skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Magnetic domain walls of relic fermions as Dark Energy

Abstract

We show that relic fermions of the Big Bang can enter a ferromagnetic state if they possess a magnetic moment and satisfy the requirements of Stoner theory of itinerant ferromagnetism. The domain walls of this ferromagnetism can successfully simulate Dark Energy over the observable epoch spanning {approx} 10 billion years. We obtain conditions on the anomalous magnetic moment of such fermions and their masses. Known neutrinos fail to satisfy the requirements thus pointing to the possibility of a new ultralight sector in Particle Physics.

Authors:
 [1]
  1. Department of Physics, Indian Institute of Technology, Bombay, Mumbai 400076 (India)
Publication Date:
OSTI Identifier:
20729213
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 805; Journal Issue: 1; Conference: PASCOS 2005: 11. international symposium on particles, strings, and cosmology, Gyeongju (Korea, Republic of), 30 May - 4 Jun 2005; Other Information: DOI: 10.1063/1.2149755; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DOMAIN STRUCTURE; FERROMAGNETISM; MAGNETIC MOMENTS; NEUTRINOS; NONLUMINOUS MATTER; REST MASS

Citation Formats

Yajnik, Urjit A. Magnetic domain walls of relic fermions as Dark Energy. United States: N. p., 2005. Web. doi:10.1063/1.2149755.
Yajnik, Urjit A. Magnetic domain walls of relic fermions as Dark Energy. United States. doi:10.1063/1.2149755.
Yajnik, Urjit A. Fri . "Magnetic domain walls of relic fermions as Dark Energy". United States. doi:10.1063/1.2149755.
@article{osti_20729213,
title = {Magnetic domain walls of relic fermions as Dark Energy},
author = {Yajnik, Urjit A.},
abstractNote = {We show that relic fermions of the Big Bang can enter a ferromagnetic state if they possess a magnetic moment and satisfy the requirements of Stoner theory of itinerant ferromagnetism. The domain walls of this ferromagnetism can successfully simulate Dark Energy over the observable epoch spanning {approx} 10 billion years. We obtain conditions on the anomalous magnetic moment of such fermions and their masses. Known neutrinos fail to satisfy the requirements thus pointing to the possibility of a new ultralight sector in Particle Physics.},
doi = {10.1063/1.2149755},
journal = {AIP Conference Proceedings},
number = 1,
volume = 805,
place = {United States},
year = {Fri Dec 02 00:00:00 EST 2005},
month = {Fri Dec 02 00:00:00 EST 2005}
}
  • Cited by 6
  • No abstract prepared.
  • Two mechanisms by which the quintessence scalar could enhance the relic abundance of dark matter particles are discussed. These effects can have an impact on supersymmetric candidates for dark matter.
  • Scalar-tensor theories of gravity provide a consistent framework to accommodate an ultralight quintessence scalar field. While the equivalence principle is respected by construction, deviations from general relativity and standard cosmology may show up at nucleosynthesis, cosmic microwave background, and solar system tests of gravity. After imposing all the bounds coming from these observations, we consider the expansion rate of the Universe at weakly interacting massive particle decoupling, showing that it can lead to an enhancement of the dark matter relic density up to few orders of magnitude with respect to the standard case. This effect can have an impact onmore » supersymmetric candidates for dark matter.« less
  • We investigate the interaction of fermions having both Dirac and left-handed and right-handed Majorana mass terms with vacuum domain walls. By solving the equations of motion in a thin-wall approximation, we calculate the reflection and transmission coefficients for the scattering of fermions off walls.