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SUMMARY:Plenary — Ryo Saito: Probing the Early Universe with Gravitation
 al-Wave Background Anisotropies: Universal Structures at Large Angles
DTSTART;VALUE=DATE-TIME:20261118T040000Z
DTEND;VALUE=DATE-TIME:20261118T050000Z
DTSTAMP;VALUE=DATE-TIME:20261026T151204Z
UID:indico-contribution-1071@indico.narit.or.th
DESCRIPTION:The stochastic gravitational-wave background (SGWB) offers a n
 ew window onto the early Universe. While its sky-averaged spectrum is the 
 primary target of current searches\, distinct primordial and astrophysical
  mechanisms can produce similar spectra over a finite observational band. 
 Angular anisotropies provide complementary information that may help ident
 ify the origin of a signal.\n\nThe importance of such information is famil
 iar from the cosmic microwave background (CMB). In particular\, large-angl
 e CMB anisotropies trace primordial perturbations that were superhorizon a
 t recombination and therefore provide a relatively direct window into infl
 ationary initial conditions. SGWB anisotropies may offer a similar probe\,
  potentially retaining information from epochs far earlier than recombinat
 ion. At the same time\, important differences exist between CMB and SGWB o
 bservations. I will discuss how these similarities and differences determi
 ne which angular information can be extracted from SGWB observables and ho
 w it should be interpreted.\n\nTo organize primordial SGWB anisotropies\, 
 I will introduce the Cosmological Form Factor (CFF)\, a model-independent 
 framework describing their response to cosmological long-wavelength pertur
 bations. The CFF characterizes how long modes modulate local short-scale G
 W statistics and connects observable anisotropies to cosmological correlat
 ion functions. This connection allows general principles\, including stati
 stical isotropy and locality\, to determine the angular and polarization s
 tructures\, while amplitudes\, frequency dependence\, and source-time depe
 ndence retain information about the underlying mechanism. Both propagation
  and fossil effects arise as representative realizations of this common fr
 amework. As an application\, I will show that nearly scale-invariant scala
 r long modes yield a universal Sachs–Wolfe-like large-angle scaling.\n\n
 https://indico.narit.or.th/event/234/contributions/1071/
LOCATION:Pattaya\, Thailand D Varee Jomtien Beach Pattaya Hotel
URL:https://indico.narit.or.th/event/234/contributions/1071/
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