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BEGIN:VEVENT
SUMMARY:Tatsuya Ogawa (小川達也\, Tohoku U.) "Solitinic gravastars in 
 a U(1) gauge-Higgs model"
DTSTART;VALUE=DATE-TIME:20240509T043000Z
DTEND;VALUE=DATE-TIME:20240509T053000Z
UID:167609867760
DESCRIPTION:アブスト：It is known that black holes have unsolved prob
 lems such as the singularity problem and the information loss problem. To 
 solve these problems\, as one of the black hole mimicker\, gravastar is pr
 oposed. Gravastar is filled by cosmological constant\, and therefore metri
 c is de-Sitter inside the star. In usual\, gravastar solutions are constru
 cted by using Israel’s junction condition. By the way\, in classical fie
 ld theories with global U(1) symmetry\, it is known that there are classic
 al solutions called nontopological solitons which the fields are spatially
  localized. Recently\, we have found that there exists a nontopological so
 liton (NTS) in the coupled system of a complex scalar field\, a U(1) gauge
  field\, and a complex Higgs field. The NTSs are filled with the cosmologi
 cal constant. In this presentation\, we will show that a gravastar solutio
 n can be realized by coupling a gravitational field to this NTS solution a
 nd discuss its properties.
LOCATION:
END:VEVENT
BEGIN:VEVENT
SUMMARY:Akifumi Chitose (千歳彬文\, ICRR) "Revisiting Metastable Cosmi
 c String Breaking"
DTSTART;VALUE=DATE-TIME:20240516T043000Z
DTEND;VALUE=DATE-TIME:20240516T053000Z
UID:492582871999
DESCRIPTION:abstract: \nMetastable cosmic strings are gathering attention 
 as potential progenitors of stochastic gravitatioanl wave background. They
  result from a two-step symmetry breaking $G\\to H\\to 1$ with $\\pi_1(H)\
 ne 0$ and $\\pi_1(G)=0$\, and decay via internal monopole-antimonopole pai
 r creation.\nConventionally\, the breaking rate has been estimated by an i
 nfinitely thin string approximation\, which requires a large hierarchy bet
 ween the symmetry breaking scales.\nWe numerically constructed a tunneling
  path and thus obtained a robust lower limit on the tunneling factor $e^{-
 S}$ even for mild scale hierarchy. In particular\, it is relevant to the c
 osmic string interpretation of the gravitational wave signals recently rep
 orted by pulsar timing array experiments.
LOCATION:
END:VEVENT
BEGIN:VEVENT
SUMMARY:Journal Club\, K. Hikasa
DTSTART;VALUE=DATE-TIME:20240524T033000Z
DTEND;VALUE=DATE-TIME:20240524T043000Z
UID:325801048534
DESCRIPTION:Place: Room 721
LOCATION:
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yushi Mura (村勇志\, Osaka U.) TBA
DTSTART;VALUE=DATE-TIME:20240530T000000Z
DTEND;VALUE=DATE-TIME:20240530T010000Z
UID:327705068582
DESCRIPTION:Yushi Mura (村勇志\, Osaka U.) TBA
LOCATION:
END:VEVENT
BEGIN:VEVENT
SUMMARY:Journal Club\, M. Fukuda
DTSTART;VALUE=DATE-TIME:20240531T033000Z
DTEND;VALUE=DATE-TIME:20240531T043000Z
UID:129628608550
DESCRIPTION:Place: Room 721
LOCATION:
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuya Kusuki (楠亀 裕哉\, 九州大) "TBA"@721
DTSTART;VALUE=DATE-TIME:20240606T043000Z
DTEND;VALUE=DATE-TIME:20240606T053000Z
UID:272796601310
DESCRIPTION:Yuya Kusuki (楠亀 裕哉\, 九州大) "TBA"@721
LOCATION:
END:VEVENT
END:VCALENDAR