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Black hole perturbation in parity violating gravitational theories
Black hole perturbation parity violating gravitational theories
2011/10/14
We study linear perturbations around the static and spherically symmetric spacetime for the gravitational theories whose Lagrangian depends on Ricci scalar and the parity violating Chern-Simons term. ...
Spontaneousa chiral parity breaking by hydromagnetic buoyancy
Spontaneousa chiral parity hydromagnetic buoyancy
2010/11/11
Evidence for a parity-breaking nature of the magnetic buoyancy instability in a stably stratified gas is reported.In the absence of rotation, no helicity is produced, but the non-helical state is foun...
Large-angle correlation anomalies and odd-parity preference in CMB data
cosmic background radiation early universe methods: data analysis meth-ods: statistical
2010/11/9
Angular power spectrum of CMB anisotropy and two point angular point correlation possess some
equivalence. Noting this, we have investigated the association between the WMAP large-angle corre-lation ...
Cosmological observations on the largest scales exhibit a solid record of unexpected anomalies and alignments, apparently pointing towards a large scale violation of statistical isotropy. These includ...
Measurement of the cosmic microwave background (CMB) bispectrum, or three-point correlation function, has now become one of the principle efforts in early-Universe cosmology. Here we show that there i...
Anomalous parity asymmetry of WMAP power spectrum data at low multpoles: is it cosmological or systematics?
parity asymmetry cosmological WMAP power spectrum data
2010/3/8
We have investigated the odd-parity preference of the WMAP 7 year power spectrum. Our investigation shows parity asymmetry of the WMAP data (2<= l <=22) is anomalous at 4-in-1000 level. We also find i...