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1.
Snowmass Theory Frontier: Astrophysics and Cosmology / Green, Daniel (UC, San Diego) ; Ruderman, Joshua T. (New York U., CCPP) ; Safdi, Benjamin R. (UC, Berkeley) ; Shelton, Jessie (Illinois U., Urbana) ; Achucarro, Ana (Leiden U.) ; Adshead, Peter (Illinois U., Urbana) ; Akrami, Yashar (Case Western Reserve U. ; Imperial Coll., London) ; Baryakhtar, Masha (Washington U., Seattle) ; Baumann, Daniel (Taiwan, Natl. Taiwan U. ; U. Amsterdam, GRAPPA) ; Berlin, Asher (Fermilab) et al.
We summarize progress made in theoretical astrophysics and cosmology over the past decade and areas of interest for the coming decade. [...]
arXiv:2209.06854 ; FERMILAB-PUB-22-721-T.
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Fermilab Library Server - Fulltext - Fulltext
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Inflation: Theory and Observations / Achúcarro, Ana (Leiden U. ; Basque U., Bilbao) ; Biagetti, Matteo (SISSA, Trieste ; INFN, Trieste ; Trieste Observ.) ; Braglia, Matteo (Madrid, IFT ; Bologna Observ.) ; Cabass, Giovanni (Princeton, Inst. Advanced Study) ; Caldwell, Robert (Dartmouth Coll.) ; Castorina, Emanuele (Milan U.) ; Chen, Xingang (Harvard U.) ; Coulton, William (CCA, New York) ; Flauger, Raphael (UC, San Diego) ; Fumagalli, Jacopo (Madrid, IFT) et al.
Cosmic inflation provides a window to the highest energy densities accessible in nature, far beyond those achievable in any realistic terrestrial experiment. [...]
arXiv:2203.08128.
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eConf - Fulltext
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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;
4.
Correlating features in the primordial spectra / Achúcarro, Ana (Leiden U. ; Basque U., Bilbao) ; Gong, Jinn-Ouk (CERN ; APCTP, Pohang ; POSTECH) ; Palma, Gonzalo A. (Chile U., Beauchef) ; Patil, Subodh P. (CERN)
Heavy fields coupled to the inflaton reduce the speed of sound in the effective theory of the adiabatic mode each time the background inflationary trajectory deviates from a geodesic. This can result in features in the primordial spectra. [...]
arXiv:1211.5619; CERN-PH-TH-2012-315; APCTP-PRE2012-016; CERN-PH-TH-2012-315; APCTP-PRE2012-016.- 2013-06-03 - 5 p. - Published in : Phys. Rev. D 87 (2013) 121301(R) APS Published version, local copy: PDF; Fulltext: PDF; External link: Preprint
5.
Heavy fields, reduced speeds of sound and decoupling during inflation / Achucarro, Ana (Basque U., Bilbao ; Leiden U.) ; Atal, Vicente (Leiden U.) ; Cespedes, Sebastian (Chile U., Santiago) ; Gong, Jinn-Ouk (CERN) ; Palma, Gonzalo A (Chile U., Santiago) ; Patil, Subodh P (Ecole Polytechnique, CPHT)
We discuss and clarify the validity of effective single field theories of inflation obtained by integrating out heavy degrees of freedom in the regime where adiabatic perturbations propagate with a suppressed speed of sound. We show by construction that it is indeed possible to have inflationary backgrounds where the speed of sound remains suppressed and slow-roll persists for long enough. [...]
arXiv:1205.0710; CERN-PH-TH-2012-097.- 2012 - Published in : Phys. Rev. D 86 (2012) 121301 APS Published version, local copy: PDF; External link: Preprint
6.
Effective theories of single field inflation when heavy fields matter / Achucarro, Ana (Leiden U. ; Basque U., Bilbao) ; Gong, Jinn-Ouk (CERN) ; Hardeman, Sjoerd (Leiden U.) ; Palma, Gonzalo A (Chile U., Beaucheff) ; Patil, Subodh P (Ec. Polytech., Palaiseau (main) ; Ecole Normale Superieure)
We compute the low energy effective field theory (EFT) expansion for single-field inflationary models that descend from a parent theory containing multiple other scalar fields. By assuming that all other degrees of freedom in the parent theory are sufficiently massive relative to the inflaton, it is possible to derive an EFT valid to arbitrary order in perturbations, provided certain generalized adiabaticity conditions are respected. [...]
arXiv:1201.6342; CERN-PH-TH-2011-222; CPHT-RR 055.0711; LPTENS-11-27.- 2012 - Published in : JHEP 05 (2012) 066 Springer Open Access article: PDF; External link: Preprint
7.
Mass hierarchies and non-decoupling in multi-scalar field dynamics / Achúcarro, Ana ; Gong, Jinn-Ouk ; Hardeman, Sjoerd ; Palma, Gonzalo A ; Patil, Subodh P
In this work we study the effects of field space curvature on scalar field perturbations around an arbitrary background field trajectory evolving in time. Non-trivial imprints of the `heavy' directions arise when the vacuum manifold of the potential does not coincide with the span of geodesics defined by the sigma model metric of the low energy effective theory. [...]
arXiv:1005.3848; CPHT-RR 039.0510; LPTENS-10-20.- 2010 External link: Preprint

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