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SUMMARY:Contributory: Inflationary trispectrum of gauge fields from scalar
  and tensor exchanges
DTSTART;VALUE=DATE-TIME:20261117T091500Z
DTEND;VALUE=DATE-TIME:20261117T093000Z
DTSTAMP;VALUE=DATE-TIME:20261026T170053Z
UID:indico-contribution-983@indico.narit.or.th
DESCRIPTION:Speakers: Jishnu Sai Puthiyedath (Ewha Womans University\, Seo
 ul)\nIn this paper\, we compute the inflationary trispectrum of primordial
  gauge fields generated through the scalar and tensor exchanges in models 
 with spectator U(1) gauge fields which are kinetically coupled to the infl
 aton. Focusing on the connected four-point autocorrelation function of gau
 ge fields\, we derive exact analytical expressions for the full trispectru
 m of both electric and magnetic fields using the in-in formalism and cosmo
 logical diagrammatic rules\, and explore their respective contributions in
  specific momentum configurations. For the scalar exchange\, we find that 
 the trispectrum signal in the equisided configuration grows with the excha
 nge momentum and reaches its maximum in the flattened limit. However\, in 
 the counter collinear limit\, we show that the non-linearity parameter ass
 ociated with the trispectrum scales quadratically with the corresponding p
 arameter of the cross-correlation bispectrum of magnetic fields and curvat
 ure perturbations\, thereby establishing a hierarchical relation between t
 he higher- and lower-order correlation functions. For the tensor exchange\
 , the trispectrum displays a richer angular dependence\, reflecting the se
 nsitivity to the orientation of the momentum quadrilateral with respect to
  the tensor polarisation\, producing characteristic angular modulations in
  the trispectrum. Detecting such angular signatures in future high-precisi
 on cosmological observations would provide a novel window into tensor-medi
 ated interactions in the early universe.\n\nhttps://indico.narit.or.th/eve
 nt/234/contributions/983/
LOCATION:Pattaya\, Thailand D Varee Jomtien Beach Pattaya Hotel
URL:https://indico.narit.or.th/event/234/contributions/983/
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