We analyze a model of cold axion dark matter weakly coupled with a dark gluon condensate, reproducing dark energy. We first review how to recover the dark energy behavior using the functional renormalization group app...We analyze a model of cold axion dark matter weakly coupled with a dark gluon condensate, reproducing dark energy. We first review how to recover the dark energy behavior using the functional renormalization group approach, and ground our study in the properties of the effective Lagrangian, to be determined non-perturbatively. Then, within the context of GSM×SU（2）D×U（1）PQ, we consider Yang-Mills condensate （YMC） interactions with QCD axions. We predict a transfer of dark energy density into dark matter density, that can be tested in the next generation of experiments dedicated to dark energy measurements. We obtain new bounds on the interactions between the Yang-Mills condensate and axion dark matter from Planck data：the new physics interaction scale related to the axion/gluon condensate mixing is constrained to be higher than the 106 GeV energy scale.展开更多
We extend the unitary groups beyond the SU(5)and SU(6)to determine possible grand unified theories that give rise to three-generational Standard Model fermions without simple repetitions.By demanding asymptotic free t...We extend the unitary groups beyond the SU(5)and SU(6)to determine possible grand unified theories that give rise to three-generational Standard Model fermions without simple repetitions.By demanding asymptotic free theories at short distances,we find gauge groups of SU(7),SU(8),and SU(9),together with their anomaly-free irreducible representations,are such candidates.Two additional gauge groups of SU(10)and SU(11)can also achieve the generational structure without asymptotic freedom.We also deduce that these models can solve the Peccei-Quinn(PQ)quality problem,which is intrinsic in the axion models,with the leading PQ-breaking operators determined from the symmetry requirement.展开更多
基金Supported by the Shanghai Municipality(KBH1512299)Fudan University(JJH1512105)
文摘We analyze a model of cold axion dark matter weakly coupled with a dark gluon condensate, reproducing dark energy. We first review how to recover the dark energy behavior using the functional renormalization group approach, and ground our study in the properties of the effective Lagrangian, to be determined non-perturbatively. Then, within the context of GSM×SU（2）D×U（1）PQ, we consider Yang-Mills condensate （YMC） interactions with QCD axions. We predict a transfer of dark energy density into dark matter density, that can be tested in the next generation of experiments dedicated to dark energy measurements. We obtain new bounds on the interactions between the Yang-Mills condensate and axion dark matter from Planck data：the new physics interaction scale related to the axion/gluon condensate mixing is constrained to be higher than the 106 GeV energy scale.
基金Partially Supported by the National Natural Science Foundation of China(12035008,11575176)。
文摘We extend the unitary groups beyond the SU(5)and SU(6)to determine possible grand unified theories that give rise to three-generational Standard Model fermions without simple repetitions.By demanding asymptotic free theories at short distances,we find gauge groups of SU(7),SU(8),and SU(9),together with their anomaly-free irreducible representations,are such candidates.Two additional gauge groups of SU(10)and SU(11)can also achieve the generational structure without asymptotic freedom.We also deduce that these models can solve the Peccei-Quinn(PQ)quality problem,which is intrinsic in the axion models,with the leading PQ-breaking operators determined from the symmetry requirement.
