79 research outputs found
LOFF and breached pairing with cold atoms
We investigate here the Cooper pairing of fermionic atoms with mismatched
fermi surfaces using a variational construct for the ground state. We determine
the state for different values of the mismatch of chemical potential for weak
as well as strong coupling regimes including the BCS BEC cross over region. We
consider Cooper pairing with both zero and finite net momentum. Within the
variational approximation for the ground state and comparing the thermodynamic
potentials, we show that (i) the LOFF phase is stable in the weak coupling
regime, (ii) the LOFF window is maximum on the BEC side near the Feshbach
resonance and (iii) the existence of stable gapless states with a single fermi
surface for negative average chemical potential on the BEC side of the Feshbach
resonance.Comment: 14 pages including 10 figures, Some figures redrawn with more data
points, more references added, few sentences added in discussions, version to
appear in Eur. Phys. Journal
D-mesons and charmonium states in hot isospin asymmetric strange hadronic matter
We study the properties of and mesons in hot isospin asymmetric
strange hadronic matter, arising due to their interactions with the hadrons in
the hyperonic medium. The interactions of and mesons with these
light hadrons are derived by generalizing the chiral SU(3) model used for the
study of hyperonic matter to SU(4). We also study the mass modifications of the
charmonium states , and in the isospin
asymmetric strange hadronic matter at finite temperatures and investigate the
possibility of the decay of the charmonium states into pairs in the
hot hadronic medium. The mass modifications of these charmonium states arise
due to their interaction with the gluon condensates of QCD, simulated by a
scalar dilaton field introduced to incorporate the broken scale invariance of
QCD within the effective chiral model. We also compute the partial decay widths
of the charmonium states to the pairs in the hadronic medium. The
strong dependence on density of the in-medium properties of the ,
and the charmonium states, as well as the partial decay widths of charmonium
states to pairs, found in the present investigation, will be of
direct relevance in observables like open charm enhancement as well as
suppression in the compressed baryonic matter (CBM) experiments at the future
Facility for Antiproton and Ion Research, GSI, where the baryonic matter at
high densities is planned to be produced.Comment: Accepted for publication in Eur.Phys.Jour. A. Substantially more work
has been done and the manuscript has been modified with addition of a new
section and new figure
- …