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SUMMARY:A Joint Search for Circular Polarization and Kinematic Dipole Anis
 otropies in the Stochastic Gravitational-Wave Background
DTSTART;VALUE=DATE-TIME:20260710T044500Z
DTEND;VALUE=DATE-TIME:20260710T050000Z
DTSTAMP;VALUE=DATE-TIME:20261027T061010Z
UID:indico-contribution-815@indico.narit.or.th
DESCRIPTION:Speakers: Sevgi Karadağ (Tamkang University)\nCertain early-U
 niverse scenarios predict a stochastic gravitational-wave background (SGWB
 ) with nonzero circular polarization\, making its detection a potentially 
 powerful probe of parity-violating physics and the physics of the primordi
 al Universe. In addition to polarization\, the SGWB may exhibit anisotropi
 es. A particularly well-motivated contribution is the kinematic dipole ind
 uced by the observer’s motion relative to the cosmic rest frame.\n\nIn t
 his work\, we develop a unified Bayesian analysis framework to jointly inv
 estigate circular polarization and kinematic-dipole anisotropies in the SG
 WB. We model the cross-correlated detector response in terms of the circul
 ar-polarization parameter $\\Pi$\, the spectral index $\\alpha$\, the SGWB
  energy-density amplitude $\\Omega_{ref}$\, and the spherical-harmonic dip
 ole components $\\Omega^D_{1m}$that encode directional anisotropy. The pip
 eline is first validated through injection–recovery tests using simulate
 d data for third-generation detector networks consisting of Cosmic Explore
 r and Einstein Telescope. We further assess the projected sensitivity of t
 hese future detector networks. We then apply this framework to the LIGO/Vi
 rgo O1–O3 cross-spectral dataset. Finding no significant evidence for an
  SGWB signal\, we derive constraints on the parameters related to dipole a
 nisotropies and circular polarization. These results establish a framework
  for simultaneously probing circular polarization and Doppler-induced kine
 matic dipole anisotropies in the SGWB\, and highlight the potential of nex
 t-generation gravitational-wave observatories to place substantially stron
 ger constraints on parity-violating and anisotropic cosmological backgroun
 ds.\n\nhttps://indico.narit.or.th/event/236/contributions/815/
LOCATION:Novotel
URL:https://indico.narit.or.th/event/236/contributions/815/
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