Results 121 to 130 of about 180,985 (262)

de Sitter symmetries and inflationary scalar-vector models

Universitas Scientiarum, 2016
In this paper, we study the correspondence between a field theory in de Sitter space in D-dimensions and a dual conformal field theory in a euclidean space in (D − 1)-dimensions.
Juan P. Beltrán Almeida, César A. Valenzuela-Toledo   +1 more
doaj   +1 more source

Geometrothermodynamic Cosmology. [PDF]

Entropy (Basel), 2023
Luongo O, Quevedo H.
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

Electromagnetic Conversion into Kinetic and Thermal Energies. [PDF]

Entropy (Basel), 2023
Brandenburg A, Protiti NN.
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

Large-Angle Anomalies in the CMB

Advances in Astronomy, 2010
We review the recently found large-scale anomalies in the maps of temperature anisotropies in the cosmic microwave background. These include alignments of the largest modes of CMB anisotropy with each other and with geometry and direction of motion of ...
Craig J. Copi, Dragan Huterer, Dominik J. Schwarz, Glenn D. Starkman   +3 more
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

Inflationary observables in loop quantum cosmology [PDF]

, 2011
Martin Bojowald, Gianluca Calcagni
openalex   +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