scholarly journals Inflationary gravitational waves in the effective field theory of modified gravity

2015 ◽  
Vol 91 (10) ◽  
Author(s):  
Antonio De Felice ◽  
Shinji Tsujikawa
Keyword(s):  
Field Theory ◽  
Gravitational Waves ◽  
Effective Field Theory ◽  
Modified Gravity ◽  
Effective Field

scholarly journals The Effective Field Theory of Dark Energy Diagnostic of Linear Horndeski Theories After GW170817 and GRB170817A

Universe ◽  
2019 ◽  
Vol 5 (6) ◽  
pp. 138 ◽  
Author(s):  
Louis Perenon ◽  
Hermano Velten
Keyword(s):  
Field Theory ◽  
Dark Energy ◽  
Gravitational Waves ◽  
Effective Field Theory ◽  
Large Scale ◽  
Propagation Speed ◽  
Growth Function ◽  
Large Scale Structure ◽  
Effective Field ◽  
Light Deflection

We summarize the effective field theory of dark energy construction to explore observable predictions of linear Horndeski theories. We review the diagnostic of these theories on the correlation of the large-scale structure phenomenological functions: the effective Newton constant, the light deflection parameter, and the growth function of matter perturbations. We take this opportunity to discuss the evolution of the bounds the propagation speed of gravitational waves has undergone and use the most restrictive one to update the diagnostic.

scholarly journals Effective field theory from modified gravity with massive modes

2014 ◽  
Vol 12 (01) ◽  
pp. 1550004 ◽  
Author(s):  
Salvatore Capozziello ◽  
Mariafelicia De Laurentis ◽  
Mariacristina Paolella ◽  
Giulia Ricciardi
Keyword(s):  
Field Theory ◽  
General Relativity ◽  
Effective Field Theories ◽  
Effective Field Theory ◽  
Modified Gravity ◽  
Effective Field ◽  
Field Theories ◽  
Suitable Choice ◽  
Minimal Extension ◽  
Curvature Invariants

Massive gravitational modes in effective field theories can be recovered by extending General Relativity and taking into account generic functions of the curvature invariants, not necessarily linear in the Ricci scalar R. In particular, adopting the minimal extension of f(R) gravity, an effective field theory with massive modes is straightforwardly recovered. This approach allows to evade shortcomings like ghosts and discontinuities if a suitable choice of expansion parameters is performed.

scholarly journals Inherently stable effective field theory for dark energy and modified gravity

2019 ◽  
Vol 2019 (01) ◽  
pp. 041-041 ◽  
Author(s):  
Lucas Lombriser ◽  
Charles Dalang ◽  
Joe Kennedy ◽  
Andy Taylor
Keyword(s):  
Field Theory ◽  
Dark Energy ◽  
Effective Field Theory ◽  
Modified Gravity ◽  
Effective Field

scholarly journals Prospects for primordial gravitational waves in string inflation

2016 ◽  
Vol 25 (12) ◽  
pp. 1644011 ◽  
Author(s):  
Susha L. Parameswaran ◽  
Ivonne Zavala
Keyword(s):  
Field Theory ◽  
String Theory ◽  
Gravitational Waves ◽  
Effective Field Theory ◽  
Effective Field ◽  
Moduli Stabilization ◽  
Slow Roll ◽  
Primordial Gravitational Waves ◽  
Difficult Challenge ◽  
String Models

Assuming that the early universe had (i) a description using perturbative string theory and its field theory limit, (ii) an epoch of slow-roll inflation within a four-dimensional effective field theory and a hierarchy of scales [Formula: see text] that keeps the latter under control, we derive an upper bound on the amplitude of primordial gravitational waves. The bound is very sensitive to mild changes in numerical coefficients and the expansion parameters. For example, allowing couplings and mass-squared hierarchies [Formula: see text] implies [Formula: see text], but asking more safely for hierarchies [Formula: see text], the bound becomes [Formula: see text]. Moreover, large volumes — typically used in string models to keep backreaction and moduli stabilization under control — drive [Formula: see text] down. Consequently, any detection of inflationary gravitational waves would present an interesting but difficult challenge for string theory.

scholarly journals Testing Screened Modified Gravity

Universe ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 11
Author(s):  
Philippe Brax ◽  
Santiago Casas ◽  
Harry Desmond ◽  
Benjamin Elder
Keyword(s):  
Field Theory ◽  
Solar System ◽  
Long Range ◽  
Effective Field Theory ◽  
Modified Gravity ◽  
Scalar Fields ◽  
Short Review ◽  
Effective Field ◽  
Point Of View ◽  
Theory Point

Long range scalar fields with a coupling to matter appear to violate known bounds on gravitation in the solar system and the laboratory. This is evaded thanks to screening mechanisms. In this short review, we shall present the various screening mechanisms from an effective field theory point of view. We then investigate how they can and will be tested in the laboratory and on astrophysical and cosmological scales.

Sign in / Sign up

Export Citation Format

Share Document