# PARAMETRIC TENSION BETWEEN EVEN AND ODD MULTIPOLE DATA OF THE WMAP POWER SPECTRUM: UNACCOUNTED CONTAMINATION OR MISSING PARAMETERS?

## Abstract

There exists power contrast in even and odd multipoles of the WMAP power spectrum at low and intermediate multipole ranges. This anomaly is explicitly associated with the angular power spectrum, which is heavily used for cosmological model fitting. Having noted this, we have investigated whether even (odd) multipole data set is individually consistent with the WMAP concordance model. Our investigation shows that the WMAP concordance model does not make a good fit for even (odd) multipole data set, which indicates parametric tension between even and odd multipole data set. Noting that tension is highest in primordial power spectrum parameters, we have additionally considered a running spectral index, but found that tension increases to even a higher level. We believe these parametric tensions may be indications of unaccounted contamination or imperfection of the model.

- Authors:

- Niels Bohr Institute and Discovery Center, Blegdamsvej 17, DK-2100 Copenhagen (Denmark)

- Publication Date:

- OSTI Identifier:
- 21452633

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Astrophysical Journal Letters; Journal Volume: 724; Journal Issue: 2; Other Information: DOI: 10.1088/2041-8205/724/2/L217

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BACKGROUND RADIATION; COSMOLOGICAL MODELS; DATA ANALYSIS; MULTIPOLES; SPECTRA; MATHEMATICAL MODELS; RADIATIONS

### Citation Formats

```
Kim, Jaiseung, and Naselsky, Pavel, E-mail: jkim@nbi.d.
```*PARAMETRIC TENSION BETWEEN EVEN AND ODD MULTIPOLE DATA OF THE WMAP POWER SPECTRUM: UNACCOUNTED CONTAMINATION OR MISSING PARAMETERS?*. United States: N. p., 2010.
Web. doi:10.1088/2041-8205/724/2/L217.

```
Kim, Jaiseung, & Naselsky, Pavel, E-mail: jkim@nbi.d.
```*PARAMETRIC TENSION BETWEEN EVEN AND ODD MULTIPOLE DATA OF THE WMAP POWER SPECTRUM: UNACCOUNTED CONTAMINATION OR MISSING PARAMETERS?*. United States. doi:10.1088/2041-8205/724/2/L217.

```
Kim, Jaiseung, and Naselsky, Pavel, E-mail: jkim@nbi.d. Wed .
"PARAMETRIC TENSION BETWEEN EVEN AND ODD MULTIPOLE DATA OF THE WMAP POWER SPECTRUM: UNACCOUNTED CONTAMINATION OR MISSING PARAMETERS?". United States.
doi:10.1088/2041-8205/724/2/L217.
```

```
@article{osti_21452633,
```

title = {PARAMETRIC TENSION BETWEEN EVEN AND ODD MULTIPOLE DATA OF THE WMAP POWER SPECTRUM: UNACCOUNTED CONTAMINATION OR MISSING PARAMETERS?},

author = {Kim, Jaiseung and Naselsky, Pavel, E-mail: jkim@nbi.d},

abstractNote = {There exists power contrast in even and odd multipoles of the WMAP power spectrum at low and intermediate multipole ranges. This anomaly is explicitly associated with the angular power spectrum, which is heavily used for cosmological model fitting. Having noted this, we have investigated whether even (odd) multipole data set is individually consistent with the WMAP concordance model. Our investigation shows that the WMAP concordance model does not make a good fit for even (odd) multipole data set, which indicates parametric tension between even and odd multipole data set. Noting that tension is highest in primordial power spectrum parameters, we have additionally considered a running spectral index, but found that tension increases to even a higher level. We believe these parametric tensions may be indications of unaccounted contamination or imperfection of the model.},

doi = {10.1088/2041-8205/724/2/L217},

journal = {Astrophysical Journal Letters},

number = 2,

volume = 724,

place = {United States},

year = {Wed Dec 01 00:00:00 EST 2010},

month = {Wed Dec 01 00:00:00 EST 2010}

}