Experimental Probe of Inflationary Cosmology (comparison of three EPIC versions)

Experimental Probe of InflationaryCosmology

(comparison of three EPIC versions)

Asantha CoorayUniversity of California-Irvine

Post-Planck Mission Effort in US

Observable WMAP Planck EPIC

TT 530(1) 1750(2) 3700

TE 900(2) 2700

EE 2600

BB (lensing) 1850(1) Nolta et al. 2008 (2) HFI, based on Planck Blue Book

Deliverables

The ell to which measurements are cosmic variance limited

Before EPIC-IM (2008): EPIC-LC and EPIC-CS

EPIC (LC) Low-Cost Option

Science Science Requirements Instrument

GW <BB> Detect both l = 5 & l = 100 <BB> bumps at r = 0.01after Galactic foreground removal

1º FWHM @100 GHzAll sky2 μK√s2 years

30 – 300 GHz

EPIC (CS) Comprehensive Science Option

Science Science Requirements Instrument

GW <BB>

Lensing <BB>

<EE>

Detect both l = 5 & l = 100 <BB> bumps at r = 0.001after Galactic foreground removal

Measure lensing <BB> to cosmic variance to l = 1000Potential to subtract lensing <BB>

Measure <EE> to cosmic variance into the damping tail

5' FWHM @100 GHzAll sky2 μK√s2 years

30 – 300 GHz

Phase I: Two mission options

EPIC-IM (2008/2009 version)

EPIC=EPIC IMEPIC CS = Cosmic variance

This is enabled by the cosmic variance limited E-mode measurement.

Last word on the “Age question”

Our final age determination

will be accurate to 25

Myrs.

Inflationary Parameters

Quantity Discoverer WMAP Error with

PlanckError with

EPIC

Amplitude of density perturbations

COBE

Scalar spectral index WMAP

Running of the spectral index

Planck?

Inflationary Gravitational Waves

EPIC?

IGW spectral index ?

Running of the IGW index ?

Primordial non-Gaussianity ? 32 +/- 21 5 2

Amplitude of the inflationary gravitational waves depends only on the energy scale of inflation. Interpretation is NOT model-dependent.

The information captured by the inflationary gravitational wave background is unique, it cannot be obtained even with a perfect measurement of the scalar spectral index and its running.

LensedUnlensed

Difference Foreground Mass

Lensing studieswith EPIC

11

Theoretical projectedpotential

Optimal Quadratic (Hu 2001)

Likelihood(Hirata & Seljak 2003)

All Sky Maps of Projected Gravitational Potential

Gravitational potential determined from CMB polarization and temperature mapssensitive to

- neutrino masses- dark energy

All-sky potential map: maps to cosmic limits on the whole sky!- a legacy for every future study of structure formation

8º

Measuring the lensing power spectrum

NET muK/sqrt(sec) one-year

Lensing Removal and the Search for Gravitational-wave B-modes

What is the optimal resolution for lens de-cleaning?

~4 arcmins is the ideal beam size

Scientific Gain =(T/S-limit with lens cleaning)/(without cleaning)

Beam

incr

easi

ng

Particle physics application of EPIC

Lensing B-modes and CMB Cosmic Shear Reconstruction

neutrino mass (Σmν < 0.05 eV; from the linear regime)

Test SuperK Atmosphere oscillations that suggest Δmν

∼2x10-3 eV2

and distinguish between two mass hierarchies

CMB lensing probes linear fluctuationsSource properties known(Both these lead to systematicerrors in galaxy lensing)

EPIC can not only measure the total sum of neutrino masses, but when combined with atmospheric oscillation result for the mass-squared difference, establish individual masses of all three neutrino species.

Better than (<) 6 arcmin resolution is a requirement for EPIC to enable CMB lensing studies.

The measurement cannot be achieved with a lensing analysis in a small patch of the sky. All-sky coverage is essential.

What is the neutrino mass hierarchy?

Did dark energy exist at z> 2?

In some models of dark energy, a small contribution exist to the total energy density budget of the Universe at z >2.

CMB lensing probes cosmology at z of 2 to 4, where the lensing efficiency is highest.

EPIC can constrain the early dark energy density to better than 0.1%.

(Half-sky weak lensing with planned Euclid can only constrain same down to 2.5%. JDEM with 4000 deg2, down to 7.5%)

When and how did the Universe reionize?

Astrophysics Measurement

Reionization history

Model-dependent constraints

Reionization history

Model-independent constraints

EPIC allows cosmic variance extraction of 5 components.

21

Mapping Galactic Magnetic Fields over the Whole Sky

Map of full sky with σP < 0.3 %

Planck

EPIC-IM

Mission BandGHz

FWHMarcmin

σ(Q)kJy/sr/beam

Pol. depthAV

Planck 350 5 24 4

EPIC-IM500 2 0.9 0.06

850 1 0.7 0.01How does large-scale Galactic field relatedto field in embedded star-forming regions?

Summary