Runaway Dilaton and Equivalence Principle Violations
نویسندگان
چکیده
منابع مشابه
Runaway dilaton and equivalence principle violations.
In a recently proposed scenario, where the dilaton decouples while cosmologically attracted towards infinite bare string coupling, its residual interactions can be related to the amplitude of density fluctuations generated during inflation, and are large enough to be detectable through a modest improvement on present tests of free-fall universality. Provided it has significant couplings to eith...
متن کاملViolations of the equivalence principle in a dilaton - runaway scenario
We explore a version of the cosmological dilaton-fixing and decoupling mechanism in which the dilaton dependence of the low-energy effective action is extremized for infinitely large values of the bare string coupling gs 5ef. We study the efficiency with which the dilaton f runs away toward its ‘‘fixed point’’ at infinity during a primordial inflationary stage, and thereby approximately decoupl...
متن کاملCouplings of a Light Dilaton and Violations of the Equivalence Principle
Experimental discovery of the dilaton would provide strong evidence for string theory. A light dilaton could show up in current tests of the inverse square law for gravity at sub-millimeter distances. In the large extra dimension scenario, KaluzaKlein excitations of the dilaton can also contribute to the cooling of supernovae. In order to quantify these effects we compute the couplings of a low...
متن کاملDecoherence–induced violations of Einstein equivalence principle
In this essay it will be shown that Decoherence Model and Einstein Equivalence Principle are conceptually incompatible. In other words, assuming only the validity of the Weak Equivalence Principle the present work concludes that we face two possibilities: (i) if Decoherence Model provides a correct description of nature at quantum level, then there are systems which violate Local Position Invar...
متن کاملViolation of the Equivalence Principle in String Dilaton Theories
We study violations of the weak equivalence principle in the context of string dilaton theories. In these models some fundamental constants become spaceas well as time-dependent. We show that although universality of free fall (UFF) experiments set bounds on parameters that govern the cosmological evolution of the scalar fields, these are strongly relaxed when considering the space dependent be...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2002
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.89.081601