Your browser does not support JavaScript!

Home    Search  

Results - Details

Search command : Author="Παυλίδου"  And Author="Βασιλίκη"

Current Record: 7 of 39

Back to Results Previous page
Next page
Add to Basket
[Add to Basket]
Identifier 000459427
Title Turnaround density as a probe of the dark energy equation of state
Alternative Title Η πυκνότητα αναστροφής ως διαγνωστικό μέσο για την εξίσωση κατάστασης της σκοτεινής ενέργειας
Author Κυβερνητάκη-Σινάνη, Άννα Ν.
Thesis advisor Παυλίδου, Βασιλική
Reviewer Ζέζας, Ανδρέας
Νιάρχος, Βασίλειος
Abstract Turnaround density probes cosmology. In other words, the matter density within the turnaround radius of a large-scale structure depends on cosmology. So far, it has been shown, both through spherical collapse calculations and through N-body simulations, that measurements of the turn-around density can probe both the matter and dark energy density parameters. These calculations assumed that dark energy had the form of a cosmological constant. They showed the turnaround density is particularly sensitive to the halting of structure growth imparted by a cosmological constant or, alternatively, dark energy. In this thesis, we study how different equations of state of dark energy affect the turnaround density, and whether we can use observations of turnaround density in galaxy clusters to constrain the dark energy equation of state. We do so within the context of the spherical collapse model. We explore both clustering and non-clustering dark energy, and in particular we study the sensitivity of the evolution of the turnaround density on the value of w which parameterizes the dark energy equation of state, in each of the two cases. We find that the behavior of the turnaround density with time is qualitatively similar in all the cases studied (converging for high redshift; decreasing at low redshift). However, they are different enough for the turnaround density to act as a meaningful probe of the dark energy equation of state. Interestingly, we also find no-go regimes for turnaround in the case of non-clustering dark energy, or even cases where structures disintegrate after turnaround, consistent with "big rip" scenarios.
Language English
Subject Cosmology
Large-scale structure
Δομές μεγάλης κλίμακας
Κοσμολογία
Issue date 2023-11-22
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/e/2/4/metadata-dlib-1697270436-23970-3304.tkl Bookmark and Share
Views 869

Digital Documents
No preview available

Download document
View document
Views : 4