Results 121 to 130 of about 2,808 (218)

Electromagnetic Conversion into Kinetic and Thermal Energies. [PDF]

Entropy (Basel), 2023
Brandenburg A, Protiti NN.
europepmc   +1 more source

Inflationary models with Gauss–Bonnet coupling in light of ACT observations

European Physical Journal C: Particles and Fields
Recent analyses combining Atacama Cosmology Telescope (ACT) data with other cosmological datasets report a higher scalar spectral index $$n_s$$ n s , creating tension with a wide range of inflationary models.
Yigan Zhu, Qing Gao, Yungui Gong, Zhu Yi
doaj   +1 more source

100 years of mathematical cosmology: Models, theories and problems, Part B. [PDF]

Philos Trans A Math Phys Eng Sci, 2022
Cotsakis S, Yefremov AP.
europepmc   +1 more source

Cosmology

, 2015
In these lectures I review the present status of the so-called Standard Cosmological Model, based on the hot Big Bang Theory and the Inflationary Paradigm.
García-Bellido, J., García-Bellido, J
core   +1 more source

Unitarity problems for an effective field theory description of early universe cosmology. [PDF]

Eur Phys J C Part Fields, 2022
Brandenberger R, Kamali V.
europepmc   +1 more source

Inflation based on the Tsallis entropy

European Physical Journal C: Particles and Fields
We study the inflationary scenario in the Tsallis entropy-based cosmology. The Friedmann equations in this setup can be derived by using the first law of thermodynamics.
Zeinab Teimoori, Kazem Rezazadeh, Abasat Rostami   +2 more
doaj   +1 more source

Is Planckian Discreteness Observable in Cosmology?

Universe
A Planck scale inflationary era—in a quantum gravity theory predicting discreteness of quantum geometry at the fundamental scale—produces the scale-invariant spectrum of inhomogeneities with a very small tensor-to-scalar ratio of perturbations and a hot ...
Gabriel R. Bengochea, Gabriel León, Alejandro Perez   +2 more
doaj   +1 more source

Consistency of tachyacoustic cosmology with de Sitter swampland conjectures

, 2019
Recent studies show that there is tension between the de Sitter swampland conjectures proposed by Obeid, et al. and inflationary cosmology. In this paper, we consider an alternative to inflation, tachyacoustic cosmology, in light of swampland conjectures.
Lin, Wei-Chen, Kinney, William H.,
core   +1 more source

Inflationary alpha-attractor cosmology : A global dynamical systems perspective

, 2017
We study flat Friedmann-Lemaitre-Robertson-Walker alpha-attractor E- and T-models by introducing a dynamical systems framework that yields regularized unconstrained field equations on two-dimensional compact state spaces.
Claes Uggla, Uggla, Claes,, Uggla, Claes, Alho, Artur, Artur Alho, Alho, Artur,   +5 more
core   +1 more source

Proposed physical mechanism that gives rise to cosmic inflation. [PDF]

Sci Rep, 2023
Law BM.
europepmc   +1 more source