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Imprints of Massive Scalars on Primordial Non-Gaussianities


Ridgway, Alexander Karas (2019) Imprints of Massive Scalars on Primordial Non-Gaussianities. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/0FD0-GY68.


In this thesis, we modify the standard single-field inflation scenario by adding additional massive scalars to the inflationary field content. Due to the breaking of time translational invariance by the inflaton background, the inflaton can interact with these extra scalars through a kinetic mixing term. If these scalars have self- interactions, then their kinetic mixings with the inflaton induce potentially large primordial non-gaussianities in the scalar curvature fluctuations, which could be observed in the cosmic microwave background (CMB) and large-scale structure (LSS). We derive expressions for these non-Gaussianities in the limits the scalar masses are much larger than or much smaller than the Hubble constant during inflation and compute their contributions to dark matter halo correlation functions.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Inflation
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Awards:France A. Córdova Graduate Student Fund, 2018.
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Wise, Mark B.
Thesis Committee:
  • Cheung, Clifford W. (chair)
  • Doré, Olivier P.
  • Kapustin, Anton N.
  • Wise, Mark B.
Defense Date:24 May 2019
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0011632
Record Number:CaltechTHESIS:06112019-185424559
Persistent URL:
Related URLs:
URLURL TypeDescription adapted for Chapter 5. adapted for Chapter 4. adapted for Chapter 3. adapted for Chapter 2.
Ridgway, Alexander Karas0000-0002-2592-1848
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11738
Deposited By: Alexander Ridgway
Deposited On:14 Jun 2019 16:19
Last Modified:26 Oct 2021 17:01

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