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CERN Document Server	24 のレコードが見つかりました。 1 - 10 レコードへジャンプ：	検索にかかった時間： 1.87 秒

Hubble trouble or Hubble bubble? / Romano, Antonio Enea (CERN ; Antioquia U.)
The recent analysis of low-redshift supernovae (SN) has increased the apparent tension between the value of H0estimated from low and high redshift observations such as the cosmic microwave background (CMB) radiation. At the same time other observations have provided evidence of the existence of local radial inhomogeneities extending indifferent directions up to a redshift of about 0.07. About 40% of the Cepheids used for SN calibration are directly affected because are located along the directions of these in homogeneities [...]
2022 - 6 p. - Published in : 10.1142/9789811258251_0177 Fulltext: PDF;
In : 15th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories, Rome, Italy, 1 - 7 Jul 2018, pp.1251-1256

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Constraining the time evolution of the propagation speed of gravitational waves with multimessenger astronomy / Romano, Antonio Enea (ICRA, Pescara ; CERN) ; Sakellariadou, Mairi (King's Coll. London)
Several modified gravity theories predict a possible time variation of the propagation speed of gravitational waves (GW) which could be tested with multimessenger astronomy. [...]
arXiv:2309.10903. - 7 p.
Fulltext

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Mirage of Luminal Modified Gravitational-Wave Propagation / Romano, Antonio Enea (CERN ; ICRA, Pescara ; Antioquia U.) ; Sakellariadou, Mairi (King's Coll. London)
Using conformal invariance of gravitational waves, we show that for a luminal modified gravity theory, the gravitational-wave propagation and luminosity distance are the same as in general relativity. The relation between the gravitational-wave and electromagnetic-wave luminosity distance gets however modified for electromagnetism minimally coupled to the Jordan frame metric. [...]
arXiv:2302.05413; CERN-TH-2023-017; KCL-PH-TH-2023-08.- 2023-06-08 - 5 p. - Published in : Phys. Rev. Lett. 130 (2023) 231401 Fulltext: 2302.05413 - PDF; Publication - PDF;

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Gravitoelectromagnetic quadrirefringence / Romano, Antonio Enea (ICRA, Pescara ; Antioquia U.) ; Vallejo-Peña, Sergio A. (ICRA, Pescara ; Antioquia U.)
We develop an effective approach for the study of the interaction of gravitational waves (GWs) and electromagnetic waves (EMWs), showing that quadrirefringence can be produced, a phenomenon consisting in a frequency and polarization dependency of the speed of the different polarizations of GWs and EMWs, which is also inducing a frequency and polarization dependent modification of the GW-EMW luminosity distance ratio. Quadrirefringence can be due to the GW-EMW interaction in the source or during the propagation from the source to the observer. [...]
arXiv:2301.11304; CERN-TH-2023-013.- 2024-04-04 - 4 p. - Published in : Phys. Dark Univ. 44 (2024) 101492 Fulltext: PDF;

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Effective speed of cosmological perturbations / Romano, Antonio Enea (ICRA, Pescara)
We derive an effective equation and action for comoving curvature perturbations and gravitational waves (GWs) in terms of a time, momentum and polarization dependent effective speed, encoding the effects of the interaction among metric perturbations or with other fields, such as dark energy and dark matter. The structure of the effective actions and equations is the same for scalar and tensor perturbations, and the effective actions can be written as the Klein-Gordon action in terms of an appropriately defined effective metric, dependent on the effective speed. [...]
arXiv:2301.05679; CERN-TH-2023-006.- 2024-06-04 - 24 p. - Published in : Phys. Dark Univ. 45 (2024) 101549 Fulltext: PDF;

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$H_0$ tension or $M$ overestimation? / Mazo, Brayan Yamid Del Valle (ICRA, Pescara ; Unlisted, CO) ; Romano, Antonio Enea (CERN ; ICRA, Pescara ; Unlisted, CO) ; Quintero, Maryi Alejandra Carvajal (ICRA, Pescara ; Unlisted, CO)
There is a strong discrepancy between the value of the Hubble parameter $H_0^P$ obtained from large scale observations such as the Planck mission, and the small scale value $H_0^R$, obtained from low redshift supernovae (SNe). The value of the absolute magnitude $M^{Hom}$ used as prior in analyzing observational data is obtained from low-redshift SNe, assuming a homogeneous Universe, but the distance of the anchors used to calibrate the SNe to obtain $M$ would be affected by a local inhomogeneity, making it inconsistent to test the Copernican principle using $M^{Hom}$, since $M$ estimation itself is affected by local inhomogeneities. [...]
arXiv:2202.11852.- 2022-07-12 - 7 p. - Published in : Eur. Phys. J. C 82 (2022) 610 Fulltext: 2202.11852 - PDF; document - PDF;

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Reconstructing homospectral inflationary potentials / Gallego Cadavid, Alexander (Chile U., Santiago ; Antioquia U.) ; Romano, Antonio Enea (Antioquia U. ; ICRA, Pescara) ; Liddle, Andrew R. (Lisbon U.)
Purely geometrical arguments show that there exist classes of homospectral inflationary cosmologies, i.e. different expansion histories producing the same spectrum of comoving curvature perturbations. [...]
2022-10-13 - 7 p. - Published in : Phys. Rev. D Fulltext: PDF;

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Effects of the shape of curvature peaks on the size of primordial black holes / Escrivà, Albert (ICC, Barcelona U. ; Barcelona U.) ; Romano, Antonio Enea (CERN ; ICRA, Pescara)
We simulate numerically the formation of spherically symmetric primordial black holes (PBHs) seeded by different families of primordial curvature perturbations profiles on a Friedman-Robertson-Walker (FRW) Universe filled by radiation fluid. We have studied the dependency on the curvature profile of the initial mass $M_{\rm BH,i}$ of the PBHs at the time of apparent horizon formation $t_{AH}$, and the final mass $M_{\rm BH,f}$ after the accretion process, using an excision technique, comparing $M_{\rm BH,i}$ to previous analytical estimations obtained using compensated PBHs model approach. [...]
arXiv:2103.03867; ICCUB-21-003.- 2021-05-24 - 17 p. - Published in : JCAP 2105 (2021) 066 Fulltext: PDF;

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The MESS of the CMB / Rodrguez, Manuel Alejandro Jaramillo (ICRA, Pescara ; Antioquia U.) ; Romano, Antonio Enea (ICRA, Pescara ; Antioquia U. ; CERN) ; Vallejo-Peña, Sergio Andrés (ICRA, Pescara ; Antioquia U.)
We analyze cosmic microwave background (CMB) data taking into account the effects of a momentum dependent effective sound speed (MESS). This approach allows to study the effects of primordial entropy in a model independent way, and its implementation requires a minimal modification of existing CMB fitting numerical codes developed for single scalar field models. [...]
arXiv:2006.03395.- 2021-02-17 - 14 p. - Published in : JCAP 2102 (2021) 033 Fulltext: PDF;

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10.

Sound speed induced production of primordial black holes / Romano, Antonio Enea (CERN ; ICRA, Pescara)
We study different mechanisms by which the speed of primordial curvature perturbations can produce an enhancement of the curvature spectrum, which could lead to the production of primordial black holes (PBH). [...]
arXiv:2006.07321. - 5 p.
Fulltext

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似た著者名：
87	Romano, A
4	Romano, A E
15	Romano, A.
2	Romano, Aldo
1	Romano, Alfonso
37	Romano, Angela
2	Romano, Anna
2	Romano, Anna Lisa
19	Romano, Annalisa
1	Romano, Anthony
12	Romano, Antonio
2	Romano, Antonio E
60	Romano, Antonio Enea
1	Romano, Antony
87	romano, A

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