Large extra dimensions, the galaxy power spectrum and the end of inflation
نویسندگان
چکیده
We consider the production of gravitational KK modes via cosmological photon-photon and electron-positron annihilation in models with large factorisable extra dimensions. We place constraints on this production using recent results from a joint analysis of the power spectra of the 2dF Galaxy Redshift Survey (2dFGS) and the cosmic microwave background (CMB) anisotropies. We obtain a more accurate upper limit for the temperature corresponding to matter-radiation equality and show that, even for the case of 6 extra dimensions and a fundamental scale of 1 TeV, a period of inflation is required that ends at a temperature much lower than that of the QCD phase transition.
منابع مشابه
The Cold Dark Matter Density Perturbation
The outstanding problem in cosmology today is undoubtedly the origin and evolution of large scale structure. In this context, no model has proved as successful as the standard Cold Dark Matter (CDM) model, based on a flat (scale-invariant) spectrum of density fluctuations growing under gravitational instability. Nevertheless, pressure has recently been exerted on the model both from analyses of...
متن کاملTransdimensional physics and inflation
Within the framework of a five-dimensional brane world with a stabilized radion, we compute the cosmological perturbations generated during inflation and show that the perturbations are a powerful tool to probe the physics of extra dimensions. While we find that the power spectrum of scalar perturbations is unchanged, we show that the existence of the fifth dimension is imprinted on the spectru...
متن کاملLovelock inflation and the number of large dimensions
We discuss an inflationary scenario based on Lovelock terms. These higher order curvature terms can lead to inflation when there are more than three spatial dimensions. Inflation will end if the extra dimensions are stabilised, so that at most three dimensions are free to expand. This relates graceful exit to the number of large dimensions.
متن کاملGeneralised Inflation with a Gravitational Wave Background
We propose a Λ-inflation model which explains a significant part of the COBE signal by primordial cosmic gravitational waves. The primordial density perturbations fulfill both the constraints of large-scale microwave background and galaxy cluster normalization. The model is tested against the galaxy cluster power spectrum and the high-multipole angular CMB anisotropy.
متن کاملBaryogenesis in theories with large extra spatial dimensions
We describe a simple and predictive scenario for baryogenesis in theories with large extra dimensions which resembles Affleck-Dine baryogenesis. The Affleck-Dine field is a complex scalar field carrying a U(1)χ charge which is dynamically broken after the end of inflation. This generates an excess of χ over χ̄, which then decays into Standard Model fermions to produce an excess of baryons over a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001