Stochastic gravitational waves induce 1-loop freeze-in production of fermionic dark matter via in-in formalism, potentially explaining the observed abundance more efficiently than conventional mechanisms.
Cosmic strings
7 Pith papers cite this work. Polarity classification is still indexing.
7
Pith papers citing it
abstract
The topic of cosmic strings provides a bridge between the physics of the very small and the very large. They are predicted by some unified theories of particle interactions. If they exist, they may help to explain some of the largest-scale structures seen in the Universe today. They are `topological defects' that may have been formed at phase transitions in the very early history of the Universe, analogous to those found in some condensed-matter systems --- vortex lines in liquid helium, flux tubes in type-II superconductors, or disclination lines in liquid crystals. In this review, we describe what they are, why they have been hypothesized and what their cosmological implications would be. The relevant background from the standard models of particle physics and cosmology is described in section 1. In section 2, we review the idea of symmetry breaking in field theories, and show how the defects formed are constrained by the topology of the manifold of degenerate vacuum states. We also discuss the different types of cosmic strings that can appear in different field theories. Section 3 is devoted to the dynamics of cosmic strings, and section 4 to their interaction with other fields. The formation and evolution of cosmic strings in the early Universe is the subject of section 5, while section 6 deals with their observational implications. Finally, the present status of the theory is reviewed in section 7.
citation-role summary
background 2
citation-polarity summary
roles
background 2polarities
background 2representative citing papers
Metastable cosmic strings produce a gravitational wave background that is best modeled with three parameters (string tension Gμ plus independent time scales t_LB and t_NC), yielding a compact analytical spectrum when t_LB greatly exceeds t_NC.
Numerical simulations of Z_3 and Z_4 domain-wall collisions show vortex-antivortex creation mediating mergers in SU(3) and energy-dependent outcomes in SU(4), establishing a dynamical role for topological strings.
In gauged U(1) completions enabling high-quality axion dark matter, cosmic string loops generate a stochastic gravitational wave background with an infrared break frequency that exceeds foregrounds above 10^14 GeV breaking scales and offers a probe at interferometers.
Vacuum of a charged scalar in a (D+1)-dimensional cosmic dispiration with magnetic flux induces both azimuthal and axial currents, the latter from helical torsion, with closed massive/massless expressions that reduce to the pure-string case.
Constrains inflationary tensor parameters to fit the EPTA DR2 signal under CMB, BBN and LVK bounds, favoring radiation-era horizon re-entry but requiring low reheating temperatures.
Time-dependent holographic entanglement entropy and complexity are computed perturbatively for braneworld FLRW universes with radiation, matter, and exotic matter by using time-dependent brane positions in black brane bulk geometries.
citing papers explorer
-
Gravitational Wave-Induced Freeze-In of Fermionic Dark Matter
Stochastic gravitational waves induce 1-loop freeze-in production of fermionic dark matter via in-in formalism, potentially explaining the observed abundance more efficiently than conventional mechanisms.
-
New gravitational-wave templates for metastable cosmic strings: Loop breaking versus network collapse
Metastable cosmic strings produce a gravitational wave background that is best modeled with three parameters (string tension Gμ plus independent time scales t_LB and t_NC), yielding a compact analytical spectrum when t_LB greatly exceeds t_NC.
-
Dynamics of ($Z_N$) Domain Walls in SU(N) Gauge Theories
Numerical simulations of Z_3 and Z_4 domain-wall collisions show vortex-antivortex creation mediating mergers in SU(3) and energy-dependent outcomes in SU(4), establishing a dynamical role for topological strings.
-
High-Quality Axion Dark Matter at Gravitational Wave Interferometers
In gauged U(1) completions enabling high-quality axion dark matter, cosmic string loops generate a stochastic gravitational wave background with an infrared break frequency that exceeds foregrounds above 10^14 GeV breaking scales and offers a probe at interferometers.
-
Vacuum-induced current density from a magnetic flux threading a cosmic dispiration in $(D+1)$-dimensional spacetime
Vacuum of a charged scalar in a (D+1)-dimensional cosmic dispiration with magnetic flux induces both azimuthal and axial currents, the latter from helical torsion, with closed massive/massless expressions that reduce to the pure-string case.
-
Inflationary interpretation of the gravitational-wave signal in the European Pulsar Timing Array DR2 with constraints
Constrains inflationary tensor parameters to fit the EPTA DR2 signal under CMB, BBN and LVK bounds, favoring radiation-era horizon re-entry but requiring low reheating temperatures.
-
Holographic entanglement entropy and complexity for the cosmological braneworld model
Time-dependent holographic entanglement entropy and complexity are computed perturbatively for braneworld FLRW universes with radiation, matter, and exotic matter by using time-dependent brane positions in black brane bulk geometries.