6,345 research outputs found
Modification of Heisenberg uncertainty relations in non-commutative Snyder space-time geometry
We show that the Euclidean Snyder non-commutative space implies infinitely
many different physical predictions. The distinct frameworks are specified by
generalized uncertainty relations underlying deformed Heisenberg algebras.
Considering the one-dimensional case in the minisuperspace arena, the bouncing
Universe dynamics of loop quantum cosmology can be recovered.Comment: 5 pages; title changed, to appear in PR
Matter instability in modified gravity
The Dolgov-Kawasaki instability discovered in the matter sector of the
modified gravity scenario incorporating a 1/R correction to Einstein gravity is
studied in general f(R) theories. A stability condition is found in the metric
version of these theories to help ruling out models that are unviable from the
theoretical point of view.Comment: 4 pages, revtex, to appear in Phys. Rev. D. In the revised version,
an error concerning the Palatini version of these theories has been corrected
and the references update
Cigarrinha-das-Pastagens : uma praga que retorna com as chuvas.
bitstream/item/139024/1/cnpgc-divulga-08.pdfCNPGC. Serie nao convencional
Haematobia irritans L: um novo problema para a bovinocultura no Brasil.
bitstream/item/138551/1/COT-25.pdfCNPGC
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