BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Leptogenesis and baryon asymmetry in the early Universe for the ca se arbitrary hypermagnetic helicity DTSTART;VALUE=DATE-TIME:20161011T110000Z DTEND;VALUE=DATE-TIME:20161011T111500Z DTSTAMP;VALUE=DATE-TIME:20260814T145356Z UID:indico-contribution-94-726@cern.ch DESCRIPTION:Speakers: Alexander Smirnov (IZMIRAN)\nWe study hypermagnetic helicity and lepton asymmetry evolution in plasma of the early Universe be fore the electroweak phase transition (EWPT) accounting for chirality flip processes via inverse Higgs decays and sphaleron transitions which violat e the left lepton number and wash out the baryon asymmetry of the Universe (BAU). In the scenario where the right electron asymmetry supports the BA U alone through the conservation law B/3−L_{eR}=const at temperatures T> T_{RL}~ 10TeV the following universe cooling leads to the production of a non-zero left lepton (electrons and neutrinos) asymmetry. This is due to t he Higgs decays becoming more faster when entering the equilibrium at T=TR L with the universe expansion\, Γ{RL}~T>H~T^2\, resulting in the parallel evolution of both the right and the left electron asymmetries at T\n\nhtt ps://indico.particle.mephi.ru/event/4/contributions/726/ LOCATION:Milan Hotel Rossini URL:https://indico.particle.mephi.ru/event/4/contributions/726/ END:VEVENT BEGIN:VEVENT SUMMARY:On wormholes leading to extra dimensions DTSTART;VALUE=DATE-TIME:20161011T111500Z DTEND;VALUE=DATE-TIME:20161011T113000Z DTSTAMP;VALUE=DATE-TIME:20260814T145356Z UID:indico-contribution-94-691@cern.ch DESCRIPTION:Speakers: Kirill Bronnikov (VNIIMS)\nIn 6D general relativity with a scalar field as a source of gravity\, a new type of static wormhole solutions is presented: such wormholes connect our universe with a small 2D extra subspace with a universe where this extra subspace is large. We c onsider manifolds\nwith the structure M0 x M1 x M2\, where M0 is 2D Lorent zian space-time while each of M1 and M2 can be a 2-sphere or a 2-torus. Af ter selecting possible asymptotic behaviors of the metric functions compat ible with the field equations\, we give explicit examples of wormhole solu tions with spherical symmetry in our space-time and toroidal extra dimensi ons. In one example\, with a massless scalar field (it is a special case o f a well-known more general solution)\, the extra dimensions have a large constant size at the "far end"\;\nthe other example contains a nonzero sca lar field potential which provides a 6D anti-de Sitter asymptotic behavior \, where all spatial dimensions are infinite.\n\nhttps://indico.particle.m ephi.ru/event/4/contributions/691/ LOCATION:Milan Hotel Rossini URL:https://indico.particle.mephi.ru/event/4/contributions/691/ END:VEVENT BEGIN:VEVENT SUMMARY:On multidimensional gravity and the Casimir effect DTSTART;VALUE=DATE-TIME:20161011T113000Z DTEND;VALUE=DATE-TIME:20161011T114500Z DTSTAMP;VALUE=DATE-TIME:20260814T145356Z UID:indico-contribution-94-690@cern.ch DESCRIPTION:Speakers: Sergei Bolokhov (Peoples' Friendship University of R ussia)\nWe study the properties of an effective potential for the scale fa ctor of extra dimensions\nin a Kaluza-Klein-type model with a spherical ex tra factor space\, including a function of the scalar curvature and other quadratic curvature invariants\, taking into account the Casimir energy of massless scalar fields. We demonstrate the existence of a minimum of the potential\, able to induce a physically reasonable value of the effective cosmological constant in our space-time. Under the adopted assumptions\, i t is shown that the huge Casimir energy density can be compensated by the fine-tuned contribution of the curvature-nonlinear terms in the original a ction.\n\nhttps://indico.particle.mephi.ru/event/4/contributions/690/ LOCATION:Milan Hotel Rossini URL:https://indico.particle.mephi.ru/event/4/contributions/690/ END:VEVENT BEGIN:VEVENT SUMMARY:Graviton mass evaluation with trajectories of bright stars at the Galactic Center DTSTART;VALUE=DATE-TIME:20161011T103000Z DTEND;VALUE=DATE-TIME:20161011T104500Z DTSTAMP;VALUE=DATE-TIME:20260814T145356Z UID:indico-contribution-94-521@cern.ch DESCRIPTION:Speakers: Alexander Zakharov (leading researcher)\nIn the\npap ers reporting about this discovery\, the joint LIGO \\&\nVIRGO team presen ted an upper limit on graviton mass such as $m_g \n\nhttps://indico.partic le.mephi.ru/event/4/contributions/521/ LOCATION:Milan Hotel Rossini URL:https://indico.particle.mephi.ru/event/4/contributions/521/ END:VEVENT BEGIN:VEVENT SUMMARY:How to make nonlinear gravity with a scalar field DTSTART;VALUE=DATE-TIME:20161011T114500Z DTEND;VALUE=DATE-TIME:20161011T120500Z DTSTAMP;VALUE=DATE-TIME:20260814T145356Z UID:indico-contribution-94-518@cern.ch DESCRIPTION:Speakers: Sergey Rubin (MEPhI)\nReduction mechanism of a scala r field insertion into a Lagrangian of nonlinear gravity is proposed. Equi valence between nonlinear gravity with two extra space and nonlinear gravi ty with an extra space plus a scalar field is studied. The scalar field ma ss depends on properties of a smaller extra space.\n\nhttps://indico.parti cle.mephi.ru/event/4/contributions/518/ LOCATION:Milan Hotel Rossini URL:https://indico.particle.mephi.ru/event/4/contributions/518/ END:VEVENT BEGIN:VEVENT SUMMARY:The screening Horndeski cosmologies DTSTART;VALUE=DATE-TIME:20161011T104500Z DTEND;VALUE=DATE-TIME:20161011T110000Z DTSTAMP;VALUE=DATE-TIME:20260814T145356Z UID:indico-contribution-94-506@cern.ch DESCRIPTION:Speakers: Sergey Sushkov (Kazan Federal University)\nWe presen t a systematic analysis of homogeneous and isotropic cosmologies in a p articular Horndeski model with Galileon shift symmetry\, containing also a $\\Lambda$-term and a matter. The model\, sometimes called Fab Five\, adm its a rich spectrum of solutions. Some of them describe the standard late time cosmological dynamic dominated by the $\\Lambda$-term and matter\, w hile at the early times the universe expands with a constant Hubble rate d etermined by the value of the scalar kinetic coupling. For other solution s the $\\Lambda$-term and matter are screened at all times but there are nevertheless the early and late accelerating phases. The model also adm its bounces\, as well as peculiar solutions describing ``the emergence of time''. Most of these solutions contain ghosts in the scalar and tensor se ctors. However\, a careful analysis reveals three different branches of gh ost-free solutions\, all showing a late time acceleration phase. We analys e the dynamical stability of these\nsolutions and find that all of them ar e stable in the future\, since all their perturbations stay bounded at lat e times. However\, they all turn out to be unstable in the past\, as their perturbations grow violently when one approaches the initial spacetime singularity. We therefore conclude that the model has no viable solutions describing the whole of the cosmological history\, although it may descri be the current\nacceleration phase. We also check that the flat space solu tion is ghost-free in the model\, but it may acquire ghost in more general versions of the Horndeski theory.\n\nhttps://indico.particle.mephi.ru/eve nt/4/contributions/506/ LOCATION:Milan Hotel Rossini URL:https://indico.particle.mephi.ru/event/4/contributions/506/ END:VEVENT BEGIN:VEVENT SUMMARY:Global geometry of the Vaidya metric DTSTART;VALUE=DATE-TIME:20161011T101500Z DTEND;VALUE=DATE-TIME:20161011T103000Z DTSTAMP;VALUE=DATE-TIME:20260814T145356Z UID:indico-contribution-94-494@cern.ch DESCRIPTION:Speakers: Vyacheslav Dokuchaev (Institute for Nuclear Research of the Russian Academy of Sciences)\nWe find the exact analytical express ions for metric functions of the classical Vaidya metric in the diagonal c oordinates in the case of the linear mass function. By using these coordin ates\, we elaborate the maximum analytic extension of the Vaidya metric wi th a linear growth of the black hole mass and construct the corresponding Carter-Penrose diagrams for different specific cases. The derived global g eometry seemingly is valid also for a more general behavior of the black h ole mass in the Vaidya metric.\n\nhttps://indico.particle.mephi.ru/event/4 /contributions/494/ LOCATION:Milan Hotel Rossini URL:https://indico.particle.mephi.ru/event/4/contributions/494/ END:VEVENT END:VCALENDAR