111 citations · 626 across the 29 of their papers we have counts for
29 papers
The Dynamics of Reheating in Loop Quantum Cosmology
Yogesh, Bao-Fei Li, Mayukh R. Gangopadhyay +1
In loop quantum cosmology (LQC), the initial singularity is replaced by a quantum bounce, leading to a universal post-bounce evolution characterized by three distinct epochs: bounc…
Constraining regularization ambiguities in Loop Quantum Cosmology via CMB
Bao-Fei Li, Meysam Motaharfar, Parampreet Singh
In order to investigate the potential observational signals of different regularization ambiguities in loop quantum cosmological models, we systematically compute and compare the p…
Alternative effective mass functions in the modified Mukhanov-Sasaki equation of loop quantum cosmology
Bao-Fei Li, Parampreet Singh
Modifications to the Mukhanov-Sasaki equation in loop quantum cosmology (LQC) have been phenomenologically explored using polymerization of the connection and related variables in…
Loop Quantum Cosmology: Physics of Singularity Resolution and its Implications
Bao-Fei Li, Parampreet Singh
The occurrence of singularities where spacetime curvature becomes infinite and geodesic evolution breaks down are inevitable events in classical general relativity (GR) unless one…
Spherical symmetric gravitational collapse of a dust cloud: polymerized dynamics in reduced phase space
Kristina Giesel, Muxin Han, Bao-Fei Li +2
Based on the effective dynamics in the scheme of the spherical symmetry reduced model in the reduced phase space formulation of loop quantum gravity (LQG), we investigate…
On a close relationship between the dressed metric and the hybrid approach to perturbations in effective loop quantum cosmology
Bao-Fei Li, Parampreet Singh
The dressed metric and the hybrid approach to perturbations are the two main approaches to capture the effects of quantum geometry in the primordial power spectrum in loop quantum…
Loop quantum cosmology and its gauge-covariant avatar: a weak curvature relationship
Bao-Fei Li, Parampreet Singh
We explore the relationship between the effective dynamics in standard loop quantum cosmology (LQC) based on holonomies and triads obtained from gauge-fixing fluxes, and a modifica…
On consistent gauge fixing conditions in polymerized gravitational systems
Kristina Giesel, Bao-Fei Li, Parampreet Singh +1
For classical gravitational systems the lapse function and the shift vector are usually determined by imposing appropriate gauge fixing conditions and then demanding their preserva…
Does loop quantum scheme permit a black hole formation?
Bao-Fei Li, Parampreet Singh
We explore the way different loop quantization prescriptions affect the formation of trapped surfaces in the gravitational collapse of a homogeneous dust cloud, with a particular e…
Quantum gravity might restrict a cyclic evolution
Bao-Fei Li, Parampreet Singh
It is generally expected that in a non-singular cosmological model a cyclic evolution is straightforward to obtain on introduction of a suitable choice of a scalar field with a neg…
Non-singular quantum gravitational dynamics of an LTB dust shell model: the role of quantization prescriptions
Kristina Giesel, Bao-Fei Li, Parampreet Singh
We study some consequences of the loop quantization of the outermost dust shell in the Lemaître-Tolman-Bondi spacetime with a homogeneous dust density using different quantization…
Phenomenological implications of modified loop cosmologies: an overview
Bao-Fei Li, Parampreet Singh, Anzhong Wang
In this paper, we first provide a brief review of the effective dynamics of two recently well-studied models of modified loop quantum cosmologies (mLQCs), which arise from differen…
Primordial power spectrum from a matter-Ekpyrotic bounce scenario in loop quantum cosmology
Bao-Fei Li, Sahil Saini, Parampreet Singh
A union of matter bounce and Ekpyrotic scenarios is often studied in an attempt to combine the most promising features of these two models. Since non-perturbative quantum geometric…
Relating dust reference models to conventional systems in manifestly gauge invariant perturbation theory
Kristina Giesel, Bao-Fei Li, Parampreet Singh
Models with dust reference fields in relational formalism have proved useful in understanding the construction of gauge-invariant perturbation theory to arbitrary orders in the can…
Quantum gravitational onset of Starobinsky inflation in a closed universe
Lucia Gordon, Bao-Fei Li, Parampreet Singh
Recent cosmic microwave background observations favor low energy scale inflationary models in a closed universe. However, onset of inflation in such models for a closed universe is…
Primordial scalar power spectrum from the hybrid approach in loop cosmologies
Bao-Fei Li, Javier Olmedo, Parampreet Singh +1
We compare the primordial scalar power spectra in the loop cosmological models using the effective dynamics of the hybrid approach to cosmological perturbations in which the backgr…
Towards a reduced phase space quantization in loop quantum cosmology with an inflationary potential
Kristina Giesel, Bao-Fei Li, Parampreet Singh
We explore a reduced phase space quantization of loop quantum cosmology (LQC) for a spatially flat FLRW universe filled with reference fields and an inflaton field in a Starobinsky…
Mukhanov-Sasaki equation in manifestly gauge-invariant linearized cosmological perturbation theory with dust reference fields
Kristina Giesel, Laura Herold, Bao-Fei Li +1
The aim of this article is to understand the role of dust reference fields, often also called clocks, on cosmological perturbations around a flat FLRW universe. We derive the Mukha…
Primordial power spectrum from the dressed metric approach in loop cosmologies
Bao-Fei Li, Parampreet Singh, Anzhong Wang
We investigate the consequences of different regularizations and ambiguities in loop cosmological models on the predictions in the scalar and tensor primordial spectrum of the cosm…
Genericness of pre-inflationary dynamics and probability of the desired slow-roll inflation in modified loop quantum cosmologies
Bao-Fei Li, Parampreet Singh, Anzhong Wang
We study the evolution of spatially flat Friedmann-Lemaître-Robertson-Walker universe for chaotic and Starobinsky potentials in the framework of modified loop quantum cosmologies.…
Langer Modification, Quantization condition and Barrier Penetration in Quantum Mechanics
Bao-Fei Li, Tao Zhu, Anzhong Wang
The WKB approximation plays an essential role in the development of quantum mechanics and various important results have been obtained from it. In this paper, we introduce another…
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…
Qualitative dynamics and inflationary attractors in loop cosmology
Bao-Fei Li, Parampreet Singh, Anzhong Wang
Qualitative dynamics of three different loop quantizations of spatially flat isotropic and homogeneous models is studied using effective spacetime description of the underlying qua…
Towards Cosmological Dynamics from Loop Quantum Gravity
Bao-Fei Li, Parampreet Singh, Anzhong Wang
We present a systematic study of the cosmological dynamics resulting from an effective Hamiltonian, recently derived in loop quantum gravity using Thiemann's regularization and ear…