Zobrazeno 1 - 10
of 51
pro vyhledávání: '"De Filippo, Sergio"'
Autor:
De Filippo, Sergio, Naddeo, Adele
A detailed and updated review is given of De Filippo's Non-unitary $4$-th Derivative Gravity and its Newtonian limit, by pointing out the crucial role of non-unitarity in addressing transition to classicality and specifically localization of macrosco
Externí odkaz:
http://arxiv.org/abs/2010.10400
Publikováno v:
IJQI Vol. 17, No. 8 (2019) 1941006
The quest for a microscopic foundation of Thermodynamics is addressed within the Nonunitary Newtonian Gravity model through the study of a specific closed system, namely a three-dimensional harmonic nanocrystal. A numerical calculation of the nanocry
Externí odkaz:
http://arxiv.org/abs/1910.01744
Autor:
De Filippo, Sergio
Semiclassical Gravity replaces the energy momentum tensor $T_{\mu \nu}$ with its expectation value $\langle T_{\mu \nu}\rangle$ in Einstein equations, this making the Einstein tensor $G_{\mu \nu}$ a classical variable thus avoiding the quantization o
Externí odkaz:
http://arxiv.org/abs/1807.10469
Autor:
De Filippo, Sergio, Maimone, Filippo
Publikováno v:
Entropy 6:153,2004
The localizing properties and the entropy production of the Newtonian limit of a nonunitary version of fourth order gravity are analyzed. It is argued that pure highly unlocalized states of the center of mass motion of macroscopic bodies rapidly evol
Externí odkaz:
http://arxiv.org/abs/quant-ph/0403162
Autor:
De Filippo, Sergio, Maimone, Filippo
A class of non-Markoffian nonunitary models for Newtonian gravity is characterized as following from some rather natural hypotheses. One of such models was previously obtained as the Newtonian limit of a classically stable version of higher derivativ
Externí odkaz:
http://arxiv.org/abs/gr-qc/0402008
Autor:
De Filippo, Sergio, Maimone, Filippo
Publikováno v:
Phys.Lett. B584 (2004) 141-146
Nonunitary versions of Newtonian gravity leading to wavefunction localization admit natural special-relativistic generalizations. They include the first consistent relativistic localization models. At variance with the unified model of localization a
Externí odkaz:
http://arxiv.org/abs/hep-th/0306223
Publikováno v:
Physica A330 (2003) 459-468
The localization of a quantum state is numerically exhibited in a nonunitary Newtonian model for gravity. It is shown that an unlocalized state of a ball of mass just above the expected threshold of 10^11 proton masses evolves into a mixed state with
Externí odkaz:
http://arxiv.org/abs/quant-ph/0306117
Autor:
Maimone, Filippo, De Filippo, Sergio
Publikováno v:
AIP Conf.Proc. 643 (2003) 379-384
It is shown that the Newtonian limit of a stable realization of HD gravity leads to a sharp transition, around 10^{11} proton masses, from the wavelike properties of microscopic particles to the classical behaviour of macroscopic bodies. Besides, due
Externí odkaz:
http://arxiv.org/abs/gr-qc/0207063
Autor:
De Filippo, Sergio, Maimone, Filippo
Publikováno v:
AIP Conf.Proc. 643 (2003) 373-378
Classical instability in fourth order gravity is cured at the expense of unitarity. The appearance of hidden degrees of freedom replicating those of ordinary matter allows for ordinary thermodynamic entropy and black hole entropy to be identified wit
Externí odkaz:
http://arxiv.org/abs/gr-qc/0207059
Autor:
De Filippo, Sergio, Maimone, Filippo
Publikováno v:
Phys.Rev.D66:044018,2002
Runaway solutions can be avoided in fourth order gravity by a doubling of the matter operator algebra with a symmetry constraint with respect to the exchange of observable and hidden degrees of freedom together with the change in sign of the ghost an
Externí odkaz:
http://arxiv.org/abs/gr-qc/0207053