Výsledky vyhledávání - "resonance, parametric"

ALP Dark Matter Mini-Clusters from Kinetic Fragmentation

Publikováno v: Journal of cosmology and astroparticle physics 01(01), 009 (2023). doi:10.1088/1475-7516/2023/01/009

Journal of cosmology and astroparticle physics 01(01), 009 (2023). doi:10.1088/1475-7516/2023/01/009
We show that very compact axion mini-clusters can form in models where axion-like-particle (ALP) dark matter is produced via the kinetic misalig

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0137ca9b65708b76dcf9efa17681113c
http://arxiv.org/abs/2207.10111

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ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures

Autor: Chatrchyan, Aleksandr, Eröncel, Cem, Koschnitzke, Matthias, Servant, Géraldine

Axion-like particles (ALPs) are leading candidates to explain the dark matter in the universe. Their production via the misalignment mechanism has been extensively studied for cosine potentials characteristic of pseudo-Nambu-Goldstone bosons. In this

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Nonrelativistic formation of scalar clumps as a candidate for dark matter

Autor: Philippe Brax, Patrick Valageas, Jose A. R. Cembranos

Publikováno v: Physical Review D
Physical Review D, 2020, 102 (8), pp.083012. ⟨10.1103/PhysRevD.102.083012⟩
Physical Review D, American Physical Society, 2020, 102 (8), pp.083012. ⟨10.1103/PhysRevD.102.083012⟩
E-Prints Complutense: Archivo Institucional de la UCM
Universidad Complutense de Madrid
E-Prints Complutense. Archivo Institucional de la UCM
instname

We propose a new mechanism for the formation of dark matter clumps in the radiation era. We assume that a light scalar field is decoupled from matter and oscillates harmonically around its vacuum expectation value. We include self-interactions and co

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e2b07434ba37af448ffeb7573c7cb90
https://doi.org/10.1103/physrevd.102.083012

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Time-Scales for Nonlinear Processes in Preheating after Multifield Inflation with Nonminimal Couplings

Autor: Evangelos I. Sfakianakis, Jorinde van de Vis, John T. Giblin, David Kaiser, Rachel Nguyen

Publikováno v: Physical review / D 102(4), 043528 (2020). doi:10.1103/PhysRevD.102.043528

Physical review / D 102(4), 043528 (1-24) (2020). doi:10.1103/PhysRevD.102.043528
We have conducted extensive lattice simulations to study the postinflation dynamics of multifield models involving nonminimal couplings. We explore the parameter d

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Oscillating scalar fields and the Hubble tension: a resolution with novel signatures

Autor: Tristan L. Smith, Vivian Poulin, Mustafa A. Amin

Publikováno v: Physical Review D
Physical Review D, American Physical Society, 2020, 101 (6), pp.063523. ⟨10.1103/PhysRevD.101.063523⟩
Phys.Rev.D
Phys.Rev.D, 2020, 101 (6), pp.063523. ⟨10.1103/PhysRevD.101.063523⟩

We present a detailed investigation of a sub-dominant oscillating scalar field ('early dark energy', EDE) in the context of resolving the Hubble tension. Consistent with earlier work, but without relying on fluid approximations, we find that a scalar

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::068b89972c3f8719a220f2e2d0e20740
https://hal.archives-ouvertes.fr/hal-02302882/document

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Cosmological Backgrounds of Gravitational Waves

Autor: Chiara Caprini, Daniel G. Figueroa

Publikováno v: Class.Quant.Grav.
Class.Quant.Grav., 2018, 35 (16), pp.163001. ⟨10.1088/1361-6382/aac608⟩
Classical and Quantum Gravity

Gravitational waves (GWs) have a great potential to probe cosmology. We review early universe sources that can lead to cosmological backgrounds of GWs. We begin by presenting definitions of GWs in flat space-time and in a cosmological setting, and di

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::88a8251c7aca3424193f042fc109b186
https://hal.archives-ouvertes.fr/hal-01703601

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Ultrasonic resonance of defects for nonlinear acoustic imaging and NDT

Autor: Solodov Igor

The effect of local defect resonance (LDR) on the nonlinear ultrasonic response of defects is studied and applied for enhancement of sensitivity of nonlinear ultrasonic NDT. As the local vibration amplitude increases, the LDR-“amplifier” exhibits

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