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BEGIN:VEVENT
DTSTAMP:20261012T180433Z
LAST-MODIFIED:20160922T153349Z
DTSTART:20161005T161000Z
DTEND:20161005T171000Z
UID:event1662@bu.edu
URL:http://physics.bu.edu/internal/events/show/1662
SUMMARY:Dark Sector: A Tale of Two Components
DESCRIPTION:Featuring Manuel Buen Abad Najar\n\nPart of the Preliminary Ora
	l Exam.\n\nExamining Committee: Martin Schmaltz\, Emanuel Katz\, Claudio Ch
	amon\, Edward Kearns (Chair)\n\nAbstract: \n\nThe recent measurements of th
	e Cosmic Microwave Background (CMB) from the Planck telescope\, and of the 
	Large Scale Structure (LSS) from different experiments\, have confirmed t
	he\nstandard model of cosmology\, or ΛCDM. Nevertheless\, many alternative
	 cosmological models are\nalso consistent with this data. Some mild tension
	s between Planck and these LSS experiments\nabout the measurements of the H
	ubble constant (H0) and of the Matter Power Spectrum for sizes of 8h−1Mpc
	 (σ8) hint to models beyond ΛCDM.\n\nIn this talk I present a recent prop
	osal for a Dark Sector which consists of two components:\na cold Dark Matte
	r one\, and another of Dark Radiation\, along with their mutual interaction
	s.\nThe presence of the Dark Radiation resolves the tension in the measurem
	ent of H0\, while the\ninteractions address the discrepancy in σ8.\n\nI de
	scribe in detail the mechanism with which this model deals with the mention
	ed tensions\,\nusing the equations for the evolution of the cosmological an
	isotropies. In addition\, I present a\nsimple analytical solution for the l
	imit case in which the Dark Matter and the Dark Radiation\nform a tightly c
	oupled plasma throughout the history of the Universe. Finally\, I show that
	 the fit\nof this new model to the cosmological data is better than ΛCDM�
	��s.\n\n![Manuel](/resources/event-image/1662/8035da2_original)
LOCATION:PRB 261\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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