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Scalar and Tensor Perturbations in DHOST Bounce Cosmology
Mian Zhu, Amara Ilyas, Yunlong Zheng +2
We investigate the bounce realization in the framework of DHOST cosmology, focusing on the relation with observables. We perform a detailed analysis of the scalar and tensor pertur…
Beating the Lyth bound by parametric resonance during inflation
Yi-Fu Cai, Jie Jiang, Misao Sasaki +2
We propose a novel mechanism for enhancing the primordial gravitational waves without significantly affecting the curvature perturbations produced during inflation. This is achieve…
Ultrahigh-energy Gamma Rays and Gravitational Waves from Primordial Exotic Stellar Bubbles
Yi-Fu Cai, Chao Chen, Qianhang Ding +1
We put forward a novel class of exotic celestial objects that can be produced through phase transitions occurred in the primordial Universe. These objects appear as bubbles of stel…
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…
New test on the Einstein equivalence principle through the photon ring of black holes
Chunlong Li, Hongsheng Zhao, Yi-Fu Cai
Einstein equivalence principle (EEP), as one of the foundations of general relativity, is a fundamental test of gravity theories. In this paper, we propose a new method to test the…