Monte Carlo Study on Distortion of the Space-Dimension in COBE Monopole Data

TL;DR

This study uses Monte Carlo analysis on cosmic microwave background data to constrain the space-dimension distortion, chemical potential, and SZ effect, finding very tight bounds consistent with standard cosmology.

Contribution

It provides the first detailed Monte Carlo limits on space-dimension distortion and related parameters in CMB data, including analysis with relativistic SZ effects.

Findings

Limits on chemical potential: |.9 imes 10^{-5}|

Limits on SZ y-parameter: |2.0 imes 10^{-6}|

Limits on space-dimension distortion: || < 6 imes 10^{-5}

Abstract

A concise explanation of studies on distortion of space-time dimension is briefly introduced. Second we obtain the limits (i.e., bounded values) of the dimensionless chemical potential $\mu$, the Sunyaev--Zeldovich (SZ) effect y and distortion of the space-dimension $\varepsilon$ by Monte Carlo (MC) analysis of the parameter set (T, $d=3+\varepsilon$, $\mu$, and $y$) in cosmic microwave data assuming that the SZ effect is positive (y>0). In this analysis, the magnitude of the space-dimension d with distortion of the space-dimension $\varepsilon$ is defined by $d=3+\varepsilon$. The limits of $\mu$ and $y$ are determined as $|\mu| < 9\times 10^{-5} (2\sigma$) ($\mu = (-3.9\pm 2.6)\times 10^{-5} (\sigma$)), $|y| < 5\times 10^{-6} (2\sigma$) ($y = (2.0\pm 1.4)\times 10^{-6} (\sigma$)), while the distortion of the space-dimension is $|\varepsilon| < 6\times 10^{-5} (2\sigma$) ($\varepsilon = (-0.78\pm 2.50)\times 10^{-5} (\sigma$)). The magnitudes of these three estimated limits are ordered as $|\mu| \ge |\varepsilon| > |y|$. The estimated limit of $|y| < 5\times 10^{-6}$ appears to be related to re-ionization processes occurring at redshift $z_{ri}\sim 10$. We also present data analysis assuming a relativistic SZ effect.