GL2 - Statistics and Geometry of Weak Lensing Data |
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Speaker |
Flambaum, Victor |
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Coauthors |
Stadnik, Yevgeny |
| Talk Title |
Searching for dark matter with non-gravitational lensing |
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Abstract |
We propose new schemes for the detection of topological defect dark matter (which are stable, extended-in-space dark matter objects that include monopoles, cosmic strings and domain walls). Networks of topological defects are believed to have assisted in observed cosmological structure formation. The dark matter field inside a topological defect may interact with the photon field, altering the photon dispersion relation inside a defect and making a defect function as a cosmic dielectric material with a distinctive frequency-dependent index of refraction. One can search for the time delay of a periodic extraterrestrial light or radio signal, and the dispersion of cosmic radiation (Rainbow effect) caused by topological defects. Such frequency-dependent, non-gravitational lensing is distinct from gravitational lensing, which is a frequency-independent effect. Existing pulsar timing data in association with the pulsar glitch phenomenon may already contain hints of topological defects through other non-gravitational effects associated with the interaction of the dark matter field(s) inside a topological defect with the neutron and other fermions. Our proposed detection methods are complementary to recently proposed laboratory detection schemes for topological defects. References: [1] Y. V. Stadnik and V. V. Flambaum. Phys. Rev. Lett. 113, 151301 (2014). [2] M. Pospelov, S. Pustelny, M. P. Ledbetter, D. F. Jackson Kimball, W. Gawlik, and D. Budker. Phys. Rev. Lett. 110, 021803 (2013). [3] A. Derevianko and M. Pospelov. Nature Physics 10, 933 (2014). [4] Y. V. Stadnik and V. V. Flambaum. Phys. Rev. Lett. 114, 161301 (2015). |
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