Zobrazeno 1 - 10
of 158
pro vyhledávání: '"Zapata, Óscar"'
We investigate the implications of memory burden on the gravitational wave (GW) spectrum arising from the Hawking evaporation of light primordial black holes (PBHs). By considering both rotating (Kerr) and non-rotating (Schwarzschild) PBHs, we demons
Externí odkaz:
http://arxiv.org/abs/2409.05953
In one-component dark matter (DM) scenarios is commonly assumed that a scalar WIMP must either be part of an $SU(2)_L$ multiplet with zero hypercharge or have suppressed vector interactions with the $Z$ gauge boson to circumvent stringent direct dete
Externí odkaz:
http://arxiv.org/abs/2406.01729
We explore the possibility of explaining the observed dark matter (DM) relic abundance, along with matter-antimatter asymmetry, entirely from the evaporation of primordial black holes (PBH) beyond the semi-classical approximation. We find that, depen
Externí odkaz:
http://arxiv.org/abs/2405.15858
QCD-like theories in which the dark matter (DM) of the Universe is hypothesized to be a thermal relic in the form of a dark pion has been extensively investigated, with most studies neglecting the CP-violating $\theta$-angle associated with the topol
Externí odkaz:
http://arxiv.org/abs/2405.10367
In this talk, based on arXiv:2301.11345, arXiv:2305.16388, arXiv:2311.12694, we discuss the production of primordial gravitational waves (GW) sourced by graviton bremsstrahlung during inflationary reheating. For reheating, we consider inflaton decays
Externí odkaz:
http://arxiv.org/abs/2405.09620
Autor:
Yaguna, Carlos E., Zapata, Óscar
We propose a new and compact realization of singlet Dirac dark matter within the WIMP framework. Our model replaces the standard $Z_2$ stabilizing symmetry with a $Z_6$, and uses spontaneous symmetry breaking to generate the dark matter mass, resulti
Externí odkaz:
http://arxiv.org/abs/2401.13101
We built an extended 2HDM theory with a spontaneously broken $U(1) _{X}$ global symmetry, where the tree level Universal Seesaw Mechanism generates the mass hierarchy of the Standard Model charged fermions and the Zee-Babu mechanism produces tiny act
Externí odkaz:
http://arxiv.org/abs/2308.10946
Autor:
Yaguna, Carlos E., Zapata, Óscar
We investigate a simple extension of the standard model (SM) in which the dark matter consists of a feebly interacting fermion (FIMP), charged under a new $Z_4$ symmetry, that is produced in the early Universe by the freeze-in mechanism. The only oth
Externí odkaz:
http://arxiv.org/abs/2308.05249
We discuss the production of primordial gravitational waves (GW) from radiative inflaton decay during the period of reheating, assuming perturbative decay of the inflaton either into a pair of bosons or fermions, leading to successful reheating satis
Externí odkaz:
http://arxiv.org/abs/2305.16388
We revisit graviton production via Bremsstrahlung from the decay of the inflaton during inflationary reheating. Using two complementary computational techniques, we first show that such 3-body differential decay rates differ from previously reported
Externí odkaz:
http://arxiv.org/abs/2301.11345