Στα πλαίσια του Ευρωπαϊκού προγράμματος COST "GWverse", ο διευθυντής ερευνών του
Laboratoire de Physique Theorique d'Orsay κ.
Χρήστος Χαρμούσης θα δώσει δύο δίωρες ειδικές διαλέξεις (για φοιτητές) με θέμα τις
μελανές οπές και τις τροποποιημένες θεωρίες βαρύτητας.
Τετάρτη 21 Φεβρουαρίου 2018, ώρα 13:00-15:00, στο Αστεροσκοπείο
1η ώρα: Modification of gravity: an introduction
We
will review the theoretical and observational status of General
Relativity and ways and reasons to modify Einstein s theory of
relativity at large distances. We will review the cosmological constant
problem and the question and nature of dark energy. We will then proceed
to enlist different modifications of gravity and their main
characteristics. We will then focus our attention to scalar tensor
theories of gravity and will classify them. We will discuss self-tuning
solutions for the dark energy problem and theories that provide such
solutions.
2η ώρα: Black holes and no hair theorems (part I)
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.
Οι επόμενες διαλέξεις θα γίνουν την Τρίτη 27/2/2018, 13:00-15:00 (θα υπάρξει ξεχωριστή ανακοίνωση).
ΥΛΙΚΟ