851 citations · 5.2k across the 133 of their papers we have counts for
8 papers · 1 filter
Cosmological Avatars of the Landscape II: CMB and LSS Signatures
R. Holman, Laura Mersini-Houghton, Tomo Takahashi
This is the second paper in the series that confronts predictions of a model of the landscape with cosmological observations. We show here how the modifications of the Friedmann eq…
Dark Energy Parametrizations and the Curvature of the Universe
Kazuhide Ichikawa, Tomo Takahashi
We investigate observational constraints on the curvature of the universe not restricting ourselves to a cosmological constant as dark energy, in particular allowing a dark energy…
Cosmological Avatars of the Landscape I: Bracketing the SUSY Breaking Scale
R. Holman, L. Mersini-Houghton, Tomo Takahashi
We investigate the effects of quantum entanglement between our horizon patch and others due to the tracing out of long wavelength modes in the wavefunction of the Universe as defin…
Effects of Cosmic Strings on Free Streaming
Tomo Takahashi, Masahide Yamaguchi
We study the effect of free streaming in a universe with cosmic strings with time-varying tension as well as with constant tension. Although current cosmological observations sugge…
Constraining SuperWIMPy and Warm Subhalos with Future Submillilensing
Junji Hisano, Kaiki Taro Inoue, Tomo Takahashi
We propose to observe QSO-galaxy strong lens systems to give a new constraint on the damping scale of the initial fluctuations. We find that the future observation of submilliarc s…
Implications of cosmic strings with time-varying tension on CMB and large scale structure
Kazuhide Ichikawa, Tomo Takahashi, Masahide Yamaguchi
We investigate cosmological evolution and implications of cosmic strings with time-dependent tension. We derive basic equations of time development of the correlation length and th…