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Author |
Forconi, M.; Ruchika; Melchiorri, A.; Mena, O.; Menci, N. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Do the early galaxies observed by JWST disagree with Planck's CMB polarization measurements? |
Type |
Journal Article |
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Year |
2023 |
Publication |
Journal of Cosmology and Astroparticle Physics |
Abbreviated Journal |
J. Cosmol. Astropart. Phys. |
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Volume |
10 |
Issue |
10 |
Pages |
012 - 16pp |
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Keywords |
cosmological parameters from CMBR; high redshift galaxies; CMBR polarisation; reionization |
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Abstract |
The recent observations from the James Webb Space Telescope have led to a surprising discovery of a significant density of massive galaxies with masses of M >= 10(10.5)M(circle dot) at redshifts of approximately z similar to 10. This corresponds to a stellar mass density of roughly rho* similar to 10(6)M(circle dot) Mpc(-3). Despite making conservative assumptions regarding galaxy formation, this finding may not be compatible with the standard.CDM cosmology that is favored by observations of CMB Anisotropies from the Planck satellite. In this paper, we confirm the substantial discrepancy with Planck's results within the.CDM framework. Assuming a value of is an element of = 0.2 for the efficiency of converting baryons into stars, we indeed find that the.CDM model is excluded at more than 99.7% confidence level (C.L.). An even more significant exclusion is found for is an element of similar to 0.1, while a better agreement, but still in tension at more than 95%, is obtained for is an element of = 0.32. This tension, as already discussed in the literature, could arise either from systematics in the JWST measurements or from new physics. Here, as a last-ditch effort, we point out that disregarding the large angular scale polarization obtained by Planck, which allows for significantly larger values of the matter clustering parameter sigma(8), could lead to better agreement between Planck and JWST within the.CDM framework. Assuming.CDM and no systematics in the current JWST results, this implies either an unknown systematic error in current large angular scale CMB polarization measurements or an unidentified physical mechanism that could lower the expected amount of CMB polarization produced during the epoch of reionization. Interestingly, the model compatible with Planck temperature-only data and JWST observation also favors a higher Hubble constant H-0 = 69.0 +/- 1.1 km/s/Mpc at 68% C.L., in better agreement with observations based on SN-Ia luminosity distances. |
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Address |
[Forconi, Matteo; Ruchika; Melchiorri, Alessandro] Univ Roma La Sapienza, Phys Dept, Ple Aldo Moro 2, I-00185 Rome, Italy, Email: matteo.forconi@roma1.infn.it; |
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Publisher |
IOP Publishing Ltd |
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English |
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ISSN |
1475-7516 |
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Notes ![sorted by Notes field, descending order (down)](img/sort_desc.gif) |
WOS:001142721200001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5903 |
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Permanent link to this record |
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Author |
Gessner, M.; Smerzi, A. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Hierarchies of Frequentist Bounds for Quantum Metrology: From Cramer-Rao to Barankin |
Type |
Journal Article |
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Year |
2023 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
130 |
Issue |
26 |
Pages |
260801 - 6pp |
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Keywords |
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Abstract |
We derive lower bounds on the variance of estimators in quantum metrology by choosing test observables that define constraints on the unbiasedness of the estimator. The quantum bounds are obtained by analytical optimization over all possible quantum measurements and estimators that satisfy the given constraints. We obtain hierarchies of increasingly tight bounds that include the quantum Cramer-Rao bound at the lowest order. In the opposite limit, the quantum Barankin bound is the variance of the locally best unbiased estimator in quantum metrology. Our results reveal generalizations of the quantum Fisher information that are able to avoid regularity conditions and identify threshold behavior in quantum measurements with mixed states, caused by finite data. |
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Address |
[Gessner, Manuel] Univ Valencia, Dept Fis Teor, IFIC, CSIC, Carrer Dr Moliner 50, Valencia 46100, Spain, Email: manuel.gessner@uv.es; |
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Amer Physical Soc |
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English |
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ISSN |
0031-9007 |
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Notes ![sorted by Notes field, descending order (down)](img/sort_desc.gif) |
WOS:001140164100003 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5902 |
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Permanent link to this record |
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Author |
Illana, A. et al; Perez-Vidal, R.M. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Octupole correlations in the N = Z+2=56 110Xe nucleus |
Type |
Journal Article |
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Year |
2024 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
848 |
Issue |
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Pages |
138371 - 7pp |
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Keywords |
Octupole deformations; Xe-110; N = Z=56 region; Fusion evaporation reactions |
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Abstract |
This letter reports on the first observation of an octupole band in the neutron-deficient (N = Z + 2) nucleus Xe-110. The Xe-110 nuclei were produced via the Fe-54(Ni-58,2n) fusion-evaporation reaction. The emitted gamma rays were detected using the jurogam 3 gamma-ray spectrometer, while the fusion-evaporation residues were separated with the MARA separator at the Accelerator Laboratory of the University of Jyv & auml;skyl & auml;, Finland. The experimental observation of the low-lying 3(-) and 5(-) states and inter-band E1 transitions between the ground-state band and the octupole band proves the importance of octupole correlations in this region. These new experimental data combined with theoretical calculations using the symmetry-conserving configuration-mixing method, based on a Gogny energy density functional, have been interpreted as an evidence of enhanced octupole correlations in neutron-deficient xenon isotopes. |
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Address |
[Illana, A.; Auranen, K.; Beliuskina, O.; Delafosse, C.; Eronen, T.; Ge, Z.; Geldhof, S.; Gins, W.; Grahn, T.; Greenlees, P. T.; Joukainen, H.; Julin, R.; Jutila, H.; Kankainen, A.; Leino, M.; Louko, J.; Luoma, M.; Nesterenko, D.; Ojala, J.; Pakarinen, J.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Saren, J.; Uusitalo, J.; Zimba, G. L.] Univ Jyvaskyla, Dept Phys, Accelerator Lab, POB 35, Jyvaskyla FI-40014, Finland, Email: andres.illana@ucm.es; |
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Publisher |
Elsevier |
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English |
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ISSN |
0370-2693 |
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Notes ![sorted by Notes field, descending order (down)](img/sort_desc.gif) |
WOS:001139401700001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5880 |
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Permanent link to this record |
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Author |
LHCb Collaboration (Aaij, R. et al); Jaimes Elles, S.J.; Jashal, B.K.; Martinez-Vidal, F.; Oyanguren, A.; Rebollo De Miguel, M.; Remon Alepuz, C.; Ruiz Vidal, J.; Sanderswood, I. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Observation of a J/ψΛ Resonance Consistent with a Strange Pentaquark Candidate in B- → J/ψΛ(p)over-bar Decays |
Type |
Journal Article |
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Year |
2023 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
131 |
Issue |
3 |
Pages |
031901 - 11pp |
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Keywords |
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Abstract |
An amplitude analysis of B- -> J/psi Lambda(p) over bar decays is performed using 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb(-1). A narrow resonance in the J/psi Lambda system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2 +/- 0.7 +/- 0.4 MeV and 7.0 +/- 1.2 +/- 1.3 MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small Q-value of the reaction, the most precise single measurement of the B- mass to date, 5279.44 +/- 0.05 +/- 0.07 MeV, is obtained. |
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Address |
[de Souza Leite, J. Baptista; Bediaga, I. B.; Cruz Torres, M.; Da Graca, U. De Freitas Carneiro; De Miranda, J. M.; dos Reis, A. C.; Falcao, L. N.; Gomes, A.; Massafferri, A.; Torres Machado, D.] Ctr Brasileiro Pesquisas Fis CBPF, Rio De Janeiro, Brazil |
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Publisher |
Amer Physical Soc |
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English |
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ISSN |
0031-9007 |
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Notes ![sorted by Notes field, descending order (down)](img/sort_desc.gif) |
WOS:001138758100002 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5941 |
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Permanent link to this record |
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Author |
Alvarado, F.; An, D.; Alvarez-Ruso, L.; Leupold, S. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Light quark mass dependence of nucleon electromagnetic form factors in dispersively modified chiral perturbation theory |
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 |
11 |
Pages |
114021 - 23pp |
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Keywords |
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Abstract |
The nucleon isovector electromagnetic form factors are calculated up to next-to-next-to-leading order by combining relativistic chiral perturbation theory (ChPT) of pion, nucleon, and Delta o1232 thorn with dispersion theory. We specifically address the light-quark mass dependence of the form factors, achieving a good description of recent lattice QCD results over a range of Q2 less than or similar to 0.6 GeV2 and M pi less than or similar to 350 MeV. For the Dirac form factor, the combination of ChPT and dispersion theory outperforms the pure dispersive and pure ChPT descriptions. For the Pauli form factor, the combined calculation leads to results comparable to the purely dispersive ones. The anomalous magnetic moment and the Dirac and Pauli radii are extracted. |
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Address |
[Alvarado, Fernando; Alvarez-Ruso, Luis] CSIC, Inst Fis Corpuscular IF, E-46980 Paterna, Valencia, Spain, Email: Fernando.Alvarado@ific.uv.es; |
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Corporate Author |
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Thesis |
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Publisher |
Amer Physical Soc |
Place of Publication |
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Language |
English |
Summary Language |
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Edition |
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ISSN |
2470-0010 |
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Notes ![sorted by Notes field, descending order (down)](img/sort_desc.gif) |
WOS:001138524400003 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5906 |
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Permanent link to this record |