Swampland Bounds on Dark Sectors

Abstract

We use Swampland principles to theoretically disfavor regions of the parameter space of dark matter and other darkly charged particles that may exist. The Festina Lente bound, the analogue of the Weak-Gravity conjecture in de Sitter, places constraints on the mass and charge of dark particles, which here we show cover regions in parameter space that are currently allowed by observations. As a consequence, a broad set of new ultra-light particles are in the Swampland, independently of their cosmic abundance, showing the complementarity of Quantum Gravity limits with laboratory and astrophysical studies. In parallel, a Swampland bound on the UV cutoff associated to the axion giving a Stückelberg photon its longitudinal mode translates to a new constraint on the kinetic mixings and masses of dark photons. This covers part of the parameter space targeted by upcoming dark-photon direct-detection experiments. Moreover, it puts astrophysically interesting models in the Swampland, including freeze-in dark matter through an ultra-light dark photon, as well as radio models invoked to explain the 21-cm EDGES anomaly.

31 pages, 5 figures

References in corpus (33)

• Ultralight scalars as cosmological dark matter
• On the Geometry of the String Landscape and the Swampland
• Symmetries and Strings in Field Theory and Gravity
• The Swampland: Introduction and Review
• Secluded U(1) below the weak scale
• New Fixed-Target Experiments to Search for Dark Gauge Forces
• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• Bosonic super-WIMPs as keV-scale dark matter
• Lectures on the Swampland Program in String Compactifications
• Probing a Secluded U(1) at B-factories
• Dark photon limits: a handbook
• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• Tension between the power spectrum of density perturbations measured on large and small scales
• Making dark matter out of light: freeze-in from plasma effects
• Natural Inflation and Quantum Gravity
• Dark Photon Dark Matter from a Network of Cosmic Strings
• On the Possibility of Large Axion Moduli Spaces
• Nonabelian dark matter: models and constraints
• A Search for Hidden Sector Photons with ADMX
• On the Particle Interpretation of the PVLAS Data: Neutral versus Charged Particles
• Causality, Unitarity, and the Weak Gravity Conjecture
• Probing Hidden Sector Photons through the Higgs Window
• First results from the new PVLAS apparatus: a new limit on vacuum magnetic birefringence
• The Early Dark Sector, the Hubble Tension, and the Swampland
• The FL bound and its phenomenological implications
• Microwave cavity light shining through a wall optimization and experiment
• Cryogenic resonant microwave cavity searches for hidden sector photons
• Dark Photon Dark Matter without Stueckelberg Mass
• Dark Photons in the Solar Basin
• Searching for Elusive Dark Sectors with Terrestrial and Celestial Observations
• CFTs Blueshift Tensor Fluctuations Universally
• Challenging the Stability of Light Millicharged Dark Matter
• Thermal Perturbations from Cosmological Constant Relaxation

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• Direct detection of dark photon dark matter using radio telescopes
• The Inflated Chern-Simons Number in Spectator Chromo-Natural Inflation
• Confinement in de Sitter Space and the Swampland
• Testing CCC+TL Cosmology with Galaxy Rotation Curves
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Confinement from Distance in Metric Space and its Relation to Cosmological Constant
• Species scale associated with Weinberg operator and bound on Majorana neutrino mass