English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We consider an alternative cold dark matter candidate, ultralight bosons($m>10^{-22}$eV) described by a complex scalar field (SFDM) with global U(1)symmetry, with comoving particle number density conserved after particleproduction during standard reheating. We allow for repulsive self-interaction.In a Lambda-SFDM universe, SFDM starts relativistic, evolving from stiff (w=1)to radiation-like (w=1/3), becoming nonrelativistic (w=0) at late times. Thus,a stiff-SFDM-dominated era precedes the familiar radiation-dominated era. SFDMparticle mass $m$ and quartic self-interaction strength \lambda, are thereforeconstrained by cosmological observables, N_{eff}, the effective number ofneutrino species during BBN, and z_{eq}, the matter-radiation equalityredshift. Since the stochastic gravitational wave background (SGWB) frominflation is amplified during the stiff-SFDM-dominated era, it can alsocontribute a radiationlike component large enough to affect these observables.Remarkably, this amplification makes this SGWB detectable by current GWexperiments, e.g., aLIGO/Virgo and LISA, for Lambda-SFDM models satisfyingcosmological constraints, for a range of reheat temperatures T_{re} andcurrently allowed values of tensor-to-scalar ratio $r$. For given r and$\lambda/(mc^2)^2$, the marginally-allowed Lambda-SFDM model for each T_{re}has the smallest m that satisfies cosmological constraints. For example, formarginally-allowed models with r=0.01 and$\lambda/(mc^2)^2=10^{-18}$eV$^{-1}$cm$^3$, null detection by the aLIGO O1 runexcludes 8.75*10^3<T_{re} (GeV)<1.7*10^5 at 95% confidence, demonstrating thatGW experiments already place a new kind of cosmological constraint on SFDM. Awider parameter range should be accessible to aLIGO/Virgo O5, with potential todetect this signature of Lambda-SFDM. For this same illustrative family,3-sigma detection is predicted for 600<T_{re} (GeV)<10^7.

physical review. d/physical review. d.

Bose-Einstein-condensed scalar field dark matter and the gravitational  wave background from inflation: new cosmological constraints and its  detectability by LIGO