89 research outputs found
A SEARCH FOR QSOS TO FIT A COSMOLOGICAL MODEL WITH FLAT, CLOSED SPATIAL SECTIONS
No full textUNIV ESTADUAL PAULISTA,INST FIS TEOR,RUA PAMPLONA 145,BR-01405 SAO PAULO,SP,BRAZILUNIV ESTADUAL PAULISTA,INST FIS TEOR,RUA PAMPLONA 145,BR-01405 SAO PAULO,SP,BRAZI
PSEUDOGRAVITATIONAL NONMINIMALLY COUPLED THEORIES
No full textUNIV ESTADUAL PAULISTA,INST FIS TEOR,RUA PAMPLONA 145,BR-01405 SAO PAULO,SP,BRAZILUNIV ESTADUAL PAULISTA,INST FIS TEOR,RUA PAMPLONA 145,BR-01405 SAO PAULO,SP,BRAZI
Search for 2νββ decay of ^(136)Xe to the 0^+^1 excited state of ^(136)Ba with the EXO-200 liquid xenon detector
No full textEXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of ^(136)Xe to the ground state of ^(136)Ba. We report here on a search for the two-neutrino ββ decay of 136Xe to the first 0+ excited
state, 0^+_1, of ^(136)Ba based on a 100 kg yr exposure of ^(136)Xe. Using a specialized analysis employing a machine
learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7 × 10^(24) yr. We find no statistically significant evidence for the 2νββ decay to the excited state resulting in a lower limit of T^(2ν)_(1/2)(0^+ → 0^+_1) > 6.9 ×10^(23) yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5 × 10^(25) yr
CLASSICAL EQUIVALENCE OF LAMBDA-R-PHI-2 THEORIES
No full textIt is shown that the action functional S[g, phi] = integral d4 x square-root -g[R/k(1 + klambdaphi2) + partial derivative(mu)phi partial derivative(mu)phi] describes, in general, one and the same classical theory whatever may be the value of the coupling constant lambda.UNIV ESTADUAL PAULISTA,INST FIS TEOR,RUA PAMPLONA 145,BR-01405 SAO PAULO,BRAZILUNIV ESTADUAL PAULISTA,INST FIS TEOR,RUA PAMPLONA 145,BR-01405 SAO PAULO,BRAZI
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