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Journal of Cosmology and Astroparticle Physics
ISSN 1475-7508 · Institute of Physics · 24 artikel di indeks
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DESI 2024 III: baryon acoustic oscillations from galaxies and quasars
Abstract We present the DESI 2024 galaxy and quasar baryon acoustic oscillations (BAO) measurements using over 5.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1. Divided by tracer type, we utilize 300,017 galaxies from the magnitude-limited Bright Galaxy Survey with 0.1 < z…
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DESI 2024 VI: cosmological constraints from the measurements of baryon acoustic oscillations
Abstract We present cosmological results from the measurement of baryon acoustic oscillations (BAO) in galaxy, quasar and Lyman- α forest tracers from the first year of observations from the Dark Energy Spectroscopic Instrument (DESI), to be released in the DESI Data Release 1. DESI BAO provide…
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DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest
Abstract We present the measurement of Baryon Acoustic Oscillations (BAO) from the Lyman- α (Ly α ) forest of high-redshift quasars with the first-year dataset of the Dark Energy Spectroscopic Instrument (DESI). Our analysis uses over 420 000 Ly α forest spectra and their correlation with the…
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Science with the Einstein Telescope: a comparison of different designs
Abstract The Einstein Telescope (ET), the European project for a third-generation gravitational-wave detector, has a reference configuration based on a triangular shape consisting of three nested detectors with 10 km arms, where each detector has a 'xylophone' configuration made of an…
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CMB lensing from Planck PR4 maps
Abstract We reconstruct the Cosmic Microwave Background (CMB) lensing potential on the latest Planck CMB PR4 (NPIPE) maps, which include slightly more data than the 2018 PR3 release, and implement quadratic estimators using more optimal filtering. We increase the reconstruction signal to noise by…
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Nonlinear electrodynamics effects on the black hole shadow, deflection angle, quasinormal modes and greybody factors
Abstract In this paper, we discuss the effects of nonlinear electrodynamics (NED) on non-rotating black holes, parametrized by the field coupling parameter β and magnetic charge parameter P in detail. Particularly, we survey a large range of observables and physical properties of the magnetically…
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Towards a precision calculation of the effective number of neutrinos N eff in the Standard Model. Part II. Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED
Abstract We present in this work a new calculation of the standard-model benchmark value for the effective number of neutrinos, N eff SM , that quantifies the cosmological neutrino-to-photon energy densities. The calculation takes into account neutrino flavour oscillations, finite-temperature…
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Cobaya: code for Bayesian analysis of hierarchical physical models
Abstract We present , a general-purpose Bayesian analysis code aimed at models with complex internal interdependencies. Without the need for specific code by the user, interdependencies between different stages of a model pipeline are exploited for sampling efficiency: intermediate results are…
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AION: an atom interferometer observatory and network
We outline the experimental concept and key scientific capabilities of AION (Atom Interferometer Observatory and Network), a proposed experimental programme using cold strontium atoms to search for ultra-light dark matter, to explore gravitational waves in the mid-frequency range between the peak…
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Probing the gravitational wave background from cosmic strings with LISA
Probing the gravitational wave background from cosmic strings with LISA, Auclair, Pierre, Blanco-Pillado, Jose J., Figueroa, Daniel G., Jenkins, Alexander C., Lewicki, Marek, Sakellariadou, Mairi, Sanidas, Sotiris, Sousa, Lara, Steer, Danièle A., Wachter, Jeremy M., Kuroyanagi, Sachiko
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The Atacama Cosmology Telescope: a measurement of the Cosmic Microwave Background power spectra at 98 and 150 GHz
We present the temperature and polarization angular power spectra of the CMB measured by the Atacama Cosmology Telescope (ACT) from 5400 deg2of the 2013–2016 survey, which covers >15000 deg2at 98 and 150 GHz. For this analysis we adopt a blinding strategy to help avoid confirmation bias and…
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Cosmological parameters from the BOSS galaxy power spectrum
We present cosmological parameter measurements from the publicly available Baryon Oscillation Spectroscopic Survey (BOSS) data on anisotropic galaxy clustering in Fourier space. Compared to previous studies, our analysis has two main novel features. First, we use a complete perturbation theory…
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The cosmological analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure
The Effective Field Theory of Large-Scale Structure is a formalism that allows us to predict the clustering of Cosmological Large-Scale Structure in the mildly non-linear regime in an accurate and reliable way. After validating our technique against several sets of numerical simulations, we perform…
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Big-Bang Nucleosynthesis after Planck
We assess the status of big-bang nucleosynthesis (BBN) in light of the final Planck data release and other recent developments, and in anticipation of future measurements. Planck data from the recombination era fix the cosmic baryon density to 0.9% precision, and now damping tail measurements…
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Magnetically charged black holes from non-linear electrodynamics and the Event Horizon Telescope
Non-linear electrodynamics (NLED) theories are well-motivated extensions of QED in the strong field regime, and have long been studied in the search for regular black hole (BH) solutions. We consider two well-studied and well-motivated NLED models coupled to General Relativity: the Euler-Heisenberg…
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A precision calculation of relic neutrino decoupling
We study the distortions of equilibrium spectra of relic neutrinos due to the interactions with electrons, positrons, and neutrinos in the early Universe. We solve the integro-differential kinetic equations for the neutrino density matrix, including three-flavor oscillations and finite temperature…
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Neutrino decoupling including flavour oscillations and primordial nucleosynthesis
We revisit the decoupling of neutrinos in the early universe with flavour oscillations. We rederive the quantum kinetic equations which determine the neutrino evolution based on a BBGKY-like hierarchy, and include for the first time the full collision term, with both on- and off-diagonal terms for…
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Science case for the Einstein telescope
The Einstein Telescope (ET), a proposed European ground-based gravitational-wave detector of third-generation, is an evolution of second-generation detectors such as Advanced LIGO, Advanced Virgo, and KAGRA which could be operating in the mid 2030s. ET will explore the universe with gravitational…
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The Atacama Cosmology Telescope: DR4 maps and cosmological parameters
We present new arcminute-resolution maps of the Cosmic Microwave Background temperature and polarization anisotropy from the Atacama Cosmology Telescope, using data taken from 2013–2016 at 98 and 150 GHz. The maps cover more than 17,000 deg 2 , the deepest 600 deg 2 with noise levels below…
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Detecting gravitational waves from cosmological phase transitions with LISA: an update
We investigate the potential for observing gravitational waves from cosmological phase transitions with LISA in light of recent theoretical and experimental developments. Our analysis is based on current state-of-the-art simulations of sound waves in the cosmic fluid after the phase transition…