299 citations · 949 across the 21 of their papers we have counts for
22 papers
A short review on Quintom dark energy theory
Xin Ren, Si-Yu Li, Yang Liu +3
In this paper, we provide a short review on the Quintom dark energy theory. Firstly, we discuss the No-Go theorem associated with dynamical dark energy, then present some examples…
Decoupling perturbations from background in gravity: the square-root correction and the impact on the tension
Chunyu Li, Xin Ren, Yuhang Yang +2
We investigate a perturbation-level modification of symmetric teleparallel gravity of the form and assess its potential to ease the tension. The square-…
Probing the sound speed and clustering of dark energy
Yuhang Yang, Qingqing Wang, Xin Ren +2
Recent Dark Energy Spectroscopic Instrument (DESI) observations favor a dynamical dark energy component with a time-varying equation-of-state, potentially crossing the cosmological…
The Quintom theory of dark energy after DESI DR2
Yifu Cai, Xin Ren, Taotao Qiu +2
Observations from DESI DR2 are challenging the CDM paradigm by suggesting that the equation-of-state parameter of dark energy evolves across , a phenomenon known as the…
Modified gravity realizations of quintom dark energy after DESI DR2
Yuhang Yang, Qingqing Wang, Xin Ren +2
We investigate the realization of quintom scenario for dynamical dark energy within modified gravity theories that can efficiently fit the recent observational datasets. Starting f…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Gaussian-process reconstructions and model building of quintom dark energy from latest cosmological observations
Yuhang Yang, Qingqing Wang, Chunyu Li +4
In this article we use the latest cosmological observations, including SNe, BAO, CC and RSD, to reconstruct the cosmological evolution via the Gaussian process. At the background l…
Background-dependent and classical correspondences between and gravity
Cheng Wu, Xin Ren, Yuhang Yang +2
and gravity are based on fundamentally different geometric frameworks, yet they exhibit many similar properties. This article provides a comprehensive summary and com…
Observational test for gravity with weak gravitational lensing
Qingqing Wang, Xin Ren, Yi-Fu Cai +2
In this article we confront a class of gravity models with observational data of galaxy-galaxy lensing. Specifically, we consider the gravity models containing a smal…
Quintom cosmology and modified gravity after DESI 2024
Yuhang Yang, Xin Ren, Qingqing Wang +4
We reconstruct the cosmological background evolution under the scenario of dynamical dark energy through the Gaussian process approach, using the latest Dark Energy Spectroscopic I…
Data reconstruction of the dynamical connection function in cosmology
Yuhang Yang, Xin Ren, Bo Wang +2
We employ Hubble data and Gaussian Processes in order to reconstruct the dynamical connection function in cosmology beyond the coincident gauge. In particular, there exist t…
Exploring Gravity via strongly lensed fast radio bursts
Xinyue Jiang, Xin Ren, Zhao Li +2
This study aims to investigate the strong gravitational lensing effects in gravity. We present the theoretical analytic expressions for the lensing effects in gravity…
Galaxy-galaxy lensing data: gravity challenges General Relativity
Qingqing Wang, Xin Ren, Bo Wang +3
We use galaxy-galaxy lensing data to test General Relativity and gravity at galaxies scales. We consider an exact spherically symmetric solution of theory which is ob…
The effective field theory approach to the strong coupling issue in gravity
Yu-Min Hu, Yaqi Zhao, Xin Ren +3
We investigate the scalar perturbations and the possible strong coupling issues of around a cosmological background, applying the effective field theory (EFT) approach. We r…
Stochastic gravitational wave background from the collisions of dark matter halos
Qiming Yan, Xin Ren, Yaqi Zhao +1
We investigate the effect of the dark matter (DM) halos collisions, namely collisions of galaxies and galaxy clusters, through gravitational bremsstrahlung, on the stochastic gravi…
N-body simulations, halo mass functions, and halo density profile in gravity
Yiqi Huang, Jiajun Zhang, Xin Ren +2
We perform N-body simulations for gravity using the ME-Gadget code, in order to investigate for the first time the structure formation process in detail. Focusing on the pow…
Quasinormal modes of black holes in f(T) gravity
Yaqi Zhao, Xin Ren, Amara Ilyas +2
We calculate the quasinormal modes (QNM) frequencies of a test massless scalar field and an electromagnetic field around static black holes in gravity. Focusing on quadratic…
Gaussian processes and effective field theory of gravity under the tension
Xin Ren, Sheng-Feng Yan, Yaqi Zhao +2
We consider the effective field theory formulation of torsional gravity in a cosmological framework to alter the background evolution. Then we use the latest measurement from…
Deflection angle and lensing signature of covariant f(T) gravity
Xin Ren, Yaqi Zhao, Emmanuel N. Saridakis +1
We calculate the deflection angle, as well as the positions and magnifications of the lensed images, in the case of covariant gravity. We first extract the spherically symme…
Data-driven Reconstruction of the Late-time Cosmic Acceleration with f(T) Gravity
Xin Ren, Thomas Hong Tsun Wong, Yi-Fu Cai +1
We use a combination of observational data in order to reconstruct the free function of f(T) gravity in a model-independent manner. Starting from the data-driven determined dark-en…
Testing the equivalence principle via the shadow of black holes
Chunlong Li, Sheng-Feng Yan, Lingqin Xue +5
We study the equivalence principle, regarded as the cornerstone of general relativity, by analyzing the deformation observable of black hole shadows. Such deformation can arise fro…
Implications of the possible 21-cm line excess at cosmic dawn on dynamics of interacting dark energy
Chunlong Li, Xin Ren, Martiros Khurshudyan +1
In this paper we study implications of the possible excess of 21-cm line global signal at the epoch of cosmic dawn on the evolutions of a class of dynamically interacting dark ener…