Radio-emission of axion stars

  title={Radio-emission of axion stars},
  author={D. G. Levkov and Alexander Panin and Igor Tkachev},
  journal={Physical Review D},
We study parametric instability of compact axion dark matter structures decaying to radiophotons. Corresponding objects - Bose (axion) stars, their clusters, and clouds of diffuse axions - form abundantly in the postinflationary Peccei-Quinn scenario. We develop general description of parametric resonance incorporating finite-volume effects, backreaction, axion velocities and their (in)coherence. With additional coarse-graining, our formalism reproduces kinetic equation for virialized axions… 

An Effective Field Theory for Large Oscillons

: We consider oscillons — localized, quasiperiodic, and extremely long-living classical solutions in models with real scalar fields. We develop their effective description in the limit of large size at

Condensation and Evaporation of Boson Stars

. Axion-like particles, including the QCD axion, are well-motivated dark matter candidates. Numerical simulations have revealed coherent soliton configurations, also known as boson stars, in the

Dark Matter In Extreme Astrophysical Environments

Exploring dark matter via observations of extreme astrophysical environments — defined here as heavy compact objects such as white dwarfs, neutron stars, and black holes, as well as supernovae and

Axion echoes from the supernova graveyard

: Stimulated decays of axion dark matter, triggered by a source in the sky, could produce a photon flux along the continuation of the line of sight, pointing backward to the source. The strength of

Polarized solitons in higher-spin wave dark matter

We first show that the effective non-relativistic theory of gravitationally interacting, massive integer-spin fields (spin-0, 1, and 2 in particular) is described by a 2s + 1 component

Axion dark matter echo: A detailed analysis

Ariel Arza and Elisa Todarello Institute for Theoretical and Mathematical Physics, Lomonosov Moscow State University (ITMP), 119991 Moscow, Russia Institut für Astroteilchenphysik, Karlsruhe

Production of massive bosons from the decay of a massless particle beam

Taking a two interacting scalar toy model with interaction term gφχ, we study the production of χ-particles coming from the decay of an asymptotic and highly occupied beam of φ-particles. We perform

The Echo Method for Axion Dark Matter Detection

All the relevant results found so far are summarized, including analytical formulas for the echo signal, as well as sensitivity prospects for possible near-future experiments.

Looking at the NANOGrav signal through the anthropic window of axionlike particles

We explore the inflationary dynamics leading to formation of closed domain walls in course of evolution of an axion like particle (ALP) field whose Peccei-Quinn-like phase transition occurred well




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JCAP 1811

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