Imperial College London

Carlo R. Contaldi

Faculty of Natural SciencesDepartment of Physics

Professor of Theoretical Physics



+44 (0)20 7594 1527c.contaldi




505Huxley BuildingSouth Kensington Campus






BibTex format

author = {Nagy, JM and Ade, PAR and Amiri, M and Benton, SJ and Bergman, AS and Bihary, R and Bock, JJ and Bond, JR and Bryan, SA and Chiang, HC and Contaldi, CR and Dore, O and Duivenvoorden, AJ and Eriksen, HK and Farhang, M and Filippini, JP and Fissel, LM and Fraisse, AA and Freese, K and Galloway, M and Gambrel, AE and Gandilo, NN and Ganga, K and Gudmundsson, JE and Halpern, M and Hartley, J and Hasselfield, M and Hilton, G and Holmes, W and Hristov, VV and Huang, Z and Irwin, KD and Jones, WC and Kuo, CL and Kermish, ZD and Li, S and Mason, PV and Megerian, K and Moncelsi, L and Morford, TA and Netterfield, CB and Nolta, M and Padilla, IL and Racine, B and Rahlin, AS and Reintsema, C and Ruhl, JE and Runyan, MC and Ruud, TM and Shariff, JA and Soler, JD and Song, X and Trangsrud, A and Tucker, C and Tucker, RS and Turner, AD and Van, Der List JF and Weber, AC and Wehus, IK and Wiebe, DV and Young, EY},
doi = {1538-4357/aa7cfd},
journal = {Astrophysical Journal},
title = {A New Limit on CMB Circular Polarization from SPIDER},
url = {},
volume = {844},
year = {2017}

RIS format (EndNote, RefMan)

AB - We present a new upper limit on cosmic microwave background (CMB) circular polarization from the 2015 flight of Spider, a balloon-borne telescope designed to search for B-mode linear polarization from cosmic inflation. Although the level of circular polarization in the CMB is predicted to be very small, experimental limits provide a valuable test of the underlying models. By exploiting the nonzero circular-to-linear polarization coupling of the half-wave plate polarization modulators, data from Spider's 2015 Antarctic flight provide a constraint on Stokes V at 95 and 150 GHz in the range $33\lt {\ell }\lt 307$. No other limits exist over this full range of angular scales, and Spider improves on the previous limit by several orders of magnitude, providing 95% C.L. constraints on ${\ell }({\ell }+1){C}_{{\ell }}^{{VV}}/(2\pi )$ ranging from 141 to 255 μK2 at 150 GHz for a thermal CMB spectrum. As linear CMB polarization experiments become increasingly sensitive, the techniques described in this paper can be applied to obtain even stronger constraints on circular polarization.
AU - Nagy,JM
AU - Ade,PAR
AU - Amiri,M
AU - Benton,SJ
AU - Bergman,AS
AU - Bihary,R
AU - Bock,JJ
AU - Bond,JR
AU - Bryan,SA
AU - Chiang,HC
AU - Contaldi,CR
AU - Dore,O
AU - Duivenvoorden,AJ
AU - Eriksen,HK
AU - Farhang,M
AU - Filippini,JP
AU - Fissel,LM
AU - Fraisse,AA
AU - Freese,K
AU - Galloway,M
AU - Gambrel,AE
AU - Gandilo,NN
AU - Ganga,K
AU - Gudmundsson,JE
AU - Halpern,M
AU - Hartley,J
AU - Hasselfield,M
AU - Hilton,G
AU - Holmes,W
AU - Hristov,VV
AU - Huang,Z
AU - Irwin,KD
AU - Jones,WC
AU - Kuo,CL
AU - Kermish,ZD
AU - Li,S
AU - Mason,PV
AU - Megerian,K
AU - Moncelsi,L
AU - Morford,TA
AU - Netterfield,CB
AU - Nolta,M
AU - Padilla,IL
AU - Racine,B
AU - Rahlin,AS
AU - Reintsema,C
AU - Ruhl,JE
AU - Runyan,MC
AU - Ruud,TM
AU - Shariff,JA
AU - Soler,JD
AU - Song,X
AU - Trangsrud,A
AU - Tucker,C
AU - Tucker,RS
AU - Turner,AD
AU - Van,Der List JF
AU - Weber,AC
AU - Wehus,IK
AU - Wiebe,DV
AU - Young,EY
DO - 1538-4357/aa7cfd
PY - 2017///
SN - 0004-637X
TI - A New Limit on CMB Circular Polarization from SPIDER
T2 - Astrophysical Journal
UR -
UR -
VL - 844
ER -