2018-01-22

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Speaker1: Eugeny Babichev (Laboratoire de Physique Théorique d'Orsay)
Title: Caustic free completion of k-essence
Abstract:
Both k-essence and the pressureless perfect fluid develop caustic
singularities at finite time. We explore the connection between the two
and show that they belong to the same class of models, which admits the
caustic free completion by means of the canonical complex scalar field.
Specifically, the free massive/self-interacting complex scalar
reproduces dynamics of pressureless perfect fluid/shift-symmetric
k-essence under certain initial conditions in the limit of large
mass/sharp self-interacting potential. We elucidate a mechanism of
resolving caustic singularities in the complete picture.

Speaker2: Eung Jin Chun (KIAS)
Title: Dark matter in Supersymmetric Axion Models
Abstract:
The strong CP problem is nicely resolved by the Peccei-Quinn mechanism which 
predicts a light pseudo-Goldstone boson, the axion. It is a dark matter 
candidate whose abundance is produced through the misalignment. In 
supersymmetric theories, the fermionic partner of the axion, the axino, 
is another dark matter candidate and can alter the standard features of a 
neutralino dark matter candidate.   In this talk, we discuss cosmological 
and phenomenological properties of the axion supermultiplet and its impact on 
the dark matter physics.  

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