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pro vyhledávání: '"A., Valent"'
The standard cosmological model currently in force, aka $\Lambda$CDM, has been plagued with a variety of tensions in the last decade or so, which puts it against the wall. At the core of the $\Lambda$CDM we have a rigid cosmological term, $\Lambda$,
Externí odkaz:
http://arxiv.org/abs/2412.15124
Autor:
Valent, Tullio
The initial part of this paper is devoted to the notion of pseudo-seminorm on a vector space $E$. We prove that the topology of every topological vector space is defined by a family of pseudo-seminorms (and so, as it is known, it is uniformizable). T
Externí odkaz:
http://arxiv.org/abs/2409.06574
Current cosmological observations allow for deviations from the standard growth of large-scale structures in the universe. These deviations could indicate modifications to General Relativity on cosmological scales or suggest the dynamical nature of d
Externí odkaz:
http://arxiv.org/abs/2408.16388
Looking at the well-known Hubble tension as a tension in the calibrators of the cosmic distance ladder, i.e. the absolute magnitude $M$ of standard candles such as supernovae of Type Ia (SNIa) and the standard ruler represented by the comoving sound
Externí odkaz:
http://arxiv.org/abs/2405.17643
Several studies in the literature have found a disagreement between data on Baryon Acoustic Oscillations (BAO) derived using two distinct methodologies: the two-dimensional (2D or angular) BAO, which extracts the BAO signal from the angular two-point
Externí odkaz:
http://arxiv.org/abs/2405.12142
Publikováno v:
2024 ApJ 975 64
The idea of composite dark energy (DE) is quite natural since on general grounds we expect that the vacuum energy density (associated with the cosmological term $\Lambda$) may appear in combination with other effective forms of DE, denoted X. Here we
Externí odkaz:
http://arxiv.org/abs/2404.18845
Autor:
Valent, Tullio
Two approaches to Lipschitz structures for any set are presented, studied and compared. The first approach is similar to the one proposed in Fraser, Jr. R. B., Axiom systems for Lipschitz structures, Fundamenta Mathematicae, (1970), where Lipschitz s
Externí odkaz:
http://arxiv.org/abs/2404.14026
Autor:
Valent, Tullio
In this paper we attempt to present a very general approach to the study of structures (somehow) defined on a set $X$ by a family of maps $d: X \times X \mapsto \mathbb{R}^+$. It will be shown how the assignment of a preorder $\prec_{\Pi}$ on a set $
Externí odkaz:
http://arxiv.org/abs/2404.03697
Current data on baryon acoustic oscillations and Supernovae of Type Ia cover up to $z\sim 2.5$. These observations play a very important role in the determination of cosmological parameters and have been widely used to constrain the $\Lambda$CDM and
Externí odkaz:
http://arxiv.org/abs/2402.13115
We study scatter-like interactions between neutrinos and dark matter in light of different combinations of temperature, polarization and lensing data released by three independent CMB experiments - the Planck satellite, the Atacama Cosmology Telescop
Externí odkaz:
http://arxiv.org/abs/2311.09116