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SUMMARY:Refining Gravitational Wave and Collider Physics Dialogue via Sing
 let Scalar Extension
DTSTART;VALUE=DATE-TIME:20260708T075000Z
DTEND;VALUE=DATE-TIME:20260708T081000Z
DTSTAMP;VALUE=DATE-TIME:20261027T091301Z
UID:indico-contribution-805@indico.narit.or.th
DESCRIPTION:Speakers: Van Que Tran (NCTS\, National Taiwan University)\nEm
 ploying effective field theory techniques\, we advance computations of the
 rmal parameters that enter predictions for the gravitational wave spectra 
 from first-order electroweak phase transitions. Working with the real-sing
 let-extended Standard Model\, we utilize recent lattice simulations to con
 firm the existence of first-order phase transitions across the free parame
 ter space. For the first time\, we account for several important two-loop 
 corrections in the high-temperature expansion for determining thermal para
 meters\, including the bubble wall velocity in the local thermal equilibri
 um approximation. We find that the requirement of completing bubble nuclea
 tion imposes stringent bounds on the new scalar boson mass.Moreover\, the 
 prospects for detection by LISA require first-order phase transitions in a
  two-step phase transition\, which display strong sensitivity to the porta
 l coupling between the Higgs and the singlet. Interestingly\, signals from
  di-Higgs boson production at the HL-LHC probe parameter regions that sign
 ificantly overlap with the LISA-sensitive region\, indicating the possibil
 ity of accounting for both signals if detected. Conversely\, depending on 
 the mixing angle\, a null result for di-Higgs production at the HL-LHC cou
 ld potentially rule out the model as an explanation for gravitational wave
  observations.\n\nhttps://indico.narit.or.th/event/236/contributions/805/
LOCATION:National Astronomical Research Institute of Thailand (NARIT) Andr
 omeda Meeting Room
URL:https://indico.narit.or.th/event/236/contributions/805/
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