My research interests focus on early universe cosmology, primordial black holes (PBHs), scalar-induced gravitational waves (SIGWs), primordial non-Gaussianity, and the quantum dynamics of cosmological perturbations and gravity. I am particularly interested in exploring physics beyond the standard slow-roll inflationary paradigm and understanding how non-linear and non-perturbative effects in the early universe can produce observable signatures.

Recently, my work has mainly focused on the formation of primordial black holes and the generation of induced gravitational waves in inflationary models with transient non-slow-roll phases. I study how non-Gaussian statistics and non-linear gravitational dynamics modify the connection between primordial fluctuations, PBHs, and gravitational wave signals.

More broadly, I am interested in theoretical approaches to strongly non-linear gravitational systems in cosmology, including stochastic inflation, cosmological perturbation theory, and gradient expansion methods. I am also interested in connecting these theoretical developments with current and future observations. My long-term goal is to better understand the quantum and non-linear nature of gravity in the early universe and its observational consequences.

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  xiaohan.ma@apctp.org

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  514

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  Astrophysics / Cosmology

  Astrophysics / Cosmology