922 research outputs found

    Referring to discourse participants in Ibero-Romance languages

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    Synopsis: This volume brings together contributions by researchers focusing on personal pronouns in Ibero-Romance languages, going beyond the well-established variable of expressed vs. non-expressed subjects. While factors such as agreement morphology, topic shift and contrast or emphasis have been argued to account for variable subject expression, several corpus studies on Ibero-Romance languages have shown that the expression of subject pronouns goes beyond these traditionally established factors and is also subject to considerable dialectal variation. One of the factors affecting choice and expression of personal pronouns or other referential devices is whether the construction is used personally or impersonally. The use and emergence of new impersonal constructions, eventually also new (im)personal pronouns, as well as the variation found in the expression of human impersonality in different Ibero-Romance language varieties is another interesting research area that has gained ground in the recent years. In addition to variable subject expression, similar methods and theoretical approaches have been applied to study the expression of objects. Finally, the reference to the addressee(s) using different address pronouns and other address forms is an important field of study that is closely connected to the variable expression of pronouns. The present book sheds light on all these aspects of reference to discourse participants. The volume contains contributions with a strong empirical background and various methods and both written and spoken corpus data from Ibero-Romance languages. The focus on discourse participants highlights the special properties of first and second person referents and the factors affecting them that are often different from the anaphoric third person. The chapters are organized into three thematic sections: (i) Variable expression of subjects and objects, (ii) Between personal and impersonal, and (iii) Reference to the addressee

    Integrated Geophysical Analysis of Passive Continental Margins: Insights into the Crustal Structure of the Namibian Margin from Magnetotelluric, Gravity, and Seismic Data

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    Passive continental margin research amalgamates the investigation of many broad topics, such as the emergence of oceanic crust, lithospheric stress patterns and plume-lithosphere interaction, reservoir potential, methane cycle, and general global geodynamics. Central tasks in this field of research are geophysical investigations of the structure, composition, and dynamic of the passive margin crust and upper mantle. A key practice to improve geophysical models and their interpretation, is the integrated analysis of multiple data, or the integration of complementary models and data. In this thesis, I compare four different inversion results based on data from the Namibian passive continental margin. These are a) a single method MT inversion; b) constrained inversion of MT data, cross-gradient coupled with a fixed structural density model; c) cross-gradient coupled joint inversion of MT and satellite gravity data; d) constrained inversion of MT data, cross-gradient coupled with a fixed gradient velocity model. To bridge the formal analysis of geophysical models with geological interpretations, I define a link between the physical parameter models and geological units. Therefore, the results from the joint MT and gravity inversion (c) are correlated through a user-unbiased clustering analysis. This clustering analysis results in a distinct difference in the signature of the transitional crust south of- and along the supposed hot-spot track Walvis Ridge. I ascribe this contrast to an increase in magmatic activity above the volcanic center along Walvis Ridge. Furthermore, the analysis helps to clearly identify areas of interlayered massive, and weathered volcanic flows, which are usually only identified in reflection seismic studies as seaward dipping reflectors. Lastly, the clustering helps to differentiate two types of sediment cover. Namely, one of near-shore, thick, clastic sediments, and one of further offshore located, more biogenic, marine sediments

    New Physics in the Age of Precision Cosmology

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    The Lambda-cold dark matter (LCDM) model has become the standard model of cosmology because of its ability to reproduce a vast array of cosmological observations, from the earliest moments of our Universe, to the current period of accelerated expansion, which it does with great accuracy. However, the success of this model only distracts from its inherent flaws and ambiguities. LCDM is purely phenomenological, providing no physical explanation for the nature of dark matter, responsible for the formation and evolution of large-scale structure, and giving an inconclusive explanation for dark energy, which drives the current period of accelerated expansion. Furthermore, cracks in its observational grounding have begun to form. When LCDM is used to interpret recent high precision measurements, tensions appear between individual experiments: the inferred values of the current cosmic expansion rate H0 and the amplitude of cosmic density fluctuations S8 based on early universe measurements of the cosmic microwave background (CMB), are in disagreement with the values measured in the local universe, probed by supernovae, weak lensing, and galaxy surveys. These tensions, if not caused by unaccounted for systematics, suggest that the model we use to interpret early universe data may be incomplete. This thesis collects works investigating alternative cosmologies and new analysis techniques which aim to explain these tensions and ambiguities in LCDM, and provide new probes of beyond the standard model physics. I present four main projects here: I developed an assisted quintessence model of early dark energy (EDE), linking the early and late epochs of cosmic acceleration, which provides a solution to the H0 tension and coincidence problem of dark energy; I investigated the role that microphysics plays on the EDE solution to the Hubble tension, and found that EDE with an anisotropic shear can solve both the Hubble and S8 tensions simultaneously; I developed a method of using line-intensity mapping to constrain beyond the standard model physics, which I used to forecast constraints on non-CDM models and non-Gaussianity; and I derived the cosmological perturbations and initial conditions for a dark energy model built from a three classical U(1) gauge fields coupled to a scalar field, which I will use to investigate the compatibility of a such a scenario with cosmological observations

    Vagueness Markers in Italian

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    Moving from a broad socio-pragmatic perspective, this study analyses how speakers of different ages use a class of items and constructions that codify intentional vagueness in Italian. Items as un po’ ‘a bit’, tipo ‘kind’, diciamo ‘let us say’, così ‘so’, e cose del genere ‘and things like that’, or cosa ‘thing’ constitute a class of linguistically heterogeneous means that often function in conversation as vagueness markers, i.e. elements by which speakers signal that their knowledge or communication are somehow only tentative, approximate and vague. Their use does not depend on language systemic factors, but is the result of a, more or less conscious, choice of speakers to enhance conversation for different reasons, which include facilitating the flow of conversation, signifying a vague categorization, and, eventually, being polite. Operating at the pragmatic level, vagueness markers represent elements that are readily available to speakers’ choices and contribute to characterize individual and generational discourse styles. Through a corpus-based analysis of listeners’ phone-ins to a Milan radio station, this study investigates how vagueness markers are used by speakers of different ages in 1976 and in 2010, and how Italian discourse styles have evolved in the last forty years

    Astrophysics with the Laser Interferometer Space Antenna

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    The Laser Interferometer Space Antenna (LISA) will be a transformative experiment for gravitational wave astronomy, and, as such, it will offer unique opportunities to address many key astrophysical questions in a completely novel way. The synergy with ground-based and space-born instruments in the electromagnetic domain, by enabling multi-messenger observations, will add further to the discovery potential of LISA. The next decade is crucial to prepare the astrophysical community for LISA's first observations. This review outlines the extensive landscape of astrophysical theory, numerical simulations, and astronomical observations that are instrumental for modeling and interpreting the upcoming LISA datastream. To this aim, the current knowledge in three main source classes for LISA is reviewed; ultra-compact stellar-mass binaries, massive black hole binaries, and extreme or interme-diate mass ratio inspirals. The relevant astrophysical processes and the established modeling techniques are summarized. Likewise, open issues and gaps in our understanding of these sources are highlighted, along with an indication of how LISA could help making progress in the different areas. New research avenues that LISA itself, or its joint exploitation with upcoming studies in the electromagnetic domain, will enable, are also illustrated. Improvements in modeling and analysis approaches, such as the combination of numerical simulations and modern data science techniques, are discussed. This review is intended to be a starting point for using LISA as a new discovery tool for understanding our Universe
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