Late time cosmological approach in mimetic f(R,T)f(R,T) gravity

In this paper, we investigate the late-time cosmic acceleration in mimetic $f(R,T)$ gravity with Lagrange multiplier and potential in a Universe containing, besides radiation and dark energy, a self-interacting (collisional) matter. We obtain through the modified Friedmann equations, the main equation that can describe the cosmological evolution and with several models from $Q(z)$ and the well known particular model $f(R, T)$, we perform an analysis of the late-time evolution. We examine the behavior of the Hubble parameter, the dark energy equation of state and the total effective equation of state and we compare in each case the resulting picture with the non-collisional matter (assumed as dust) and also with the collisional matter in mimetic $f(R, T)$ gravity. The results obtained are in good agreement with the observational data and show that in presence of the collisional matter the dark energy oscillations in mimetic f(R, T) gravity can be damped.Comment: 18 pages, 2 figure

Late time cosmological approach in mimetic f(R,T)f(R,T) gravity

In this paper, we investigate the late-time cosmic acceleration in mimetic $f(R,T)$ gravity with Lagrange multiplier and potential in a Universe containing, besides radiation and dark energy, a self-interacting (collisional) matter. We obtain through the modified Friedmann equations, the main equation that can describe the cosmological evolution and with several models from $Q(z)$ and the well known particular model $f(R, T)$, we perform an analysis of the late-time evolution. We examine the behavior of the Hubble parameter, the dark energy equation of state and the total effective equation of state and we compare in each case the resulting picture with the non-collisional matter (assumed as dust) and also with the collisional matter in mimetic $f(R, T)$ gravity. The results obtained are in good agreement with the observational data and show that in presence of the collisional matter the dark energy oscillations in mimetic f(R, T) gravity can be damped.Comment: 18 pages, 2 figure

Effect of “Irkoy Gomni” Micro-credit scheme on Resource- Use in cattle fattening in Tillabery Region of Niger Republic

This study was carried out to ascertain whether credit obtained for cattle fattening has had any meaningful contribution to the resources used by the beneficiary farmers in Kollo LGA of Tillabery Region Niger Republic. One hundred loan beneficiary cattle fattening farmers were randomly selected out of a sampling frame of 732 beneficiaries with not less than 5 borrowing circles. One hundred non-beneficiary cattle fatteners who were immediate neighbours of the sampled beneficiaries were also randomly selected from an established sampling frame obtained from the village heads to make a total sample size of 200, comprising of 100 beneficiaries and 100 non beneficiaries. Data were analyzed using descriptive statistics, chi-square and multiple regressions. The results showed that cattle fattening was the most preferred economic activity for both the beneficiaries (94%) and their non beneficiary counterparts (91%). The chisquare value (5.192) showed no significant difference in preferences of the economic activities between the two sets of farmers. Credit delivered to the beneficiaries enabled them use higher quantities of feed (P<0.01) and labour resources (P<0.1) than their non-beneficiary counterparts. Similarly, credit delivered has brought about significant increase (P<0.01) in revenue accrued to the fattening business of the beneficiary farmers. Based on the results, it is recommended that the scope of the credit be expanded to cover more farmers in the area. &#160

Rastall Cosmology and the \Lambda CDM Model

Rastall's theory is based on the non-conservation of the energy-momentum tensor. We show that, in this theory, if we introduce a two-fluid model, one component representing vacuum energy whereas the other pressureless matter (e.g. baryons plus cold dark matter), the cosmological scenario is the same as for the \Lambda CDM model, both at background and linear perturbative levels, except for one aspect: now dark energy may cluster. We speculate that this can lead to a possibility of distinguishing the models at the non-linear perturbative level.Comment: 9 pages, 1 figure. Accepted for publication in Physical Review

Effet du système de production sur l'âge au premier vêlage chez la vache Borgou au Bénin. – Etude rétrospective

Effect of Production Systems on Age at First Calving on Borgou Cow in Benin. -Retrospective Study. Data collected from "Monastère de l'Etoile" in department of Borgou in Benin, were used to evaluate the age at first calving of Borgou cow under two different production systems, i.e., extensive and semi-intensive. Production systems significantly affect age at first calving (p< 0.01): cow represented in the extensive system had a higher age at first calving than those presented in the semi-intensive system