6,017 research outputs found
Fisher matrix forecasts for astrophysical tests of the stability of the fine-structure constant
We use Fisher Matrix analysis techniques to forecast the cosmological impact
of astrophysical tests of the stability of the fine-structure constant to be
carried out by the forthcoming ESPRESSO spectrograph at the VLT (due for
commissioning in late 2017), as well by the planned high-resolution
spectrograph (currently in Phase A) for the European Extremely Large Telescope.
Assuming a fiducial model without variations, we show that ESPRESSO
can improve current bounds on the E\"{o}tv\"{o}s parameter---which quantifies
Weak Equivalence Principle violations---by up to two orders of magnitude,
leading to stronger bounds than those expected from the ongoing tests with the
MICROSCOPE satellite, while constraints from the E-ELT should be competitive
with those of the proposed STEP satellite. Should an variation be
detected, these measurements will further constrain cosmological parameters,
being particularly sensitive to the dynamics of dark energy.Comment: Phys. Lett. B (in press
Atualização sobre tricomonose genital bovina.
A tricomonose é uma doença venérea de bovinos causada por um protozoário flagelado denominado Tritrichomonas foetus (T.foetus), cujo habitat é o trato genital de bovinos sendo transmitido do macho para a fêmea através da monta ou pelo uso de sêmen contaminado. O T.foetus é um protozoário de morfologia piriforme com três flagelos em posição cranial e um caudal, cujo tamanho oscila entre entre 8-18mm de comprimento e 4-9 de largura. Se caracteriza por possuir 4 flagelos, 3 deles são anteriores e livres e o 4o acompanha a membrana ondulante, que é perfeitamente visÃvel quando em microscopia, localizando-se na parte posterior.bitstream/item/81135/1/DOC54.pd
Specific heat amplitude ratios for anisotropic Lifshitz critical behaviors
We determine the specific heat amplitude ratio near a -axial Lifshitz
point and show its universal character. Using a recent renormalization group
picture along with new field-theoretical -expansion techniques,
we established this amplitude ratio at one-loop order. We estimate the
numerical value of this amplitude ratio for and . The result is in
very good agreement with its experimental measurement on the magnetic material
. It is shown that in the limit it trivially reduces to the
Ising-like amplitude ratio.Comment: 8 pages, RevTex, accepted as a Brief Report in Physical Review
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