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SUMMARY:A gas of null strings in the early and late Universe: from local d
 ynamics to accelerated expansion
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261101T215722Z
UID:indico-contribution-6452@cern.ch
DESCRIPTION:Speakers: Марина Хуторная (Студент)\nMode
 rn analysis of data from early- and late-epoch cosmological probes has rev
 ealed statistically significant tensions between predictions for different
  stages of the Universe's evolution. Key among them are the discrepancies 
 in the determination of the Hubble constant $H_{0}$ and the parameter $S_{
 8}$\, which characterizes the amplitude of matter density fluctuations. On
 e of the most promising ways to resolve these contradictions is the concep
 t of dynamical dark energy\, moderate observational indications of whose e
 xistence are contained in the recent DESI BAO DR2 data release. The gas of
  thin tubes of a massless scalar field also belongs to the class of dynami
 cal dark energy models\, since the parameter $w$ of its equation of state 
 is a dynamical function of the density. In this work\, we investigated the
  influence of the evolution of the gravitational field of a single closed 
 thin tube of a massless scalar field\, radially changing its size\, on the
  trajectories of a test null string. We also investigated how constraints 
 on the trajectories of test objects can macroscopically influence the dyna
 mics of the accelerated expansion of the entire gas of thin tubes on cosmo
 logical scales.\n\nhttps://indico.particle.mephi.ru/event/626/contribution
 s/6452/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6452/
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