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- National Radio Astronomy ObservatoryUS83 papers
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8 papers · 1 filter
Evaluating Lyman- Constraints for General Dark-Matter Velocity Distributions: Multiple Scales and Cautionary Tales
Keith R. Dienes, Fei Huang, Jeff Kost +2
The Lyman- absorption spectrum associated with photons traversing the intergalactic medium allows us to probe the linear matter power spectrum down to relatively small distance…
Stasis in an Expanding Universe: A Recipe for Stable Mixed-Component Cosmological Eras
Keith R. Dienes, Lucien Heurtier, Fei Huang +3
One signature of an expanding universe is the time-variation of the cosmological abundances of its different components. For example, a radiation-dominated universe inevitably give…
Searching For Gravitational Waves From Cosmological Phase Transitions With The NANOGrav 12.5-year dataset
Zaven Arzoumanian, Paul T. Baker, Harsha Blumer +62
We search for a first-order phase transition gravitational wave signal in 45 pulsars from the NANOGrav 12.5 year dataset. We find that the data can be modeled in terms of a strong…
Deciphering the Archaeological Record: Cosmological Imprints of Non-Minimal Dark Sectors
Keith R. Dienes, Fei Huang, Jeff Kost +2
Many proposals for physics beyond the Standard Model give rise to a dark sector containing many degrees of freedom. In this work, we explore the cosmological implications of the no…
Constraining Dark-Matter Ensembles with Supernova Data
Aditi Desai, Keith R. Dienes, Brooks Thomas
The constraints on non-minimal dark sectors involving ensembles of unstable dark-matter species are well established and quite stringent in cases in which these species decay to vi…
Limits on the Stochastic Gravitational Wave Background from the North American Nanohertz Observatory for Gravitational Waves
P. B. Demorest, R. D. Ferdman, M. E. Gonzalez +24
We present an analysis of high-precision pulsar timing data taken as part of the North American Nanohertz Observatory for Gravitational waves (NANOGrav) project. We have observed 1…