106 citations · 446 across the 12 of their papers we have counts for
12 papers
Preinflationary perturbations from the closed algebra approach in loop quantum cosmology
Bao-Fei Li, Tao Zhu, Anzhong Wang +3
In this paper, the scalar and tensor perturbations in the closed algebra approach of loop quantum cosmology are studied. Instead of the distant past in the contracting phase, we ch…
Primordial non-Gaussianity and power asymmetry with quantum gravitational effects in loop quantum cosmology
Tao Zhu, Anzhong Wang, Klaus Kirsten +2
Loop quantum cosmology (LQC) provides a resolution of the classical big bang singularity in the deep Planck era. The evolution, prior to the usual slow-roll inflation, naturally ge…
Pre-inflationary universe in loop quantum cosmology
Tao Zhu, Anzhong Wang, Gerald Cleaver +2
The evolutions of the flat FLRW universe and its linear perturbations are studied systematically in the dressed metric approach of LQC. When it is dominated by the kinetic energy o…
Universal features of quantum bounce in loop quantum cosmology
Tao Zhu, Anzhong Wang, Klaus Kirsten +2
In this Letter, we study analytically the evolutions of the flat Friedmann-Lemaitre-Robertson-Walker (FLRW) universe and its linear perturbations in the framework of {\em the dress…
High-order Primordial Perturbations with Quantum Gravitational Effects
Tao Zhu, Anzhong Wang, Klaus Kirsten +2
In this paper, we provide a systematic investigation of high-order primordial perturbations with nonlinear dispersion relations due to quantum gravitational effects in the framewor…
Inflationary spectra with inverse-volume corrections in loop quantum cosmology and their observational constraints from Planck 2015 data
Tao Zhu, Anzhong Wang, Klaus Kirsten +3
We first derive the primordial power spectra, spectral indices and runnings of both scalar and tensor perturbations of a flat inflationary universe to the second-order approximatio…
Scalar and tensor perturbations in loop quantum cosmology: High-order corrections
Tao Zhu, Anzhong Wang, Gerald Cleaver +3
Loop quantum cosmology (LQC) provides promising resolutions to the trans-Planckian issue and initial singularity arising in the inflationary models of general relativity. In genera…
Detecting quantum gravitational effects of loop quantum cosmology in the early universe?
Tao Zhu, Anzhong Wang, Gerald Cleaver +3
We derive the primordial power spectra and spectral indexes of the density fluctuations and gravitational waves in the framework of loop quantum cosmology (LQC) with holonomy and i…
Power spectra and spectral indices of -inflation: high-order corrections
Tao Zhu, Anzhong Wang, Gerald Cleaver +2
-inflation represents the most general single-field inflation, in which the perturbations usually obey an equation of motion with a time-dependent sound speed. In this paper, we…
Gravitational quantum effects on power spectra and spectral indices with higher-order corrections
Tao Zhu, Anzhong Wang, Gerald Cleaver +2
The uniform asymptotic approximation method provides a powerful, systematically-improved, and error-controlled approach to construct accurate analytical approximate solutions of mo…
Inflationary cosmology with nonlinear dispersion relations
Tao Zhu, Anzhong Wang, Gerald Cleaver +2
We present a technique, {\em the uniform asymptotic approximation}, to construct accurate analytical solutions of the linear perturbations of inflation after quantum effects of the…
Constructing analytical solutions of linear perturbations of inflation with modified dispersion relations
Tao Zhu, Anzhong Wang, Gerald Cleaver +2
We develop a technique to construct analytical solutions of the linear perturbations of inflation with a nonlinear dispersion relation, due to quantum effects of the early universe…