Results 91 to 100 of about 3,180,602 (301)
Observational effects from quantum cosmology [PDF]
, 2012 The status of quantum cosmologies as testable models of the early universe is assessed in the context of inflation. While traditional Wheeler–DeWitt quantization is unable to produce sizable effects in the cosmic microwave background, the more recent ...
G. Calcagni
semanticscholar +1 more source
Stellar Physics and General Relativity
Astronomische Nachrichten, EarlyView.ABSTRACT The general theory of relativity is currently established as the most precise theory of gravity supported by observations, and its application is diverse ranging from astronomy to cosmology, while its application to astrophysics has been restricted only to compact stars due to the assumption that the Newtonian approximation is sufficient for ...
Shuichi Yokoyama
wiley +1 more source
The ΛCDM-NG Cosmological Model: A Possible Resolution of the Hubble Tension
The Astrophysical JournalWe offer a cosmological model based on conventional general relativity (no speculative physics) that may resolve the Hubble tension. A reanalysis of the foundation of the Lambda-CDM model shows that general relativity alone does not specify what fraction
Richard J. Cook
doaj +1 more source
Exploring Dark Photon Production and Kinetic Mixing Constraints in Heavy‐Ion Collisions
Astronomische Nachrichten, EarlyView.ABSTRACT Vector U‐bosons, often referred to as “dark photons,” are potential candidates for mediating dark matter interactions. In this study, we outline a procedure to derive theoretical constraints on the upper bound of the kinetic mixing parameter ϵ2MU$$ {\upvarepsilon}^2\left({M}_U\right) $$ using dilepton data from heavy‐ion from SIS to RHIC ...
Adrian William Romero Jorge +3 more
wiley +1 more source
Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests [PDF]
, 2012 We review different dark energy cosmologies. In particular, we present the ΛCDM cosmology, Little Rip and Pseudo-Rip universes, the phantom and quintessence cosmologies with Type I, II, III and IV finite-time future singularities and non-singular dark ...
K. Bamba +3 more
semanticscholar +1 more source
Observational consequences of quantum cosmology [PDF]
Nuclear Physics B, 2007 12 pages, harvmac; refs.
openaire +2 more sources
Dark Energy From the Gravitational Wave Background With Scalar Field Dark Matter
Astronomische Nachrichten, EarlyView.ABSTRACT Recent observational results, such as those from pulsar timing arrays (PTA), suggest a low‐frequency Gravitational Wave Background (GWB) permeates our universe. This opens the possibility that gravitational waves could span a broader spectrum, potentially impacting cosmological scales.
Edwin L. Pérez‐Ochoa, Tonatiuh Matos
wiley +1 more source
HEROES: The Hawaii eROSITA Ecliptic Pole Survey Catalog
The Astrophysical Journal Supplement Series, 2023 We present a seven-band ( g , r , i , z , y , NB816, NB921) catalog derived from a Subaru Hyper Suprime-Cam (HSC) imaging survey of the North Ecliptic Pole (NEP).
A. J. Taylor +5 more
doaj +1 more source
Modelling baryonic feedback for survey cosmology [PDF]
The Open Journal of Astrophysics, 2019 Observational cosmology in the next decade will rely on probes of the distribution of matter in the redshift range between ...
N. E. Chisari +12 more
semanticscholar +1 more source
COSMOLOGICAL OBSERVATIONS AND BACKREACTION [PDF]
, 2014 Since the very beginning the Friedmann-Robertson-Walker metric has played one of the most important roles in developing cosmology. The underlying assumptions of maximal symmetry have simplified our general view of the Universe but recent developments in observational cosmology, like the discovery of cosmic acceleration, have demonstrated that a more ...
openaire +1 more source