Conveners
Cosmology 2
- Brooks Thomas (Lafayette College)
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Soubhik Kumar (UC Berkeley)19/05/2021, 16:00Cosmology
I will describe a scenario in which heavy particles are produced during inflation via their couplings to the inflaton. Following their production, these heavy particles propagate classically and can give rise to localized spots on the CMB. Momentum conservation during particle production dictates that these localized spots come in pairs. I will discuss the properties of such pairwise spots and...
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Nathan Musoke (University of New Hampshire)19/05/2021, 16:15Cosmology
Near-exponential growth during primordial inflation must eventually be followed by big bang nucleosynthesis. The reheating processes that occur in the transition between the two can affect the inflationary power spectrum and dark matter abundance. If the inflaton field is not disrupted by resonance or prompt reheating, perturbations growth gravitationally. I will present the first...
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Mr Yong Xu (Bethe Center for Theoretical Physics, Universität Bonn)19/05/2021, 16:30Cosmology
We revisit the renormalizable polynomial inflection point model of inflation, focusing on the small field scenario which can be treated fully analytically. In particular, the running of the spectral index is predicted to be $\alpha = -1.43 \times 10^{-3} +5.56 \times 10^{-5} \left(N_{\rm CMB}-65 \right)$, which might be tested in future. We also analyze reheating through perturbative inflaton...
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Qianshu Lu19/05/2021, 16:45Cosmology
In traditional models of preheating, only an order one fraction of energy is transferred from the inflaton to radiation through nonperturbative resonance production immediately after inflation, due to backreaction effects. We propose a particle production mechanism, "spillway preheating", that could improve the depletion of the inflaton energy density by up to four orders of magnitude. The...
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Matteo Lucca (IDP - ULB (Universite libre de Bruxelles))19/05/2021, 17:00Cosmology
Despite their incredible precision, both concluded and upcoming CMB missions (such as Planck, CMB-S4, or LiteBIRD) still face several intrinsic limitations that can only be overcome with the help of complementary probes. One particularly interesting avenue to extract more information from the CMB is given by its spectral distortions (SDs). Since these distortions are created whenever the...
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Nashwan Sabti19/05/2021, 17:15
UV luminosity functions (LF), measured with the Hubble Space Telescope, provide a wealth of information on the state of the early Universe. This probe tracks the evolution of the mass function of dark-matter halos at earlier times (z=4-10) and lower masses than the local Universe, an interesting regime to constrain the nature of dark matter and primordial fluctuations at small scales. In this...
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