609 research outputs found
Entangling two Bose Einstein condensates in a double cavity system
We propose a scheme to transfer the quantum state of light fields to the
collective density excitations of a Bose Einstein condensate (BEC) in a cavity.
This scheme allows to entangle two BECs in a double cavity setup by
transferring the quantum entanglement of two light fields produced from a
nondegenerate parametric amplifier (NOPA) to the collective density excitations
of the two BECs. An EPR state of the collective density excitations can be
created by a judicious choice of the system parameters.Comment: 3 figure
Deciphering Universal Extra Dimension from the top quark signals at the CERN LHC
Models based on Universal Extra Dimensions predict Kaluza-Klein (KK)
excitations of all Standard Model (SM) particles. We examine the pair
production of KK excitations of top- and bottom-quarks at the Large Hadron
Collider. Once produced, the KK top/bottom quarks can decay to -quarks,
leptons and the lightest KK-particle, , resulting in 2 -jets, two
opposite sign leptons and missing transverse momentum, thereby mimicing
top-pair production. We show that, with a proper choice of kinematic cuts, an
integrated luminosity of 100 fb would allow a discovery for an inverse
radius upto GeV.Comment: 18 pages, 14 figures, Accepted for publication in JHE
Effect of post harvest ripening on bioactive secondary metabolites and antioxidant activity in mango cv. Amrapali
Mango possesses many bioactive phytonutrients at ripe stage which boost our immune systemagainst many diseases. Post harvest ripening plays a major role in changes in those bioactivephytochemicals and their antioxidant activity. Hence, the present study was undertaken toassess the changes in bioactive phytonutrients and total antioxidant activity during ripeningof mango cv. Amrapali. The fruits were analyzed for total antioxidants, total phenols, totalflavonoids and total carotenoids from the day of harvest to its deterioration. Fruit peel andpulp color was measured with SPH850 spectrophotometer on the basis of the CIE LAB colorsystem (L*, a* and b*). The results revealed that total phenols (36.11 to 66.53mg GAE 100g-1),total flavonoids (14.33 to 34.67mg QE 100g-1), total carotenoids (2.23 to 11.47mg 100g-1) andtotal antioxidant (0.37 to 0.76 mmol Trolox 100g-1) activity increased gradually from day one toninth day after harvest and decreased slightly thereafter up to eleventh day of harvest excepttotal carotenoids, which remained constant. Strong correlations between total phenols (0.94),total flavonoids (0.86) and total carotenoids (0.97) with total antioxidant activity were noticed.Positive relationship between total carotenoids and L*, a*, b* values in mango peel and pulpduring ripening was also observed. It can be concluded that ripening affected the compositionof bioactive phytonutrients and their antioxidant activity in mango andmaximum nutraceuticalscontents were noticed from seven to nine days after harvest
Damping in 2D and 3D dilute Bose gases
Damping in 2D and 3D dilute gases is investigated using both the
hydrodynamical approach and the Hartree-Fock-Bogoliubov (HFB) approximation .
We found that the both methods are good for the Beliaev damping at zero
temperature and Landau damping at very low temperature, however, at high
temperature, the hydrodynamical approach overestimates the Landau damping and
the HFB gives a better approximation. This result shows that the comparison of
the theoretical calculation using the hydrodynamical approach and the
experimental data for high temperature done by Vincent Liu (PRL {\bf21} 4056
(1997)) is not proper. For two-dimensional systems, we show that the Beliaev
damping rate is proportional to and the Landau damping rate is
proportional to for low temperature and to for high temperature. We
also show that in two dimensions the hydrodynamical approach gives the same
result for zero temperature and for low temperature as HFB, but overestimates
the Landau damping for high temperature.Comment: 11 pages, 4 figure
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