5,823 research outputs found
Cosmology in the Universe with distance dependent Lorentz-violating bakground
We consider a cosmological setup with the inflaton field in the presence of a
redshift dependent Lorentz-violating time-like background to address the
inflationary regime and other phases of the Universe. We also show that the
regime of dark energy at large distances (low redshifts) is essentially
dominated by the presence of the Lorentz-violating background.Comment: 8 pages, no figure, Latex, to appear in AHE
Qualidade do leite armazenado em tanques coletivos.
Importância da refrigeração do leite ; Tanques coletivos; Pesquisa sobre a qualidade do leite de tanques coletivos; Uma segunda pesquisa: maio de 2007 a junho de 2008.bitstream/item/65295/1/CT-99-Qualid-leite-armaz-tanq-coletivos.pd
Induced Chern-Simons-like action in Lorentz-violating massless QED
In the present work, we study different aspects of Lorentz and CPT symmetry
violation in extended massless QED. By following the observation that the 2+1
dimensional Maxwell-Chern-Simons theory can be originated from the 3+1
dimensional Chern-Simons-like action, we also focus on the fermion sector to
relate the 3+1 dimensional extended massless QED to 2+1 dimensional massive
QED. We take advantage of this to state that the Chern-Simons-like action in
extended massless QED can be induced with its coefficient being well defined
and finite just as its 2+1 counterpart. We make use of three different
regularization schemes by inducting the Chern-Simons-like in 3+1 dimensions to
support this conjecture.Comment: To appear in Phys. Rev. D, 7 pages, 2 eps figures, minor change
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