KIAS HEP-PH Journal Club meeting

by Dr Dibyendu Nanda (KIAS)

Friday 6 May 2022, 11:00 → 13:00 Asia/Seoul

Online(KIAS) (Online)

=============== journal club meeting ===============

Date: Friday 6th May 2022 11:00-12:00 (KST)

Place: online (zoom)

Join Zoom : https://us02web.zoom.us/j/81909682441?pwd=SHRYenRZN2Zwd0tLdjdJc2dtb3FRQT09

Meeting ID : 81909682441

Passcode : 63798375

- Talk Information

Talk1 :

Speaker : Dr. Dibyendu Nanda

Title : CMB pathway to testable non-thermal leptogenesis

Abstract : 

 I will discuss an interesting clue to probe high scale non-thermal leptogenesis from the measurement of spectral index ($n_s$) and tensor to scalar ratio ($r$) by cosmic microwave background experiments which is otherwise inaccessible to the conventional laboratory experiments. We argue that non-thermal production of baryon (lepton) asymmetry from tree level inflaton decay is sensitive to the reheating dynamics of the Universe after the end of inflation. Such dependence provides detectable imprint on the $n_s-r$ plane which is well constrained by the Planck experiment. We investigate two separate cases, (i) inflaton decays to radiation dominantly and (ii) inflaton does not decay to radiation at tree level. We obtain the corresponding estimates for $n_s$ and $r$ and find the later case to be more predictive in view of recent Planck/BICEP data.

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