Results 71 to 80 of about 180,985 (262)
Quantum Cosmology and the Evolution of Inflationary Spectra [PDF]
, 2016 We illustrate how it is possible to calculate the quantum gravitational effects on the spectra of primordial scalar/tensor perturbations starting from the canonical, Wheeler-De Witt, approach to quantum cosmology.
A. Kamenshchik, A. Tronconi, G. Venturi
semanticscholar +1 more source
Economic Anthropology, Volume 13, Issue 1, January 2026.ABSTRACT The khipu knotted string records in the ancient Andes were accounting systems, but they did not indicate any concepts of commensurability or exchange value. They were not incipient money; instead, monetized commerce appears to have predated the economic organization of the Inca society. The article begins by tracing the emergence of coinage in
Alf Hornborg
wiley +1 more source
Inflationary perturbations and precision cosmology [PDF]
Physical Review D, 2005 Inflationary cosmology provides a natural mechanism for the generation of primordial perturbations which seed the formation of observed cosmic structure and lead to specific signals of anisotropy in the cosmic microwave background radiation. In order to test the broad inflationary paradigm as well as particular models against precision observations, it
Habib, Salman +3 more
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Pulsar timing array observations as possible hints for nonsingular cosmology
European Physical Journal C: Particles and Fields, 2023 Recent pulsar timing array (PTA) experiments have reported strong evidence of the stochastic gravitational wave background (SGWB). If interpreted as primordial gravitational waves (GWs), the signal favors a strongly blue-tilted spectrum.
Mian Zhu, Gen Ye, Yong Cai
doaj +1 more source
Universe, 2023 Warm inflation has normalized two ideas in cosmology, that in the early universe the initial primordial density perturbations generally could be of classical rather than quantum origin and that during inflation, particle production from interactions ...
Arjun Berera
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Relic cosmological vector fields and inflationary gravitational waves [PDF]
, 2021 Avery J. Tishue, Robert R. Caldwell
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de Sitter Excited State in Heterotic E8×E8${\rm E}_8 \times {\rm E}_8$ Theory
Fortschritte der Physik, Volume 73, Issue 12, December 2025.Abstract A novel duality sequence is devised to study late‐time cosmology in the heterotic E8×E8${\rm E}_8 \times {\rm E}_8$ setup of Horava and Witten with dynamical walls that are moving towards each other. Remarkably, the dimensionally reduced 4‐dimensional theory does not violate NEC and no bouncing or ekpyrotic phase is observed.
Suddhasattwa Brahma +5 more
wiley +1 more source
Reheating in Inflationary Cosmology: Theory and Applications [PDF]
, 2010 Reheating is an important part of inflationary cosmology. It describes the production of Standard Model particles after the phase of accelerated expansion.
R. Allahverdi +3 more
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Expected value, to a point: Moral decision‐making under background uncertainty
Noûs, Volume 59, Issue 4, Page 1093-1125, December 2025.Abstract Expected value maximization gives plausible guidance for moral decision‐making under uncertainty in many situations. But it has unappetizing implications in ‘Pascalian’ situations involving tiny probabilities of extreme outcomes. This paper shows, first, that under realistic levels of ‘background uncertainty’ about sources of value independent
Christian Tarsney
wiley +1 more source
RECENT PROGRESS IN INFLATIONARY COSMOLOGY [PDF]
COSMO-97, 1998 We discuss two important modifications of inflationary paradigm. Until very recently we believed that inflation automatically leads to flatness of the universe, Omega = 1. We also thought that post-inflationary phase transitions in GUTs may occur only after thermalization, which made it very difficult to have baryogenesis in GUTs and to obtain ...
openaire +2 more sources