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CERN Document Server Pronađeno je 9 zapisa  Pretraživanje je potrajalo 0.63 sekundi 
1.
Collapsing Domain Wall Networks: Impact on Pulsar Timing Arrays and Primordial Black Holes / Ferreira, Ricardo Z. (Coimbra U.) ; Notari, Alessio (Barcelona U. ; INFN, Florence) ; Pujolàs, Oriol (BIST, Barcelona) ; Rompineve, Fabrizio (ICC, Barcelona U. ; BIST, Barcelona ; CERN)
Unstable domain wall (DW) networks in the early universe are cosmologically viable and can emit a large amount of gravitational waves (GW) before annihilating. As such, they provide an interpretation for the recent signal reported by Pulsar Timing Array (PTA) collaborations. [...]
arXiv:2401.14331; CERN-TH-2024-020.- 2024-06-11 - 16 p. - Published in : JCAP 2406 (2024) 020 Fulltext: document - PDF; 2401.14331 - PDF;
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2.
Improved hot dark matter bound on the QCD axion / Notari, Alessio (Barcelona U. ; INFN, Florence) ; Rompineve, Fabrizio (CERN) ; Villadoro, Giovanni (ICTP, Trieste)
We strengthen the cosmological bound on the axion mass, by solving the momentum-dependent Boltzmann equations for axion-pion scatterings and by using a phenomenological production rate derived from pion-pion scattering data, overcoming the breakdown of chiral perturbation theory. Using present cosmological datasets we obtain $m_a\leq 0.24~\text{eV}$. [...]
arXiv:2211.03799; CERN-TH-2022-165.- 2023-07-07 - 8 p. - Published in : Phys. Rev. Lett. 131 (2023) 011004 Fulltext: Publication - PDF; 2211.03799 - PDF;
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3.
Gravitational Waves from Domain Walls in Pulsar Timing Array Datasets / Ferreira, Ricardo Z. (Barcelona, IFAE) ; Notari, Alessio (Barcelona U., ECM ; ICC, Barcelona U.) ; Pujolas, Oriol (Barcelona, IFAE) ; Rompineve, Fabrizio (CERN)
We present a model-independent search for the gravitational wave background from cosmic domain walls (DWs) in the NANOGrav 12.5 years dataset and International PTA Data Release 2. DWs that annihilate at temperatures $\sim 20-50~\text{MeV}$ with tensions $\sim (40-100~\text{TeV})^3$ provide as good a fit to both datasets as the astrophysical background from supermassive black hole mergers. [...]
arXiv:2204.04228; CERN-TH-2022-214.- 2023-02-01 - 12 p. - Published in : JCAP 02 (2023) 001 Fulltext: 2204.04228 - PDF; document - PDF;
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4.
Exploring Cosmic Origins with CORE: Inflation / Finelli, Fabio (Bologna Observ. ; INFN, Bologna) ; Bucher, Martin (APC, Paris) ; Achúcarro, Ana (Leiden U. ; Basque U., Bilbao) ; Ballardini, Mario (Bologna U. ; Bologna Observ. ; INFN, Bologna) ; Bartolo, Nicola (Padua U. ; INFN, Padua ; Padua Observ.) ; Baumann, Daniel (Cambridge U., DAMTP ; Amsterdam U.) ; Clesse, Sébastien (Aachen, Tech. Hochsch.) ; Errard, Josquin (ILP, Paris ; Paris U., VI-VII) ; Handley, Will (Cambridge U. ; Cambridge U., KICC) ; Hindmarsh, Mark (Sussex U. ; Helsinki Inst. of Phys. ; Helsinki U.) et al. /CORE
We forecast the scientific capabilities to improve our understanding of cosmic inflation of CORE, a proposed CMB space satellite submitted in response to the ESA fifth call for a medium-size mission opportunity. The CORE satellite will map the CMB anisotropies in temperature and polarization in 19 frequency channels spanning the range 60-600 GHz. [...]
arXiv:1612.08270.- 2018-04-05 - 100 p. - Published in : JCAP 04 (2018) 016 Fulltext: PDF;
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5.
Dissipative Axial Inflation / Notari, Alessio (Barcelona U., Dept. Fund. Phys. ; ICC, Barcelona U.) ; Tywoniuk, Konrad (CERN)
We analyze in detail the background cosmological evolution of a scalar field coupled to a massless abelian gauge field through an axial term $\frac{\phi}{f_\gamma} F \tilde{F}$, such as in the case of an axion. Gauge fields in this case are known to experience tachyonic growth and therefore can backreact on the background as an effective dissipation into radiation energy density $\rho_R$, which which can lead to inflation without the need of a flat potential. [...]
arXiv:1608.06223; CERN-TH-2016-189.- 2016-12-22 - 23 p. - Published in : JCAP Article from SCOAP3: PDF; Fulltext: 10.1088_1475-7516_2016_12_038 - PDF; arXiv:1608.06223 - PDF; External link: Preprint
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6.
The Cold Spot as a Large Void: Lensing Effect on CMB Two and Three Point Correlation Functions / Masina, Isabella (INFN, Ferrara) ; Notari, Alessio (CERN)
The "Cold Spot" in the CMB sky could be due to the presence of an anomalous huge spherical underdense region - a "Void" - of a few hundreds Mpc/h radius. Such a structure would have an impact on the CMB two-point (power spectrum) and three-point (bispectrum) correlation functions not only at low-l, but also at high-l through Lensing, which is a unique signature of a Void. [...]
arXiv:0905.1073; CERN-PH-TH-2009-079.- 2009 - Published in : JCAP 07 (2009) 035 External link: Preprint
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7.
The Cold Spot as a Large Void : Rees-Sciama effect on CMB Power Spectrum and Bispectrum / Masina, Isabella (CERN) ; Notari, Alessio (CERN)
The detection of a "Cold Spot" in the CMB sky could be explained by the presence of an anomalously large spherical underdense region (with radius of a few hundreds Mpc/h) located between us and the Last Scattering Surface. Modeling such an underdensity with an LTB metric, we investigate whether it could produce significant signals on the CMB power spectrum and bispectrum, via the Rees-Sciama effect. [...]
arXiv:0808.1811.- 2009 - 17 p. - Published in : JCAP 02 (2009) 019 IOP Open Access article: PDF; External link: Preprint
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8.
Local Void vs Dark Energy: Confrontation with WMAP and Type Ia Supernovae / Alexander, Stephon (Penn State U.) ; Biswas, Tirthabir (Penn State U.) ; Notari, Alessio (McGill U. ; CERN) ; Vaid, Deepak (Penn State U.)
It is now a known fact that if we happen to be living in the middle of a large underdense region, then we will observe an ``apparent acceleration'', even when any form of dark energy is absent. In this paper, we present a ``Minimal Void'' scenario, i.e. [...]
arXiv:0712.0370; IGPG-07-2-1.- 2009 - 26 p. - Published in : JCAP 09 (2009) 025 Fulltext: PDF; External link: Fulltext
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9.
Minimal Theoretical Uncertainties in Inflationary Predictions / Chung, Daniel J.H. (CERN ; Wisconsin U., Madison) ; Notari, Alessio (Pisa, Scuola Normale Superiore) ; Riotto, Antonio (INFN, Padua)
During inflation, primordial energy density fluctuations are created from approximate de Sitter vacuum quantum fluctuations redshifted out of the horizon after which they are frozen as perturbations in the background curvature. In this paper we demonstrate that there exists an intrinsic theoretical uncertainty in the inflationary predictions for the curvature perturbations due to the failure of the well known prescriptions to specify the vacuum uniquely. [...]
hep-ph/0305074; CERN-TH-2003-105; CERN-TH-2003-105.- Geneva : CERN, 2003 - 35 p. - Published in : JCAP 10 (2003) 012 Access to fulltext document: PDF; Fulltext: PDF; External links: Fulltext; JCAP Electronic Journal Server - Please contact the library if you need to access this document.
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