622 citations · 3.9k across the 103 of their papers we have counts for
5 papers · 1 filter
Large N Cosmology
Robert Brandenberger, Pei-Ming Ho, Hsien-chung Kao
We motivate inflationary scenarios with many scalar fields, and give a complete formulation of adiabatic and entropy perturbations. We find that if the potential is very flat, or i…
Regularization of Newton Constant, Trans-Planckian Dispersion Relation, and Symmetry of Particle Spectrum
Pei-Ming Ho
We consider the possibility that the UV completeness of a fundamental theory is achieved by a modification of propagators at large momenta. We assume that general covariance is pre…
Hyperbolic Space Cosmologies
Chiang-Mei Chen, Pei-Ming Ho, Ishwaree P. Neupane +2
We present a systematic study of accelerating cosmologies obtained from M/string theory compactifications of hyperbolic spaces with time-varying volume. A set of vacuum solutions w…
A Note on Acceleration from Product Space Compactification
Chiang-Mei Chen, Pei-Ming Ho, Ishwaree P. Neupane +1
We study compactifications of Einstein gravity on product spaces in vacuum and their acceleration phases. Scalar potentials for the dimensionally reduced effective theory are found…
Time Evolution via S-branes
Koji Hashimoto, Pei-Ming Ho, Satoshi Nagaoka +1
Using S(pacelike)-branes defined through rolling tachyon solutions, we show how the dynamical formation of D(irichlet)-branes and strings in tachyon condensation can be understood.…