?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Cosmology+with+a+SKA+HI+intensity+mapping+survey&rft.creator=Santos%2C+MG&rft.creator=Bull%2C+P&rft.creator=Alonso%2C+D&rft.creator=Camera%2C+S&rft.creator=Ferreira%2C+PG&rft.creator=Bernardi%2C+G&rft.creator=Maartens%2C+R&rft.creator=Viel%2C+M&rft.creator=Villaescusa-Navarro%2C+F&rft.creator=Abdalla%2C+FB&rft.creator=Jarvis%2C+M&rft.creator=Metcalf%2C+RB&rft.creator=Pourtsidou%2C+A&rft.creator=Wolz%2C+L&rft.description=HI+intensity+mapping+(IM)+is+a+novel+technique+capable+of+mapping+the+large-scale+structure+of+the+Universe+in+three+dimensions+and+delivering+exquisite+constraints+on+cosmology%2C+by+using+HI+as+a+biased+tracer+of+the+dark+matter+density+field.+This+is+achieved+by+measuring+the+intensity+of+the+redshifted+21cm+line+over+the+sky+in+a+range+of+redshifts+without+the+requirement+to+resolve+individual+galaxies.+In+this+chapter%2C+we+investigate+the+potential+of+SKA1+to+deliver+HI+intensity+maps+over+a+broad+range+of+frequencies+and+a+substantial+fraction+of+the+sky.+By+pinning+down+the+baryon+acoustic+oscillation+and+redshift+space+distortion+features+in+the+matter+power+spectrum+--+thus+determining+the+expansion+and+growth+history+of+the+Universe+--+these+surveys+can+provide+powerful+tests+of+dark+energy+models+and+modifications+to+General+Relativity.+They+can+also+be+used+to+probe+physics+on+extremely+large+scales%2C+where+precise+measurements+of+spatial+curvature+and+primordial+non-Gaussianity+can+be+used+to+test+inflation%3B+on+small+scales%2C+by+measuring+the+sum+of+neutrino+masses%3B+and+at+high+redshifts+where+non-standard+evolution+models+can+be+probed.+We+discuss+the+impact+of+foregrounds+as+well+as+various+instrumental+and+survey+design+parameters+on+the+achievable+constraints.+In+particular+we+analyse+the+feasibility+of+using+the+SKA1+autocorrelations+to+probe+the+large-scale+signal.&rft.subject=astro-ph.CO%2C+astro-ph.CO%2C+astro-ph.IM%2C+gr-qc&rft.date=2015-05-28&rft.type=Proceedings+paper&rft.language=eng&rft.source=+++++In%3A++Advancing+Astrophysics+with+the+Square+Kilometre+Array.++++%3A+Giardini+Naxos+(Italy).+(2015)+++++&rft.format=text&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F1523701%2F1%2FAbdalla_1501.03989v1.pdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F1523701%2F&rft.rights=open