cosmic background radiation
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2021 ◽  
Vol 922 (1) ◽  
pp. 32
Author(s):  
Ellis R. Owen ◽  
Qin Han ◽  
Kinwah Wu ◽  
Y. X. Jane Yap ◽  
Pooja Surajbali

Abstract Ultra-high-energy (UHE) cosmic rays (CRs) of energies ∼(1018–1020) eV, accelerated in violent astrophysical environments, interact with cosmic background radiation fields via photo-hadronic processes, leading to strong attenuation. Typically, the Universe would become “opaque” to UHE CRs after several tens of megaparsecs, setting the boundary of the Greisen–Zatsepin–Kuz’min (GZK) horizon. In this work, we investigate the contribution of sources beyond the conventional GZK horizon to the UHE CR flux observed on Earth, when photospallation of the heavy nuclear CRs is taken into account. We demonstrate that this contribution is substantial, despite the strong attenuation of UHE CRs. A significant consequence is the emergence of an isotropic background component in the observed flux of UHE CRs, coexisting with the anisotropic foreground component that is associated with nearby sources. Multi-particle CR horizons, which evolve over redshift, are determined by the CR nuclear composition. Thus, they are dependent on the source populations and source evolutionary histories.


2021 ◽  
Author(s):  
Andre Steynberg

Abstract A successful single parameter model has been formulated to match the observations of photons from type 1a supernovae which were previously used to corroborate the standard 𝛬 cold dark matter model. The new single parameter model extrapolates all the way back to the cosmic background radiation (CMB) without requiring a separate model to describe inflation of the space dimensions after the Big Bang. The model for the redshift progression of a photon is: 1 + z =\(\frac{\text{sin}\left(\frac{13.8}{T}\right)\pi /2}{\text{sin}\left(\frac{t}{T}\right)\pi /2}\) T is the fitted parameter and t is the time when the photon was emitted, both measured in billions of years from time zero in the Big Bang. The angle is expressed in radians. The number 13.8 should be updated if an improved estimate for the time elapsed since the Big Bang is found. The single parameter model assumes that spacetime forms a finite symmetrical manifold with positive curvature.


2021 ◽  
Vol 4 (2) ◽  

Dark energy was created to interpret astronomical observations that the earlier standard model of cosmology could not explain. First, measurements of the pattern of cosmic background radiation revealed that the universe must be large-scale flat, corresponding to an average density greater than the "dark" and visible matter combined account for.


2021 ◽  
Author(s):  
Andre Steynberg

Abstract A successful single parameter model has been formulated to match the observations of photons from type 1a supernovae which were previously used to corroborate the standard 𝛬 cold dark matter model. The new single parameter model extrapolates all the way back to the cosmic background radiation (CMB) without requiring a separate model to describe inflation of the space dimensions after the Big Bang. The model for the redshift progression of a photon is: 1 + z =\(\frac{\text{sin}\left(\frac{13.8}{T}\right)\pi /2}{\text{sin}\left(\frac{t}{T}\right)\pi /2}\) T is the fitted parameter and t is the time when the photon was emitted, both measured in billions of years from time zero in the Big Bang. The angle is expressed in radians. The number 13.8 should be updated if an improved estimate for the time elapsed since the Big Bang is found. The single parameter model assumes that spacetime forms a finite symmetrical manifold with positive curvature.


2021 ◽  
Vol 55 (6) ◽  
pp. 28-33
Author(s):  
A. Beke ◽  
◽  
G. Erdős ◽  

Objective: Examining the incidence of X-monosomy among chromosomal aneuploidies with relation to cosmic background radiation. Method: We have processed the results of prenatal chromosome investigations performed in the 26-year period between 1990 and 2015. In the current study, we have paid special attention to abnormalities affecting the fetal sex chromosomes. The incidence of X-monosomy among sex chromosomal aneuploidies was studied in view of the intensity of cosmic background radiation. Results: In the 26-year period total of 43,272 fetal chromosomal investigations were carried out at our Department. In that period, sex chromosomal abnormality was detected in 230 cases (0.53 %), 92 of which (0.21 %) turned out to be X-monosomies. An uneven incidence ratio of X-monosomy could be observed as producing a wave line. As compared to nearby years, a peak was noted in 1997 (17 cases), somewhat smaller peak involving six cases was observed in 2002, likewise, 2008 yielded another small peak with five cases. Similar curves were obtained when mosaic and non-mosaic forms were studied separately. Based on the above, we looked for a mutagenic effect that could have been present in an explicit form around about the year 1997 and be associated with the higher incidence of X-monosomy in that period. An increase in the intensity of cosmic radiation could be one of those effects. The extremely high rate of chromosomal aberrations in 1997 coincided with the local minimum of the solar flares, therefore solar radiation could not be blamed for those aberrations. At the same time, however is suggestive of a causal relationship between the increase in galactic cosmic background radiation flux and higher incidence of X-monosomy around about 1997. Conclusions: Examining the incidence of sex chromosome aberrations, with special regard to X-monosomy, we have concluded the latter occurred more frequently during higher cosmic background radiation.


2020 ◽  
Vol 5 (3) ◽  
Author(s):  
Constantinos Krikos

From the measurements of the anisotropies of the cosmic background radiation at the present time, we get a value for the density parameter (Ω(t)) near to unit, i.e. Ω(t) ∼ 1. The value of the density parameter determines if the Universe is open (Ω(t) < 1), flat (Ω(t) = 1) or closed (Ω(t) > 1)). This result forces us to assume that the boundary of the Universe is a 2D flat space, i.e. the R2 , since its interior is a 3D space as we conceive it. The R2 space is characterized by isotropy and homogeneity. It is a simply connected space and that it does not exhibit any particular characteristic anywhere. These attributes are expressed by a circle of an infinite radius in the center of which is an observer, at every point in the Universe. Since circle is the geometric object from which all other conic sections produced, then we shall examine the equations that characterize them and the consequences of their mappings in the interior of the Universe through one to one correspondences.


Author(s):  
Chang-Wei Hu

Modern cosmology, based on the existing theoretical physics, combined with astronomical observations and a number of assumptions, formed a relatively complete theoretical system, but it was accompanied by confusion from beginning to end. Singularity, skyrocketing, dark matter, dark energy, etc. are all difficult to solve. Modern theoretical physics has certain limitations. It is questionable to describe the whole universe on the basis of it. At present, the interpretation of observational facts such as cosmological redshift and cosmic background radiation are also seem to be far-fetched. Based on the understanding of the vacuum effect and the fact of the interval effect of the field, an infinite order hierarchical cosmic model is proposed.


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