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Author |
Balbinot, R.; Fabbri, A. |
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Title |
Quantum correlations across the horizon in acoustic and gravitational black holes |
Type |
Journal Article |
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Year |
2022 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
105 |
Issue |
4 |
Pages |
045010 - 20pp |
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Abstract  |
We investigate, within the framework of quantum field theory in curved space, the correlations across the horizon of a black hole in order to highlight the particle-partner pair creation mechanism at the origin of Hawking radiation. The analysis concerns both acoustic black holes, formed by Bose-Einstein condensates, and gravitational black holes. More precisely, we have considered a typical acoustic black hole metric with two asymptotic homogeneous regions and the Schwarzschild metric as describing a gravitational black hole. By considering equal-time correlation functions, we find a striking disagreement between the two cases: the expected characteristic peak centered along the trajectories of the Hawking particles and their partners seems to appear only for the acoustic black hole and not for the gravitational Schwarzschild one. The reason for that is the existence of a quantum atmosphere displaced from the horizon as the locus of origin of Hawking radiation together, and this is the crucial aspect, with the presence of a central singularity in the gravitational case swallowing everything is trapped inside the horizon. Correlations, however, are not absent in the gravitational case; to see them, one simply has to consider correlation functions at unequal times, which indeed display the expected peak. |
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Address |
[Balbinot, Roberto] Univ Bologna, Dipartimento Fis, Bologna, Italy, Email: balbinot@bo.infn.it; |
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Publisher |
Amer Physical Soc |
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English |
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ISSN |
2470-0010 |
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Conference |
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Notes |
WOS:000761172600005 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5156 |
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Author |
Casals, M.; Fabbri, A.; Martinez, C.; Zanelli, J. |
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Title |
Quantum dress for a naked singularity |
Type |
Journal Article |
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Year |
2016 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
760 |
Issue |
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Pages |
244-248 |
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Keywords |
Semiclassical gravity; Quantum backreaction; Cosmic censorship; Black holes; Naked singularities; BTZ |
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Abstract |
We investigate semiclassical backreaction on a conical naked singularity space-time with a negative cosmological constant in (2 + 1)-dimensions. In particular, we calculate the renormalized quantum stress-energy tensor for a conformally coupled scalar field on such naked singularity space-time. We then obtain the backreacted metric via the semiclassical Einstein equations. We show that, in the regime where the semiclassical approximation can be trusted, backreaction dresses the naked singularity with an event horizon, thus enforcing (weak) cosmic censorship. |
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Address |
[Casals, Marc] Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil, Email: mcasals@cbpf.br; |
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Publisher |
Elsevier Science Bv |
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English |
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ISSN |
0370-2693 |
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Notes |
WOS:000382890500037 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2804 |
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Author |
Babichev, E.; Fabbri, A. |
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Title |
Stability analysis of black holes in massive gravity: A unified treatment |
Type |
Journal Article |
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Year |
2014 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
89 |
Issue |
8 |
Pages |
081502 - 5pp |
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Abstract |
We consider the analytic solutions of massive (bi) gravity which can be written in a simple form using advanced Eddington-Finkelstein coordinates. We analyze the stability of these solutions against radial perturbations. First we recover the previously obtained result on the instability of the bidiagonal bi-Schwarzschild solutions. In the nonbidiagonal case (which contains, in particular, the Schwarzschild solution with Minkowski fiducial metric), we show that generically there are physical spherically symmetric perturbations, but no unstable modes. |
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Address |
[Babichev, Eugeny; Fabbri, Alessandro] Univ Paris 11, Lab Phys Theor Orsay, F-91405 Orsay, France |
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Publisher |
Amer Physical Soc |
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English |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1550-7998 |
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Expedition |
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Conference |
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Notes |
WOS:000334335000001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1770 |
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Author |
Balbinot, R.; Fabbri, A. |
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Title |
Amplifying the Hawking Signal in BECs |
Type |
Journal Article |
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Year |
2014 |
Publication |
Advances in High Energy Physics |
Abbreviated Journal |
Adv. High. Energy Phys. |
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Volume |
2014 |
Issue |
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Pages |
713574 - 8pp |
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Abstract |
We consider simple models of Bosep-Einstein condensates to study analog pairp-creation effects, namely, the Hawking effect from acoustic black holes and the dynamical Casimir effect in rapidly timep-dependent backgrounds. We also focus on a proposal by Cornell to amplify the Hawking signal in density-density correlators by reducing the atoms' interactions shortly before measurements are made. |
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Address |
[Balbinot, Roberto; Fabbri, Alessandro] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy, Email: afabbri@ific.uv.es |
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Publisher |
Hindawi Publishing Corporation |
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Language |
English |
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Edition |
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ISSN |
1687-7357 |
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Notes |
WOS:000335740300001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1787 |
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Author |
Mauro, S.; Balbinot, R.; Fabbri, A.; Shapiro, I.L. |
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Title |
Fourth derivative gravity in the auxiliary fields representation and application to the black-hole stability |
Type |
Journal Article |
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Year |
2015 |
Publication |
European Physical Journal Plus |
Abbreviated Journal |
Eur. Phys. J. Plus |
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Volume |
130 |
Issue |
7 |
Pages |
135 - 8pp |
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Keywords |
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Abstract |
We consider an auxiliary fields formulation for the general fourth-order gravity on an arbitrary curved background. The case of a Ricci-flat background is elaborated in detail and it is shown that there is an equivalence with the standard metric formulation. At the same time, using auxiliary fields helps to make perturbations to look simpler and the results clearer. As an application we reconsider the linear perturbations for the classical Schwarzschild solution. We also briefly discuss the relation to the effect of massive unphysical ghosts in the theory. |
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Address |
[Mauro, Sebastiao; Shapiro, Ilya L.] Univ Fed Juiz de Fora, Dept Fis, ICE, BR-36036360 Juiz De Fora, MG, Brazil, Email: afabbri@ific.uv.es |
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Publisher |
Springer Heidelberg |
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English |
Summary Language |
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Series Issue |
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Edition |
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ISSN |
2190-5444 |
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Conference |
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Notes |
WOS:000358147100003 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2309 |
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Author |
Martone, G.I.; Larre, P.E.; Fabbri, A.; Pavloff, N. |
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Title |
Momentum distribution and coherence of a weakly interacting Bose gas after a quench |
Type |
Journal Article |
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Year |
2018 |
Publication |
Physical Review A |
Abbreviated Journal |
Phys. Rev. A |
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Volume |
98 |
Issue |
6 |
Pages |
063617 - 21pp |
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Keywords |
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Abstract |
We consider a weakly interacting uniform atomic Bose gas with a time-dependent nonlinear coupling constant. By developing a suitable Bogoliubov treatment we investigate the time evolution of several observables, including the momentum distribution, the degree of coherence in the system, and their dependence on dimensionality and temperature. We rigorously prove that the low-momentum Bogoliubov modes remain frozen during the whole evolution, while the high-momentum ones adiabatically follow the change in time of the interaction strength. At intermediate momenta we point out the occurrence of oscillations, which are analogous to Sakharov oscillations. We identify two wide classes of time-dependent behaviors of the coupling for which an exact solution of the problem can be found, allowing for an analytic computation of all the relevant observables. A special emphasis is put on the study of the coherence property of the system in one spatial dimension. We show that the system exhibits a smooth “light-cone effect,” with typically no prethermalization. |
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Address |
[Martone, Giovanni I.; Pavloff, Nicolas] Univ Paris Saclay, Univ Paris Sud, CNRS, LPTMS,UMR 8626, F-91405 Orsay, France |
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Publisher |
Amer Physical Soc |
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Language |
English |
Summary Language |
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Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
2469-9926 |
ISBN |
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Conference |
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Notes |
WOS:000452949900009 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
3841 |
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Author |
Boiron, D.; Fabbri, A.; Larre, P.E.; Pavloff, N.; Westbrook, C.I.; Zin, P. |
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Title |
Quantum Signature of Analog Hawking Radiation in Momentum Space |
Type |
Journal Article |
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Year |
2015 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
115 |
Issue |
2 |
Pages |
025301 - 5pp |
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Keywords |
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Abstract |
We consider a sonic analog of a black hole realized in the one-dimensional flow of a Bose-Einstein condensate. Our theoretical analysis demonstrates that one-and two-body momentum distributions accessible by present-day experimental techniques provide clear direct evidence (i) of the occurrence of a sonic horizon, (ii) of the associated acoustic Hawking radiation, and (iii) of the quantum nature of the Hawking process. The signature of the quantum behavior persists even at temperatures larger than the chemical potential. |
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Address |
[Boiron, D.; Westbrook, C. I.] Univ Paris Sud, CNRS, Inst Opt, Lab Charles Fabry, F-91127 Palaiseau, France, Email: afabbri@ific.uv.es; |
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Publisher |
Amer Physical Soc |
Place of Publication |
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English |
Summary Language |
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Series Issue |
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Edition |
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ISSN |
0031-9007 |
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Notes |
WOS:000357500500004 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
2294 |
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Author |
Balbinot, R.; Fabbri, A. |
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Title |
Quantum energy momentum tensor and equal time correlations in a Reissner-Nordström black hole |
Type |
Journal Article |
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Year |
2023 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
108 |
Issue |
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Pages |
045004 - 9pp |
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Keywords |
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Abstract |
We consider a Reissner-Nordström black hole formed by the collapse of a charged null shell. The renormalized expectation values of the energy-momentum tensor operator for a massless scalar field propagating in the two-dimensional section of this spacetime are given. We then analyze the across-the-horizon correlations of the related energy density operator for free-falling observers to reveal the correlations between the Hawking particles and their interior partners. |
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Notes |
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Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6093 |
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Author |
Coutant, A.; Fabbri, A.; Parentani, R.; Balbinot, R.; Anderson, P.R. |
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Title |
Hawking radiation of massive modes and undulations |
Type |
Journal Article |
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Year |
2012 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
86 |
Issue |
6 |
Pages |
064022 - 17pp |
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Keywords |
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Abstract |
We compute the analogue Hawking radiation for modes which possess a small wave vector perpendicular to the horizon. For low frequencies, the resulting mass term induces a total reflection. This reflection is accompanied by an extra mode mixing which occurs in the supersonic region, and which cancels out the infrared divergence of the near horizon spectrum. As a result, the amplitude of the undulation (0-frequency wave with macroscopic amplitude) emitted in white hole flows now saturates at the linear level, unlike what is found in the massless case. In addition, we point out that the mass introduces a new type of undulation which is produced in black hole flows, and which is well described in the hydrodynamical regime. |
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Address |
[Coutant, Antonin; Parentani, Renaud] Univ Paris 11, Phys Theor Lab, CNRS, UMR 8627, F-91405 Orsay, France, Email: antonin.coutant@th.u-psud.fr; |
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Publisher |
Amer Physical Soc |
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English |
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ISSN |
1550-7998 |
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Conference |
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Notes |
WOS:000308642300005 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
1174 |
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| Permanent link to this record |
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Author |
Balbinot, R.; Fabbri, A. |
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Title |
The Hawking Effect in the Particles-Partners Correlations |
Type |
Journal Article |
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Year |
2023 |
Publication |
Physics |
Abbreviated Journal |
Physics |
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Volume |
5 |
Issue |
4 |
Pages |
968-982 |
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Keywords |
quantum fields in curved space; black holes; Hawking radiation; correlations across the horizon |
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Abstract |
We analyze the correlations functions across the horizon in Hawking black hole radiation to reveal the correlations between Hawking particles and their partners. The effects of the underlying space-time on this are shown in various examples ranging from acoustic black holes to regular black holes. |
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Address |
[Balbinot, Roberto] Univ Bologna, Dipartimento Fis, Via Irnerio 46, I-40126 Bologna, Italy, Email: roberto.balbinot@unibo.it; |
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Publisher |
Mdpi |
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English |
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Notes |
WOS:001130983900001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5858 |
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| Permanent link to this record |
