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8 papers · 2 filters
Evolution of perturbation and power spectrum in a two-component ultralight axionic universe
Yi-Hsiung Hsu, Tzihong Chiueh
The evolution of cosmic perturbations in a two-component ultralight axionic universe is investigated. We present the first spectral computation of perturbations in multi-component…
Primordial black holes and gravitational waves from resonant amplification during inflation
Zihan Zhou, Jie Jiang, Yi-Fu Cai +2
We present a new realization of the resonant production of primordial black holes as well as gravitational waves in a two-stage inflation model consisting of a scalar field ϕwith a…
Testing Stochastic Gravitational Wave Signals from Primordial Black Holes with Optical Telescopes
Sunao Sugiyama, Volodymyr Takhistov, Edoardo Vitagliano +3
Primordial black holes (PBHs) can constitute the predominant fraction of dark matter (DM) if PBHs reside in the currently unconstrained "sublunar" mass range. PBHs originating from…
On Problems with Cosmography in Cosmic Dark Ages
Aritra Banerjee, Eoin Ó Colgáin, Misao Sasaki +2
Quasars show considerable promise as standard candles in a high-redshift window beyond Type Ia supernovae. Recently, Risaliti, Lusso \& collaborators \cite{Risaliti:2018reu, Lusso:…
Multi-field dark energy: cosmic acceleration on a steep potential
Yashar Akrami, Misao Sasaki, Adam R. Solomon +1
We argue that dark energy with multiple fields is theoretically well-motivated and predicts distinct observational signatures, in particular when cosmic acceleration takes place al…
New measures to test modified gravity cosmologies
Jiro Matsumoto, Teppei Okumura, Misao Sasaki
The observed accelerated expansion of the Universe may be explained by dark energy or the breakdown of general relativity (GR) on cosmological scales. When the latter case, a modif…