Zobrazeno 1 - 10
of 190
pro vyhledávání: '"cosmic inflation"'
Autor:
Jean-Luc Lehners, Jerome Quintin
Publikováno v:
Physics Letters B, Vol 850, Iss , Pp 138488- (2024)
Many cosmological models assume or imply that the total size of the universe is very large, perhaps even infinite. Here we argue instead that the universe might be comparatively small, in fact not much larger than the currently observed size. A concr
Externí odkaz:
https://doaj.org/article/367500b1033f46e084bc2c20b5e04575
Autor:
Zubairy, M. Suhail, author
Publikováno v:
A Mysterious Universe : Quantum Mechanics, Relativity, and Cosmology for Everyone, 2023, ill.
Externí odkaz:
https://doi.org/10.1093/oso/9780198883067.003.0018
Autor:
Hyun Seok Yang
Publikováno v:
Universe, Vol 10, Iss 3, p 150 (2024)
We present a novel background-independent framework for cosmic inflation, starting with a matrix model. In this framework, inflation is portrayed as a dynamic process responsible for the generation of both space and time. This stands in contrast to c
Externí odkaz:
https://doaj.org/article/0f56246c663d4b33b2633c9b1c7a8f58
Publikováno v:
Physics Letters B, Vol 843, Iss , Pp 138028- (2023)
We present first results from a novel numerical relativity code based on a tetrad formulation of the Einstein-scalar field equations combined with recently introduced gauge/frame invariant diagnostics. The results provide support for the argument tha
Externí odkaz:
https://doaj.org/article/da30fbfc6c20415fb380ec144e636b24
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 275 (2024)
The present work begins by examining the early-Universe inflationary epoch of a special K-essence model, which incorporates a linear coupling term between the scalar field potential and the canonical Lagrangian. For the power-law potential, we both n
Externí odkaz:
https://doaj.org/article/3df658731365474ab730ec35305d47eb
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 275, Iss 1, p 14 (2024)
We study a realization of the inflationary scenario where the Peccei–Quinn (PQ) symmetry is spontaneously broken during inflation, facilitated by its nonminimal coupling to gravity. This results in, effectively, a two-field inflation: the early sta
Externí odkaz:
https://doaj.org/article/c8e9f551b3154bebb9d12b7b4eace083
Autor:
Soma Heydari, Kayoomars Karami
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 148 (2024)
In this work, a new fast-roll (FR) mechanism to generate primordial black holes (PBHs) and gravitational waves (GWs) in generalized noncanonical natural inflation is introduced. In this model, choosing a suitable function for noncanonical mass scale
Externí odkaz:
https://doaj.org/article/0e3c7f28845e46cab1995c64401057b7
Autor:
Jingwei Liu, Fulvio Melia
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 2, p 109 (2024)
Space-based missions studying the cosmic microwave background (CMB) have progressively refined the parameter space in conventional models of inflation shortly (∼10 ^−37 s) after the Big Bang. While most inflationary scenarios proposed thus far in
Externí odkaz:
https://doaj.org/article/719270e91e10436a95c9cf373ddf82d2
Autor:
Ali Ashrafzadeh, Kayoomars Karami
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 1, p 11 (2024)
In this study, we investigate the formation of primordial black holes (PBHs) in a scalar field inflationary model coupled to the Gauss–Bonnet term with fractional power-law potentials. The coupling function enhances the curvature perturbations, the
Externí odkaz:
https://doaj.org/article/818df5ab0a8e49829ccca36a43e8a435
Autor:
Sebastian Belkner, Julien Carron, Louis Legrand, Caterina Umiltà, Clem Pryke, Colin Bischoff, CMB-S4 Collaboration
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 2, p 148 (2024)
The tightest constraints on the tensor-to-scalar ratio r can only be obtained after removing a substantial fraction of the lensing B -mode sample variance. The planned Cosmic Microwave Background (CMB)-S4 experiment ( http://cmb-s4.org ) will remove
Externí odkaz:
https://doaj.org/article/1e63141638d34f8093f98120bbe80591