3. ΜΕΛΑΝΕΣ ΟΠΕΣ ΚΑΙ ΤΙΣ ΤΡΟΠΟΠΟΙΗΜΕΝΕΣ ΘΕΩΡΙΕΣ ΒΑΡΥΤ…
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Διάλεξη

Μελανές οπές και τις τροποποιημένες θεωρίες βαρύτητας

27 Φεβ 2018
Χρήστος Χαρμούσης
Διευθυντής ερευνών του Laboratoire de Physique Theorique d'Orsay

Η δεύτερη δίωρη διάλεξη του διευθυντή ερευνών του Laboratoire de Physique Theorique d'Orsay κ. Χρήστου Χαρμούση (στα πλαίσια του Ευρωπαϊκού προγράμματος COST "GWverse") θα πραγματοποιηθεί ως εξής: 

Τρίτη 27 Φεβρουαρίου 2018, ώρα 13:00-15:00, στο Αστεροσκοπείο

1η ώρα: Black holes and no hair theorems (part IΙ)

We will review within Horndeski theories a no hair theorem. We will see how breaking the hypothesis of this theorem we can produce hairy black hole solutions and their characteristics. We will study the issue of primary and secondary hair and give example solutions. We will focus on particular scalar tensor theories and show how time dependence can cure the no hair paradigm providing regular solutions with a dark energy scalar field. We will see how certain black hole solutions have self-tuning properties which can give an alternative understanding of dark energy.

2η ώρα: Gravitational wave observations and constraints on scalar tensor theories

We will examine novel constraints due to the observations of neutron star binaries and how they constrain scalar tensor theories. We will show how previous solutions found can be transformed to solutions which are observationally acceptable and the current status of scalar tensor theories. We will comment on the stability of certain hairy black holes and discuss open problems regarding neutron stars the issue of rotating solutions and the coupling to matter.
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