The 4th UniverseNet School - Frontiers of Particle Cosmology

Session

6 talks (Chair: Minos AXENIDES)

16 Sept 2010, 16:30

Lecce, Università del Salento

3. Dr. HAMANN, Jan (Aarhus University): Supernova anisotropies

16/09/2010, 16:30

Measurements of the luminosity distances of type Ia supernovae can be used to reconstruct the local radial velocity field. I will introduce a method to extract the anisotropy spectrum from supernova data, discuss its usefulness as a cosmological probe, present the current state of affairs and give an outlook on the potential of upcoming surveys.

31. Mr. NADATHUR, Seshadri (University of Oxford): Confronting inhomogeneous cosmologies with CMB data

16/09/2010, 16:45

Recently there has been much interest in inhomogeneous cosmological models, especially Gpc scale voids described by an LTB metric, as a means to explain the supernovae Hubble diagram without the need for a cosmological constant. I will discuss these models and attempts to use the WMAP CMB angular power spectrum data to constrain them, especially in the context of alternative models of inflation.

60. Dr. NESSERIS, Savvas (NBIA Copenhagen): A model-independent null test on the cosmological constant

16/09/2010, 17:00

We use the Om statistic and the Genetic Algorithms (GA) in order to derive a null test on the spatially flat cosmological constant model ?CDM. This is done in two steps: first, we apply the GA to the Constitution SNIa data in order to acquire a model independent reconstruction of the expansion history of the Universe H(z) and second, we use the reconstructed H(z) in conjunction with the Om...

38. Dr. MALEC, Beata (Copernicus Center, Cracow): Cosmic Equation of state from Strong Gravitational Lensing Systems

16/09/2010, 17:15

Accelerating expansion of the Universe is a great challenge for both physics and cosmology. In light of lacking the convincing theoretical explanation, an effective description of this phenomenon in terms of a cosmic equation of state turns out useful. The strength of modern cosmology lies in consistency across independent, often unrelated pieces of evidence. Therefore, every alternative...

40. Dr. SHAFIELOO, Arman (University of Oxford): Problems of Reconstructing Dark Energy

16/09/2010, 17:30

62. Mr. MARSH, David (University of Oxford): Cosmology and the String Axiverse

16/09/2010, 17:45

It was noted in arXiv:0905.4720v2 [hep-th] that as a general feature "String theory suggests the simultaneous presence of many ultralight axions, possibly populating each decade of mass down to the Hubble scale 10-33eV". Axion like particles (ALPs) with masses of between $m=10^{-33}\mathbf{eV}$ and m=10^{-22}\mathbf{eV}$ can affect the growth of structure in the Universe through the matter...