The Twisted Universe: the cosmic quest to reveal which end is up - Brian...
Δημοσιεύτηκε στις 29 Απρ 2016
The
cosmic microwave background (CMB) has spectacularly advanced our
understanding of the origin, composition, and evolution of our universe.
Yet there is still much to glean from this, the oldest light in the
universe. Powerful telescopes are plying the skies in a quest to
discover new physics. This talk concentrates on measurements by
cutting-edge CMB telescopes which offer a glimpse into an exhilarating,
and largely unexplored branch of astrophysics: the search for unique
signatures in the polarization of the CMB. Professor Keating will
explain how the CMB can constrain phenomena such as primordial
magnetism, elementary particle masses, and even the origin of the
universe itself. Further phenomena, such as tantalizing bounds on
parity-violating effects such as cosmic birefringence — the rotation of
the polarization plane of cosmic photons — will be discussed. He will
describe early attempts to measure cosmic parity violation using distant
galaxies as well as state-of the-art measurements made by the POLARBEAR
telescope, which he co-leads. He will close by previewing the upcoming
Simons Array, an advanced array of three millimeter-wave CMB telescopes
in the Atacama Desert of Northern Chile.
cosmic microwave background (CMB) has spectacularly advanced our
understanding of the origin, composition, and evolution of our universe.
Yet there is still much to glean from this, the oldest light in the
universe. Powerful telescopes are plying the skies in a quest to
discover new physics. This talk concentrates on measurements by
cutting-edge CMB telescopes which offer a glimpse into an exhilarating,
and largely unexplored branch of astrophysics: the search for unique
signatures in the polarization of the CMB. Professor Keating will
explain how the CMB can constrain phenomena such as primordial
magnetism, elementary particle masses, and even the origin of the
universe itself. Further phenomena, such as tantalizing bounds on
parity-violating effects such as cosmic birefringence — the rotation of
the polarization plane of cosmic photons — will be discussed. He will
describe early attempts to measure cosmic parity violation using distant
galaxies as well as state-of the-art measurements made by the POLARBEAR
telescope, which he co-leads. He will close by previewing the upcoming
Simons Array, an advanced array of three millimeter-wave CMB telescopes
in the Atacama Desert of Northern Chile.
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