Chen, Xingang

Permanent URI for this collectionhttps://hdl.handle.net/10735.1/4255

Xingang Chen was a Stephen Hawking Advanced Fellow in the Department of Applied Mathematics and Theoretical Physics while at the University of Cambridge. At UT Dallas he is currently an Assistant Professor of Physics. His research interests include:

  • Theoretical cosmology
  • Early-universe models
  • Primordial density perturbations
  • Cosmic microwave background and other large-scale structures
  • Dark matter
  • String cosmology

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Recent Submissions

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    Standard Clock in Primordial Density Perturbations and Cosmic Microwave Background
    (Elsevier B.V., 2014-11-05) Chen, Xingang; Namjoo, Mohammad Hossein
    Standard Clocks in the primordial epoch leave a special type of features in the primordial perturbations, which can be used to directly measure the scale factor of the primordial universe as a function of time a(t), thus discriminating between inflation and alternatives. We have started to search for such signals in the Planck 2013 data using the key predictions of the Standard Clock. In this Letter, we summarize the key predictions of the Standard Clock and present an interesting candidate example in Planck 2013 data. Motivated by this candidate, we construct and compute full Standard Clock models and use the more complete prediction to make more extensive comparison with data. Although this candidate is not yet statistically significant, we use it to illustrate how Standard Clocks appear in Cosmic Microwave Background (CMB) and how they can be further tested by future data. We also use it to motivate more detailed theoretical model building.

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