Journal
PHYSICAL REVIEW D
Volume 84, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.84.123503
Keywords
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Funding
- Yukawa Institute for Theoretical Physics, Kyoto University
- Asia Pacific Center for Theoretical Physics
- World Class University through the National Research Foundation, Ministry of Education, Science and Technology of Korea [R32-10130]
- Taiwan NSC [NSC97-2112-M-002-026-MY3]
- Taiwan's National Center for Theoretical Sciences (NCTS)
- JSPS [21244033, 19GS0219]
- MEXT
- Korea Institute for Advanced Study
- Grants-in-Aid for Scientific Research [10F00775, 21244033] Funding Source: KAKEN
- National Research Foundation of Korea [52314001] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We study an inflationary model driven by a single minimally coupled standard kinetic term scalar field with a step in its mass modeled by an Heaviside step function. We present an analytical approximation for the mode function of the curvature perturbation, obtain the power spectrum analytically and compare it with the numerical result. We show that, after the scale set by the step, the spectrum contains damped oscillations that are well described by our analytical approximation. We also compute the dominant contribution to the bispectrum in the equilateral and the squeezed limits and find new shapes. In the equilateral and squeezed limits the bispectrum oscillates and it has a linear growth envelope towards smaller scales. The bispectrum size can be large depending on the model parameters.
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