Results 331 to 340 of about 556,485 (362)

Warm dark matter

AIP Conference Proceedings, 2016
The cold dark matter paradigm has been extremely successful in explaining the large-scale structure of the Universe. However, it continues to face issues when confronted by observations on sub-Galactic scales. A major caveat, now being addressed, has been the incomplete treatment of baryon physics.
openaire   +1 more source

Simulation-based inference on warm dark matter from HERA forecasts

Journal of Cosmology and Astroparticle Physics
The redshifted 21cm signal from Cosmic Dawn promises to open a new window into the early history of our universe and enable the probing of an unprecedented comoving survey volume. In this work, we revisit the imprint of Warm Dark Matter (WDM) on the 21cm
Quentin Decant, Androniki Dimitriou, L. Honorez, Bryan Zaldívar   +3 more
semanticscholar   +1 more source

Differentiating warm dark matter models through 21-cm line intensity mapping: A convolutional neural network approach

Physical Review D
We apply the convolutional neural networks (CNNs) to the mock 21cm maps from the post-reionization epoch to show that the $\Lambda$ cold dark matter and warm dark matter (WDM) model can be distinguished for WDM particle masses $m_{FD}
Koya Murakami, Kenji Kadota, Atsushi J. Nishizawa, K. Nagamine, I. Shimizu   +4 more
semanticscholar   +1 more source

Asymmetric warm dark matter: from cosmological asymmetry to chirality of life

Journal of Cosmology and Astroparticle Physics
We investigate a novel scenario involving asymmetric keV-range dark matter (DM) in the form of right-handed (sterile) neutrinos. Based on the Fermi-Dirac distribution, we demonstrate that asymmetric fermionic DM forms a Fermi degenerate gas, making it ...
Wen Yin, Shota Nakagawa, Tamaki Murokoshi, Makoto Hattori   +3 more
semanticscholar   +1 more source

Structure formation with warm white noise: Effects of finite number density and velocity dispersion in particle and wave dark matter

Journal of Cosmology and Astroparticle Physics
We investigate the evolution of density perturbations in dark matter, including the new combined effects of finite number density and non-zero velocity dispersion.
Mustafa A. Amin, M. Sten Delos, Mehrdad Mirbabayi   +2 more
semanticscholar   +1 more source

Early growth of structure in warm wave dark matter

Journal of Cosmology and Astroparticle Physics
We explore the growth of structure in wave-like dark matter models, where the field and density spectra are peaked at sub-horizon wavenumbers. Starting with the Schrödinger-Poisson system, we derive the scale-dependent evolution of the matter power ...
Mustafa A. Amin, S. May, Mehrdad Mirbabayi   +2 more
semanticscholar   +1 more source

Purely gravitational dark matter production in warm inflation

Physical Review D
We consider an appealing scenario for the production of purely gravitational dark matter in the background of warm inflation, a mechanism that maintains stable thermal bath during inflation.
Qing-Yang Wang, Tianyu Jia, Pei-Ran Chen, Yong Tang   +3 more
semanticscholar   +1 more source

Warm Dark Matter

2001
The Cold Dark Matter paradigm successfully explains many phenomena on scales larger than galaxies, but seems to predict galaxy halos which are more centrally concentrated and have a lumpier substructure than observed. Endowing cosmic dark matter with a small primordial velocity dispersion preserves the successful predictions of the Cold Dark Matter ...
openaire   +1 more source

A possible challenge for cold and warm dark matter

Nature Astronomy
Measuring the density profile and mass concentration of dark-matter haloes is a key test of the standard cold dark matter paradigm. Such objects are dark and thus challenging to characterize, but they can be studied via gravitational lensing. Recently,
S. Vegetti, S. D. M. White, J. P. McKean, D. M. Powell, C. Spingola, D. Massari, G. Despali, C. D. Fassnacht   +7 more
semanticscholar   +1 more source

Dark Matter Production during Warm Inflation via Freeze-In.

Physical Review Letters
We present a novel perspective on the role of inflation in the production of dark matter (DM). Specifically, we explore the DM production during warm inflation via ultraviolet freeze-in (WIFI).
Katherine Freese, Gabriele Montefalcone, Barmak Shams Es Haghi   +2 more
semanticscholar   +1 more source