold, with an anti-D3-brane sitting at its tip. The warping induces a coupling between the conifold's defor
Externí odkaz:
http://arxiv.org/abs/2105.03370