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Physics Department Sharif University of Technology Cosmology Group Weekly Seminars |
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Cosmic voids are emptier in the presence of symmetron’s domain walls
Bahar Nosrati
Department of Physics, Shahid Beheshti University
Abstract:
The symmetron field has an environment (density) dependent behavior which is a common feature of the models with the screening mechanism and results in a rich phenomenology. This model can produce domain walls between regions with different densities. We consider this aspect and study the physics of domain walls in between (underdensity) voids and (overdensity) halo structures. The (spherical) domain walls exert a repulsive force on a test mass outside of the wall while a test mass inside of the wall sees no force. This makes the structures outside the voids go further to a larger radius. Effectively, this means the voids are becoming larger in this scenario in comparison to the standard model of cosmology. Interestingly, this makes voids emptier which may shed light on Peebles’ void phenomenon.
یکشنبه 25 دی 1401، ساعت 17:00
Sunday 15 January 2023 – 17:00 Tehran Time
Hybrid Seminar
آمفی تئاتر دانشکده فیزیک-تالار جنابPhysics Department – Amphitheater- Jenab Hall/
https://vc.sharif.edu/ch/cosmology
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