Noncommutativity in space and primordial magnetic field.
نویسندگان
چکیده
In this paper we show that noncommutativity in spatial coordinates can generate magnetic field in the early Universe on a horizon scale. The strength of such a magnetic field depends on the number density of massive charged particles present at a given moment. This allows us to trace back the temperature dependence of the noncommutativity scale from the bounds on primordial magnetic field coming from nucleosynthesis.
منابع مشابه
Coordinate Noncommutativity in Strong Non-Uniform Magnetic Fields
Noncommutativity of space coordinates has been much studied from various points of view [1-3]. It arises naturally in string theory, where it is related to the presence of strong backgrounds fields. If these are constant, one obtains the more familiar case where the coordinate noncommutativity [x, x ] is a constant antisymmetric quantity. However, if the background fields depend on the spatial ...
متن کاملSpace-Time Noncommutative Field Theories And Unitarity
We study the perturbative unitarity of noncommutative scalar field theories. Field theories with space-time noncommutativity do not have a unitary S-matrix. Field theories with only space noncommutativity are perturbatively unitary. This can be understood from string theory, since space noncommutative field theories describe a low energy limit of string theory in a background magnetic field. On...
متن کاملNoncommutativity and the lightfront
We discuss various limits which transform configuration space into phase space, with emphasis on those related to lightfront field theory, and show that they are unified by spectral flow. Examples include quantising in ‘almost lightfront’ coordinates and the appearance of lightlike noncommutativity from a strong background laser field. We compare this with the limit of a strong magnetic field, ...
متن کاملSuperluminal Noncommutative Photons
With the help of the Seiberg-Witten map, one can obtain an effective action of a deformed QED from a noncommutative QED. Starting from the deformed QED, we investigate the propagation of photons in the background of electromagnetic field, up to the leading order of the noncommutativity parameter. In our setting (both the electric and magnetic fields are parallel to the coordinate axis x and the...
متن کاملTest of Quantum Effects of Spatial Noncommutativity using Modified Electron Momentum Spectroscopy
The possibility of testing spatial noncommutativity by current experiments on normal quantum scales is investigated. For the case of both position-position and momentum-momentum noncommuting spectra of ions in crossed electric and magnetic fields are studied in the formalism of noncommutative quantum mechanics. In a limit of the kinetic energy approaching its lowest eigenvalue this system posse...
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:
- Physical review letters
دوره 87 1 شماره
صفحات -
تاریخ انتشار 2001