Uncover the latest and most impactful research in Early Universe. Explore pioneering discoveries, insightful ideas and new methods from leading researchers in the field.
In this work, we propose a unified treatment for the creation of scalar particles in de Sitter and radiation-dominated backgrounds using the Ermakov–Lewis invariant. We rely on two representations of the quantum field; the first one diagonalizes the...
The first generation of stars, known as population III (Pop III), formed from primordial gas consisting solely of hydrogen and helium and is believed to have emerged only a few hundred million years after the Big Bang. Detecting the chemical...
The one-state statement for closed universes has sparked considerable discussion. In this paper, we examine its physical meaning in the context of the Hartle-Hawking state and de Sitter space. We argue that the one-state property of closed universes...
Models predict that chemical enrichment and gas redistribution should begin rapidly once star formation starts, but direct constraints at the earliest epochs have been scarce. Here we show that metal-enriched gas in multiple ionic phases was already...
A key question in cosmology is whether massive neutrinos exist on cosmic scales. Current cosmological observations have severely compressed the viable range for neutrino masses and even prefer phenomenologically an effective negative mass. This...
In this study, we investigate the fermionic helical asymmetry during preheating by introducing a model in which the Dirac field \(\psi \) ψ couples to the scalar inflaton \(\phi \) ϕ directly through the pseudoscalar Yukawa mechanism described by...
The James Webb Space Telescope has unlocked uncharted territory for the study of early black holes, enabling the detection of fainter and smaller black holes at larger cosmological distances than previously possible. Compared with nearby massive...
The origin of supermassive black holes remains a long-standing problem in astrophysics. Recent James Webb Space Telescope (JWST) observations reveal an unexpectedly abundant population of overmassive black holes at z> 4–6, at which the black hole...
Abstract NICA is a tool to investigate the early Universe in laboratory. It would be reasonable to recall some essential issues in physical cosmology development. GR was created by A. Einstein in 1915. In 1917 Einstein proposed the first (static)...
The cosmic dark ages offer a pristine, astrophysically unadulterated window into fundamental cosmology. Unlike the two-dimensional snapshot provided by the cosmic microwave background (CMB), the redshifted 21-cm signal from neutral hydrogen enables...
We consider a modular-invariant extension of the Standard Model. Assuming that the modulus is the inflaton, the CP-violating phases of the Yukawa couplings evolve during inflation. This dynamics favours a Higgs condensate, so that Standard Model...
The FAST All Sky Hi Survey (FASHI) conducted with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) has mapped ∼19500 deg2 of the sky north of DEC = −14°, detecting 156 411 extragalactic Hi sources at z< 0.09 with a median...
Little red dots (LRDs) are a new class of object uncovered by JWST deep surveys. Although they are probably associated with active galactic nuclei (AGNs), their enigmatic properties challenge the canonical AGN paradigm and have stimulated numerous...
B mesogenesis offers an interesting mechanism to generate the baryon asymmetry of the universe by converting the CP violation of the Standard Model into a net baryon number asymmetry. In this work we extend the Bmesogenesis framework by...
We use holography to study dS-invariant states of non-conformal, strongly coupled quantum field theories in four-dimensional de Sitter space. We show that out-of-equilibrium effects can sustain the exponential inflation within the regime of validity...
We apply the holographic principle based on the generalized infrared cut-off introduced by Nojiri-Odintsov [1, 2] for describing cosmological models of the universe induced by a viscous fluid in a spatially flat Friedmann-Lemaître-Robertson-Walker...
About 15 years ago, a new type of extreme (with kinetic energies of \(\textrm{E}_k \sim 10^{47-49}\) E k ∼ 10 47 - 49 erg) molecular outflows associated with very luminous ( \(\ge \) ≥ \(10^5\) 10 5 \(\textrm{L}_\odot \) L ⊙ ) and massive (...
We investigate a pre-inflationary dynamical compactification scenario in which a higher-dimensional expanding universe evolves into an effectively four-dimensional one through curvature-assisted modulus trapping. To obtain a calculable semiclassical...
We develop a phenomenological model in which the observed late-time dark-energy sector is interpreted as an effective residual tension of space. Motivated by recent observational hints that the dark-energy equation of state may exhibit mild...
Journal
Astrophysics and Space Sciencepublishes original contributions and invited reviews covering the entire range of astronomy, astrophysics,...
Journal
Nature Astronomy is a truly multidisciplinary journal for the field, representing — and fostering closer interaction between — all of the key...
General Relativity and Gravitationis a journal devoted to all aspects of modern gravitational science, and published under the auspices of the...
