167 citations · 1.9k across the 38 of their papers we have counts for
33 papers · 1 filter
Deformations of Starobinsky Inflation in No-Scale SU(5) and SO(10) GUTs
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +2
The original Starobinsky model of inflation is consistent with Planck and other measurements of the CMB, but recent results from the ACT and SPT Collaborations hint that…
Bare mass effects on the reheating process after inflation
Simon Clery, Marcos A. G. Garcia, Yann Mambrini +1
We consider the effects of a bare mass term for the inflaton, when the inflationary potential takes the form about its minimum with . We concentrate on ,…
The Role of Vectors in Reheating
Marcos A. G. Garcia, Kunio Kaneta, Wenqi Ke +3
We explore various aspects concerning the role of vector bosons during the reheating process. Generally, reheating occurs during the period of oscillations of the inflaton condensa…
Effects of Fragmentation on Post-Inflationary Reheating
Marcos A. G. Garcia, Mathieu Gross, Yann Mambrini +3
We consider the effects of fragmentation on the post-inflationary epoch of reheating. In simple single field models of inflation, an inflaton condensate undergoes an oscillatory ph…
Reheating after Inflaton Fragmentation
Marcos A. G. Garcia, Mathias Pierre
In the presence of self-interactions, the post-inflationary evolution of the inflaton field is driven into the non-linear regime by the resonant growth of its fluctuations. The onc…
A New Window into Gravitationally Produced Scalar Dark Matter
Marcos A. G. Garcia, Mathias Pierre, Sarunas Verner
Conventional scenarios of purely gravitationally produced dark matter with masses below the Hubble parameter at the end of inflation are in tension with Cosmic Microwave Background…
Isocurvature Constraints on Scalar Dark Matter Production from the Inflaton
Marcos A. G. Garcia, Mathias Pierre, Sarunas Verner
We investigate the production of a spectator scalar dark matter field that is directly coupled to the inflaton during inflation and reheating. We consider two specific inflationary…
Scalar Dark Matter Production from Preheating and Structure Formation Constraints
Marcos A. G. Garcia, Mathias Pierre, Sarunas Verner
We investigate the out-of-equilibrium production of scalar dark matter (DM) from the inflaton condensate during inflation and reheating. We assume that this scalar couples only to…
BICEP/Keck Constraints on Attractor Models of Inflation and Reheating
John Ellis, Marcos A. G. Garcia, Dimitri V. Nanopoulos +2
Recent BICEP/Keck data on the cosmic microwave background, in combination with previous WMAP and Planck data, impose strong new constraints on the tilt in the scalar perturbation s…
Freeze-in from Preheating
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini +2
We consider the production of dark matter during the process of reheating after inflation. The relic density of dark matter from freeze-in depends on both the energy density and en…
On the Realization of WIMPflation
Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive +1
We consider models for inflation with a stable inflaton. Reheating is achieved through scattering processes such as , where is the Standard Model Higgs boson. We con…
Inflaton Oscillations and Post-Inflationary Reheating
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini +1
We analyze in detail the perturbative decay of the inflaton oscillating about a generic form of its potential , taking into account the effects of non-instantaneous reh…
Reheating and Dark Matter Production
Marcos A. G. Garcia
A concise summary of out-of-equilibrium dark matter production during post-inflationary reheating is presented. We show that the dark matter relic abundance is in general sensitive…
How warm are non-thermal relics? Lyman- bounds on out-of-equilibrium dark matter
Guillermo Ballesteros, Marcos A. G. Garcia, Mathias Pierre
We investigate the power spectrum of Non-Cold Dark Matter (NCDM) produced in a state out of thermal equilibrium. We consider dark matter production from the decay of scalar condens…
Building Models of Inflation in No-Scale Supergravity
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +3
After reviewing the motivations for cosmological inflation formulated in the formalism of supersymmetry, we argue that the appropriate framework is that of no-scale supergravity. W…
The case for decaying spin-3/2 dark matter
Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive +1
We couple a sterile neutrino sector to a spin-3/2 particle and show that with a Planck reduced coupling, we can obtain a sufficiently long lifetime making the spin-3/2 particle a g…
Reheating and Post-inflationary Production of Dark Matter
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini +1
We perform a systematic analysis of dark matter production during post-inflationary reheating. Following the period of exponential expansion, the inflaton begins a period of damped…
Proton Decay: Flipped vs Unflipped SU(5)
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +2
We analyze nucleon decay modes in a no-scale supersymmetric flipped SU(5) GUT model, and contrast them with the predictions for proton decays via dimension-6 operators in a standar…
Superstring-Inspired Particle Cosmology: Inflation, Neutrino Masses, Leptogenesis, Dark Matter & the SUSY Scale
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +2
We develop a string-inspired model for particle cosmology, based on a flipped SU(5)U(1) gauge group formulated in a no-scale supergravity framework. The model realizes Star…
Cosmology with a Master Coupling in Flipped SU(5) U(1): The Universe
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +2
We propose a complete cosmological scenario based on a flipped SU(5) U(1) GUT model that incorporates Starobinsky-like inflation, taking the subsequent cosmological evolut…
Symmetry Breaking and Reheating after Inflation in No-Scale Flipped SU(5)
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +2
No-scale supergravity and the flipped SU(5)U(1) gauge group provide an ambitious prototype string-inspired scenario for physics below the string scale, which can accommodat…
Prethermalization Production of Dark Matter
Marcos A. G. Garcia, Mustafa A. Amin
At the end of inflation, the inflaton field decays into an initially nonthermal population of relativistic particles which eventually thermalize. We consider the production of dark…
Enhancement of the Dark Matter Abundance Before Reheating: Applications to Gravitino Dark Matter
Marcos A. G. Garcia, Yann Mambrini, Keith A. Olive +1
In the first stages of inflationary reheating, the temperature of the radiation produced by inflaton decays is typically higher than the commonly defined reheating temperature $T_{…
Starobinsky-like Inflation, Supercosmology and Neutrino Masses in No-Scale Flipped SU(5)
John Ellis, Marcos A. G. Garcia, Natsumi Nagata +2
We embed a flipped GUT model in a no-scale supergravity framework, and discuss its predictions for cosmic microwave background observables, which ar…