Results 21 to 30 of about 3,682 (109)

Radio Observations as a Probe of Cosmic Web Magnetism

Universe
The Universe’s magnetogenesis can be investigated with radio observations of cosmic filaments, where the information on the initial magnetic field seeds is expected to be preserved in time.
Ettore Carretti, Franco Vazza
doaj   +1 more source

Comparing Analytic and Numerical Studies of Tensor Perturbations in Loop Quantum Cosmology

Universe
We investigate the implications of different quantization approaches in Loop Quantum Cosmology for the primordial power spectrum of tensor modes. Specifically, we consider the hybrid and dressed metric approaches to derive the effective mass that governs
Guillermo A. Mena Marugán, Antonio Vicente-Becerril, Jesús Yébana Carrilero   +2 more
doaj   +1 more source

Dark Atoms of Nuclear Interacting Dark Matter

Universe
The lack of positive evidence for Weakly Interacting Massive Particles (WIMPs) as well as the lack of discovery of supersymmetric (SUSY) particles at the LHC may appeal to a non-supersymmetric solution for the Standard Model problem of the Higgs boson ...
Vitaly A. Beylin, Timur E. Bikbaev, Maxim Yu. Khlopov, Andrey G. Mayorov, Danila O. Sopin   +4 more
doaj   +1 more source

Primordial Axion Stars and Galaxy Halo Formation

Universe
Primordial axion stars, hypothetical stars formed from axions, could play an essential role in forming galaxy halos. These stars could have originated in the early universe shortly after the Big Bang. We show that the ultralight axions forming primordial
Alexander I. Nesterov
doaj   +1 more source

On the Classical Limit of Freely Falling Quantum Particles, Quantum Corrections and the Emergence of the Equivalence Principle

Universe
Quantum and classical mechanics are fundamentally different theories, but the correspondence principle states that quantum particles behave classically in the appropriate limit.
Juan A. Cañas, J. Bernal, A. Martín-Ruiz   +2 more
doaj   +1 more source

Non-Canonical Dark Energy Parameter Evolution in a Canonical Quintessence Cosmology

Universe
This study considers the specific case of a flat, minimally coupled to gravity, quintessence cosmology with a dark energy quartic polynomial potential that has the same mathematical form as the Higgs potential.
Rodger I. Thompson
doaj   +1 more source

Probing the Nonlinear Density Wave Theory of Spiral Galaxies by Baryonic Tully–Fisher Relation

Universe
The baryonic mass–velocity relation provides an important test of different galaxy dynamics models such as Lambda–cold dark matter (ΛCDM) and alternatives like Modified Newtonian Dynamics (MOND).
Miroslava Vukcevic, Djordje Savic, Predrag Jovanović   +2 more
doaj   +1 more source

Quantum Field Theory of Black Hole Perturbations with Backreaction: I General Framework

Universe
In a seminal work, Hawking showed that natural states for free quantum matter fields on classical spacetimes that solve the spherically symmetric vacuum Einstein equations are KMS states of non-vanishing temperature.
Thomas Thiemann
doaj   +1 more source

Three-Dimensional Quantum Black Holes: A Primer

Universe
We review constructions of three-dimensional ‘quantum’ black holes. Such spacetimes arise via holographic braneworlds and are exact solutions to an induced higher-derivative theory of gravity consistently coupled to a large-c quantum field theory with an
Emanuele Panella, Juan F. Pedraza, Andrew Svesko   +2 more
doaj   +1 more source

Modeling the TESS Light Curve of Ap Si Star MX TrA

Universe
The TESS light curve of the silicon Ap star MX TrA was modeled using the observational surface distribution of silicon, iron, helium, and chromium obtained previously with the Doppler Imaging technique.
Yury Pakhomov, Ilya Potravnov, Anna Romanovskaya, Tatiana Ryabchikova   +3 more
doaj   +1 more source