Cosmological birefringence induced by neutrino current
نویسندگان
چکیده
منابع مشابه
Current cosmological bounds on neutrino masses and relativistic relics
We combine the most recent observations of large-scale structure (2dF and SDSS galaxy surveys) and cosmic microwave anisotropies (WMAP and ACBAR) to put constraints on flat cosmological models where the number of massive neutrinos and of massless relativistic relics are both left arbitrary. We discuss the impact of each dataset and of various priors on our bounds. For the standard case of three...
متن کاملNonuniform cosmological birefringence and active galactic nuclei
Marc Kamionkowski California Institute of Technology, Mail Code 350-17, Pasadena, California 91125, USA (Received 21 April 2010; revised manuscript received 28 April 2010; published 25 August 2010) The CMB constrains the cosmological-birefringence rotation angle to be j j & 1 (1 ) out to redshifts z ’ 1100 for a rotation that is uniform across the sky. However, the rotation angle ð ; Þ may vary...
متن کاملObservational Evidence Against Birefringence over Cosmological Distances
In a recent paper, Nodland and Ralston [1] claim to find a systematic rotation of the plane of polarization of electromagnetic waves propagating over cosmological distances. Their claimed effect is large, requiring the plane of polarization from high redshift objects to be rotated by as much as 3.0 radians – an easily detectable signature. Here we report new optical data taken with the Keck Tel...
متن کاملCosmological Neutrino Background Revisited
We solve the Boltzmann equation for cosmological neutrinos around the epoch of the electron-positron annihilation in order to verify the freeze-out approximation and to compute accurately the cosmological neutrino distribution function. We find the radiation energy density to be about 0.3% higher than predicted by the freeze-out approximation. As a result, the spectrum of the Cosmic Microwave B...
متن کاملCosmological Neutrino Condensates
We investigate the possibility that neutrinos form superfluid-type condensates in background cosmological densities. Such condensates could give rise to small neutrino masses and splittings, as well as an important contribution, perhaps, to the cosmological constant. We discuss various channels in the context of the standard model. Many of these do not support a condensate, but some mixed-flavo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Canadian Journal of Physics
سال: 2008
ISSN: 0008-4204,1208-6045
DOI: 10.1139/p07-178