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CERN Document Server 9 record trovati  La ricerca ha impiegato 0.56 secondi. 
1.
The one-loop power spectrum of curvature fluctuations in ultra slow-roll inflation / Ballesteros, Guillermo (speaker)
I will discuss the ratio of the one-loop to the tree-level power spectrum of curvature fluctuations in a toy model of USR inflation, with the aim of discerning if perturbation theory breaks in related scenarios of PBH dark matter..
2024 - 3030. TH institutes; Looping in the Primordial Universe External links: Talk details; Event details In : Looping in the Primordial Universe
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2.
Exceptional Composite Dark Matter / Ballesteros, Guillermo (IPhT, Saclay) ; Carmona, Adrian (CERN) ; Chala, Mikael (Valencia U. ; Valencia U., IFIC)
We study the dark matter phenomenology of non-minimal composite Higgs models with $SO(7)$ broken to the exceptional group $G_2$. In addition to the Higgs, three pseudo-Nambu-Goldstone bosons arise, one of which is electrically neutral. [...]
arXiv:1704.07388; CERN-TH-2017-083; FTUV-17-0417.9647.- 2017-07-14 - 32 p. - Published in : Eur. Phys. J. C 77 (2017) 468 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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3.
Standard Model—axion—seesaw—Higgs portal inflation. Five problems of particle physics and cosmology solved in one stroke / Ballesteros, Guillermo (IPhT, Saclay) ; Redondo, Javier (Zaragoza U. ; Munich, Max Planck Inst.) ; Ringwald, Andreas (DESY) ; Tamarit, Carlos (Durham U., IPPP)
We present a minimal extension of the Standard Model (SM) providing a consistent picture of particle physics from the electroweak scale to the Planck scale and of cosmology from inflation until today. Three right-handed neutrinos $N_i$, a new color triplet $Q$ and a complex SM-singlet scalar $\sigma$, whose vacuum expectation value $v_\sigma \sim 10^{11}$ GeV breaks lepton number and a Peccei-Quinn symmetry simultaneously, are added to the SM. [...]
arXiv:1610.01639; DESY-16-184; IPPP-16-79; CERN-TH-2016-055.- 2017-08-02 - 89 p. - Published in : JCAP 08 (2017) 001 Fulltext: PDF; External link: Preprint
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4.
Thermodynamics of perfect fluids from scalar field theory / Ballesteros, Guillermo (IPhT, Saclay ; CERN) ; Comelli, Denis (INFN, Ferrara) ; Pilo, Luigi (Gran Sasso ; L'Aquila U.)
The low-energy dynamics of relativistic continuous media is given by a shift-symmetric effective theory of four scalar fields. These scalars describe the embedding in spacetime of the medium and play the role of Stuckelberg fields for spontaneously broken spatial and time translations. [...]
arXiv:1605.05304; CERN-TH-2016-098; CERN-TH-2016-098.- 2016-07-27 - 15 p. - Published in : Phys. Rev. D 94 (2016) 025034 APS Open Access article: PDF; Fulltext: 10.1103_PhysRevD.94.025034 - PDF; arXiv:1605.05304 - PDF; External link: Preprint
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5.
Massive and modified gravity as self-gravitating media / Ballesteros, Guillermo (IPhT, Saclay ; CERN) ; Comelli, Denis (INFN, Ferrara) ; Pilo, Luigi (Gran Sasso ; L'Aquila U.)
We study the effective field theory that describes the low-energy physics of self-gravitating media. The field content consists of four derivatively coupled scalar fields that can be identified with the internal comoving coordinates of the medium. [...]
arXiv:1603.02956; CERN-TH-2016-043; CERN-TH-2016-043.- Geneva : CERN, 2016-12-19 - 25 p. - Published in : Phys. Rev. D 94 (2016) 124023 Fulltext: arXiv:1603.02956 - PDF; 10.1103_PhysRevD.94.124023 - PDF; External link: Preprint
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6.
Radiative plateau inflation / Ballesteros, Guillermo (Saclay, SPhT ; CERN ; Madrid, IFT) ; Tamarit, Carlos (Durham U., IPPP)
We describe how monomial chaotic inflation becomes compatible with the latest CMB data thanks to radiative corrections producing a plateau. The interactions of the inflation with other fields, required for reheating, can flatten the potential and moderate the production of primordial gravitational waves, keeping these below the current upper bound. [...]
arXiv:1510.05669; SACLAY-T15-176; CERN-PH-TH-2015-247; IFT-UAM-CSIC-15-11; DCPT-15-116; IPPP-15-58; CERN-PH-TH-2015-247.- Geneva : CERN, 2016-02-23 - 29 p. - Published in : JHEP 02 (2016) 153 Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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7.
Higgs portal valleys, stability and inflation / Ballesteros, Guillermo (Madrid, IFT ; CERN) ; Tamarit, Carlos (Durham U., IPPP)
The measured values of the Higgs and top quark masses imply that the Standard Model potential is very likely to be unstable at large Higgs values. This is particularly problematic during inflation, which sources large perturbations of the Higgs. [...]
arXiv:1505.07476; IFT-UAM-CSIC-15-045; CERN-PH-TH-2015-126; IPPP-15-27; DCPT-15-54; IFT-UAM-CSIC-15-045; CERN-PH-TH-2015-126; IPPP-15-27; DCPT-15-54.- Geneva : CERN, 2015-09-30 - 67 p. - Published in : JHEP 09 (2015) 210 Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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8.
Dark energy with non-adiabatic sound speed: initial conditions and detectability / Ballesteros, Guillermo (Enrico Fermi Ctr., Rome ; Padua U. ; INFN, Padua) ; Lesgourgues, Julien (CERN ; IPT, Lausanne ; Annecy, LAPTH)
Assuming that the universe contains a dark energy fluid with a constant linear equation of state and a constant sound speed, we study the prospects of detecting dark energy perturbations using CMB data from Planck, cross-correlated with galaxy distribution maps from a survey like LSST. We update previous analytical estimates by carrying a full Bayesian analysis of mock data. [...]
arXiv:1004.5509; CERN-PH-TH-2010-092; LAPTH-017-10.- 2010 - Published in : JCAP 10 (2010) 014 External link: Preprint
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9.
Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures / Ballesteros, Guillermo (Madrid, IFT ; CERN) ; Riotto, Antonio (CERN ; INFN, Padua)
We present an analytical fit to the growth function of the dark matter perturbations when dark energy perturbations are present. The growth index depends upon the dark energy equation of state w, the speed of sound of the dark energy fluctuations, the dark matter abundance and the observed comoving scale. [...]
arXiv:0807.3343; CERN-PH-TH-2008-160; IFT-UAM-CSIC-08-46; CERN-PH-TH-2008-160; IFT-UAM-CSIC-08-46.- Geneva : CERN, 2008 - 6 p. - Published in : Phys. Lett. B 668 (2008) 171-176 Fulltext: PDF; External link: Preprint
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Vedi anche: autori con nomi simili
3 Ballesteros, G
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