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Limits on scalar-induced gravitational waves from the stochastic background by pulsar timing array observations
Yi-Fu Cai, Xin-Chen He, Xiao-Han Ma +2
Recently, the NANOGrav, PPTA, EPTA, and CPTA collaborations independently reported their evidence of the Stochastic Gravitational Waves Background (SGWB). While the inferred gravit…
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…
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…
Emergent Universe and Genesis from the DHOST Cosmology
Amara Ilyas, Mian Zhu, Yunlong Zheng +1
In this article, we present an emergent universe scenario that can be derived from DHOST cosmology. The universe starts asymptotically Minkowski in the far past just like the regul…
Sound speed resonance of the stochastic gravitational wave background
Yi-Fu Cai, Chunshan Lin, Bo Wang +1
We propose a novel mechanism to test time variation of the propagation speed of gravitational waves (GWs) in light of GWs astronomy. As the stochastic GWs experience the whole hist…
Evading the theoretical no-go theorem for nonsingular bounces in Horndeski/Galileon cosmology
Shreya Banerjee, Yi-Fu Cai, Emmanuel N. Saridakis
We show that a nonsingular bounce, free of ghosts and gradient instabilities, can be realized in the framework of Horndeski or generalized Galileon cosmology. In particular, we fir…