Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Ferreira, Ricardo Z."'
Autor:
Ferreira, Ricardo Z., Muyor, Ángel Gil
In this work, we study the luminosity that results from the conversion of QCD axion particles into photons in the magnetic field of the plasma accreting onto black holes (BHs). For the luminosities to be large two conditions need to be met: i) there
Externí odkaz:
http://arxiv.org/abs/2404.12437
Unstable domain wall (DW) networks in the early universe are cosmologically viable and can emit a large amount of gravitational waves (GW) before annihilating. As such, they provide an interpretation for the recent signal reported by Pulsar Timing Ar
Externí odkaz:
http://arxiv.org/abs/2401.14331
The evidence for a non-vanishing isotropic cosmic birefringence in recent analyses of the CMB data provides a tantalizing hint for new physics. Domain wall (DW) networks have recently been shown to generate an isotropic birefringence signal in the ba
Externí odkaz:
http://arxiv.org/abs/2312.14104
Dark matter energy injection in the early universe modifies both the ionization history and the temperature of the intergalactic medium. In this work, we improve the CMB bounds on sub-keV dark matter and extend previous bounds from Lyman-$\alpha$ obs
Externí odkaz:
http://arxiv.org/abs/2303.07426
We analyze the dynamics and observational signatures of axion clouds formed via the superradiant instability around primordial black holes, focusing on the mass range $10^{14}-10^{18}$ kg where the latter may account for all the dark matter. We take
Externí odkaz:
http://arxiv.org/abs/2301.01780
Publikováno v:
JCAP11(2022)057
We show that in theories of axionlike particles (ALPs) coupled to electrons at tree-level, the one-loop effective coupling to photons is process dependent: the effective coupling relevant for decay processes, $g_{a\gamma}^{\text{(D)}}$, differs signi
Externí odkaz:
http://arxiv.org/abs/2205.07896
We present a model-independent search for the gravitational wave background from cosmic domain walls (DWs) in the NANOGrav 12.5 years dataset and International PTA Data Release 2. DWs that annihilate at temperatures $\sim 20-50~\text{MeV}$ with tensi
Externí odkaz:
http://arxiv.org/abs/2204.04228
Several laboratory experiments have published limits on axionlike particles (ALPs) with feeble couplings to electrons and masses in the keV-MeV range, under the assumption that such ALPs comprise the dark matter. We note that ALPs decay radiatively i
Externí odkaz:
http://arxiv.org/abs/2202.08858
The axion solution to the strong CP problem is delicately sensitive to Peccei-Quinn breaking contributions that are misaligned with respect to QCD instantons. Heavy QCD axion models are appealing because they avoid this so-called "quality problem". W
Externí odkaz:
http://arxiv.org/abs/2107.07542
Publikováno v:
Phys. Rev. D 103, 063524 (2021)
We perform for the first time a dedicated analysis of cosmological constraints on DFSZ QCD axion models. Such constructions are especially interesting in light of the recent Xenon-1T excess and of hints from stellar cooling. In DFSZ models, for $m_a\
Externí odkaz:
http://arxiv.org/abs/2012.06566