Supernovae as Probes of Extra Dimensions
نویسندگان
چکیده
Since the dawn of the new millennium, there has been a revived interest in the concept of extra dimensions. In this scenario all the standard model matter and gauge fields are confined to the 4 dimensions and only gravity can escape to higher dimensions of the universe. This idea can be tested using table-top experiments, collider experiments, astrophysical or cosmological observations. The main astrophysical constraints come from the cooling rate of supernovae, neutron stars, red giants and the sun. In this article, we consider the energy loss mechanism of SN1987A and study the constraints it places on the number and size of extra dimensions and the higher dimensional Planck scale.
منابع مشابه
Weakly Warped Extra Dimensions and SN1987A
The neutrino pulse from SN1987A provides one of the most rigourous constraints on models of extra dimensions. Previously, calculations have been done to bound the size of these extra dimensions in the case when the metric was factorizable. Here we consider the case of 2 ‘weakly warped’ extra dimensions. We find that even though weak warping seems only to affect the zero mode this can have a mea...
متن کاملTime variation of G and α within models with extra dimensions
We derive the formulae for the time variation of the gravitational " constant " G and of the fine structure " constant " α in various models with extra dimensions and analyze their consistency with the available observational data for distant supernovae. We find that the reported variation of α translates into a small variation of G that makes distant supernovae to appear brighter, in contradic...
متن کاملSupernovae, CMB, and Gravitational Leakage into Extra Dimensions
We discuss observational constraints coming from CMB and type Ia supernovae, for the model of accelerated universe produced by gravitational leakage into extra dimensions. Our fits indicate that the model is currently in agreement with the data. We also give the equations governing the evolution of cosmological perturbations. Future observations will be able to severely constrain the model.
متن کاملAccelerating universe from gravitational leakage into extra dimensions: confrontation with SNeIa
There is mounting observational evidence that the expansion of our universe is undergoing an acceleration. A dark energy component has usually been invoked as the most feasible mechanism for the acceleration. However, it is desirable to explore alternative possibilities motivated by particle physics before adopting such an untested entity. In this work, we focus our attention on an acceleration...
متن کاملNeutrinos in Extra Dimensions and Supernovae
Models with extra space dimensions naturally provide for the existence of fermions that propagate in them. These are seen in 4D as an infinite tower of sterile neutrinos possibly mixed with the Standard Model ones. We consider the effect of such a mixing in the context of core collapse supernova physics. We show that the potentially dramatic modifications to the supernova evolution (commonly be...
متن کامل