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Your search keyword '"Caprini, Chiara"' showing total 4 results
Start Over Author "Caprini, Chiara" Topic inflationary universe
4 results on '"Caprini, Chiara"'

1. Detection of early-universe gravitational-wave signatures and fundamental physics.

Author

Caldwell, Robert, Cui, Yanou, Guo, Huai-Ke, Mandic, Vuk, Mariotti, Alberto, No, Jose Miguel, Ramsey-Musolf, Michael J., Sakellariadou, Mairi, Sinha, Kuver, Wang, Lian-Tao, White, Graham, Zhao, Yue, An, Haipeng, Bian, Ligong, Caprini, Chiara, Clesse, Sebastien, Cline, James M., Cusin, Giulia, Fornal, Bartosz, and Jinno, Ryusuke

Subjects
LARGE scale structure (Astronomy), INFLATIONARY universe, PHYSICS, GRAVITATIONAL waves, BLACK holes, SIGNAL detection, PHASE transitions
Abstract

Detection of a gravitational-wave signal of non-astrophysical origin would be a landmark discovery, potentially providing a significant clue to some of our most basic, big-picture scientific questions about the Universe. In this white paper, we survey the leading early-Universe mechanisms that may produce a detectable signal—including inflation, phase transitions, topological defects, as well as primordial black holes—and highlight the connections to fundamental physics. We review the complementarity with collider searches for new physics, and multimessenger probes of the large-scale structure of the Universe. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Magnetic fields from inflation: The transition to the radiation era.

Author

Bonvin, Camille, Caprini, Chiara, and Durrer, Ruth

Subjects
*MAGNETIC fields, *INFLATIONARY universe, *RADIATIVE transitions, *QUANTUM perturbations, *COSMOLOGICAL constant, *COSMIC background radiation
Abstract

We compute the contribution to the scalar metric perturbations from large-scale magnetic fields which are generated during inflation. We show that apart from the usual passive and compensated modes, the magnetic fields also contribute to the constant mode from inflation. This is different from the causal (postinflationary) generation of magnetic fields where such a mode is absent and it might lead to significant, non-Gaussian CMB anisotropics. [ABSTRACT FROM AUTHOR]

Published
2012
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3. Observational constraint on the fourth derivative of the inflaton potential.

Author

Caprini, Chiara, Hansen, Steen H., and Kunz, Martin

Subjects
*COSMIC background radiation, *INFLATIONARY universe
Abstract

ABSTRACT We consider the flow equations for the three slow-roll parameters n[sub S] (scalar spectral index), r (tensor-to-scalar ratio), and dn[sub S]/d ln k (running of the spectral index). We show that the combination of these flow equations with the observational bounds from cosmic microwave background and large-scale structure allows one to put a lower bound on the fourth derivative of the inflationary potential, M[sup 4][sub P](V″/V) > - 0.02 . [ABSTRACT FROM AUTHOR]

Published
2003
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4. Magnetic fields from inflation: The CMB temperature anisotropies.

Author

Bonvin, Camille, Caprini, Chiara, and Durrer, Ruth

Subjects
*ANISOTROPY, *MAGNETIC fields, *INFLATIONARY universe
Abstract

The cosmic microwave background (CMB) temperature anisotropies from primordial magnetic fields are studied. In addition to the known passive and compensated modes we discuss an inflationary magnetic mode in the curvature perturbation, present when magnetic fields are generated during inflation. This mode is absent if the generation mechanism is causal, e.g. a phase transition. We compute and discuss the effect of this mode on the observed CMB anisotropy spectrum, in comparison with the passive and compensated ones. We find that it dominates the CMB anisotropy, and consequently leads to stronger constraints on the amplitude B1 Mpc and spectral index nB of the magnetic field than what is usually found in CMB analyses from the compensated mode. This happens in particular for spectral indexes nB>-3: the inflationary magnetic mode is always scale invariant; therefore through this mode even a magnetic field with a spectrum which is not scale invariant can leave a detectable signal in the CMB at large scales. [ABSTRACT FROM AUTHOR]

Published
2013
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