@misc{oai:ir.soken.ac.jp:00000702,
 author = {古永家, 忠之 and コナガヤ, タダユキ and KONAGAYA, Tadayuki},
 month = {2016-02-17, 2016-02-17},
 note = {There are some peculiar phenomena in non-commutative field theories.　One is<br />the planer limit that nonplaner diagrams arising from non-commutativity of space-<br />time disappear in the maximal non-commmutativity. We send the parameter <i>&theta;</i> which<br />presents the non-commutativity to &infin;.　The other is the UV/IR mixing that ultra-<br />violet divergences in the commutative case change into infrared divergences due to<br />non-commutative parameter <i>&theta;</i>.　Then, we study whether nonplaner diagrams disap-<br />pear,when we fix <i>&theta;</i> and take the external momentum <i>p</i> → &infin; limit instead.　We<br />perform explicit two loop calculation to confirm the above limit by using perturbation<br />theory.　And, we calculate the effective action of non-commutative gauge theories to see<br />infrared singular terms due to UV/IR mixing. We discuss the meaning of the terms<br />from the point of view of instability in the system., application/pdf, 総研大甲第946号},
 title = {Dynamics of Quantum Field Theories on Noncommutative Space-time},
 year = {}
}