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SUMMARY:Finding holes in the Vainshtein screen
DTSTART;VALUE=DATE-TIME:20151123T113000Z
DTEND;VALUE=DATE-TIME:20151123T123000Z
DTSTAMP;VALUE=DATE-TIME:20260604T051225Z
UID:indico-event-2612@indico.ific.uv.es
DESCRIPTION:The discovery of the accelerated expansion of the universe has
  motivated an intense activity in infrarred modifications of gravity with 
 an additional scalar degree of freedom. This scalar is then used to replac
 e the cosmological constant as the responsible for the cosmic acceleration
 . A common problem in these models is that this scalar must be very light 
 to have cosmological effects today. However\, it typically mediates a long
 -range force that has not been observed in local gravity tests and this se
 verely constraints such models. A resolution to this problem came about wi
 th the implementation of screening mechanism that allow to avoid local gra
 vity tests while still having relevant cosmological effects. I will review
  some models featuring the different screening mechanism existing in the l
 iterature and how they work to evade local gravity tests. I will pay speci
 al attention to the so-called Vainshtein mechanism (present in Galileon/Ho
 rndeski theories and massive gravity...) and argue how the cosmological ev
 olution of the field can induce non-screenable effects in local gravity ob
 servables\, mainly a time-variation in Newton's constant and an anomalous 
 propagation speed of gravitational waves. These effects are then constrain
 ed using solar system and binary pulsar constraints.\n\nhttps://indico.ifi
 c.uv.es/event/2612/
LOCATION:Campus Burjassot 4-4-4426 - Seminari Física Teòrica
URL:https://indico.ific.uv.es/event/2612/
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