Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Von Marttens, Rodrigo"'
Autor:
Hipólito-Ricaldi, Wiliam S., von Marttens, Rodrigo, de Melo-Santos, Felipe, Rodrigues, Davi C.
We investigate the observational implications of a gravitational model wherein the gravitational constant $G$ and the cosmological constant $\Lambda$ exhibit scale-dependent behavior at the perturbative level, while preserving the General Relativity
Externí odkaz:
http://arxiv.org/abs/2411.12097
We propose a two parameters extension of the flat $\Lambda$CDM model to capture the impact of matter inhomogeneities on the background evolution of the Universe. Non virialized but non-linearly evolving overdense and underdense regions, whose abundan
Externí odkaz:
http://arxiv.org/abs/2410.15295
It is well-known that Einstein's equations constrain only the total energy-momentum tensor of the cosmic substratum, without specifying the characteristics of its individual constituents. Consequently, cosmological models featuring distinct decomposi
Externí odkaz:
http://arxiv.org/abs/2403.12220
Autor:
Wu, Sirui, Napolitano, Nicola R., Tortora, Crescenzo, von Marttens, Rodrigo, Casarini, Luciano, Li, Rui, Lin, Weipeng
Publikováno v:
A&A 686, A80 (2024)
The galaxy total mass inside the effective radius encode important information on the dark matter and galaxy evolution model. Total "central" masses can be inferred via galaxy dynamics or with gravitational lensing, but these methods have limitations
Externí odkaz:
http://arxiv.org/abs/2310.02816
Autor:
Rodrigues, Jamerson G., Oliveira, Vinícius, von Marttens, Rodrigo, Pires, Carlos A. de S., Alcaniz, Jailson
In this work, we investigate the physical aspects of the inflection-point inflation scenario and assess its observational viability in light of current Cosmic Microwave Background (CMB) data. The model we consider encapsulates the inflaton with a pse
Externí odkaz:
http://arxiv.org/abs/2309.09842
The fact that Einstein's equations connect the space-time geometry to the total matter content of the cosmic substratum, but not to individual contributions of the matter species, can be translated into a degeneracy in the cosmological dark sector. S
Externí odkaz:
http://arxiv.org/abs/2208.06302
Autor:
von Marttens, Rodrigo, Casarini, Luciano, Napolitano, Nicola R., Wu, Sirui, Amaro, Valeria, Li, Rui, Tortora, Crescenzo, Canabarro, Askery, Wang, Yang
Next-generation surveys will provide photometric and spectroscopic data of millions to billions of galaxies with unprecedented precision. This offers a unique chance to improve our understanding of the galaxy evolution and the unresolved nature of da
Externí odkaz:
http://arxiv.org/abs/2111.01185
Publikováno v:
In Physics of the Dark Universe July 2024 45
Autor:
Andrade, Uendert, Anbajagane, Dhayaa, von Marttens, Rodrigo, Huterer, Dragan, Alcaniz, Jailson
Publikováno v:
JCAP 11 (2021) 014
We perform a general test of the $\Lambda{\rm CDM}$ and $w {\rm CDM}$ cosmological models by comparing constraints on the geometry of the expansion history to those on the growth of structure. Specifically, we split the total matter energy density, $
Externí odkaz:
http://arxiv.org/abs/2107.07538
The results of joint analyses of available cosmological data have motivated an important debate about a possible detection of a non-zero spatial curvature. If confirmed, such a result would imply a change in our present understanding of cosmic evolut
Externí odkaz:
http://arxiv.org/abs/2104.13455