Solar System and Atomic Clock Bounds on Locally Coupled Swampland Scalars

Abstract

We study how local measurements constrain light scalar fields that are relevant in late time cosmic acceleration and are often discussed in connection with swampland criteria. Starting from a scalar-tensor framework, we define the swampland slope and curvature variables in the canonically normalized Einstein frame and relate them to Solar System tracking, Lunar Laser Ranging, equivalence principle tests and atomic clock comparisons. These measurements do not constrain the scalar velocity by itself, but products of that velocity with microscopic couplings to matter, gravity and atomic parameters. For coupling directions visible to local experiments, the scalar is driven into an ultra slow present regime. This severely restricts the possibility of realizing an $\mathcal{O}(1)$ de Sitter gradient through unscreened visible sector couplings alone. The refined de Sitter alternative remains possible, but in the single field hilltop realization it requires proximity to the maximum or a tuned suppression of the growing mode.

arXiv comment18 pages with 1 figure, comments welcome

References in corpus (52)

• Modified Gravity and Cosmology
• The Confrontation between General Relativity and Experiment
• Cosmological Imprint of an Energy Component with General Equation of State
• A Dynamical Solution to the Problem of a Small Cosmological Constant and Late-time Cosmic Acceleration
• Essentials of k-essence
• Coupled Quintessence
• Chameleon Fields: Awaiting Surprises for Tests of Gravity in Space
• The String Dilaton and a Least Coupling Principle
• On the Geometry of the String Landscape and the Swampland
• Beyond the Cosmological Standard Model
• The Swampland: Introduction and Review
• The Pre-Big Bang Scenario in String Cosmology
• Distance and de Sitter Conjectures on the Swampland
• Varying constants, Gravitation and Cosmology
• Progress in Lunar Laser Ranging Tests of Relativistic Gravity
• Imperfect Dark Energy from Kinetic Gravity Braiding
• On the Cosmological Implications of the String Swampland
• Frequency ratio of two optical clock transitions in ${}^{171}$Yb${}^{+}$ and constraints on the time-variation of fundamental constants
• Torsion-balance tests of the weak equivalence principle
• Bounds on Slow Roll and the de Sitter Swampland
• Searching for dilaton dark matter with atomic clocks
• What if string theory has no de Sitter vacua?
• A Search for Variations of Fundamental Constants using Atomic Fountain Clocks
• Equivalence Principle Violations and Couplings of a Light Dilaton
• Precision Metrology Meets Cosmology: Improved Constraints on Ultralight Dark Matter from Atom-Cavity Frequency Comparisons
• MICROSCOPE mission: final results of the test of the Equivalence Principle
• On the de Sitter swampland criterion
• The Weak Gravity Conjecture and Emergence from an Ultraviolet Cutoff
• Improved limits on the coupling of ultralight bosonic dark matter to photons from optical atomic clock comparisons
• Further refining the de Sitter swampland conjecture
• Phenomenology of the Equivalence Principle with Light Scalars
• The asymptotic dS Swampland Conjecture - a simplified derivation and a potential loophole
• Lunar Laser Ranging Science: Gravitational Physics and Lunar Interior and Geodesy
• Swampland Conjectures and Late-Time Cosmology
• Measuring the stability of fundamental constants with a network of clocks
• Lunar laser ranging in infrfared at hte Grasse laser station
• Variation of fundamental constants: theory and observations
• D-BIonic Screening of Scalar Fields
• Constraints on Horndeski Theory Using the Observations of Nordtvedt Effect, Shapiro Time Delay and Binary Pulsars
• Constraining a possible variation of G with Type Ia supernovae
• Screened Scalar Fields in the Laboratory and the Solar System
• Searching for a Fifth Force with Atomic and Nuclear Clocks
• Constraining the cosmological evolution of scalar-tensor theories with local measurements of the time variation of G
• Properties of scalar wave emission in a scalar-tensor theory with kinetic screening
• Competing bounds on the present-day time variation of fundamental constants
• Dynamical Analysis of Screening in Scalar-Tensor Theory
• Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field
• Constraints on the Variation of Physical Constants, Equivalence Principle Violation, and a Fifth Force from Atomic Experiments
• Constraining the attractive fifth force in the general free scalar-tensor gravity with solar system experiments
• Testing screened scalar-tensor theories of gravity with atomic clocks
• Swampland conjectures and single field inflation in non-standard cosmological scenarios
• PPN meets EFT of dark energy: Post-Newtonian approximation in higher-order scalar-tensor theories